20-F

As filed with the Securities and Exchange Commission on April 30, 2019

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 20-F

☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

    For the fiscal year ended December 31, 2018

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

OR

☐ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

    Date of event requiring this shell company report                                         

    For the transition period from                      to                     

Commission file number 1-14926

KT Corporation

(Exact name of Registrant as specified in its charter)

KT Corporation	The Republic of Korea
(Translation of Registrant’s name into English)	(Jurisdiction of incorporation or organization)

KT Gwanghwamun Building East

33, Jong-ro 3-Gil, Jongno-gu

03155 Seoul, Korea

(Address of principal executive offices)

Kyung-Keun Yoon

KT Gwanghwamun Building East

33, Jong-ro 3-Gil, Jongno-gu

03155 Seoul, Korea

Telephone: +82-31-727-0114; E-mail: kk.yoon@kt.com; ktir@kt.com

(Name, telephone, e-mail and/or facsimile number and address of company contact person)

Securities registered or to be registered pursuant to Section 12(b) of the Act.

Title of each class	Name of each exchange on which registered
American Depositary Shares, each representing	New York Stock Exchange, Inc.
one-half of one share of ordinary share
Ordinary share, par value ￦5,000 per share*	New York Stock Exchange, Inc.*

Securities registered or to be registered pursuant to Section 12(g) of the Act.

None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act.

None

As of December 31, 2018, there were 245,144,768 ordinary shares, par value ￦5,000 per share, outstanding

(not including 15,967,040 ordinary shares held by the registrant as treasury shares)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☒    No  ☐

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.    Yes  ☐     No  ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒     No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer  ☒    Accelerated filer  ☐    Non-accelerated filer  ☐    Emerging growth company  ☐

If an emerging growth company that prepares its financial statements in accordance with U.S. GAAP, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing. U.S. GAAP  ☐    IFRS  ☒    Other  ☐

If “Other” has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.    Item 17  ☐    Item 18   ☐

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

* Not for trading, but only in connection with the registration of the American Depositary Shares.

TABLE OF CONTENTS

Part I			1
Item 1.	Identity of Directors, Senior Managers and Advisers		1
	Item 1.A.	Directors and Senior Management	1
	Item 1.B.	Advisers	1
	Item 1.C.	Auditors	1
Item 2.	Offer Statistics and Expected Timetable		1
	Item 2.A.	Offer Statistics	1
	Item 2.B.	Method and Expected Timetable	1
Item 3.	Key Information		2
	Item 3.A.	Selected Financial Data	2
	Item 3.B.	Capitalization and Indebtedness	5
	Item 3.C.	Reasons for the Offer and Use of Proceeds	5
	Item 3.D.	Risk Factors	5
Item 4.	Information on the Company		23
	Item 4.A.	History and Development of the Company	23
	Item 4.B.	Business Overview	24
	Item 4.C.	Organizational Structure	45
	Item 4.D.	Property, Plant and Equipment	45
Item 4A.	Unresolved Staff Comments		47
Item 5.	Operating and Financial Review and Prospects		47
	Item 5.A.	Operating Results	47
	Item 5.B.	Liquidity and Capital Resources	71
	Item 5.C.	Research and Development, Patents and Licenses, Etc.	74
	Item 5.D.	Trend Information	74
	Item 5.E.	Off-balance Sheet Arrangements	74
	Item 5.F.	Tabular Disclosure of Contractual Obligations	75
	Item 5.G.	Safe Harbor	75
Item 6.	Directors, Senior Management and Employees		75
	Item 6.A.	Directors and Senior Management	75
	Item 6.B.	Compensation	80
	Item 6.C.	Board Practices	81
	Item 6.D.	Employees	83
	Item 6.E.	Share Ownership	84

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Item 7.	Major Shareholders and Related Party Transactions		86
	Item 7.A.	Major Shareholders	86
	Item 7.B.	Related Party Transactions	86
	Item 7.C.	Interests of Experts and Counsel	86
Item 8.	Financial Information		86
	Item 8.A.	Consolidated Statements and Other Financial Information	86
	Item 8.B.	Significant Changes	88
Item 9.	The Offer and Listing		89
	Item 9.A.	Offer and Listing Details	89
	Item 9.B.	Plan of Distribution	89
	Item 9.C.	Markets	89
	Item 9.D.	Selling Shareholders	89
	Item 9.E.	Dilution	89
	Item 9.F.	Expenses of the Issuer	89
Item 10.	Additional Information		89
	Item 10.A.	Share Capital	89
	Item 10.B.	Memorandum and Articles of Association	89
	Item 10.C.	Material Contracts	96
	Item 10.D.	Exchange Controls	96
	Item 10.E.	Taxation	100
	Item 10.F.	Dividends and Paying Agents	107
	Item 10.G.	Statements by Experts	108
	Item 10.H.	Documents on Display	108
	Item 10.I.	Subsidiary Information	108
Item 11.	Quantitative and Qualitative Disclosures About Market Risk		108
Item 12.	Description of Securities Other than Equity Securities		111
	Item 12.A.	Debt Securities	111
	Item 12.B.	Warrants and Rights	111
	Item 12.C.	Other Securities	111
	Item 12.D.	American Depositary Shares	111
Part II			113
Item 13.	Defaults, Dividend Arrearages and Delinquencies		113
Item 14.	Material Modifications to the Rights of Security Holders and Use of Proceeds		113
Item 15.	Controls and Procedures		113

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Item 16.	[Reserved]	114
Item 16A.	Audit Committee Financial Expert	114
Item 16B.	Code of Ethics	114
Item 16C.	Principal Accountant Fees and Services	115
Item 16D.	Exemptions from the Listing Standards for Audit Committees	115
Item 16E.	Purchases of Equity Securities by the Issuer and Affiliated Purchasers	116
Item 16F.	Change in Registrant’s Certifying Accountant	116
Item 16G.	Corporate Governance	116
Item 16H.	Mine Safety Disclosure	117
Part III		118
Item 17.	Financial Statements	118
Item 18.	Financial Statements	118
Item 19.	Exhibits	118

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PRESENTATION

All references to “Korea” or the “Republic” contained in this annual report mean the Republic of Korea. All references to the “Government” are to the government of the Republic of Korea. All references to “we,” “us” or the “Company” are to KT Corporation and, as the context may require, its subsidiaries.

All references to “Won” or “￦” in this annual report are to the currency of the Republic and all references to “Dollars,” “$,” “US$” or “U.S. dollars” are to the currency of the United States of America. Our monetary assets and liabilities denominated in foreign currency are translated into Won at the market average exchange rate announced by Seoul Money Brokerage Services, Ltd. (the “Market Average Exchange Rate”) on the balance sheet dates, which were, for U.S. dollars, ￦1,208.5 to US$1.00, ￦1,071.4 to US$1.00 and ￦1,118.1 to US$1.00 on December 31, 2016, 2017 and 2018, respectively. Our consolidated financial statements are expressed in Won and, solely for the convenience of the reader, the consolidated financial statements as of and for the year ended December 31, 2018 have been translated into United States dollars at the rate of ￦1,118.1 to US$1.00, the Market Average Exchange Rate in effect on December 31, 2018.

Any discrepancies in any table between totals and the sums of the amounts listed are due to rounding.

All market share data contained in this annual report, unless otherwise specified, are based on the number of subscribers announced by the Ministry of Science and ICT (the “MSIT”), the Korea Communications Commission (the “KCC”) or the Korea Telecommunications Operators Association.

PART  I

Item 1.  Identity of Directors, Senior Managers and Advisers

Item 1.A.  Directors and Senior Management

Not applicable.

Item 1.B.  Advisers

Not applicable.

Item 1.C.  Auditors

Not applicable.

Item 2.  Offer Statistics and Expected Timetable

Item 2.A.  Offer Statistics

Not applicable.

Item 2.B.  Method and Expected Timetable

Not applicable.

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Item 3.  Key Information

Item 3.A.  Selected Financial Data

The selected financial data presented below should be read in conjunction with our consolidated financial statements as of January 1, 2017 and December 31, 2017 and 2018 and for each of the years in the three-year period ended December 31, 2018 and related notes thereto (“Consolidated Financial Statements”) and “Item 5. Operating and Financial Review and Prospects” included elsewhere in this annual report. The selected financial data as of December 31, 2017 and 2018 and for each of the years in the three year period ended December 31, 2018 were derived from our audited Consolidated Financial Statements included elsewhere in this annual report. Our Consolidated Financial Statements are prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

In addition to preparing financial statements in accordance with IFRS as issued by the IASB included in this annual report, we prepare financial statements in accordance with IFRS as adopted by the Republic of Korea (“K-IFRS”), which we are required to file with the Financial Services Commission and the Korea Exchange under the Financial Investment Services and Capital Markets Act of Korea (“FSCMA”). English translations of such financial statements are furnished to the Securities and Exchange Commission under Form 6-K. See “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results—Explanatory Note Regarding Presentation of Certain Financial Information under K-IFRS.”

The information set forth below is not necessarily indicative of the results of future operations and should be read in conjunction with “Item 5. Operating and Financial Review and Prospects” and our Consolidated Financial Statements and related notes included in this annual report.

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Selected consolidated statement of operations data

	Year Ended December 31,
	2014			2015			2016			2017			2018
	(In billions of Won, except per share data)
Continuing Operations:
Operating revenue	￦	22,619		￦	22,715		￦	23,164		￦	23,547		￦	23,436
Revenue		22,366			22,227			22,798			23,260			23,220
Others		253			488			366			287			216
Operating expenses		23,392			21,623			21,781			22,478			22,335
Operating profit		(773	)		1,092			1,383			1,069			1,101
Finance income		253			273			296			406			374
Finance costs		(792	)		(645	)		(515	)		(645	)		(436	)
Income from jointly controlled entities and associates		19			6			3			(14	)		(5	)
Profit (loss) from continuing operations before income tax		(1,293	)		726			1,167			817			1,034
Income tax expense (benefit)		(270	)		231			335			271			315
Profit (loss) for the year from the continuing operations		(1,023	)		495			832			546			719
Discontinued operations:
Profit (loss) from discontinued operations		86			141			—			—			—
Profit (loss) for the year	￦	(937	)	￦	636		￦	832		￦	546		￦	719
Profit (loss) for the year attributable to:
Equity holders of the parent company	￦	(1,026	)	￦	557		￦	745		￦	462		￦	645
Profit (loss) from continuing operations		(1,090	)		415			745			462			645
Profit (loss) from discontinued operations		64			142			—			—			—
Non-controlling interest	￦	89		￦	79		￦	87		￦	85		￦	74
Profit from continuing operations		66			80			87			85			74
Profit (loss) from discontinued operations		22			(1	)		—			—			—
Earnings per share attributable to the equity holders of the Parent Company during the period:
Basic earnings (loss) per share	￦	(4,194	)	￦	2,275		￦	3,043		￦	1,884		￦	2,634
From continuing operations		(4,456	)		1,694			3,043			1,884			2,634
From discontinued operations		262			581			—			—			—
Diluted earnings (loss) per share	￦	(4,194	)	￦	2,275		￦	3,041		￦	1,883		￦	2,634
From continuing operations		(4,456	)		1,694			3,041			1,883			2,634
From discontinued operations		262			581			—			—			—

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Selected consolidated statement of financial position data

	As of December 31,
Selected Statement of Financial Position Data	2014			2015			2016			2017			2018
	(In billions of Won)
Assets:
Current assets:
Cash and cash equivalents	￦	1,889		￦	2,559		￦	2,900		￦	1,928		￦	2,703
Trade and other receivables, net		5,871			4,960			5,478			5,965			5,680
Other financial assets		333			293			721			973			995
Current income tax assets		4			4			2			9			4
Inventories, net		419			617			455			642			1,075
Current assets held for sale		—			—			—			7			13
Other current assets		351			318			311			305			1,688
Total current assets		8,867			8,751			9,866			9,829			12,158
Non-current assets:
Trade and other receivables, net		1,759			704			709			829			843
Other financial assets		705			658			665			755			623
Property and equipment, net		16,468			14,479			14,312			13,562			13,068
Investment property, net		1,060			1,102			1,148			1,190			1,091
Intangible assets, net		3,544			2,600			3,023			2,633			3,407
Investments in jointly controlled entities and associates		339			270			284			279			272
Deferred income tax assets		1,077			840			701			712			465
Other non-current assets		73			103			106			107			546
Total non-current assets		25,025			20,756			20,948			20,067			20,315
Total assets	￦	33,892		￦	29,507		￦	30,815		￦	29,896		￦	32,474
Liabilities and Equity:
Current liabilities:
Trade and other payables	￦	6,431		￦	6,337		￦	7,142		￦	7,426		￦	7,008
Borrowings		2,956			1,726			1,820			1,573			1,368
Other financial liabilities		24			44			0			37			1
Current income tax liabilities		48			83			103			83			250
Provisions		111			104			96			78			118
Deferred income		144			98			36			18			53
Other current liabilities		279			311			342			259			597
Total current liabilities		9,993			8,703			9,539			9,474			9,394
Non-current liabilities:
Trade and other payables		944			669			1,188			1,001			1,514
Borrowings		9,860			6,909			6,301			5,110			5,280
Other financial liabilities		191			104			108			149			163
Retirement benefit liabilities		594			524			378			395			561
Provisions		106			91			101			125			164
Deferred income		147			96			85			92			111
Deferred income tax liabilities		144			130			138			128			205
Other non-current liabilities		39			27			59			237			424
Total non-current liabilities		12,025			8,550			8,358			7,238			8,422
Total liabilities	￦	22,018		￦	17,253		￦	17,898		￦	16,712		￦	17,816
Equity attributable to owners of the Parent Company:
Paid-in capital
Share capital	￦	1,564		￦	1,564		￦	1,564		￦	1,564		￦	1,564
Share premium		1,440			1,440			1,440			1,440			1,440
Retained earnings		8,568			9,147			9,779			9,961			11,256
Accumulated other comprehensive income (expense)		112			14			(1	)		31			50
Other components of equity		(1,261	)		(1,233	)		(1,218	)		(1,205	)		(1,181	)
Total equity attributable to owners of the parent company		10,425			10,934			11,564			11,792			13,130
Non-controlling interest		1,449			1,320			1,353			1,392			1,529
Total equity		11,874			12,254			12,917			13,183			14,658
Total liabilities and equity	￦	33,892		￦	29,507		￦	30,815		￦	29,896		￦	32,474

4

Selected consolidated statement of cash flow data

	Year Ended December 31,
	2014			2015			2016			2017			2018
	(In billions of Won)
Net cash generated from operating activities	￦	1,916		￦	4,230		￦	4,771		￦	3,878		￦	4,010
Net cash used in investing activities		(3,171	)		(2,402	)		(3,485	)		(3,483	)		(2,704	)
Net cash provided by (used in) financing activities		1,072			(1,164	)		(943	)		(1,363	)		(532	)

Operating Data

	As of December 31,
	2014		2015		2016		2017		2018
Lines installed (thousands) (1)		23,930		23,607		24,858		24,343		23,660
Lines in service (thousands) (1)		13,713		12,440		11,871		11,220		10,655
Lines in service per 100 inhabitants (1)		26.7		24.6		23.0		21.7		20.6
Mobile subscribers (thousands)		17,300		18,038		18,892		20,015		21,120
Broadband Internet subscribers (thousands)		8,129		8,328		8,516		8,758		8,729

(1) Including public telephones.

Item 3.B.  Capitalization and Indebtedness

Not applicable.

Item 3.C.  Reasons for the Offer and Use of Proceeds

Not applicable.

Item 3.D.  Risk Factors

You should carefully consider the following factors.

Risks Relating to Our Business

Competition in each of our principal business areas is intense.

We face significant competition in each of our principal business areas. In the markets for mobile services, fixed-line services and media and content services, we compete primarily with SK Telecom Co., Ltd. (“SK Telecom”) and LG Uplus Corp. (“LG U+”) (including their affiliates). In the past two decades, considerable consolidation in the telecommunications industry has occurred, resulting in the current competitive landscape comprising three network service providers that offer a wide range of telecommunications and data communications services. In early 2019, each of our primary competitors announced plans to acquire a leading cable TV operator in Korea to significantly increase their market shares in the pay TV market, which we expect will further intensify competition. In January 2019, LG U+ announced its plan to acquire a controlling interest in CJ HelloVision Co., Ltd. (“CJ HelloVision”). In February 2019, SK Telecom announced its plan to merge with t-broad Co., Ltd. (“t-broad”). To a lesser extent, we also compete with various value-added service providers and specific service providers as classified under the Framework Act on Telecommunications and the Telecommunications Business Act, including mobile virtual network operators (“MVNOs”) that lease mobile networks and offer mobile services, VoIP service providers that offer Internet telephone services, cable TV operators, text messaging service providers (particularly Kakao Corp. (“Kakao”)) and voice resellers, many of which offer competing services at lower prices. The entrance of new service providers in the markets for mobile services, fixed-line services and media and content services may further increase competition, as well as cause downward price pressure on the fees we

5

charge for our services. For a discussion of our market shares in key markets, please see “Item 4. Information on the Company—Item 4.B. Business Overview—Competition.”

We compete primarily based on our service performance, quality and reliability, ability to accurately identify and respond to evolving consumer demand, and pricing. With the launch of the next generation 5G mobile services in April 2019, we expect competition to further intensify among the three network service providers, which may result in an increase in marketing expenses, as well as additional capital expenditures related to implementing 5G mobile services. Mobile service providers also grant subsidies or subscription discount rates to subscribers who purchase new handsets and agree to a minimum subscription period and we compete also based on such amounts. We and SK Telecom have been designated as market-dominating business entities in the local telephone and mobile markets, respectively, under the Telecommunications Business Act. Under this Act, a market-dominating business entity may not engage in any act of abuse, such as unreasonably interfering with business activities of other business entities, hindering unfairly the entry of newcomers or substantially restricting competition to the detriment of the interests of consumers. In addition, changes in our local telephone rates and mobile rates of SK Telecom require prior approval from the MSIT. The KCC has also issued guidelines on fair competition of the telecommunications companies.

In the financial services market, our credit and check cards issued under the “BC Card” brand pursuant to co-brand agreements with member companies compete principally with cards issued by other leading credit card companies in Korea with their own merchant payment networks, such as Shinhan Card, Hyundai Card and Samsung Card. Our member companies that issue co-branded credit or check cards include Woori Card, NH Card, Industrial Bank of Korea and KB Kookmin Card. We also compete with service providers that provide outsourcing services related to business operations of credit card companies. Competition in the credit card and check card businesses has increased substantially as existing credit card companies, consumer finance companies and other financial institutions in Korea have made significant investments and engaged in aggressive marketing campaigns and promotions for their credit and check cards, as well as investing in operational infrastructure that may reduce the need for our outsourcing services.

Our inability to adapt to changes in the competitive landscape and compete against our competitors in our principal business areas could have a material adverse effect on our business, financial condition and results of operations.

Failure to renew existing bandwidth licenses, acquire adequate additional bandwidth licenses or use our bandwidth efficiently may adversely affect our mobile telecommunications business and results of operations.

One of the principal limitations on a wireless network’s subscriber capacity is the amount of bandwidth allocated to a service provider. We have acquired a number of licenses to secure bandwidth capacity to provide our broad range of services, for which we typically make an initial payment as well as pay usage fees during the license period. We made bandwidth license payments of ￦416 billion in 2016, ￦271 billion in 2017 and ￦573 billion in 2018. For our outstanding payment obligations relating to our bandwidth licenses as of December 31, 2018, see “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results—Overview—Acquisition of New Bandwidth Licenses and Usage Fees.” For more information on our bandwidth licenses, see “ Item 4. Information on the Company—Item 4.D. Property, Plant and Equipment—Mobile Networks.”

The growth of our mobile telecommunications business and the increase in usage of wireless data transmission services have significantly increased the utilization of our bandwidth, because

6

wireless data applications are generally more bandwidth-intensive than voice services. The current trend of increasing data transmission use and the increasing sophistication of multimedia contents are likely to put additional strain on the bandwidth capacity of mobile service providers. In the event we are unable to maintain sufficient bandwidth capacity by renewing existing bandwidth licenses, receiving additional bandwidth allocation or cost-effectively implementing technologies that enhance the efficiency of our bandwidth usage, our subscribers may perceive a general decrease in the quality of mobile telecommunications services. No assurance can be given that bandwidth constraints will not adversely affect the growth of our mobile telecommunications business. Furthermore, we may be required to make substantial payments to acquire additional bandwidth capacity in order to meet increasing bandwidth demand, which may adversely affect our business, financial condition and results of operations.

Introduction of new services, including our 5G mobile services launched in April 2019, poses challenges and risks to us.

The telecommunications industry is characterized by continual advances and improvements in telecommunications technology, and we have been continually researching and implementing technology upgrades and additional telecommunications services to maintain our competitiveness. For example, we have been building more advanced mobile telecommunications networks based on 5G technology and commenced providing commercial 5G mobile services with transmission speed of up to 1 Gbps in April 2019 in the Seoul metropolitan area, six additional metropolitan cities, high-traffic commercial areas and university campuses as well as major transportation infrastructure such as highways, railways and airports. We plan to gradually expand the coverage nationwide and increase the transmission speed of our 5G services thereafter. As we continue to compete with SK Telecom and LG U+ to improve network quality, introduce new services and accommodate increased data usage of subscribers, we may incur significant expenses to acquire additional bandwidth licenses and incur significant capital expenditures to build out and improve our network. We have made extensive efforts to develop advanced technologies as well as provide a variety of services with enhanced speed, latency and connectivity. Furthermore, we are also continually upgrading our broadband network to enable better fiber-to-the-home (“FTTH”) connection, which enhances data transmission speed and connection quality. FTTH is a telecommunication architecture in which a communication path is provided over optical fiber cable extending from the telecommunications operator’s switching equipment to homes or offices. FTTH uses fiber optic cable, which is able to carry a high-bandwidth signal for longer distances without degradation. FTTH enables us to deliver enhanced services that require high bandwidth with stability, such as IPTV and other digital media and content services.

No assurance can be given that our new services will gain broad market acceptance such that we will be able to derive revenue from such services to justify the license fees, capital expenditures and other investments required to provide such services. For example, we discontinued our wireless broadband Internet access (“WiBro”) services in the fourth quarter of 2018, following a steady decrease in its subscriber base in recent years reflecting an increase in popularity of 4G LTE services. If our new services do not gain broad market acceptance, our business, financial condition and results of operations may be adversely affected.

We may not be able to successfully pursue our strategy to acquire businesses and enter into joint ventures that complement or diversify our current business, and we may need to incur additional debt to finance such expansion activities.

One key aspect of our overall business strategy calls for acquisitions of businesses and entering into joint ventures that complement or diversify our current businesses. For example, we have pursued investment opportunities in the financial sector in the past decade that we believe provide attractive growth opportunities. In October 2011, we acquired a controlling interest in BC Card Co., Ltd.

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(“BC Card”), a leading credit card solutions provider in Korea in which we hold a 69.54% interest. We also acquired 10.00% of the common shares of K Bank Inc. (“K Bank”), an Internet-only bank that began its commercial operations in April 2017, which interest is accounted for using the equity method of accounting.

While we plan to continue our search for other suitable acquisition and joint venture opportunities, we cannot provide assurance that we will be able to identify additional attractive opportunities or that we will successfully complete the transactions without encountering administrative, technical, political, financial or other difficulties, or at all. Even if we were to successfully complete the transactions, the success of an acquisition or a joint venture depends largely on our ability to achieve the anticipated synergies, cost savings and growth opportunities from integrating the business of the acquired company or the joint venture with our current businesses. There can be no assurance that we will achieve the anticipated benefits of the transaction, which may adversely affect our business, financial condition and results of operations. Pursuing acquisitions or joint venture transactions also requires significant capital, and as we pursue further growth opportunities for the future, we may need to raise additional capital through incurring loans or through issuances of bonds or other securities in the international capital markets.

The Korean telecommunications and Internet-related industries are subject to extensive Government regulations, and changes in Government policy relating to these industries could have a material adverse effect on our operations and financial condition.

The Government, primarily through the MSIT and the KCC, has the authority to regulate the telecommunications industry in Korea. The MSIT and the KCC also have the authority to regulate the pay TV industry under the Korea Broadcasting Act, which covers our IPTV services as well as our satellite TV services provided through KT Skylife Co., Ltd. (“KT Skylife”), in which we own a 49.99% interest. See “Item 4. Information on the Company—Item 4.B. Business Overview—Regulation.” The MSIT’s policy is to promote competition through measures designed to prevent the dominant service provider in any such market from exercising its market power in a way that would prevent the emergence and development of viable competitors. Under such regulations, if a network service provider has the largest market share for a specified type of telecommunications service and its revenue from that service for the previous year exceeds a specific revenue amount set by the MSIT, such entity may be designated as a market-dominating business entity that may not engage in any act of abuse, such as unreasonably interfering with business activities of other business entities, hindering unfairly the entry of newcomers or substantially restricting competition to the detriment of the interests of consumers. Furthermore, under the Internet Multimedia Broadcasting Services Act, an IPTV service provider, together with its affiliates providing IPTV services, is restricted from having more than one-third of the market share of all paid broadcasting subscribers in Korea (consisting of IPTV, cable TV and satellite TV subscribers). As of December 31, 2018, KT Skylife and we together had an aggregate market share of 31.2% of all paid broadcasting subscribers in Korea. The KCC has also issued guidelines on fair competition of telecommunications and Internet-related companies. In addition, the Government sets the policies regarding the use of radio frequency bandwidths and allocates the bandwidths used for wireless telecommunications by an auction process or by a planned allocation.

We and SK Telecom have been designated as market-dominating business entities in the local telephone and mobile markets, respectively, and the MSIT, in consultation with the Ministry of Economy and Finance (“MOEF”), currently approves rates charged by us and SK Telecom for such services. The form of our standard agreement for providing local network services and each agreement for interconnection with other service providers must also be reported to the MSIT. Although we compete freely with other network service providers in terms of rate plans for our principal telecommunications and Internet-related services except for rates we charge for local calls, our inability

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to freely set our local telephone service rates may hurt profits from such businesses and impede our ability to compete effectively against our competitors. In addition, the MSIT may periodically announce policy guidelines that we may be recommended to take into consideration in our telecommunications and Internet-related businesses. In recent years, the MSIT has announced policy guidelines with the objectives of reducing mobile service rates and promoting transparency in the decision making of telecommunications service providers. Specific policy guidelines include monthly rate reductions applicable to certain low-income subscribers as well as subscription rate discounts in lieu of handset subsidies. Starting in December 2017, we began providing rate discounts of up to ￦11,000 per month to our low-income mobile subscribers on government welfare programs. We also increased the maximum discount rate applicable to mobile subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017. Such discounts have contributed to a decrease in the average monthly revenue per subscriber of our mobile services from ￦34,444 in 2017 to ￦32,021 in 2018.

The Government may pursue additional measures to regulate the markets in which we compete. For example, according to a proposed amendment to the Telecommunications Business Act, which is currently pending at the National Assembly, the market-dominating mobile network service provider (SK Telecom) is required to provide a “universal” mobile subscription plan at a significant discount to the rates currently available. The current proposal contemplates that the plan be priced at ￦20,000 per month (including value added tax (“VAT”)) for up to 200 call minutes and data usage of 1 GB. If adopted as proposed, we may offer similar rate plans to compete more effectively with SK Telecom. There can be no assurance that we will not adopt additional measures that reduce rates charged to our subscribers as well as adjustments to our handset subsidies and other measures in the future to comply with regulatory requirements or the Government’s policy guidelines.

The MSIT may revoke our licenses or suspend any of our businesses if we fail to comply with its rules, regulations and corrective orders, including the rules restricting beneficial ownership and control or any violation of the conditions of our licenses. Alternatively, in lieu of suspension of our business, the MSIT may levy a monetary penalty of up to 3.0% of the average of our annual revenue for the preceding three fiscal years. From time to time, we have been imposed fines for violation of regulations imposed by MSIT and KCC, including an imposition of a fine of ￦12.5 billion in January 2018 by the KCC for violation of regulations relating to handset sales. There is no guarantee that the laws and regulations to which we are or become subject will not have a material adverse effect on our business, financial condition or results of operations.

The legal cases against Mr. Suk-chae Lee, a former chief executive officer, and other former executive officers or directors—and related adverse publicity—could have a material adverse effect on our business, reputation and stock price.

In April 2014, the Seoul Central District prosecutor’s office charged Mr. Suk-chae Lee, a former chief executive officer who resigned in November 2013, with embezzlement and breach of fiduciary duty. Mr. Il Yung Kim, a former standing director and former president of the KT Corporate Center, was charged as a co-conspirator in the breach of fiduciary duty by Mr. Lee, and Mr. Yu-yeol Seo, a former president of Home Business Group, was charged as a co-conspirator in Mr. Lee’s embezzlement. On September 24, 2015, the Seoul District Court acquitted Mr. Lee of the charges of embezzlement and breach of fiduciary duty. Mr. Kim and Mr. Seo were also acquitted of the conspiracy charges. The prosecution appealed the judgments and on May 27, 2016, the Seoul High Court found Mr. Lee and Mr. Seo guilty of embezzlement and sentenced them to 18 months of prison term, to be suspended for two years, for having embezzled and created off-the-books funds of ￦1.1 billion between 2009 and 2013, using such funds for personal purposes such as payments at weddings and funerals of Mr. Lee’s friends and acquaintances and Mr. Seo’s living and entertainment expenses. However, Mr. Lee and Mr. Kim were acquitted on the charge of breach of fiduciary duty. These judgments have been

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appealed by the prosecution as well as by Mr. Lee and Mr. Seo to the Supreme Court of Korea, which, on May 30, 2017, confirmed the acquittal of Mr. Lee and Mr. Kim on the charge of breach of fiduciary duty, and vacated the appellate judgment against Mr. Lee and Mr. Seo on the charge of embezzlement and remanded the case back to the Seoul High Court. On April 26, 2018, the Seoul High Court acquitted Mr. Lee and Mr. Seo on the charge of embezzlement.

The legal cases against Mr. Lee, Mr. Seo, and Mr. Kim do not involve charges of wrongdoing by us. Nevertheless, an adverse determination in any such case or proceeding may harm our reputation and adversely affect the trading price of our shares. The outcome of any related claims, investigations and proceedings is inherently uncertain and there can be no assurance that any further developments in the legal proceedings against Mr. Lee, Mr. Seo, and Mr. Kim, including adverse publicity, will not adversely affect our business, reputation or stock price.

Our charitable or political donations, employment of certain individuals and engagement of an advertising agency connected to a scandal involving Ms. Soon-sil Choi, a confidante of former President Geun-hye Park, and other incidents and allegations could have a material adverse effect on our business, reputation and stock price.

In March 2017, the Constitutional Court of Korea found that many Korean corporations, including us, made donations to two non-profit foundations, Mir Foundation and K-Sports Foundation, at former President Park’s request. Our contributions comprised ￦1.1 billion of the total ￦48.6 billion given to Mir Foundation and ￦700 million of the total ￦28.8 billion given to K-Sports Foundation. The Constitutional Court also found that an aide of former President Park, at the direction of the former President, on several occasions asked our chief executive officer to hire (and later to promote) two individuals, Mr. Dong-Soo Lee and Ms. Hye-Sung Shin. Mr. Lee was hired and later promoted to the head of a business unit in charge of our marketing and advertisement campaigns and Ms. Shin was hired to another position in the same business unit. Subsequently, the same presidential aide also requested that Mr. Lee and our other officers award advertising contracts to Playground Communications Co., Ltd. (“Playground”), an advertising agency over which Ms. Soon-sil Choi, a confidante of former President Park, effectively owns 70% equity interest, according to the Constitutional Court. The Constitutional Court further held that the companies receiving the purported “requests” from former President Park’s aide appeared to have felt immense pressure to comply with the requests and could not easily have rejected them. Playground was awarded seven advertising contracts for a total of approximately ￦6.8 billion in 2016, amounting to approximately 3.7% of our annual advertising spending in 2016. In 2016, our payments to Playground amounted to approximately ￦517 million. We have not awarded additional advertising contracts to Playground since September 2016, and Mr. Lee and Ms. Shin resigned in November 2016 and May 2016, respectively.

In April 2017, the Korean prosecution indicted former President Park on charges of bribery, coercion and abuse of power, among others. On August 24, 2018, the Seoul High Court sentenced the former President to a prison term of 25 years and a monetary fine of ￦20 billion, having found the former President guilty on many of the charges, including the coercion charges relating to the same events underlying the Constitutional Court decisions described above: (i) the employment and promotions of Mr. Lee and Ms. Shin at KT Corporation, (ii) the entry into advertising contracts with Playground and (iii) the donations to Mir Foundation and K-Sports Foundation by us and other Korean corporations. The prosecution appealed the appellate court’s decision to the Supreme Court of Korea.

On January 18, 2018, the Korean prosecution indicted Mr. Byung-Hun Jun, a former member of the National Assembly, for charges of bribery, corruption and coercion, among others. One of the allegations was that Mr. Jun, during his term as a member of the former Science, ICT, Future Planning, Broadcasting and Communications Committee (currently the Science, ICT, Broadcasting and Communications Committee) of the National Assembly, solicited donations or financial sponsorship

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from various corporations, including us, to an organization where he used to serve as the president. In February 2019, the Seoul Central District Court found Mr. Jun guilty of the bribery charges and sentenced him to a prison term of five years and an aggregate monetary fine of ￦375 million, guilty of abuse of authority and sentenced him to a prison term of one year on probation for two years, and not guilty of the charge in connection with soliciting financial sponsorship of ￦100 million from us. Both Mr. Jun and the Korean prosecution appealed the court’s decision. While the prosecution indicted Mr. Jun for these allegations, no indictment or charges of wrongdoing were brought against us or any of our executives or employees in connection with Mr. Jun’s indictment.

In January 2018, the Korean police commenced an investigation in connection with the allegations that our current and former executives and employees violated the Political Funds Act of Korea, by making certain donations to various lawmakers using corporate funds. This matter is currently being investigated by the Prosecutors’ Office.

The Seoul Southern District Prosecutor’s Office is currently conducting an investigation on our public recruiting process in 2012. In connection with this investigation, in March and April 2019, the Prosecutor’s Office arrested two former executive officers for engaging in a number of improper hirings during the public recruiting process of college graduates in the second half of 2012. In March 2019, the KT New Labor Union filed criminal complaints with the Seoul Central District Prosecutor’s Office against our current chief executive officer, alleging charges including a criminal breach of fiduciary duty, in connection with management consulting (research and survey) contracts entered into between us and certain public officials since November 2014. The investigation by the Prosecutor’s Office is ongoing.

We cannot be certain at this time how the above-described matters and the publicity around them will develop. While we have not been indicted in connection with the above-mentioned matters, related allegations, claims, investigations and proceedings remain a possibility, and we cannot provide any assurances as to likely outcomes. There can be no assurance that any further developments relating to the above-mentioned matters, including adverse publicity, will not adversely affect our business, reputation or stock price.

Cybersecurity breaches may expose us to significant legal and financial exposure, damage to our reputation and a loss of confidence of our customers.

Our business involves the storage and transmission of large amounts of confidential information of our subscribers and cardholders, and cybersecurity breaches expose us to a risk of loss of this information, which may lead to improper use or disclosure of such information, ensuing potential liability and litigation, any of which could harm our reputation and adversely affect our business. Even though we strive to take all steps we believe are necessary to protect personal information, hardware, software or applications we develop or procure from third parties may contain defects or other problems that could unexpectedly compromise information security. Unauthorized parties may also attempt to circumvent our security measures to gain access to our systems or facilities through fraud, trickery or other forms of deceiving our employees, contractors and temporary staff. In addition, because the techniques used to obtain unauthorized access or sabotage systems change frequently and may be difficult to detect for long periods of time, we may be unable to anticipate these techniques or implement adequate preventive measures.

In the past, we have experienced cyber-attacks of varying degrees from time to time, including theft of personal information of our subscribers by third parties that have led to lawsuits and administrative actions against us alleging that the leak was caused by our poor management of subscribers’ personal information. For example, in July 2012, the police arrested two third-party individuals in connection with the alleged theft of personal information relating to approximately

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8.7 million of our mobile phone subscribers. The individuals in question stole personal information through a series of hackings into our mobile customer information system starting from February 2012. Furthermore, in March 2014, the police arrested three third-party individuals in connection with their alleged theft of personal information relating to approximately 9.8 million of our subscribers. The individuals in question stole the personal information of our subscribers through a series of hackings into our main homepage starting from February 2014. If we experience additional significant cybersecurity breaches or fail to detect and appropriately respond to significant cybersecurity breaches, we could be subject to additional government enforcement actions, regulatory sanctions and litigation in the future. In addition, our subscribers and cardholders could lose confidence in our ability to protect their personal information, which could cause them to discontinue using our services altogether. Furthermore, adverse final determinations, decisions or resolutions regarding such matters could encourage other parties to bring related claims and actions against us. Accordingly, our failure to prevent cybersecurity breaches may materially and adversely impact our business, financial condition and results of operations.

Our business and performance may be harmed by a disruption in our services due to failures in or changes to our systems, or by our failure to timely and effectively expand and upgrade our technology and infrastructure.

Our reputation and ability to attract, retain, and serve our subscribers, cardholders and other business partners are dependent in large part upon the reliable performance of our services and the underlying technical infrastructure. Our telecommunications network systems and information technology systems may not be adequately designed with the necessary reliability and redundancy to avoid performance delays or outages that could be harmful to our business. We have experienced, and may in the future experience, service disruptions, outages and other performance problems due to a variety of factors, including infrastructure changes, human or software errors, hardware failures, capacity constraints due to an overwhelming number of people accessing our services simultaneously, computer viruses, power losses, fraud and security attacks. Our technical infrastructure is also vulnerable to the risk of damage from natural and other disasters, such as fires, earthquakes, floods, and typhoons, as well as from acts of terrorism and other criminal acts. For example, in November 2018, a fire broke out at one of our facilities located in the Ahyeon district of western Seoul, which temporarily disrupted our wireless, fixed-line and IPTV services in seven districts covered by the facility. We restored most of our services within four days and our fixed-line public switched telephone network (“PSTN”) services within 11 days, and we refunded subscription fees ranging from one to six months as compensation to our affected subscribers. In addition, we are accepting applications from small business owners for financial assistance, which we plan to provide as appropriate to assist in their recovery from the incident.

As the number of our subscribers and cardholders increases and as our customers access, download and transmit increasing volumes of media contents as well as engage in increasing volumes of financial transactions, we may be required to expand and upgrade our technology and infrastructure to continue to reliably deliver our telecommunications, Internet-related and financial services. We cannot provide assurance that we will be able to expand and upgrade our technology and infrastructure to meet user demand in a timely manner, or on favorable economic terms. We purchase telecommunications network equipment from a limited number of key suppliers, and any discontinuation or interruption in the availability of equipment from our key suppliers for any reason could have an adverse effect on our operations. If our users are unable to readily access our services or access is disrupted, users may seek other service providers instead, and may not return to our services or use our services as often in the future. This would negatively impact our ability to attract subscribers, cardholders and other business partners as well as increase engagement of our customers. To the extent that we do not effectively address capacity constraints, upgrade our systems as needed or continually develop our technology and infrastructure to accommodate actual and

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anticipated changes in our customers’ needs, our business, financial condition and results of operations may be harmed.

Our intellectual property rights are valuable, and our inability to protect them could reduce the value of our products, services and brands.

Our trade secrets, trademarks, copyrights, patents and other intellectual property rights are important assets for us. We rely on, and expect to continue to rely on, a combination of confidentiality and license agreements with our employees, consultants and third parties with whom we have relationships, as well as trademark, trade dress, domain name, copyright, trade secret and patent laws, to protect our brands and other intellectual property rights. However, various events outside of our control may pose a threat to our intellectual property rights, as well as to our products, services and technologies. For example, we may fail to obtain effective intellectual property protection, or effective intellectual property protection may not be available, in every country in which our services are available. Also, the efforts we have taken to protect our intellectual property rights may not be sufficient or effective, and any of our intellectual property rights may be challenged, which could result in them being narrowed in scope or declared invalid or unenforceable. There can be no assurance that our intellectual property rights will be sufficient to protect against others offering services that are substantially similar to ours and compete with our business.

We also rely on non-patented proprietary information and technology, such as trade secrets, confidential information, know-how and technical information. While in certain cases we have agreements in place with employees and third parties that place restrictions on the use and disclosure of such intellectual property, these agreements may be breached, or such intellectual property may otherwise be disclosed or become known to our competitors, which could cause us to lose competitive advantages resulting from such intellectual property.

We are also pursuing registration of trademarks and domain names in Korea and in select jurisdictions outside of Korea. Effective protection of trademarks, domain names and other intellectual property is expensive and difficult to maintain, both in terms of application and registration costs as well as the costs of defending and enforcing those rights.

We also seek to obtain patent protection for some of our technology, and we have filed various applications in Korea and elsewhere for protection of certain aspects of our intellectual property and currently hold a number of issued patents in multiple jurisdictions. We may be unable to obtain patent or trademark protection for our technologies and brands, and our existing patents and trademarks, and any patents or trademarks that may be issued in the future, may not provide us with competitive advantages or distinguish our products and services from those of our competitors. In addition, any patents and trademarks may be contested, circumvented, or found unenforceable or invalid, and we may not be able to prevent third parties from infringing, diluting or otherwise violating them. Significant infringements of our intellectual property rights, and limitations on our ability to assert our intellectual property rights against others, could harm our ability to compete and our business, financial condition and results of operations could be adversely affected.

We may become party to intellectual property rights claims in the future that may be expensive and time consuming to defend, and such claims, if resolved adversely, could have a significant impact on our business.

Telecommunications and information technology companies own large numbers of patents, copyrights, trademarks, licenses and trade secrets, and frequently enter into litigation based on allegations of infringement, misappropriation or other violations of intellectual property or other rights. In addition, various “non-practicing entities” that own intellectual property rights often attempt to

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aggressively assert claims in order to extract payments from companies like us. From time to time, we have received, and may receive in the future, claims from third parties which allege that we have infringed upon their intellectual property rights. Furthermore, from time to time, we may introduce or acquire new services or content, including in areas where we currently do not compete, which could increase our exposure to intellectual property claims from competitors and non-practicing entities.

As we face increasing competition, the number and scope of intellectual property claims against us may grow. There may be intellectual property or other rights held by others, including issued or pending patents, that cover significant aspects of our services, and we cannot be certain that we are not infringing or violating, and have not infringed or violated, any third-party intellectual property rights or that we will not be held to have done so or be accused of doing so in the future. Any claim or litigation alleging that we have infringed or otherwise violated intellectual property or other rights of third parties, with or without merit, and whether or not settled out of court or determined in our favor, could be time consuming and costly to address and resolve, and could divert the time and attention of our management and technical personnel. The outcome of any litigation is inherently uncertain, and there can be no assurance that favorable final outcomes will be obtained. In addition, plaintiffs may seek, and we may become subject to, preliminary or provisional rulings in the course of any such litigation, including potential preliminary injunctions requiring us to cease some or all of our operations.

If any litigation to which we are a party is resolved adversely, we may be subject to an unfavorable judgment that may not be reversed upon appeal. The terms of any such judgment or any settlement may require us to cease some or all of our operations, pay substantial amounts to the other party or seek licensing arrangements. If we are required or choose to enter into royalty or licensing arrangements, such arrangements may not be available on commercially reasonable terms, or at all. In addition, the development or procurement of alternative technology could require significant effort and expense or may not be feasible. Accordingly, an unfavorable resolution of any intellectual property rights claims could adversely affect our business, financial condition and results of operations.

We rely on key researchers and engineers and senior management, and the loss of the services of any such key personnel or the inability to attract and retain replacements may negatively affect our business.

Our success depends to a significant extent upon the continued service of our research and development and engineering personnel, and on our ability to continue to attract, retain and motivate qualified researchers and engineers. In particular, our focus on leading the market in introducing new telecommunications and Internet-related services has meant that we must aggressively recruit engineers with expertise in cutting-edge technologies. In addition, our ability to execute our strategy effectively is dependent upon contributions from our key senior management. Our future success will depend on the continued service of our key executive officers and managers who possess significant expertise and knowledge of our industry. A limited number of individuals have primary responsibility for the management of our business, including our relationships with key business partners. From time to time, there may be changes in our senior management team that may be disruptive to our business, and we may not be able to find replacement key personnel in a timely manner. Any loss or interruption of the services of these individuals, whether from retirement, loss to competitors or other causes, or failure to attract and retain other qualified new personnel, could prevent us from effectively executing our business strategy, cause us to lose key business relationships, or otherwise materially affect our operations.

Government regulation of the credit card industry may adversely affect the operations of BC Card in which we hold a 69.54% interest.

Due to the rapid growth of the credit card market and rising consumer debt levels in Korea, the Government has heightened its regulatory oversight of the credit card industry in recent decades. In

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particular, the FSC and the Financial Supervisory Service (“FSS”) have adopted a variety of regulations governing the credit card industry. Among other things, these regulations impose minimum capital adequacy ratios, minimum required provisioning levels applicable to credit card receivables and stringent lending ratios. The FSC and FSS also impose rules governing the evaluation and reporting of credit card balances, procedures governing which persons may receive credit cards as well as processing fees paid by merchants. For example, the FSC and FSS announce periodic guidelines every three years for processing fees paid by merchants for credit card and check card transactions. In November 2018, the FSC and FSS announced guidelines reducing credit card processing fees paid by merchants with annual revenue between ￦500 million to ￦50 billion from a range of 2.05% to 2.17% to a revised range of 1.4% to 1.95%. In addition, the guidelines reduced check card processing fees paid by merchants with annual revenue exceeding ￦500 million from a range of 1.56% to 1.60% to a revised range of 1.10% to 1.45%. BC card implemented such reductions in February 2019.

Pursuant to the FSS’s capital adequacy guidelines, which are derived from standards established by the Bank for International Settlements, credit card companies in Korea are required to maintain a total capital adequacy ratio of at least 8.0% on a consolidated basis. To the extent a credit card company fails to maintain such ratio, Korean regulatory authorities may impose penalties on such company ranging from a warning to a suspension or revocation of its license. BC Card’s capital adequacy ratios were 27.1% as of December 31, 2017 and 29.3% as of December 31, 2018. Such capital adequacy ratio will decrease if the growth in BC Card’s asset base is not matched by corresponding growth in its regulatory capital. In addition, BC Card’s capital base and its capital adequacy ratio may decrease if its results of operations or financial condition deteriorates. Accordingly, there can be no assurance that BC Card will not be required to obtain additional capital in the future in order to maintain its capital adequacy ratio above the minimum required levels. There can be no assurance that, if BC Card requires additional capital in the future, it will be able to obtain such capital on favorable terms or at all, which could have a material adverse effect on the business, financial condition and results of operations of BC Card.

The Government may adopt further regulatory changes in the future that affect the credit card industry. Depending on their nature, such changes may adversely affect the operations of BC Card, by restricting its growth or scope, subjecting it to stricter requirements and potential sanctions or greater competition, constraining its profitability or otherwise.

Disputes with our labor union may disrupt our business operations.

In the past, we have experienced opposition from our labor union for our strategy of restructuring to improve our efficiency and profitability by disposing of non-core businesses and reducing our employee base. Although we have not experienced any significant labor disputes or unrests in recent years, there can be no assurance that we will not experience labor disputes or unrests in the future, including extended protests and strikes, which could disrupt our business operations and have an adverse effect on our financial condition and results of operations.

We also negotiate collective bargaining agreements every two years with our labor union and annually negotiate a wage agreement. Our current collective bargaining agreement expires on October 9, 2019. Although we have been able to reach collective bargaining agreements and wage agreements with our labor union in recent years, there can be no assurance that we will not experience labor disputes and unrest resulting from disagreements with the labor union in the future.

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We are subject to various laws and regulations in Korea and other jurisdictions, including the Monopoly Regulation and Fair Trade Act of Korea and other laws and regulations governing our business activities and acts of our management and employees.

Our business operations and acts of our management, employees and other relevant parties are subject to various laws and regulations in and outside Korea. These laws are complicated and sometimes conflicting and our efforts to comply with these laws could increase our cost of doing business, restrict our business activities and expose us or our employees to legal sanctions and liabilities.

The Monopoly Regulation and Fair Trade Act provides for various regulations and restrictions on large business groups enforced by the Korea Fair Trade Commission to prohibit or restrict actions that impede competition and fair trade. The Korea Fair Trade Commission designated us as a large business group under the Monopoly Regulation and Fair Trade Act on April 1, 2002. Our business relationships and transactions with our subsidiaries, affiliates and other companies within the KT group are subject to ongoing scrutiny by the Fair Trade Commission as to, among other things, whether such relationships and transactions constitute undue financial support among companies of the same business group. We are also subject to the fair trade regulations limiting debt guarantees for other domestic member companies of the same group and cross-shareholdings among domestic member companies of the same group, as well as requiring disclosure of the status of such cross-shareholdings. Additionally, we are subject to a prohibition, in effect since July 25, 2014, against circular shareholding among any three or more entities within our business group. Any future determination by the Korea Fair Trade Commission that we have engaged in transactions that violate the fair trade laws and regulations may result in fines or other punitive measures and may have a material adverse effect on our reputation and our business.

Certain of our business activities or acts of our management, employees or other relevant parties, including, without limitation, investigations, claims or legal proceedings involving our former chief executive officer Mr. Lee and incidents relating to the employment of certain executives and execution of certain advertising contracts described above, may raise concerns about compliance with laws of Korea and other relevant jurisdictions, including the United States. These various and sometimes conflicting laws and regulations include the U.S. Foreign Corrupt Practices Act and other laws prohibiting corrupt payments to governmental officials and commercial counterparties. Failure to comply with these laws and regulations could also result in fines, penalties and criminal sanctions against us, our officers, or our employees, prohibitions on conduct of our business, and damage to our reputation. Criminal or civil investigation by Korean or other authorities may have a material impact on our business or reputation, which in turn could impact our relationships with certain of our customers and business partners, and which potentially could give rise to additional regulatory inquiries in Korea or elsewhere. Defending us against any allegations or charges of wrongdoing also could be both costly and time-consuming, and could significantly divert the efforts and resources of our management and other personnel. There can be no assurance that we or our employees and other relevant parties will always be in full compliance with these laws and regulations, or that future legal or regulatory developments applicable to us will not have an adverse impact on our business, reputation or stock price.

Concerns that radio frequency emissions may be linked to various health concerns could adversely affect our business and we could be subject to litigation relating to these health concerns.

In the past, allegations that serious health risks may result from the use of wireless telecommunications devices or other transmission equipment have adversely affected the share prices of some wireless telecommunications companies in the United States. In May 2011, the International

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Agency for Research on Cancer (“IARC”) announced that it has classified radiofrequency electromagnetic fields associated with wireless phone use as possibly carcinogenic to humans, based on an increased risk for glioma, a malignant type of brain cancer. The IARC is part of the World Health Organization that conducts research on the causes of human cancer and the mechanisms of carcinogenesis, and aims to develop scientific strategies for cancer control. We cannot assure you that such health concerns will not adversely affect our business. Several class action and personal injury lawsuits have been filed in the United States against several wireless phone manufacturers and carriers, asserting product liability, breach of warranty and other claims relating to radio transmissions to and from wireless phones. We could be subject to liability or incur significant costs defending lawsuits brought by our subscribers or other parties who claim to have been harmed by or as a result of our services. In addition, the actual or perceived risk of wireless telecommunications devices could have an adverse effect on us by reducing our number of subscribers or our usage per subscriber.

Depreciation of the value of the Won against the Dollar and other major foreign currencies may have a material adverse effect on the results of our operations and on the prices of our securities.

Substantially all of our revenues are denominated in Won. Depreciation of the Won may materially affect the results of our operations because, among other things, it causes an increase in the amount of Won required by us to make interest and principal payments on our foreign-currency-denominated debt, the costs of telecommunications equipment that we purchase from overseas sources, net settlement payments to foreign carriers and certain payments related to our derivative instruments entered into for foreign exchange risk hedging purposes. Of the ￦6,648 billion total book value of debentures and borrowings outstanding as of December 31, 2018, ￦2,392 billion was denominated in foreign currencies. Upon identification and evaluation of our currency risk exposures, we, having considered various circumstances, enter into derivative financial instruments to try to mitigate such risks. Although the impact of exchange rate fluctuations has in the past been partially mitigated by such strategies, our results of operations have historically been affected by exchange rate fluctuations, and there can be no assurance that such strategies will be sufficient to reduce or eliminate the adverse impact of such fluctuations in the future. See “—Item 3.A. Selected Financial Data—Exchange Rate Information”, “Item 5. Operating and Financial Review and Prospects—Item 5.B. Liquidity and Capital Resources” and “Item 11. Quantitative and Qualitative Disclosures About Market Risk—Exchange Rate Risk.”

Fluctuations in the exchange rate between the Won and the Dollar will also affect the Dollar equivalent of the Won price of our ordinary shares on the KRX Korea Composite Stock Price Index (“KOSPI”) Market and, as a result, will likely affect the market price of the ADSs. These fluctuations will also affect the Dollar conversion by the depositary for the American Depositary Receipts (“ADRs”) of cash dividends, if any, paid in Won on our ordinary shares represented by the ADSs.

We may be exposed to potential claims for unpaid wages and become subject to additional labor costs arising from the Supreme Court of Korea’s interpretation of ordinary wages.

Under the Labor Standards Act, an employee’s “ordinary wage” is a key legal construct used to calculate many statutory benefits and entitlements in Korea. Increasing or decreasing the amount of compensation included in employees’ ordinary wages has the effect of increasing or decreasing the amounts of various statutory entitlements that are calculated based on “ordinary wage,” such as overtime premium pay. Under guidelines previously issued by the Ministry of Employment and Labor, prior to the Supreme Court decision described below, an employee’s ordinary wage included base salary and certain fixed monthly allowances for work performed overtime during night shifts and holidays. Prior to the Supreme Court of Korea’s decision described below, companies in Korea had typically interpreted these guidelines as excluding from the scope of ordinary wages fixed bonuses that are paid other than on a monthly basis, namely on a bi-monthly, quarterly or biannual basis.

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In December 2013, the Supreme Court of Korea ruled that regular bonuses (including those that are paid other than on a monthly basis) shall be deemed ordinary wages if these bonuses are paid “regularly” and “uniformly” on a “fixed basis” notwithstanding differential amounts based on seniority. Under this decision, any collective bargaining agreement or labor-management agreement which attempts to exclude such regular bonuses from employees’ ordinary wages will be deemed void for violation of the mandatory provisions of Korean law. However, the Supreme Court of Korea further ruled that, in certain limited situations, an employee’s claim of underpayment under the expanded scope of ordinary wages for the past three years may be denied based on the principles of good faith, even if the claim is raised within the statute of limitations period. Following this Supreme Court decision, the Ministry of Employment and Labor issued a Guideline for Labor and Management on Ordinary Wages in January 2014. A bill for amendment to the Labor Standard Act, which includes a definition of “ordinary wages” as “entire money and valuables determined in advance to be provided to the employee by the employer as wages, regardless of its name, in exchange of the prescribed or total work of the employee,” is currently pending at the sub-committee level of the National Assembly.

While we currently are not subject to any claims of underpayment from our current or former employees, the Supreme Court decision may result in additional labor costs for us in the form of additional payments required under the expanded scope of ordinary wages, both those incurred during the past three years and those to be incurred in the future. Any such additional payments may have an adverse effect on our financial condition and results of operation.

Risks Relating to Korea

If economic conditions in Korea deteriorate, our current business and future growth could be materially and adversely affected.

We are incorporated in Korea, and we generate most of our operating revenue in Korea. As a result, we are subject to economic, political, legal and regulatory risks specific to Korea. The economic indicators in Korea in recent years have shown mixed signs of growth and uncertainty, and future growth of the Korean economy is subject to many factors beyond our control, including developments in the global economy. Any future deterioration of the Korean economy, as a result of unfavorable global economic conditions or otherwise, could adversely affect our business, financial condition and results of operations and the market price of our ADSs.

Developments that could have an adverse impact on Korea’s economy include:

• declines in consumer confidence and a slowdown in consumer spending;

• deterioration in economic or diplomatic relations between Korea and its trading partners or allies, including deterioration resulting from territorial or trade disputes or disagreements in foreign policy (such as the controversy between Korea and China regarding the deployment of a Terminal High Altitude Area Defense system in Korea by the United States and the economic and other retaliatory measures imposed by China against Korea in 2017);

• adverse conditions in the economies of countries and regions that are important export markets for Korea, such as China, the United States, Europe and Japan, or in emerging market economies in Asia or elsewhere, as well as increased uncertainties regarding a future Brexit, including the possibility of additional countries exiting from the European Union;

• decreases in the market prices of Korean real estate;

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• adverse changes or volatility in foreign currency reserve levels, commodity prices (including oil prices), exchange rates (including fluctuation of the U.S. dollar, the Euro or the Japanese Yen exchange rates or revaluation of the Chinese Renminbi), interest rates, inflation rates or stock markets;

• increased sovereign default risk in select countries and the resulting adverse effects on the global financial markets;

• investigations of large Korean business groups and their senior management for possible misconduct;

• a continuing rise in the level of household debt and increasing delinquencies and credit defaults by retail and small- and medium-sized enterprise borrowers in Korea;

• social and labor unrest;

• the economic impact of any pending or future free trade agreements or changes in existing free trade agreements;

• a decrease in tax revenue or a substantial increase in the Government’s expenditures for fiscal stimulus measures, unemployment compensation and other economic and social programs that would lead to an increased government budget deficit;

• financial problems or lack of progress in the restructuring of Korean business groups, other large troubled companies (including those in the shipbuilding and shipping sectors), their suppliers or the financial sector;

• loss of investor confidence arising from corporate accounting irregularities or corporate governance issues at certain Korean companies;

• increases in social expenditures to support an aging population in Korea or decreases in economic productivity due to the declining population size in Korea;

• geo-political uncertainty and the risk of further attacks by terrorist groups around the world;

• the occurrence of severe health epidemics in Korea or other parts of the world (such as the Middle East Respiratory Syndrome outbreak in Korea in 2015);

• natural or man-made disasters that have a significant adverse economic or other impact on Korea or its major trading partners;

• political uncertainty or increasing strife among or within political parties in Korea;

• increase in the statutory minimum wage in Korea, to the extent its benefits (such as an increase in consumer confidence or spending level of employees earning the minimum wage) are outweighed by its costs (such as an increase in unemployment rate);

• hostilities or political or social tensions involving oil producing countries in the Middle East and North Africa and any material disruption in the global supply of oil or sudden increase in the price of oil;

• increased reliance on exports to service foreign currency debts, which could cause friction with Korea’s trading partners;

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• the continued growth of the Chinese economy, to the extent its benefits (such as increased exports to China) are outweighed by its costs (such as competition in export markets or for foreign investment and the relocation of the manufacturing base from Korea to China);

• political or social tensions involving Russia and any resulting adverse effects on the global supply of oil or the global financial markets; and

• an increase in the level of tensions or an outbreak of hostilities between North Korea and Korea or the United States.

Escalations in tensions with North Korea could have an adverse effect on us and the market value of our ADSs.

Relations between Korea and North Korea have been tense throughout Korea’s modern history. The level of tension between the two Koreas has fluctuated and may increase abruptly as a result of current and future events. In particular, there have been heightened security concerns in recent years stemming from North Korea’s nuclear weapon and ballistic missile programs as well as its hostile military actions against Korea. Some of the significant incidents in recent years include the following:

• North Korea renounced its obligations under the Nuclear Non-Proliferation Treaty in January 2003 and has conducted six rounds of nuclear tests since October 2006, including claimed detonations of hydrogen bombs, which are more powerful than plutonium bombs, and warheads that can be mounted on ballistic missiles. Over the years, North Korea has also conducted a series of ballistic missile tests, including missiles launched from submarines and intercontinental ballistic missiles that it claims can reach the United States mainland. In response, the Government has repeatedly condemned the provocations and flagrant violations of relevant United Nations Security Council resolutions. In February 2016, the Government also closed the inter-Korea Gaesong Industrial Complex (in which we provided certain telecommunications services prior to its closure) in response to North Korea’s fourth nuclear test in January 2016. Internationally, the United Nations Security Council has passed a series of resolutions condemning North Korea’s actions and significantly expanding the scope of sanctions applicable to North Korea, most recently in December 2017 in response to North Korea’s intercontinental ballistic missile test in November 2017. Over the years, the United States and the European Union have also expanded their sanctions applicable to North Korea.

• In March 2010, a Korean naval vessel was destroyed by an underwater explosion, killing many of the crewmen on board. The Government formally accused North Korea of causing the sinking, while North Korea denied responsibility. Moreover, in November 2010, North Korea fired more than one hundred artillery shells that hit Korea’s Yeonpyeong Island near the Northern Limit Line, which acts as the de facto maritime boundary between Korea and North Korea on the west coast of the Korean peninsula, causing casualties and significant property damage. The Government condemned North Korea for the attack and vowed stern retaliation should there be further provocation.

North Korea’s economy also faces severe challenges, which may further aggravate social and political pressures within North Korea.

Although bilateral summit meetings were held between Korea and North Korea in April, May and September 2018 and between the United States and North Korea in June 2018 and February 2019, there can be no assurance that the level of tensions affecting the Korean peninsula will not

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escalate in the future. Any increase in tensions, which may occur, for example, if North Korea experiences a leadership crisis, high-level contacts between Korea or the United States and North Korea break down or further military hostilities occur, could have a material adverse effect on the Korean economy and on our business, financial condition and results of operations.

Korea’s legislation allowing class action suits related to securities transactions may expose us to additional litigation risk.

The Securities-related Class Action Act of Korea enacted in January 2004 allows class action suits to be brought by shareholders of companies (including us) listed on the KRX KOSPI Market for losses incurred in connection with purchases and sales of securities and other securities transactions arising from (1) false or inaccurate statements provided in the registration statements, prospectuses, business reports, audit reports, semi-annual or quarterly reports and material fact reports and omission of material information in such documents, (2) insider trading, (3) market manipulation and (4) unfair trading. This law permits 50 or more shareholders who collectively hold 0.01% of the shares of a company to bring a class action suit against, among others, the issuer and its directors and officers. Because of the relatively recent enactment of the act, there is not enough judicial precedent to predict how the courts will apply the law. Litigation can be time-consuming and expensive to resolve, and can divert management time and attention from business operation. We are not aware of any basis upon which such suit may be brought against us, nor are any such suits pending or threatened. Any such litigation brought against us could have a material adverse effect on our business, financial condition and results of operations.

We are generally subject to Korean corporate governance and disclosure standards, which differ in significant respects from those in other countries.

Companies in Korea, including us, are subject to corporate governance standards applicable to Korean public companies which differ in some respects from standards applicable in other countries, including the United States. As a reporting company registered with the Securities and Exchange Commission and listed on the New York Stock Exchange, we are, and will continue to be, subject to certain corporate governance standards. However, foreign private issuers, including us, are exempt from certain corporate governance standards required under the New York Stock Exchange. For a description of significant differences in corporate governance practice compared to corporate governance standards of the New York Stock Exchange applicable to U.S. issuers, see “Item 16G. Corporate Governance.” There may also be less publicly available information about Korean companies, such as us, than is regularly made available by public or non-public companies in other countries.

Risks Relating to the Securities

If an investor surrenders his ADSs to withdraw the underlying shares, he may not be allowed to deposit the shares again to obtain ADSs.

Korean law currently limits foreign ownership of the ADSs and our shares. In addition, under our deposit agreement, the depositary bank cannot accept deposits of shares and deliver ADSs representing those shares unless (1) we have consented to such deposit or (2) Korean counsel has advised the depositary bank that the consent required under (1) is no longer required under Korean laws and regulations. Under current Korean laws and regulations, the depositary bank is required to obtain our prior consent for the number of shares to be deposited in any given proposed deposit which exceeds the difference between (1) the aggregate number of shares deposited by us or with our consent for the issuance of ADSs (including deposits in connection with the initial and all subsequent offerings of ADSs and stock dividends or other distributions related to these ADSs) and (2) the number

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of shares on deposit with the depositary bank at the time of such proposed deposit. The depositary bank has informed us that, at a time it considers to be appropriate, the depositary bank plans to start accepting deposits of shares without our consent and to deliver ADSs representing those shares up to the amount allowed under current Korean laws and regulations. Until such time, however, the depositary bank will continue to obtain our consent for such deposits of shares and delivery of ADSs, which we may not provide. Consequently, if an investor surrenders his ADSs to withdraw the underlying shares, he may not be allowed to deposit the shares again to obtain ADSs. See “Item 10. Additional Information—Item 10.D. Exchange Controls.”

A foreign investor may not be able to exercise voting rights with respect to common shares exceeding certain restrictions.

Under the Telecommunications Business Act, a foreign shareholder who holds 5.0% or more of our total shares is prohibited from becoming our largest shareholder. However, any foreign shareholder who held 5.0% or more of our total shares and was our largest shareholder on or prior to May 9, 2004 is exempt from the regulations, provided that such foreign shareholder may not acquire any more of our shares. In addition, under the Telecommunications Business Act, the MSIT may, if it deems it necessary to preserve substantial public interests, prohibit a foreign shareholder from being our largest shareholder. In the event that any foreigner or foreign government acquires our shares in violation of the above provisions, such foreign shareholder may not be able to exercise voting rights with respect to common shares exceeding such threshold. The MSIT may also order us or the foreign shareholder to take corrective measures in respect of the excess shares within a specified period of six months or less.

In addition, the Telecommunications Business Act restricts the ownership and control of network service providers by foreign shareholders. Foreigners, foreign governments and “foreign invested companies” may not own more than 49.0% of the issued shares with voting rights of a network service provider, including us. As of December 31, 2018, 48.5% of our common shares were owned by foreign investors. In the event that any foreigner or foreign government acquires our shares in violation of the above provisions, such foreign shareholder may not be able to exercise voting rights with respect to common shares exceeding such threshold. The MSIT may also order us or the foreign shareholder to take corrective measures in respect of the excess shares within a specified period of six months or less. See “Item 4. Information of the Company—Item 4.B. Business Overview—Regulation—Foreign Investment” and “Item 10. Additional Information—Item 10.B. Memorandum and Articles of Association—Limitations on Shareholding.”

Holders of ADSs will not be able to exercise appraisal rights unless they have withdrawn the underlying ordinary shares and become our direct shareholders.

In some limited circumstances, including the transfer of the whole or any significant part of our business and our merger or consolidation with another company, dissenting shareholders have the right to require us to purchase their shares under Korean law. A holder of ADSs will not be able to exercise appraisal rights unless he has withdrawn the underlying ordinary shares and become our direct shareholder. See “Item 10. Additional Information—Item 10.B. Memorandum and Articles of Association.”

An investor may not be able to exercise preemptive rights for additional shares and may suffer dilution of his equity interest in us.

The Commercial Code of Korea and our articles of incorporation require us, with some exceptions, to offer shareholders the right to subscribe for new shares in proportion to their existing ownership percentage whenever new shares are issued. If we offer any rights to subscribe for

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additional ordinary shares or any rights of any other nature, the depositary bank, after consultation with us, may make the rights available to an ADS holder or use reasonable efforts to dispose of the rights on behalf of the ADS holder and make the net proceeds available to the ADS holder. The depositary bank, however, is not required to make available to an ADS holder any rights to purchase any additional shares unless it deems that doing so is lawful and feasible and:

• a registration statement filed by us under the Securities Act of 1933, as amended, is in effect with respect to those shares; or

• the offering and sale of those shares is exempt from or is not subject to the registration requirements of the Securities Act.

We are under no obligation to file any registration statement. If a registration statement is required for an ADS holder to exercise preemptive rights but is not filed by us, the ADS holder will not be able to exercise his preemptive rights for additional shares. As a result, the ADS holder may suffer dilution of his equity interest in us.

Forward-looking statements may prove to be inaccurate.

This annual report contains “forward-looking statements” that are based on our current expectations, assumptions, estimates and projections about us and the industries in which we operate. The forward-looking statements are subject to various risks and uncertainties. These forward-looking statements include, but are not limited to, those statements using words such as “anticipate,” “believe,” “continues,” “expect,” “estimate,” “intend,” “project,” “aim,” “plan,” “likely to,” “target,” “contemplate,” “predict,” “potential” and similar expressions and future or conditional verbs such as “will,” “would,” “should,” “could,” “might,” “can,” “may,” or similar expressions generally intended to identify forward-looking statements. Those statements include, among other things, the discussions of our business strategy and expectations concerning our market position, future operations, margins, profitability, liquidity and capital resources. We caution you that reliance on any forward-looking statement involves risks and uncertainties, and that although we believe that the assumptions on which our forward-looking statements are based are reasonable, any of those assumptions could prove to be inaccurate, and, as a result, the forward-looking statements based on those assumptions could be incorrect. The uncertainties in this regard include, but are not limited to, those identified in the risk factors discussed above. In light of these and other uncertainties, you should not conclude that we will necessarily achieve any plans and objectives or projected financial results referred to in any of the forward-looking statements. We do not undertake to release the results of any revisions of these forward-looking statements to reflect future events or circumstances.

Item 4.  Information on the Company

Item 4.A.  History and Development of the Company

In 1981, the Government established us under the Korea Telecom Act to operate the telecommunications services business that it previously directly operated. Under the Korea Telecom Act and the Government-Invested Enterprises Management Basic Act, the Government exercised substantial control over our business and affairs. Effective October 1, 1997, the Korea Telecom Act was repealed and the Government-Invested Enterprises Management Basic Act became inapplicable to us. As a result, we became a corporation under the Commercial Code, and our corporate organization and shareholders’ rights were governed by the Government’s privatization laws and the Commercial Code. Among other things, we began to exercise greater autonomy in setting our annual budget and making investments in the telecommunications industry, and our shareholders began electing our directors, who had previously been appointed by the Government under the Korea Telecom Act.

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Prior to 1993, the Government owned all of the issued shares of our common stock. From 1993 through May 2002, the Government disposed of all of its equity interest in us, and the privatization laws ceased to apply to us in August 2002. We amended our legal name from Korea Telecom Corp. to KT Corporation in March 2002.

Before December 1991, we were the sole provider of local, domestic long-distance and international long-distance telephone services in Korea. The Government began to introduce competition in the telecommunications services market in the early 1990’s. As a result, including ourselves, there are currently three local telephone service providers, five domestic long-distance carriers and numerous international long-distance carriers (including voice resellers) in Korea. In addition, the Government awarded licenses to several service providers to promote competition in other telecommunications business areas such as mobile telephone services and data network services. In June 2009, KT Freetel Co., Ltd. (“KTF”), a subsidiary providing mobile telephone services, merged into KT Corporation, with KT Corporation surviving the merger, with the objective of maximizing management efficiencies of our fixed-line and mobile telecommunications operations as well as more effectively responding to the convergence trends in the telecommunications industry. See “—Item 4.B. Business Overview—Competition.”

We are a corporation with limited liability organized under the laws of Korea, and our legal and commercial name is KT Corporation. Our principal executive offices are located at KT Gwanghwamun Building East, 33, Jong-ro 3-gil, Jongno-gu, 03155, Seoul, Korea, our telephone number is +82-31-727-0114 and the address of our English website is https://corp.kt.com/eng/.

The SEC maintains a website (http://www.sec.gov), which contains reports, information statements and other information regarding issuers that file electronically with the SEC.

Item 4.B.  Business Overview

We are the leading integrated telecommunications service provider in Korea and one of the most advanced in Asia. Our principal services include:

• mobile voice and data telecommunications services based on 4G LTE and 3G W-CDMA technology, as well as 5G mobile services commercially launched in April 2019;

• fixed-line services, which include:

Ø (i) fixed-line telephone services, including local, domestic long-distance and international long-distance services, (ii) Voice over Internet Protocol (“VoIP”) telephone services (i.e., provision of communication services over the Internet, and not over the fixed-line PSTN) and (iii) interconnection services to other telecommunications companies;

Ø broadband Internet access services; and

Ø data communication services, including fixed-line and satellite leased line services and dedicated broadband Internet connection service to institutional customers;

• media and content services, including IPTV, satellite TV, TV home shopping, digital contents distribution, information and communication technology (“ICT”) platform consulting, digital music streaming and downloading and online advertising;

• credit card processing and other financial services offered primarily through BC Card;

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• various business activities that extend beyond telecommunications and financial services, including information technology and network services and satellite services as well as rental of real estate by KT Estate Inc. (“KT Estate”); and

• sale of goods, primarily sale of handsets related to our mobile services and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

Leveraging our dominant position in the fixed-line telephone services market and our established customer base in Korea, we have successfully pursued new growth opportunities and obtained strong market positions in each of our principal lines of business. In particular:

• in mobile services, we achieved a market share of 31.8% with approximately 21.1 million subscribers as of December 31, 2018;

• in fixed-line and VoIP telephone services, we had approximately 15.0 million subscribers, consisting of 11.7 million PSTN subscribers and 3.4 million VoIP subscribers as of December 31, 2018. As of such date, our market share of the fixed-line local telephone and VoIP services was 65.1%; and

• we are Korea’s largest broadband Internet access provider with approximately 8.7 million subscribers as of December 31, 2018, representing a market share of 41.0%.

For the year ended December 31, 2018, our operating revenue was ￦23,436 billion, our profit for the year was ￦724 billion and our basic earnings per share was ￦2,654. As of December 31, 2018, our total assets were ￦32,474 billion, total liabilities were ￦17,811 billion and total equity was ￦14,663 billion.

Our Services

The following table sets out our operating revenue by principal product categories and the respective percentage of total operating revenue in 2017 and 2018.

	For the Year Ended December 31,
	2017					2018
Products and services	Billions of Won		%			Billions of Won		%
Mobile services	￦	7,122		30.2	%	￦	6,828		29.1	%
Fixed-line services:
Fixed-line and VoIP telephone services		1,834		7.8			1,708		7.3
Broadband Internet access services		2,082		8.8			2,113		9.0
Data communication services		1,066		4.5			1,048		4.5
Sub-total		4,982		21.2			4,869		20.8
Media and content		2,814		12.0			3,182		13.6
Financial services		3,443		14.6			3,445		14.7
Others		1,825		7.8			1,823		7.8
Sale of goods (1)		3,361		14.3			3,289		14.0
Total operating revenue	￦	23,547		100.0	%	￦	23,436		100.0	%

(1) Primarily related to sale of handsets for our mobile service and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

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The following table sets out our operating revenue by principal product categories and the respective percentage of total operating revenue in 2016 and 2017. During such periods, we allocated our products and services into five principal product categories.

	For the Year Ended December 31,
	2016					2017
Products and services	Billions of Won		%			Billions of Won		%
	(In billions of Won)
Mobile services	￦	7,375		31.8	%	￦	7,122		30.2	%
Fixed-line services:
Fixed-line and VOIP telephone services		2,053		8.9			1,834		7.8
Internet services:
Broadband Internet access service		2,040		8.8			2,082		8.8
Other Internet-related services (1)		1,799		7.8			2,139		9.1
Data communication services		1,025		4.4			1,066		4.5
Sub-total		6,917		29.9			7,121		30.2
Financial services		3,428		14.8			3,443		14.6
Other		2,592		11.2			2,500		10.6
Sale of goods (2)		2,852		12.3			3,361		14.3
Total operating revenue	￦	23,164		100.0	%	￦	23,547		100.0	%

(1) Primarily related to revenue from IPTV services.

(2) Primarily related to sale of handsets for our mobile service and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

Mobile Services

We provide mobile services primarily based on 4G LTE and 3G W-CDMA technology. We began offering 4G LTE services in the Seoul metropolitan area in January 2012, and we completed the expansion of our coverage nationwide in October 2012. 4G LTE technology enables data to be transmitted faster than 3G W-CDMA technology, generally providing a downloading speed of approximately 50 Mbps per 10 MHz. Since our launch of 4G LTE services, we have acquired additional bandwidth licenses that have enabled us to further enhance the quality of our LTE services.

We have made extensive efforts to continually develop advanced technologies as well as to provide a variety of new mobile services with enhanced speed, latency and connectivity. We commercially launched our next generation 5G mobile services with transmission speed of up to 1 Gbps in April 2019 in the Seoul metropolitan area, six additional metropolitan cities, high-traffic commercial areas and university campuses as well as major transportation infrastructure such as highways, railways and airports. We plan to gradually expand the coverage nationwide and increase the transmission speed of our 5G services thereafter. We believe that the faster data transmission speed and lower latency of the 5G network enables us to offer significantly enhanced wireless data transmission with faster access to multimedia contents.

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Revenue related to mobile service accounted for 29.1% of our operating revenue in 2018. The following table shows selected information concerning the usage of our network during the periods indicated and the number of our mobile subscribers as of the end of such periods:

	As of or for the Year Ended December 31,
	2016		2017		2018
Average monthly revenue per subscriber (1)	￦	35,524	￦	34,444	￦	32,021
Number of mobile subscribers (in thousands)		18,892		20,015		21,120
LTE subscribers		14,262		15,462		16,971
W-CDMA subscribers		4,639		4,554		4,149

(1) The average monthly revenue per subscriber is computed by dividing total monthly fees, usage charges, interconnection fees and value-added service fees for the period by the weighted average number of subscribers (other than MVNO subscribers) and dividing the quotient by the number of months in the period.

We compete with SK Telecom, a mobile service provider that has a longer operating history than us, and LG U+ which began its service at around the same time as KTF. As of December 31, 2018, we had approximately 21.1 million subscribers, or a market share of 31.8%, which was the second largest among the three mobile service providers.

We market our mobile services primarily through independent exclusive dealers located throughout Korea. As of December 31, 2018, there were approximately 2,550 shops managed by our independent exclusive dealers. In addition to assisting new subscribers to activate mobile service and purchase handsets, authorized dealers are connected to our database and are able to assist customers with their account. Although most of these dealers sell exclusively our products and services, sub-dealers hired by exclusive dealers may sell products and services offered by other mobile telecommunications service providers. Authorized dealers are entitled to a commission for each new subscriber registered, as well as ongoing commissions for the first five years based primarily on the subscriber’s monthly fee, usage charges and length of subscription. The handsets sold by us to the dealers cannot be returned to us unless they are defective. If a handset is defective, it may be exchanged for a new one within 14 days from the date of purchase.

In response to the diversification of our customers’ demands and their increasing sophistication, we have also selectively engaged in opportunities to expand our internal sales channels in recent years. As of December 31, 2018, we operated approximately 200 customer plazas that engage in mobile service sales activities as well as provide a one-stop shop for a wide range of other services and products that we offer. We also operate a website to promote and advertise our products and services to the general public and in particular to younger customers who are more familiar with the Internet.

We conduct the screening process for new subscribers with great caution. A potential subscriber must meet all minimum credit criteria before receiving mobile service. The procedure includes checking the history of non-payment and credit information from banks and credit agencies such as the National Information and Credit Evaluation Corporation. Applicants who do not meet the minimum criteria can only subscribe to the mobile service by using a pre-paid card.

Fixed-line Services

We provide a variety of fixed-line services, including various telephone services, broadband Internet access and data communication services.

Fixed-line and VoIP Telephone Services

We utilize our extensive nationwide telephone network to provide fixed-line telephone services, which consist of local, domestic long-distance, international long-distance services and land-to-mobile

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interconnection services. Our fixed-line telephone network includes exchanges, long-distance transmission equipment and fiber optic and copper cables. We also provide VoIP telephone services that enable VoIP phone devices with broadband connection to make domestic and international calls. These fixed-line and VoIP telephone services accounted for 7.3% of our operating revenue in 2018. In recent years, the proliferation of mobile phones, as well as the availability of increasingly lower wireless pricing plans, some of which include unlimited voice minutes, has led to significant decreases in our domestic long-distance call minutes and local call pulses. The following table shows selected information concerning our fixed-line telephone network and the number of PSTN and VoIP subscribers as of the end of the periods indicated as well as their engagement levels during such periods.

	As of or for the Year Ended December 31,
	2014		2015		2016		2017		2018
Total Korean population (thousands) (1)		51,328		51,529		51,696		51,799		51,826
PSTN and VoIP lines in service (thousands)		17,259		16,682		16,266		15,610		14,992
PSTN lines in service		13,849		13,268		12,791		12,201		11,637
Local lines in service		12,948		12,409		11,869		11,222		10,654
Group lines in service		900		859		921		979		983
VoIP lines in service		3,411		3,413		3,436		3,409		3,355
Fiber optic cable (kilometers)		673,783		695,546		732,873		764,802		784,088
Domestic long-distance call minutes (millions) (2)		2,743		2,113		1,507		1,126		892
Local call pulses (millions) (2)		4,038		3,034		2,161		1,285		974

(1) Based on the number of registered residents as published by the Ministry of the Interior and Safety of Korea.

(2) Excluding calls placed from public telephones.

Our domestic long-distance cable network is entirely made up of fiber optic cable and can carry both voice and data transmissions. Compared to conventional materials such as coaxial cable, fiber optic cable provides significantly greater transmission capacity with less signal fading, thus requiring less frequent amplification. All of our lines are connected to exchanges capable of handling digital signal technology. A principal limitation of the older analog technology is that applications other than voice communications, such as the transmission of text and computer data, require either separate networks or conversion equipment. Digital systems permit a range of voice, text and data applications to be transmitted simultaneously on the same network.

Japan, China and the United States accounted for the greatest percentage of our international long-distance call traffic measured in minutes in 2018. In recent years, the volume of our incoming calls has exceeded the volume of our outgoing calls. The agreed settlement rate is applied to the call minutes to determine the applicable net settlement payment. The following table shows the number of minutes of international long-distance calls recorded by us and specific service providers utilizing our international long-distance network in each specified category for each year in the five-year period ended December 31, 2018:

	Year Ended December 31,
	2014		2015		2016		2017		2018
	(In millions of billed minutes)
Incoming international long-distance calls		549.4		390.5		352.3		286.4		221.1
Outgoing international long-distance calls		212.2		179.0		155.1		125.9		101.1
Total		761.6		569.5		507.4		412.3		322.2

Under the Telecommunications Business Act, we are required to permit other service providers to interconnect to our fixed-line network. Currently, the principal users of this interconnection capacity include affiliates of SK Telecom and LG U+ (offering local, domestic long-distance and international long-distance services, and transmitting calls to and from their mobile networks). We recognize as

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land-to-mobile interconnection revenue the entire amount of the usage charge collected from the landline user and recognize as an expense the amount of interconnection charge paid to the mobile service provider.

Broadband Internet Access Services

Leveraging on our nationwide network of 784,088 kilometers of fiber optic cables, we have achieved a leading market position in the broadband Internet access market in Korea. We believe we have a competitive advantage over other broadband Internet access service providers because, unlike our competitors, we can utilize our existing networks nationwide to provide broadband Internet access service. Our principal Internet access services are offered under the “KT Internet” and “KT GiGA Internet” brand names. We also offer WiFi services under the “KT WiFi” brand name, which is designed to integrate fixed-line and wireless services by offering high speed wireless Internet access to laptops and smartphones in hot-spot zones and KT Internet service in fixed-line environments. Our broadband Internet access services accounted for 9.0% of our operating revenue in 2018.

As of December 31, 2018, we had approximately 8.7 million broadband Internet subscribers, including approximately 4.9 million KT GiGA Internet service subscribers with enhanced data transmission speeds of up to 1.0 Gbps. In addition, we had approximately 4.0 million KT WiFi subscribers as of such date. We also sponsored approximately 107,000 hot-spot zones nationwide for wireless connection as of December 31, 2018.

Our KT Internet services primarily utilize ADSL technology, which is a technology that converts existing copper twisted-pair telephone lines into access paths for multimedia and high-speed data communications. ADSL transforms the existing public telephone network from one limited to voice, text and low-resolution graphics to a system capable of bringing multimedia to subscriber premises without new cabling. The asymmetric design optimizes the bandwidth by maximizing the downstream speed for downloading information from the Internet. We are continually upgrading our broadband network to enable better FTTH connection, which further enhances data transmission speed and connection quality. FTTH is a telecommunication architecture in which a communication path is provided over optical fiber cables extending from the telecommunications operator’s switching equipment to the boundary of home or office. FTTH uses fiber optic cable, which is able to carry a high-bandwidth signal for longer distances without degradation. FTTH enables us to deliver enhanced services that require high bandwidth, such as IPTV, and other digital media contents with higher stability.

Data Communication Services

Our data communication services involve offering exclusive lines that allow point-to-point connection for voice and data traffic between two or more geographically separate points. As of December 31, 2018, we leased 267,535 lines to domestic and international businesses. We provide dedicated and secure broadband Internet connection service to institutional customers under the “Kornet” brand name. We provide high-speed connection to our Internet backbone network, as well as rent to our customers and install necessary routers to ensure reliable Internet connection and enhanced security. We provide discount rates to qualified customers, including small- and medium-sized enterprises, businesses engaging in Internet access services and government agencies. Data communication services accounted for 4.5% of our operating revenue in 2018.

Through our wholly owned subsidiary KT Sat Co., Ltd., we also provide transponder leasing, broadcasting, video distribution and data communication services through satellites periodically launched by us. We also lease satellite capacity from other satellite operators to offer satellite services to both domestic and international customers.

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Media and Content Services

We offer a variety of media and content services, including IPTV, satellite TV, TV home shopping, digital content distribution, ICT platform consulting, digital music streaming and downloading and online advertising. Media and content services accounted for 13.6% of our operating revenue in 2018.

IPTV

We offer high definition video-on-demand and real-time broadcasting IPTV services under the brand name “olleh TV” as well as ultra-high-definition (“UHD”) IPTV services under the brand name “olleh GiGA UHD TV.” Our IPTV service offers access to an array of digital media contents, including movies, sports, news, educational programs and TV replay, for a fixed monthly fee or on a pay-per-view basis. Through a digital set-top box that we rent to our customers, our customers are able to browse the catalogue of digital media contents and view selected media streams on their television. A set-top box provides two-way communications on an IP network and decodes video streaming data. We had approximately 7.9 million IPTV subscribers as of December 31, 2018.

Satellite TV

We offer satellite TV services with features similar to our IPTV services through KT Skylife, in which we own a 49.99% interest. We had approximately 4.3 million satellite TV subscribers as of December 31, 2018.

KTH

We offer TV home shopping, digital content distribution and information and communication technology platform consulting services through KTH Co., Ltd., in which we hold a 67.10% interest. We offer a variety of consumer products and food items on our IPTV and satellite TV platforms. We also secure rights to digital entertainment contents such as movies, animations and TV series and distribute such contents to other media platforms. In addition, we provide a wide range of consulting services related to build-out of information and communication technology platforms.

Digital Music Services

We operate Genie, our platform for music contents as well as subscription-based access to online music streaming and downloading services, through our subsidiary Genie Music Corporation, in which we hold a 35.97% interest. As of December 31, 2018, Genie was the second-largest music streaming and downloading service provider in Korea in terms of number of subscribers. Genie offers a broad selection of Korean and international music, both in streaming and download formats, as well as a variety of features designed to enhance the experience of users. We offer Genie services in various formats that are specifically designed for mobile and other connected devices, PCs and TVs.

Online Advertising Consulting

We provide strategic advertising consulting services for the online advertising industry through our subsidiary Nasmedia, Co., Ltd. (“Nasmedia”), in which we hold a 42.75% interest. We provide a variety of services for advertising agencies, online media companies and their clients, ranging from market studies to advertising campaign planning as well as analysis of such campaign’s effectiveness. Our proprietary data analysis tools enable us to define specific advertising targets for the clients as well as to evaluate the effectiveness of various marketing channels to provide an optimal advertising campaign strategy.

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Financial Services

As part of our overall strategy, we selectively pursue new business opportunities in the financial sector that complement our telecommunications business. In October 2011, we acquired a controlling interest in BC Card, a leading credit card solutions provider in Korea in which we hold a 69.54% interest. We also acquired 10.00% of the common shares of K Bank, an Internet-only bank that began its commercial operations in April 2017, which interest is accounted for using the equity method of accounting. Revenue from our financial services, which consist primarily of revenue from BC Card, accounted for 14.7% of our operating revenue in 2018.

BC Card

Through BC Card, we offer various credit card processing and related financial services. We operate the largest merchant payment network in Korea as measured by transaction volume. We also provide outsourcing services to a wide range of financial institutions for their credit card and check card business operations, including production and delivery of new credit cards, the preparation of monthly statements, management of merchants and other ancillary services. In recent years, we have made efforts to expand our services in select countries in Asia, including China, Indonesia and Vietnam.

A minority interest in BC Card is owned by various financial institutions in Korea, many of which are member companies that enter into co-branding agreements with us and issue credit cards and check cards under the “BC Card” brand. Our member companies that issue co-branded credit or check cards include Woori Card, NH Card, Industrial Bank of Korea and KB Kookmin Card. We engage in joint marketing efforts to promote cards issued pursuant to our co-branding agreements. However, we typically do not assume credit risks related to the inability of cardholders to make payments on their card usage, which are typically assumed by the member companies. As of December 31, 2018, we had approximately 19.9 million credit cards and approximately 34.0 million check cards issued by our member companies under the “BC Card” brand. We also provide ancillary outsourcing services to various other banks, securities companies and financial institutions that do not issue co-branded cards with us.

We charge commissions for merchant fees paid by merchants to credit card companies for processing transactions. Merchant fees vary depending on the type of merchant and the total transaction amounts generated by the merchant. In addition to merchant fees, we receive commissions related to nominal interchange fees for international card transactions, as well as service fees from financial institutions that outsource their credit card business operations.

K Bank

We own 10.00% of the common shares of K Bank, which is one of two Internet-only banks in Korea. Internet-only banks generally operate without branches and conduct their operations primarily through electronic means, which enable them to minimize costs and offer customers higher interest rates on deposits as well as lower lending rates. As of December 31, 2018, K Bank had approximately 0.86 million holders of deposit accounts, with total deposits of ￦1,862 billion and outstanding loans of ￦1,264 billion. K bank has 22 shareholders including Woori Bank, NH Investment & Securities, Co., Ltd., GS Retail Co., Ltd., Hanwha Life Insurance Co., Ltd. and us.

Pursuant to the Act on Special Cases Concerning the Establishment and Operation of Internet-only Banks, starting in January 2019, a company with its ICT assets comprising more than 50% of its total assets (such as us) may obtain up to a 34.0% interest in an Internet-only bank, and is required to obtain approval from the FSC in order to become its largest shareholder.

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Other Businesses

We also engage in various business activities that extend beyond telecommunications and financial services, including information technology and network services, real estate development and satellite services. Our other businesses accounted for 7.8% of our operating revenue in 2018.

Information Technology and Network Services

We offer a broad array of integrated information technology and network services to our business customers. Our range of services includes consulting, designing, building and maintaining systems and communication networks that satisfy the individual needs of our customers in the public and private sectors. We also operate data centers located throughout Korea and provide a wide range of computing services to companies that need servers, storage and leased lines. Data centers are facilities used to house, protect and maintain network server computers that store and deliver Internet and other network contents. Our data centers are designed to meet international standards, and are equipped with temperature and humidity control systems, regulated and reliable power supplies, mechanical equipment, fire detection and suppression equipment, security monitoring and wide-bandwidth connections to the Internet. Our data centers offer network outsourcing services, server operation services and system support services to our corporate customers.

Real Estate Development

We own land and real estate in various locations throughout Korea. Technological developments have enhanced the coverage area of telecommunications facilities, which enable us to better utilize our existing land and other real estate holdings. Through our wholly-owned subsidiary KT Estate, we engage in the planning and development of residential complexes and commercial buildings on our unused sites, as well as in the leasing of buildings we own. Under the “Remark VILL” brand, we also lease units in residential complexes developed by us in urban areas such as Seoul and Busan.

Sale of Goods

We recognize revenue related to sale of goods, primarily handsets sold to subscribers of our mobile services as well as miscellaneous telecommunications equipment sold to vendors and other telecommunications companies and sale of residential units and commercial real estate developed by KT Estate. We purchase handsets primarily from Samsung Electronics, Apple and LG Electronics. Sale of goods accounted for 14.0% of our operating revenue in 2018.

Our Rates

We offer various service plans for our mobile, fixed-line and media and content services. For our individual customers, we offer rate plans targeting specific customer segments that aim to address their individual needs. We also offer bundled rate plans that provide discounts for subscribing to a combination of our services, as well as family plans that provide discounts for multiple line subscriptions under one household. For many of our services, we provide additional discounts for customers who commit to extended subscription periods. We provide an online tool designed to help our customers select a plan that is customized to their needs. Our service rates are typically charged on a monthly basis and are due at the end of the month. Our customers are also assessed a 10.0% VAT.

Our rates for business customers are tailored to the specific needs of the business customers.

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Mobile Services

We offer a wide range of mobile service plans that vary depending, among others, on mobile technology (5G, LTE or W-CDMA), mobile device (mobile phone, tablet or other WiFi device) and age category, under which we offer plans based on usage volume for voice calling, data transmission and text messaging as well as addition of value-added services. Our premium packages offer unlimited voice calling, data transmission and text messaging as well as additional media content. We also provide plans specially designed for elderly and young subscribers as well as special discounts to subscribers with physical disabilities or on welfare programs. We do not charge an activation fee for our mobile services.

For mobile service plans that offer unlimited data transmission, we typically decelerate data transmission speeds after a subscriber reaches a set data usage threshold. For usage-based data transmission plans, our subscribers are typically charged additional data transmission fees if usage exceeds the applicable quota. However, for many of our plans, we provide our subscribers the ability to bank unused data transmission quota of the current month to the following month, or borrow quota allocated to the following month if the current monthly quota have been exhausted.

We also subsidize the purchase of new handsets by our qualifying subscribers who agree to use our service for a predetermined service period and purchase handsets on an installment basis. Under the Handset Distribution Reform Act, everyone, regardless of their status, is entitled to receive either a handset subsidy related to the purchase of a recently released mobile phone, or a discount on the mobile service subscription rate. The ceiling on handset subsidies previously imposed was phased out in October 2017, but the MSIT announced policy guidelines to promote additional discounts on mobile service subscription rates. Following such policy guidelines, we increased the maximum discount rate applicable to mobile subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017.

The following table summarizes the terms of our representative LTE mobile service plans that we currently offer:

Plan	Monthly Rate	Voice Calls	Video Calls	Data Transmission	Additional Features
Data On Premium	￦89,000	Unlimited	300 min.	Unlimited	•    Handset insurance using reward points •    Additional device free •    Media package offering music, video, webtoon and movie content.
Data On Video	￦69,000	Unlimited	300 min.	Unlimited, but decelerate to 5 Mbps after 100 GB	•    Mobile TV package offering live broadcast and VOD contents of up to 2 GB per day
Data On Talk	￦49,000	Unlimited	300 min.	Unlimited, but decelerate to 1 Mbps after 3 GB	•    Mobile TV package offering live broadcast and VOD contents of up to 2 GB per day
LTE Data Choice	￦32,890 to ￦109,890	Unlimited	30 min. to 200 min.	300 MB to unlimited, but decelerate to 5 Mbps after 30 GB	•    Media package for plans with monthly rates greater than ￦87,890 •    Mobile TV package for plans with monthly rates between ￦54,890 to ￦76,890
LTE Basic	￦33,000	Unlimited	50 min.	1 GB
LTE Voice	￦18,700	100 min.	None	None

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In addition to our mobile service plans, we offer value-added services for additional monthly fees that can be added to the subscription such as media packages, mobile TV packages, additional data transmission packages, caller ID, music service packages and ring tone services and usage reporting services. We also offer fixed-rate international roaming plans that provide data roaming services in various countries around the world, which may be scheduled or automatically activated upon access from an overseas location.

Our mobile services also generate interconnection charges and expenses. For a call initiated by a mobile subscriber of one of our competitors to our mobile subscriber, the competitor collects from its subscriber its normal rate and remits to us a mobile-to-mobile interconnection charge. In addition, for a call initiated by our mobile subscriber to a mobile subscriber of one of our competitors, we collect from our subscriber our normal rate and remit to the competitor a mobile-to-mobile interconnection charge.

The following table shows the interconnection charges we paid per minute (exclusive of VAT) to our competitors, and the charges received per minute (exclusive of VAT) from mobile operators for mobile to mobile calls:

	Effective Starting
	January 1, 2016		January 1, 2017		January 1, 2018
KT	￦	17.1	￦	14.6	￦	13.1
SK Telecom		17.0		14.6		13.1
LG U+		17.2		14.6		13.1

Fixed-line Services

Fixed-line Telephone Services

Local and Domestic Long-distance. Our standard usage-based fixed-line telephone service plan consists of a base monthly rate of ￦5,720 and usage fees for local and domestic long-distance calls, as well as calls to VoIP phones and mobile phones. We charge ￦42.9 per three-minute increment for local calls, ￦15.95 per ten second increment for domestic long-distance calls, ￦53.9 per three-minute increment for calls to VoIP phones and ￦15.95 per ten second increment for calls to mobile phones. All usage-based fees are subject to discounts during certain low-usage periods of the day and on national holidays. The rates we charge for local calls are subject to approval by the MSIT after consultation with the MOEF. For our subscribers who are initiating fixed-line telephone services, we charge a one-time nonrefundable activation fee of ￦60,000, which is waived with a three-year subscription commitment.

We also offer a flat rate fixed-line telephone service plan with a base monthly rate of ￦12,100 (or ￦8,470 for a three year subscription commitment) that includes 50 hours of local and domestic long-distance calls and calls to VoIP phones. Calls to mobile phones are not included in the free 50 hours, and we charge ￦15.95 per ten second increment for such calls. For a premium plan with a base monthly fee of ￦16,500 (or ￦11,550 for a three year subscription commitment), calls to KT mobile subscribers are included as part of the free 50 hours.

Until April 2001, we collected refundable service activation deposits for our fixed-line telephone services, which were refunded upon termination of service. As of December 31, 2018, we had ￦316 billion in refundable service activation deposits outstanding and 1.4 million subscribers enrolled under the deposit plan, each of whom are eligible to switch to a no-deposit plan and receive a refund of their service activation deposit, less the non-refundable service activation fee.

International Long-distance. For our international long-distance services, fees for out-going calls vary based on the destination country and whether the user has subscribed to an international

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long-distance services plan, which can be customized based on the type of telecommunication device (mobile or fixed-line), destination countries and other customer preferences. Usage is typically measured in one-second increments. We pay a settlement fee to the relevant foreign carrier for such calls under a bilateral agreement with the foreign carrier. For incoming calls (including calls placed in Korea by customers of the foreign carriers for home country direct-dial services), we receive settlement payments from the relevant foreign carrier at the applicable settlement rate specified under the relevant bilateral agreement.

Land-to-mobile Interconnection. We provide other telecommunications service providers, including mobile operators and other fixed-line operators, interconnection to our fixed-line network. For a call initiated by a landline user to a mobile service subscriber, we collect from the landline user the land-to-mobile usage charge and remit to the mobile service provider a land-to-mobile interconnection charge. We recognize as land-to-mobile interconnection revenue the entire amount of the usage charge collected from the landline user and recognize as expense the amount of interconnection charge paid to the mobile service provider. The MSIT periodically issues orders setting the interconnection charge calculation method applicable to interconnections with mobile service providers. The MSIT determines the land to mobile interconnection charge by calculating the long run incremental cost of mobile service providers, taking into consideration technology development and future expected costs.

The following table shows the interconnection charges we paid per minute (exclusive of VAT) to mobile operators for landline to mobile calls:

	Effective Starting
	January 1, 2016		January 1, 2017		January 1, 2018
SK Telecom	￦	17.0	￦	14.6	￦	13.1
LG U+		17.2		14.6		13.1

Land-to-land and Mobile-to-land Interconnection. For a call initiated by a landline subscriber of our competitor to our fixed-line user, the landline service provider collects from its subscriber its normal rate and remits to us a land-to-land interconnection charge. In addition, for a call initiated by a mobile service subscriber to our landline user, the mobile service provider collects from its subscriber its normal rate and remits to us a mobile-to-land interconnection charge.

The following table shows such interconnection charge per minute collected for a call depending on the type of call, as determined by the MSIT:

	Effective Starting
	January 1, 2016		January 1, 2017		January 1, 2018
Local access (1)	￦	10.9	￦	9.7	￦	8.7
Single toll access (2)		12.0		10.9		10.0
Double toll access (3)		15.5		14.8		12.7

Source: The MSIT.

(1) Interconnection between local switching center and local access line.

(2) Interconnection involving access to single long-distance switching center.

(3) Interconnection involving access to two long-distance switching centers.

VoIP Telephone Services

Our VoIP telephone services offer rate plans that charge generally lower base monthly rates and usage-based fees compared to our fixed-line telephone services. For our subscribers who are initiating VoIP telephone services, we charge a one-time nonrefundable activation fee of ￦10,000, which is waived with a one-year subscription commitment.

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Broadband Internet Access Services

We offer various broadband Internet access service plans based on data transmission speed and data usage thresholds and offer discounts based on length of commitment that are applied for periods of up to four years. Most of our plans also include WiFi routers that enable our subscribers to create a WiFi environment in their residences. We charge our customers a one-time installation fee per site of ￦27,500. We also charge a modem rental fee ranging from ￦4,400 to ￦22,000 per year that varies depending on the type of model required for the service plan, which is also subject to discounts and waivers based on length of subscription commitment period.

The following table summarizes the terms of our representative broadband Internet access service plans that we currently offer:

Plan	Monthly Rate		Rate with 3 Year Term		Maximum Speed	Max Speed Daily Limit (1)	Additional Features
10 GiGA Max 10G	￦	110,000	￦	88,000	10 Gbps	1000 GB	2 WiFi routers included.
10 GiGA Max 5G	￦	82,500	￦	60,500	5 Gbps	500 GB	2 WiFi routers included.
10 GiGA Max 2.5G	￦	60,500	￦	44,000	2.5 Gbps	250 GB	Discount on 1 WiFi router rental.
GiGA Internet Max 1G	￦	55,000	￦	38,500	1.0 Gbps	150 GB
GiGA Internet Max 100M	￦	39,600	￦	22,000	100 Mbps	None

(1) Data transmission speed is reduced to 100Mbps if data usage exceeds the specified maximum speed daily limit.

Media and Content Services

Our IPTV and satellite TV service plans vary based on the package of media channels provided, availability of UHD channels and the inclusion of other value-added services. In addition to monthly rates for subscription, we charge a one-time installation fee of ￦27,500 per set-top box and a digital set-top box rental fee ranging from ￦2,200 to ￦9,900 per year that varies depending on the type of set-top box required for the service plan, which is also subject to discounts and waivers based on length of subscription commitment period. We also offer various video-on-demand contents for streaming and downloading for a fee. In addition to offering service plans that enable TV viewing at home as well as access on mobile devices, we provide separate mobile TV plans at lower rates that are specifically designed for mobile devices.

The following table summarizes the terms of our representative IPTV and satellite TV service plans that we currently offer:

Plan	Monthly Rate		Rate with 3 Year Term		Channels (UHD)			Additional Features
Olleh TV Live
TV Movie Plus	￦	55,000	￦	44,000		261	(6)	•    Prime movie package that provides access to more than 20,000 video-on-demand contents. •    Catch-on & Plus channel dedicated to latest popular movies and dramas. •    Discounts on online TV home shopping purchases.
TV Slim	￦	16,500	￦	13,200		228	(3)
Olleh TV Skylife
TV Entertainment	￦	31,020	￦	24,816		216	(5)	•    Monthly coupon of ￦10,000 for video-on-demand.
TV Slim	￦	16,500	￦	13,200		199	(5)

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Bundled Rate Plans

In order to provide our customers with additional value and further promote our marketing efforts to cross sell our various services, we provide our customers with various bundled rate plans that provide discounts for subscribing to a combination of our services, as well as family plans that provide discounts for multiple line subscriptions under one household. As of December 31, 2018, the majority of our subscribers participated in our bundled rate plans.

Fixed-line Packages

We offer substantial discounts to customers who subscribe to two or more of our fixed-line and TV services consisting of fixed-line telephone, VoIP telephone, broadband Internet access, IPTV and satellite TV services. Subscription payments collected pursuant to our bundled rate plans are allocated to each service.

Mobile Packages

For our mobile services, we offer family plans that provide discounts of up to ￦11,000 per mobile phone subscription. Up to five members of a household may participate in our family plans.

Fixed-line and Mobile Combination Packages

We also offer various bundled rate plans that combine our fixed-line and TV services with mobile services, for both households and single subscribers. For households that subscribe to broadband Internet access as well as mobile services, our premium family plan provides discounts of approximately 50% for broadband Internet access subscription as well as for mobile services of each additional family member (up to four additional members).

Competition

We face significant competition in each of our principal business areas. In the markets for mobile services, fixed-line services and media and content services, we compete primarily with SK Telecom and LG U+ (including their affiliates). In the past two decades, considerable consolidation in the telecommunications industry has occurred, resulting in the current competitive landscape comprising three network service providers that offer a wide range of telecommunications and data communications services. In early 2019, each of our primary competitors announced plans to acquire a leading cable TV operator in Korea to significantly increase their market shares in the pay TV market, which we expect will further intensify competition. In January 2019, LG U+ announced its plan to acquire a controlling interest in CJ HelloVision. In February 2019, SK Telecom announced its plan to merge with t-broad. To a lesser extent, we also compete with various value-added service providers and specific service providers as classified under the Framework Act on Telecommunications and the Telecommunications Business Act, including MVNOs that lease mobile networks and offer mobile services, VoIP service providers that offer Internet telephone services, cable TV operators, text messaging service providers (particularly Kakao) and voice resellers, many of which offer competing services at lower prices.

We compete primarily based on our service performance, quality and reliability, ability to accurately identify and respond to evolving consumer demand, and pricing. With the launch of the next generation 5G mobile services in April 2019, we expect competition to further intensify among the three network service providers, which may result in an increase in marketing expenses, as well as additional capital expenditures related to implementing 5G mobile services. Mobile service providers also grant subsidies or subscription discount rates to subscribers who purchase new handsets and

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agree to a minimum subscription period and we compete also based on such amounts. We and SK Telecom have been designated as market-dominating business entities in the local telephone and mobile markets, respectively, under the Telecommunications Business Act. Under this Act, a market-dominating business entity may not engage in any act of abuse, such as unreasonably interfering with business activities of other business entities, hindering unfairly the entry of newcomers or substantially restricting competition to the detriment of the interests of consumers. In addition, changes in our local telephone rates and mobile rates of SK Telecom require prior approval from the MSIT. The KCC has also issued guidelines on fair competition of the telecommunications companies.

In the financial services market, our credit and check cards issued under the “BC Card” brand pursuant to co-brand agreements with member companies compete principally with cards issued by other leading credit card companies in Korea with their own merchant payment networks, such as Shinhan Card, Hyundai Card and Samsung Card. Our member companies that issue co-branded credit or check cards include Woori Card, NH Card, Industrial Bank of Korea and KB Kookmin Card. We also compete with service providers that provide outsourcing services related to business operations of credit card companies. Competition in the credit card and check card businesses has increased substantially as existing credit card companies, consumer finance companies and other financial institutions in Korea have made significant investments and engaged in aggressive marketing campaigns and promotions for their credit and check cards, as well as investing in operational infrastructure that may reduce the need for our outsourcing services.

The following tables show the market shares in our principal markets in terms of subscribers as of the dates indicated:

Mobile Services

	Market Share (%) (1)
	KT Corporation		SK Telecom		LG U+
December 31, 2016		30.8		48.8		20.4
December 31, 2017		31.4		47.9		20.7
December 31, 2018		31.8		46.9		21.3

Source: The MSIT.

(1) Includes subscribers of MVNOs that lease mobile networks of the respective mobile service provider.

Fixed-line Local Telephone and VoIP Services

	Market Share (%)
	KT Corporation		SK Broadband		LG U+
December 31, 2016		64.9		15.1		12.4
December 31, 2017		65.2		15.1		12.5
December 31, 2018		65.1		14.8		12.6

Source: Korea Telecommunications Operators Association.

Broadband Internet Access Services

	Market Share (%)
	KT Corporation		SK Broadband		LG U+		Others
December 31, 2016		41.4		25.3		17.6		15.7
December 31, 2017		41.4		25.7		18.0		14.9
December 31, 2018		41.0		25.4		18.9		14.7

Source: The MSIT.

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Pay TV Services

	Market Share (%)
	KT Corporation (1)		SK Broadband		LG U+
December 31, 2016		30.5		12.9		9.5
December 31, 2017		30.8		13.5		10.9
December 31, 2018		31.2		14.1		12.0

Source: Korea Telecommunications Operators Association.

(1) Including market share of KT Skylife.

Regulation

With the establishment of the MSIP in March 2013, many of the regulatory responsibilities formerly handled by the KCC have been transferred to the MSIP. On July 26, 2017, the MSIP was renamed as the Ministry of Science and ICT. Under the Framework Act on Telecommunications and the Telecommunications Business Act, the MSIT continues to have comprehensive regulatory authority over the telecommunications industry and all network service providers.

Since the establishment of its predecessor, the MSIP, the MSIT has assumed primary policy and regulatory responsibility for matters such as: (i) licensing of network service providers (the MSIT authorizes the licensing of IPTV service providers and, with the consent of the KCC, authorizes the licensing of satellite broadcasting companies); (ii) regulation of mergers and acquisitions, as well as license suspension and termination of network service providers; (iii) providing oversight on foreign ownership ratios in network service providers; and (iv) reviewing telecommunication matters as they relate to the public interest and approving ancillary telecommunication business activities. Additionally, the MSIT is responsible for a broad range of other policy and regulatory matters, including the administration and supervision of regulatory reporting by telecommunications companies, examination and analysis of accounting and business management practices in the industry, establishment and administration of policies governing telecommunications service fees, value-added service providers and specific service providers, as well as supervision of reporting requirements of standard telecommunications service/user contracts.

Under the supervisory framework, a network service provider must be licensed by the MSIT. Our license as a network service provider permits us to engage in a wide range of telecommunications services. However, starting on June 25, 2019, network service providers will be subject to a registration process, which will eliminate the distinction between network service providers and specific service providers that utilize leased facilities and are subject to a registration process. Such amendment will result in the integration of specific service providers into the broadened category of network service providers, and enable specific service providers to engage in a wider range of telecommunications services previously restricted to network service providers.

The KCC’s overall policy role is to play a key role in regulatory activities aimed at protecting service users in the broadcast and telecommunications market and it continues to be responsible for investigations and sanctions regarding violations by telecommunications companies, as well as for mediating disputes between service providers and users. The KCC is established under the direct jurisdiction of the President of Korea and is comprised of five standing commissioners. Commissioners of the KCC are appointed by the President, and the appointment of the Chairperson must be approved at a confirmation hearing at the National Assembly.

Under the Act on Promotion of Information and Communications Network Utilization and Information Protection, etc., telecommunications service providers are also required to protect personal information of their customers. Generally, when a telecommunications service provider intends to

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collect or use its customer’s personal information, such telecommunications service provider, with certain exceptions, must notify and receive the customers’ consent in relation to the purpose of collection, the use of the collected personal information, types of personal information collected and period during which the personal information will be possessed and used. Korean telecommunications providers may not use their customers’ personal information for any purpose other than the purpose their customers have consented to. In addition, there are various internal processes that the telecommunications providers are mandated to install in order to collect and handle personal information of their customers.

The MSIT also has the authority to regulate the pay TV market, including IPTV services. Under the Internet Multimedia Broadcasting Services Act, anyone intending to engage in the Internet multimedia broadcasting business must obtain a license from the MSIT. The ownership of the shares of an Internet multimedia broadcasting company by a newspaper, a news agency or a foreigner is limited. Furthermore, under the Internet Multimedia Broadcasting Services Act, an IPTV service provider, together with its affiliates providing IPTV services, is restricted from having more than one-third of the market share of all paid broadcasting subscribers in Korea (consisting of IPTV, cable TV and satellite TV subscribers).

Rates

Under current regulations implementing the Telecommunications Business Act, a network service provider may set its rates at its discretion, although it must report to the MSIT the rates and the general terms and conditions for each type of network service provided by it. However, if a network service provider has the largest market share for a specified type of service and its revenue from that service for the previous year exceeds a specific revenue amount set by the MSIT, it must obtain prior approval from the MSIT for the rates and the general terms for that service. Each year the MSIT designates the service providers and the types of services for which the rates and the general terms must be approved by the MSIT. In 1997, the MSIP designated us for local telephone service and SK Telecom for mobile service, which currently remains in effect. The MSIT, in consultation with the MOEF, is required to approve the rates proposed by a network service provider if (1) the proposed rates are appropriate, fair and reasonable and (2) the calculation method for the rates are appropriate and transparent. The form of our standard agreement for providing local network service and each agreement for interconnection with other service providers must also be reported to the MSIT.

The Government has also imposed regulations to restrict the amount of handset subsidies, which may cause mobile subscribers to subscribe to more expensive monthly plans in return for greater handset subsidies or may cause handset vendors to provide discriminatory subsidies based on consumers’ age, residence and subscription plan. In October 2014, the Handset Distribution Reform Act was implemented, with the primary objectives of reducing overall mobile service expenses to consumers, encouraging handset manufacturers to reduce retail prices and restricting discriminatory subsidy practices. Under the Handset Distribution Reform Act, everyone, regardless of their status, is entitled to receive either a handset subsidy related to the purchase of a recently released mobile phone, or a discount on the mobile service subscription rate. The ceiling on handset subsidies previously imposed was phased out in October 2017, but the MSIT announced policy guidelines to promote additional discounts on mobile service subscription rates. Following such policy guidelines, mobile service providers increased the maximum discount rate applicable to subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017. The MSIT may periodically announce additional policy guidelines that telecommunications companies are recommended to take into consideration. In recent years, the MSIT has announced policy guidelines with objectives of reducing telecommunications service rates and promoting transparency in the decision making of telecommunications service providers. Specific policy guidelines include monthly rate reductions applicable to certain low-income subscribers, which was implemented by mobile service providers in December 2017.

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Other Activities

A network service provider, such as us, must obtain the permission of the MSIT in order to:

• modify its licenses;

• discontinue, suspend or spin off all or a part of the business for which it is licensed;

• transfer or acquire all or a part of the business of another network service provider; or

• enter into a merger with another network service provider.

By submitting a report to the MSIT, a network service provider may enter into arrangements for services to be furnished to its customers by a different telecommunications service provider and, in connection therewith, may provide its telecommunications services to, or authorize the use of all or a portion of its telecommunications facilities by, such other telecommunications service provider. The MSIT can revoke our licenses or order the suspension of any of our businesses if we do not comply with the regulations of the MSIT under the Telecommunications Business Act.

The responsibilities of the MSIT include:

• drafting and implementing plans for developing telecommunications technology;

• fostering and providing guidance to institutions and entities that conduct research relating to telecommunications; and

• recommending to network service providers that they invest in research and development or that they contribute to telecommunications research institutes in Korea.

In addition, all network service providers (other than regional paging service providers) are obligated to contribute toward the supply of “universal” telecommunications services in Korea. Telecommunications service providers designated as “universal service providers” by the MSIT are required to provide universal telecommunications services such as local services, local public telephone services, discount services for persons with disabilities and for certain low-income persons, telecommunications services for remote islands and wireless communication services for ships. We have been designated as a universal service provider. The costs and losses recognized by universal service providers in connection with providing these universal telecommunications services, except for discount services for persons with disabilities and for certain low-income persons, will be shared on an annual basis by all network service providers (other than regional paging service providers), including us, on a pro rata basis based on their respective net annual revenue calculated pursuant to a formula set by the MSIT. As for the costs and losses recognized by a universal service provider in connection with providing discount services for persons with disabilities and for certain low-income persons, such costs and losses will be borne by such universal service provider.

Prior to April 2018, in accordance with the MSIT’s determination that we possessed essential infrastructure, we were required to permit other fixed-line communications service providers to co-use our fixed-line telecommunication infrastructure, upon the request of such other fixed-line telecommunications service providers. On April 10, 2018, to facilitate expedient establishment of 5G mobile services infrastructure, the Government announced its initiatives to amend the co-use system, as follows: (i) we should permit not only fixed-line telecommunications service providers, but also mobile service providers such as SK Telecom and LG U+ to co-use our telecommunications infrastructure necessary for provision of 5G mobile services, (ii) the Government determined that we,

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SK Telecom, SK Broadband and LG U+ possessed essential infrastructure with respect to the interval between the cable entry at a building and the initial occurrence of connection within the building and required that the three companies share such infrastructure throughout buildings in Korea with each other, and (iii) fixed-line telecommunications service providers and mobile service providers are required to participate in joint efforts to construct additional fixed-line and mobile network architecture. For more information on our mobile network architecture, see “Item 4.D. Property, Plant and Equipment—Mobile Networks.”

In addition, we are required to lease to other companies our fixed-lines that connect subscribers to our network. This system, which is called local loop unbundling, is intended to prevent excessive investment in local loops. This system requires us to lease the portion of our copper lines that represent our excess capacity to other companies upon their request at rates that are determined by the MSIT based on our cost, and taking into consideration an appropriate rate of return, to enable them to provide voice and broadband services. Revenue from local loop unbundling, if any, are recognized as revenue from other businesses.

Foreign Investment

The Telecommunications Business Act restricts the ownership and control of network service providers by foreign shareholders. Foreigners, foreign governments and “foreign invested companies” may not in the aggregate own more than 49.0% of the issued shares with voting rights of a network service provider, including us. For purposes of the Telecommunications Business Act, the term “foreign invested company” means a company in which a foreigner or a foreign government is the largest shareholder and holds 15.0% or more of the company’s shares with voting rights, provided, however, that such company will not be counted as a foreign shareholder for the purposes of the 49.0% limit if (1) it holds less than 1.0% of our total issued and outstanding shares with voting rights or (2) if the largest shareholder of such company is a government or foreign entity of a country that is a counterparty to a free trade agreement with Korea, as publicly announced by the MSIT, and the MSIT determines that the fact that such foreign government or entity holds a 15.0% or greater shareholding in such company does not present a risk of harm to the public interest. However, the calculation of the above-referenced 49% ceiling will apply to: (x) any foreign entities that have entered into a major management-related agreement with a network service provider or the shareholder(s) thereof; and (y) foreign entities that have entered into an agreement pertaining to the settlement of fees relating to the handling of international electronic telecommunications services. As of December 31, 2018, 48.5% of our common shares were owned by foreign investors. In the event that a network service provider violates the shareholding restrictions, its foreign shareholders cannot exercise voting rights for their shares in excess of such limitation, and the MSIT may require corrective measures be taken to comply with the ownership restrictions. There is no restriction on foreign ownership for specific service providers and value-added service providers.

In addition to the 49.0% limit referenced above, under the Telecommunications Business Act, a foreign shareholder who holds 5.0% or more of our total shares is prohibited from becoming our largest shareholder. However, any foreign shareholder who held 5.0% or more of our total shares and was our largest shareholder on or prior to May 9, 2004 is exempt from the regulations, provided that such foreign shareholder may not acquire any more of our shares. In addition, under the Telecommunications Business Act, the MSIT may, if it deems it necessary to preserve substantial public interests, prohibit a foreign shareholder from being our largest shareholder. In the event that any foreigner or foreign government acquires our shares in violation of the above provisions, the Telecommunications Business Act restricts such foreign shareholder from exercising his or her voting rights with respect to common shares exceeding such threshold. The MSIT may also order us or the foreign shareholder to take corrective measures in respect of the excess shares within a period of up to six months.

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Customers and Customer Billing

We typically charge residential subscribers and business subscribers similar rates for services provided. On a case-by-case basis, we also provide discount rates for some of our high-volume business subscribers. We bill all of our customers on a monthly basis. Our customers may make payment at either payment points such as local post offices, banks or our service offices, through a direct-debit service that automatically deducts the monthly payment from a subscriber’s designated bank account, or through a direct-charge service that automatically charges the monthly payment to a subscriber’s designated credit card account. Approximately 86.3% of our subscribers as of December 31, 2018 pay through the direct-debit service. Accounts of subscribers who fail to pay our invoice are transferred to a collection agency, which sends out a notice of payment. If such charges are not paid after notice, we cease to provide outgoing service to such subscribers after a period of time determined by the type of subscribed service. If charges are still not paid two to three months after outgoing service is cut off, we cease all services to such subscribers. After service is ceased, the overdue charges that are not collected by the collection agency are written off.

Credit Card Business

Through BC Card in which we hold a 69.54% interest, we offer various credit card processing and related financial services. BC Card is regulated and supervised as a Specialized Credit Financial Business (“SCFB”), as defined under the Specialized Credit Financial Businesses Act of Korea (“SCFBA”). The SCFBA subjects SCFB companies to licensing (for credit card businesses) and registration (for leasing, installment finance or new technology finance businesses) requirements and provides guidance and restrictions regarding capital adequacy, liquidity ratios, loans to major shareholders, reporting and other matters relating to the supervision of SCFB companies. The SCFBA delegates regulatory authority over SCFB companies to the FSC and FSS. The FSC has the authority to suspend the operations of an SCFB company for up to six months for non-compliance with certain regulations under the SCFBA and issue certain administrative orders. The FSC is also entitled to cancel a license or registration if an SCFB company fails to comply with certain SCFBA regulations or FSC administrative orders, including a suspension order.

The SCFBA and the regulations thereunder require an SCFB company to satisfy a minimum paid-in capital amount of (i) Won 20 billion, where the SCFB company engages in no more than two kinds of core businesses and (ii) Won 40 billion, where the SCFB company, such as BC Card, engages in three or more kinds of core businesses. An SCFB engaging in a credit card business must maintain a total Tier I and Tier II capital adequacy ratio (adjusted equity capital divided by adjusted total assets) of 8% or more. In addition, an SCFB company must maintain a one-month-or-longer delinquent claim ratio (delinquent claims divided by total claims) of less than 10%.

Under the SCFBA and the regulations thereunder, an SCFB company is required to maintain a Won liquidity ratio (Won-denominated current assets divided by Won-denominated current liabilities) of 100% or more. In addition, if an SCFB company is registered as a foreign exchange business institution with the MOEF, such SCFB company is required to maintain (1) a foreign-currency liquidity ratio (foreign currency liquid assets due within three months divided by foreign-currency liabilities due within three months) of not less than 80%, (2) a ratio of foreign currency liquid assets due within seven days less foreign currency liabilities due within seven days, divided by total foreign-currency assets, of not less than 0%, and (3) a ratio of foreign currency liquid assets due within a month less foreign currency liabilities due within a month, divided by total foreign-currency assets, of not less than negative 10%.

Under the SCFBA and the regulations thereunder, an SCFB company may not provide loans in the aggregate exceeding 50% of its equity capital to its major shareholders (including their specially related persons).

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Pursuant to the SCFBA and the regulations thereunder, an SCFB company is required to submit business reports to the FSC regarding, among others, financial statements, actual results of management and soundness of assets. An SCFB company is also required to provide information regarding specific matters, including: (i) the amount of loans provided to major shareholders as of the end of each quarter; (ii) changes in the aggregate amount of such loans and the terms and conditions of the credit extension transactions for each quarter; (iii) the amount of stocks acquired by major shareholders as of the end of each quarter; and (iv) changes in the aggregate amount of stocks held and the acquisition price of such stocks for each quarter, in each case within one month of the end of each quarter. In addition, an SCFB company is required to file a report to the FSC upon the occurrence of certain events, including (i) changes to its name; (ii) changes to the largest shareholder; or (iii) changes of 1% or more in the ownership of stocks with voting rights held by a major shareholder and such major shareholder’s specially related persons, in each case within seven days from the date of its occurrence.

Insurance

We carry insurance against loss or damage to all significant buildings and automobiles. Except for our insurance coverage of our satellites and data centers, we do not carry insurance covering losses to outside plants or to equipment because we believe the cost of such insurance is excessive and the risk of material loss or damage is insignificant. We do not have any provisions or reserves against such loss or damage. We do not carry any business interruption insurance.

We provide co-location and a variety of value-added services including server-hosting services to a number of corporations whose business largely depends on critical data operated on our servers or on their servers located at our data centers. Any disruptions, interruptions, physical or electronic data loss, delays or slowdowns in communication connections could expose us to potential liabilities for losses relating to the disrupted businesses of our customers relying on our services.

Information Technology and Operational Systems

Enhancement of our information technology and operational systems and efficient utilization of such systems are important in effectively promoting our core strategies. We are committed to continually investing in and enhancing our information technology systems, which provide support to many aspects of our businesses. In order to respond more effectively to a changing business environment, an enterprise resource planning system (the “ERP System”) was implemented in July 2012. We are committed to continually investing in and enhancing our information technology systems, which provide support to many aspects of our businesses. In June 2017, a business support system, called KT One System (“KOS”), was implemented. KOS is our wired/wireless system integration program that unified wired/wireless workflows, structures and systems that had been separated previously. KOS has contributed to enhancing various aspects of our business processes and control systems.

Patents and Licensed Technology

The ability to obtain and protect intellectual property rights to the latest telecommunications technology is important for our business. We own or have licenses to various patents and trademarks in Korea and overseas, and have applications for patents pending in Korea and other select countries such as the United States, Europe, China and Japan. A majority of our patents registered in Korea and overseas relate to our wireless and fixed-line telecommunications, media and IoT technologies. In addition, we operate several research and development (“R&D”) laboratories to develop latest technology and additional platforms, as described in “Item 5.C. Research and Development, Patents and Licenses, Etc.” We license our intellectual property rights to third parties in return for periodic royal payments. We currently do not license any material technologies or patents from third parties.

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Seasonality of the Business

Our main business generally does not experience significant seasonality.

Item 4.C.  Organizational Structure

These matters are discussed under Item 4.B. where relevant.

Item 4.D.  Property, Plant and Equipment

Our principal fixed asset is our integrated telecommunications networks. In addition, we own buildings and real estate throughout Korea. As of December 31, 2018, the net book value of our property, plant and equipment was ￦13,068 billion, of which ￦3,289 billion is accounted for the net book value of our land, buildings and structures. As of December 31, 2018, the net book value of our investment properties, which is accounted for separately from our property and equipment was ￦1,091 billion. Other than as may be described in this annual report, no significant amount of our properties is leased. There are no material encumbrances on our properties including the fixed assets below.

Our fixed-line equipment vendors and mobile equipment suppliers include well-known international and local suppliers such as Samsung Electronics, Ericsson, Nokia and Cisco Systems.

Mobile Networks

Our mobile network architecture includes the following components:

• cell sites, which are physical locations equipped with base transceiver stations consisting of transmitters, receivers and other equipment used to communicate through radio channels with subscribers’ mobile telephone handsets within the range of a cell;

• base station controllers, which connect to and control, the base transceiver stations;

• mobile switching centers, which in turn control the base station controllers and the routing of telephone calls; and

• transmission lines, which connect the mobile switching centers, base station controllers, base transceiver stations and the public switched telephone network.

One of the principal limitations on a wireless network’s subscriber capacity is the amount of bandwidth allocated to a service provider. We have acquired a number of bandwidth licenses to secure additional bandwidth capacity to provide our broad range of services, for which we typically make an initial payment as well as pay usage fees during the license period. See “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results—Overview—Acquisition of New Bandwidth Licenses and Usage Fees.”

Exchanges

Exchanges include local exchanges and “toll” exchanges that connect local exchanges to long-distance transmission facilities. We had approximately 23.6 million lines connected to local exchanges and 2.2 million lines connected to toll exchanges as of December 31, 2018.

All of our exchanges are fully digital and automatic in order to provide higher speed and larger volume services. In addition, all of our lines connected to toll exchanges are compatible to IP platform.

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Internet Backbone

Our Internet backbone network, called KORNET, has the capacity to handle aggregate traffic of our broadband Internet access subscribers, data centers and Internet exchange system at any given moment of up to 15.7 Tbps as of December 31, 2018. We have set up contingent plans to prepare against various incidents that could affect reliable Internet access service. Our IP premium network enables us to more reliably support IPTV, VoIP and other IP-related services. As of December 31, 2018, our IP premium network had 3,112 lines installed to provide mobile data services, 1,556 lines installed to provide IPTV services and a total capacity to handle up to 3.2 Tbps of IPTV, voice, mobile data and virtual private network (“VPN”) service traffic.

Access Lines

As of December 31, 2018, we had 21.9 million access lines installed, which allow us to reach virtually all homes and businesses in Korea. As part of our broadband deployment strategy, we have upgraded many of our access lines by equipping them with broadband capability using ADSL and FTTH technology. As of December 31, 2018, we had approximately 21.4 million broadband lines with speed of at least 50 Mbps that enable us to deliver broadband Internet access and multimedia contents to our customers.

Transmission Networks

Our domestic fiber optic cable network consisted of 784,088 kilometers of fiber optic cables as of December 31, 2018 of which 119,468 kilometers of fiber optic cables are used to connect our backbone network and 664,620 kilometers are used to connect the backbone network to our subscribers. Our backbone network utilizes 64 Tbp Long-haul Reconfigurable Optical Add Drop Multiplexer (“ROADM”) technology for connecting cities. ROADM technology improves bandwidth efficiency by enabling data to be transmitted from multiple signals across one fiber strand in a cable and carrying each signal on a separate wavelength. Our transmission backbone network connecting major cities in Korea utilize optical cross-connectors (“OXC”), and we access such network through multi-service provisioning platform (“MSPP”) architecture.

Our extensive domestic long-distance network is supplemented by our fully digital domestic microwave network, which consisted of 55 relay sites as of December 31, 2018.

International Networks

Our international network infrastructure consists of both submarine cables and satellite transmission systems, including two submarine cable-landing stations in Busan and Keoje and two satellite teleports in Kumsan and Boeun. International traffic is handled by submarine cables and telecommunications satellites. Because of the high cost of laying a submarine cable, the usual practice is for multiple carriers to jointly commission a new cable and share the costs and the capacity. We own interests in several international fiber optic submarine cable networks. We also operate satellites periodically launched by us, as well as lease satellite capacity from other satellite operators. Data services such as international private lease circuits, IP and very small aperture terminals are provided through submarine cables and satellite transmission. In order to guarantee high quality services to our end customers, our submarine cables and satellite transmission systems are linked to various points-of-presence in the United States, Asia and Europe. In addition, as of December 31, 2018, our international telecommunications networks were directly linked to 228 telecommunications service providers in various international destinations and are routed through our three international switching centers in Seoul, Daejeon and Busan.

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As of December 31, 2018, our international Internet backbone with capacity of approximately 1,500 Gbps is connected to approximately 280 Internet service providers through our two Internet gateways in Hyehwa and Guro. In addition, we operate a video backbone with capacity of 1.5 Gbps to transmit video signals from Korea to the rest of the world.

Item 4A.  Unresolved Staff Comments

We do not have any unresolved comments from the Securities and Exchange Commission staff regarding our periodic reports under the Exchange Act of 1934.

Item 5.  Operating and Financial Review and Prospects

Item 5.A.  Operating Results

The following discussion and analysis is based on our consolidated financial statements, which have been prepared in accordance with IFRS as issued by the IASB.

Overview

We are an integrated provider of telecommunications services. Our principal telecommunications and Internet-related services include mobile voice and data telecommunications services, fixed-line services (consisting of fixed-line telephone, VoIP telephone, broadband Internet access and data communication services) and media and content services (including IPTV and satellite TV). The principal factors affecting our revenue from these services have been our rates for, and the usage volume of, these services, as well as the number of subscribers. For information on rates we charge for our services, see “Item 4. Information on the Company—Item 4.B. Business Overview—Our Rates.” In addition, we derive revenue from credit card processing and other financial services, sale of goods (primarily handsets related to our mobile services and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed KT Estate), and miscellaneous business activities including information technology and network services, real estate development and satellite services.

Our operating segments for financial reporting purposes are organized as the following:

• the marketing/customer segment, which engages in providing various telecommunications services to individual and household customers and the convergence business;

• the corporate customer businesses group, which engages in providing various integrated telecommunications and network services to corporate customers;

• the finance segment, which engages in providing various financial services such as credit card services;

• the satellite TV segment, which engages in satellite TV services; and

• the others segment, which includes (i) security services, (ii) satellite service, (iii) information technology and network services, (iv) global business services that provide global network services to multinational or domestic corporate customers and telecommunications companies, (v) sale of handsets and (vi) real property development and leasing services and other services provided by our subsidiaries.

One of the major factors contributing to our historical performance was the growth of the Korean economy, and our future performance will depend at least in part on Korea’s general economic

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growth and prospects. For a description of recent developments that have had and may continue to have an adverse effect on our results of operations and financial condition, see “Item 3. Key Information—Item 3.D. Risk Factors—If economic conditions in Korea deteriorate, our current business and future growth could be materially and adversely affected.” A number of other developments have had or are expected to have a material impact on our results of operations, financial condition and capital expenditures. These developments include:

• acquisition of new bandwidth licenses and usage fees;

• researching and implementing technology upgrades and additional telecommunications services such as 5G technologies;

• changes in the rate structure for our telecommunications services;

• acquisitions and disposals of interests in subsidiaries and joint ventures; and

• marketing activities.

As a result of these factors, our financial results in the past may not be indicative of future results or trends in those results.

Acquisition of New Bandwidth Licenses and Usage Fees

One of the principal limitations on a wireless network’s subscriber capacity is the amount of bandwidth allocated to a service provider. The growth of our mobile telecommunications business and the increase in usage of wireless data transmission services have been significant factors in the increased utilization of our bandwidth, since wireless data applications are generally more bandwidth-intensive than voice services. The current trend of increasing data transmission use and the increasing sophistication of multimedia contents are likely to put additional strain on the bandwidth capacity of mobile service providers. We have acquired a number of licenses in recent years to secure additional bandwidth capacity to provide our broad range of services, for which we typically make an initial payment as well as pay usage fees during the license period.

We made bandwidth license payments of ￦416 billion in 2016, ￦271 billion in 2017 and ￦573 billion in 2018. The following table sets forth our outstanding payment obligations relating to our bandwidth licenses as of December 31, 2018.

Spectrum	Bandwidth	License Acquisition Date	Total Payable Amount (in billions of Won)		Initial Payment Amount (in billions of Won)		Initial Payment Year		Annual Usage Fee (in billions of Won)		Annual Usage Fee Payment Term
800 MHz	10 MHz	July 1, 2012	￦	261	￦	65		2012	￦	33	2012 to 2020
900 MHz	20 MHz	July 1, 2011	￦	251	￦	126		2011	￦	17	2011 to 2021
1.8 GHz	20 MHz	July 1, 2011	￦	194	￦	97		2011	￦	17	2011 to 2021
1.8 GHz	15 MHz	September 10, 2013	￦	878	￦	219		2013	￦	82	2013 to 2021
1.8 GHz	20 MHz	August 4, 2016	￦	470	￦	117		2016	￦	35	2016 to 2026
2.1 GHz	40 MHz	December 4, 2016	￦	569	￦	142		2016	￦	85	2016 to 2021
2.3 GHz	30 MHz	March 30, 2012	￦	19	￦	10		2012	￦	2	2012 to 2019
3.5 GHz	100 MHz	December 1, 2018	￦	968	￦	242		2018	￦	73	2018 to 2028
28 GHz	800 MHz	December 1, 2018	￦	208	￦	52		2018	￦	31	2018 to 2023

Researching and Implementing Technology Upgrades and Additional Telecommunications Services such as 5G Technologies

The telecommunications industry is characterized by continual advances and improvements in telecommunications technology, and we have been continually researching and implementing network

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upgrades and launching additional telecommunications services to maintain our competitiveness. In recent years, we have made extensive efforts to continually develop mobile services with enhanced speed, latency and connectivity that enable us to offer significantly improved wireless data transmission with faster access to multimedia content. We commercially launched our next generation 5G mobile services with transmission speed of up to 1 Gbps in April 2019 in the Seoul metropolitan area, six additional metropolitan cities, high-traffic commercial areas and university campuses as well as major transportation infrastructure such as highways, railways and airports. We plan to gradually expand the coverage nationwide and increase the transmission speed of our 5G services thereafter.

We also make investments to continually upgrade our broadband network to enable better FTTH connection, which further enhances data transmission speed and connection quality. FTTH is a telecommunication architecture in which a communication path is provided over optical fiber cables extending from the telecommunications operator’s switching equipment to the boundary of home or office. FTTH uses fiber optic cable, which is able to carry a high-bandwidth signal for longer distances without degradation. FTTH enables us to deliver enhanced services that require high bandwidth with stability, such as IPTV and other digital media content. The MSIT has the authority to recommend to network service providers that they provide funds for national research and development of telecommunications technology and related projects. Including such contributions, total expenditures (which include capitalized expenses) on research and development were ￦215 billion in 2016, ￦435 billion in 2017 and ￦273 billion in 2018. We plan to continue to invest in researching and implementing network upgrades, which will entail additional operating expenses as well as capital expenditures.

Changes in the Rate Structure and Fee Discounts for Our Telecommunications Services

Periodically, we adjust our rate structure for our services. In order to mitigate the impact from lower usage charges of local and domestic long-distance calls, we have increased our basic monthly charges and offer various optional flat rate plans for our fixed-line subscribers. Such adjustments in the rate structure have increased the portion of fixed income and stabilized our cash flow. In addition, because the growing use of mobile telecommunications services has decreased the usage of our fixed-line telephone services, we believe we are able to maximize our revenue from fixed-line telephone services by adjusting the rate structure so as to increase our basic monthly charges. We also provide bundled packages of our various services at a discount in order to attract additional subscribers to our new services. We offer discounts to customers who subscribe to two or more of our fixed-line and TV services consisting of fixed-line telephone, VoIP telephone, broadband Internet access, IPTV and satellite TV services. For our mobile services, we offer family plans that provide discounts of up to ￦11,000 per mobile phone subscription. We also offer various bundled rate plans that combine our fixed-line and TV services with mobile services, for both households and single subscribers. See “Item 4. Information on the Company—Item 4.B. Business Overview—Our Rates.”

The MSIT, in consultation with the MOEF, currently approves rates charged by us for local telephone service. The form of our standard agreement for providing local network service and each agreement for interconnection with other service providers must also be reported to the MSIT. Although we compete freely with other network service providers in terms of rate plans for our principal telecommunications and Internet-related services except for rates we charge for local calls, the MSIT may periodically announce policy guidelines that we may be recommended to take into consideration. In recent years, the MSIT has announced policy guidelines with the objectives of reducing mobile service rates and promoting transparency in the decision making of telecommunications service providers. Specific policy guidelines include monthly rate reductions applicable to certain low-income subscribers as well as subscription rate discounts in lieu of handset subsidies. Starting in December 2017, we began providing rate discounts of up to ￦11,000 per month to our low-income mobile subscribers on government welfare programs. We also increased the maximum discount rate

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applicable to mobile subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017. Such discounts have contributed to a decrease in the average monthly revenue per subscriber of our mobile services from ￦34,444 in 2017 to ￦32,021 in 2018.

The Government may pursue additional measures to regulate the markets in which we compete. For example, according to a proposed amendment to the Telecommunications Business Act, which is currently pending at the National Assembly, the market-dominating mobile network service provider (SK Telecom) is required to provide a “universal” mobile subscription plan at a significant discount to the rates currently available. The current proposal contemplates that the plan be priced at ￦20,000 per month (including VAT) for up to 200 call minutes and data usage of 1 GB. If adopted as proposed, we may offer similar rate plans to compete more effectively with SK Telecom. There can be no assurance that we will not adopt additional measures that reduce rates charged to our subscribers as well as adjustments to our handset subsidies and other measures in the future to comply with regulatory requirements or the Government’s policy guidelines. For a discussion of adjustments in our rate structure, see “Item 4. Information on the Company—Item 4.B. Business Overview—Our Rates.”

Acquisitions and Disposals of Interests in Subsidiaries and Joint Ventures

One key aspect of our overall business strategy calls for acquisitions of businesses and entering into joint ventures that complement or diversify our current business, as well as disposal or termination of such businesses from time to time. For example, we have pursued investment opportunities in the financial sector in the past decade that we believe provide attractive growth opportunities. In October 2011, we acquired a controlling interest in BC Card, a leading credit card solutions provider in Korea in which we hold a 69.54% interest. We also acquired 10.00% of the common shares of K Bank, an Internet-only bank that began its commercial operations in April 2017, which interest is accounted for using the equity method of accounting. Our financial condition and results of operations may be affected as a result of such acquisitions, disposals or consolidation. Furthermore, pursuing acquisitions, joint venture and certain investment transactions also requires significant capital, and as we pursue further growth opportunities for the future, we may need to raise additional capital by incurring loans or through the issuances of bonds or other securities in the international capital markets, which may lead to increased levels of debt and debt servicing costs in the future.

Marketing Activities

We engage in marketing activities to promote our new, as well as existing, products and services and to further strengthen our marketing efforts through our network of independent exclusive dealers and other third-party dealers. Our marketing expenses, consisting of sales commissions and advertising expenses, amounted to ￦2,154 billion in 2016, ￦2,399 billion in 2017 and ￦2,101 billion in 2018. Sales commissions primarily consist of sales commissions to third-party dealers related to procurement of mobile subscribers and mobile handset sales, and our advertising expenses relate primarily to our utilization of television commercials and Internet and mobile advertising as well as promotional events.

While we believe that our large subscriber base as well as the brand power of our products and services will remain key drivers of our growth, we expect to continue to invest significantly in marketing activities, particularly in connection with launching of new products and services such as our next generation 5G mobile services launched in April 2019. Our marketing expenses may not directly correspond to our revenue in the same period, and our quarterly marketing expenses have fluctuated in the past and are expected to continue to fluctuate in the future.

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Critical Accounting Policies

We have prepared our consolidated financial statements in accordance with IFRS as issued by the IASB. These accounting principles require our management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and revenue and expenses during the years reported. We based our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying amounts of assets and liabilities that are not readily apparent from other sources. On an on-going basis, management evaluates its estimates. Actual results may differ from those estimates under different assumptions and conditions.

The fundamental objective of financial reporting is to provide useful information that allows a reader to comprehend our business activities. To aid in that understanding, our management has identified “critical accounting estimates.” These estimates have the potential to have a more significant impact on our financial statements, either because of the significance of the financial statement item to which they relate, or because they require judgment and estimation due to the uncertainty involved in measuring, at a specific point in time, events which are continuous in nature.

These critical accounting estimates include:

• allowances for doubtful accounts;

• useful lives of property, equipment, intangible assets and investment property;

• impairment of long-lived assets, including goodwill;

• valuation and impairment of financial assets;

• income taxes;

• post-employment benefit liabilities; and

• provisions.

Allowances for Doubtful Accounts

Allowance for doubtful accounts is our best estimate of the amount of impairment losses incurred on our existing notes and accounts receivable. We apply the simplified approach, which requires expected lifetime credit losses to be recognized from the initial recognition of the receivable. Account balances are charged off against the allowance when all means of collection have been exhausted and the potential for recovery is considered remote. Our past experience shows that the possibility of collection is remote after three years of collection effort.

Changes in the allowances for doubtful accounts for our trade and other receivables in the three-year period ended December 31, 2018 are summarized as follows:

	Year Ended December 31,
	2016			2017			2018
	(In millions of Won)
Balance at beginning of year	￦	719,583		￦	612,487		￦	523,799
Provision		92,711			44,697			113,065
Reversal or written-off		(189,156	)		(131,341	)		(185,117	)
Changes in the scope of consolidation		271			(142	)		—
Others		(10,922	)		(1,902	)		1,999
Balance at end of year	￦	612,487		￦	523,799		￦	453,746

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If economic or specific industry trends change, we would adjust our allowances for doubtful accounts by recording additional expense or benefit. See Note 6 of the Consolidated Financial Statements.

Useful Lives of Property, Equipment, Intangible Assets and Investment Property

Property and equipment, intangible assets and investment properties (excluding land, condominium memberships, golf club memberships and broadcasting concession) are depreciated using the straight-line method over their useful lives as disclosed in Note 3.8 to the Consolidated Financial Statements. An asset’s residual value and useful lives are reviewed and adjusted at the end of each financial reporting period, and are based on historical experience with similar assets as well as taking into account anticipated technological or other changes. If technological changes were to occur more rapidly than anticipated or in a different form than anticipated, the useful lives assigned to these assets may need to be shortened, resulting in the recognition of increased depreciation expense in future periods.

Impairment of Long-Lived Assets, including Goodwill

Long-lived assets generally consist of property and equipment and intangible assets, including goodwill. We review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. In addition, we evaluate our long-lived assets for impairment each year as part of our annual forecasting process. An impairment loss would be recognized when the asset’s recoverable amount is less than its carrying amount. The recoverable amount of a long-lived asset is the greater of an asset’s fair value less costs to sell and its value in use. For the purpose of assessing impairment, assets are grouped at the lowest levels for which there are separately identifiable cash flows (cash-generating units). The recoverable amounts of cash-generating units are based on their value in use calculated by applying the annual discount rate ranging from 6.24% to 24.30% (depending on the segment) to the estimated future cash flows based on financial budgets for the next five years. An annual growth rate of 0.0% to 1.0% was applied for the cash flows expected to be incurred after five years. If such assets are considered to be impaired, the impairment to be recognized is measured as the amount by which the carrying amount of the assets exceeds the estimated recovery value.

Goodwill represents the excess of purchase price paid over the fair value assigned to the identifiable net assets of acquired businesses. The determination of the fair values of goodwill is based on management’s judgment on the expected cash flows of the cash-generating units to which the goodwill is allocated, taking market demand, competition and other economic factors into consideration. The determination of impairments of goodwill involves the use of estimates that include, but are not limited to, the cause, timing and amount of the impairment. Impairment is based on a large number of factors, such as changes in current competitive conditions, expectations of growth in the telecommunications industry, a decline in our expected future cash flows, changes in the future availability of financing, technological obsolescence, discontinuance of services, current replacement costs and prices paid in comparable transactions. For example, in 2017, we recognized impairment losses of ￦78 billion on goodwill allocated to KT Skylife primarily due to a decrease in the expected recoverable amount resulting from a decrease in KT Skylife’s market value in 2017. See Note 13 of the Consolidated Financial Statements.

Valuation and Impairment of Financial Assets

The fair value of financial instruments, including derivative instruments, which are not traded in an active market, is determined by using valuation techniques. Our management uses its judgment to select a variety of methods and makes assumptions that are mainly based on market conditions existing at the end of each reporting period.

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We record rights and obligations arising from derivative instruments as assets and liabilities, which are stated at fair value. Gains and losses that result from a change in the fair value of derivative instruments are recognized in current earnings. However, for derivative instruments that qualify for cash flow hedge accounting, the effective portion of the gain or loss on the derivative instruments is recognized in the cash flow hedge reserve within equity, and recognized as finance income (costs) for the periods when the corresponding transactions affect profit or loss.

For financial assets, we make an annual assessment at the end of each reporting date whether there is objective evidence that a financial asset or a group of financial assets is impaired. For equity investments, we make all subsequent measurements at fair value. For debt instruments carried at amortized cost and at fair value through other comprehensive income, we assess on a forward-looking basis the expected credit losses, using methods that depend on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, we apply the simplified approach, which requires the expected lifetime credit losses to be recognized from the initial recognition of the receivable.

The provision for impairment for financial assets are based on assumptions about risk of default and expected loss rates. Significant management judgment is involved in making these assumptions and selecting the inputs to the impairment calculation based on our past history, existing market conditions as well as forward looking estimates at the end of each reporting period. Such assumptions and estimates can be impacted by many factors, such as the financial condition, earnings capacity and near-term prospects of the company in which we have invested, breach of contract such as default or delinquency in payments, disappearance of an active market for the financial asset and other adverse changes in the payment status of borrowers in the portfolio. The evaluation of these investments is also subject to the overall condition of the economy and its impact on the capital markets.

Income Taxes

We are required to estimate the amount of tax payable or refundable for the current year and the deferred income tax liabilities and assets for the future tax consequences of events that have been reflected in our financial statements or tax returns. This process requires management to make assessments regarding the timing and probability of the tax impact. Actual income taxes could vary from these estimates due to future changes in income tax law or unpredicted results from the final determination of each year’s liability by taxing authorities.

We believe that the accounting estimate related to assessing the realizability of deferred tax assets is a “critical accounting estimate” because: (1) it requires management to make assessments about the timing of future events, including the probability of expected future taxable income and available tax planning opportunities, and (2) the impact that changes in actual performance versus these estimates could have on the realization of tax benefits as reported in our results of operations could be material. Management’s assumptions require significant judgment because actual performance has fluctuated in the past and may continue to do so.

Post-employment Benefit Liabilities

Our accounting of post-employment benefits, which mainly consist of a defined benefit plan (we began offering a defined contribution plan in December 2012), involves judgments about uncertain events including discount rates, life expectancy and future pay inflation. Any changes in these assumptions will impact the carrying amount of the defined benefit liability. The discount rates used to determine the present value of estimated future cash outflows expected to be required to settle the defined benefit liability, are determined at the end of each reporting period by reference to the yield at

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the reporting date on high-quality corporate bonds that have maturity dates approximating the terms of our benefits obligations and that are denominated in the same currency in which the benefits are expected to be paid. Other key assumptions for defined benefit liability are based in part on current market conditions. For defined contribution plans, we pay contributions to publicly or privately administered pension insurance plans on a mandatory, contractual or voluntary basis, and we have no further payment obligations once the contributions have been paid.

Provisions

We recognize provisions at the end of the reporting period when we have a present legal or constructive obligation, such as litigation or assets retirement obligations, as a result of past events and an outflow of resources required to settle the obligation is probable and can be reliably estimated. We measure provisions at the present value of the expenditures expected to be required to settle the obligation, which are estimated based on factors such as historical experience. We do not recognize provisions for future operating losses and recognize as interest expense any increase in the provisions due to passage of time. See Notes 2.22, 3.7 and 17 to the Consolidated Financial Statements.

Explanatory Note Regarding Presentation of Certain Financial Information under K-IFRS

In addition to preparing financial statements in accordance with IFRS as issued by the IASB included in this annual report, we prepare financial statements in accordance with K-IFRS, which we are required to file with the Financial Services Commission and the Korea Exchange under the FSCMA.

K-IFRS differs in certain respects from IFRS as issued by the IASB in the presentation of operating profit. Additionally, under K-IFRS, revenue from the development and sale of real estate is recognized using the percentage of completion method. However, under IFRS as issued by the IASB, revenue from the development and sale of real estate is recognized when an individual unit of residential real estate is delivered to the buyer. Primarily due to such differences, our consolidated statements of comprehensive income and our consolidated statements of financial position prepared in accordance with IFRS as issued by the IASB included in this annual report differ from our consolidated statements of comprehensive income and consolidated statements of financial position prepared in accordance with K-IFRS.

The table below sets forth a reconciliation of our operating profit and net income or loss as presented in our consolidated statements of operations prepared in accordance with IFRS as issued by the IASB for each of the years ended December 31, 2016, 2017 and 2018 to our operating profit and net income or loss in our consolidated statements of operations prepared in accordance with K-IFRS, for each of the corresponding years, taking into account such differences:

	For the Year Ended December 31,
	2016		2017		2018
	(In millions of Won)
Operating profit under IFRS as issued by the IASB	￦	1,383,104	￦	1,069,092	￦	1,100,860
Effect of changes in operating income presentation		96,602		286,161		103,897
Revenue recognition of development and sale of real estate		3,597		20,033		56,765
Operating profit under K-IFRS	￦	1,483,303	￦	1,375,286	￦	1,261,522

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	For the Year Ended December 31,
	2016			2017			2018
	(In millions of Won)
Net income under IFRS as issued by the IASB	￦	831,845		￦	546,341		￦	719,412
Profit before income tax
Revenue recognition of development and sale of real estate		3,597			20,033			56,765
Income tax		(870	)		(4,848	)		(13,872	)
Net income under K-IFRS	￦	834,572		￦	561,526		￦	762,305

Adoption of IFRS 15

The IASB issued IFRS 15 Revenue from Contracts with Customers (“IFRS 15”) for recognizing revenue. IFRS 15 establishes a five-step model that applies to operating revenue earned from a contract with a customer, regardless of the type of revenue transaction or the industry with limited exceptions. We mainly provide telecommunications services and sell handsets, and revenue from such services provided is recognized over time and revenue from such sale of goods is recognized at a point in time. We have adopted IFRS 15 from January 1, 2018 and applied the modified retrospective approach, and recognized the cumulative impact of initially applying the revenue standard as an adjustment to retained earnings as of January 1, 2018, the period of initial application. Accordingly, the financial information related to periods prior to January 1, 2018 have not been restated for the adoption of IFRS 15 and continue to be presented under IAS 18 Revenue and other standards (collectively, “IAS 18 and Other Standards”).

The adjustments made to line items presented in the consolidated statements of comprehensive income for the year ended December 31, 2018 due to the change from IAS 18 and Other Standards applied previously to IFRS 15 are as follows:

	For the year ended December 31,
	2018 (under IFRS 15)			Adjustments			2018 (under IAS 18 and Other Standards)
	(In billions of Won)
Operating revenue	￦	23,436		￦	268		￦	23,704
Operating expenses		22,335			316			22,651
Operating profit		1,101			(48	)		1,053
Financial income		374			(4	)		370
Financial costs		436			17			453
Share of net losses of associates and joint venture		(5	)		—			(5	)
Profit before income tax		1,034			(69	)		965
Income tax expense		315			(18	)		297
Profit for the year	￦	719		￦	(51	)	￦	668

For a discussion of the adoption of IFRS 15 and the adjustments made to line items presented in the consolidated interim financial statements due to the change from IAS 18 and Other Standards applied previously to IFRS 15, including the impact on the line items in the consolidated statements of financial position and consolidated statement of comprehensive income, see Notes 2.2 and 41(1) of the notes to the Consolidated Financial Statements.

Recent Accounting Pronouncements under IFRS

For a summary of new standards, amendments and interpretations issued under IFRS as issued by the IASB but not effective for 2018, and which have not been adopted early by us, see Note 2.2 to the Consolidated Financial Statements.

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Operating Revenue and Operating Expenses

Operating Revenue

Our operating revenue primarily consists of:

• fees related to our mobile services, including monthly fees, usage charges for outgoing calls, usage charges for wireless data transmission, contents download fees, mobile-to-mobile interconnection revenue and value-added monthly service fees;

• fees from our fixed-line services, including:

Ø fees from our fixed-line and VoIP telephone services, which include:

Ø monthly basic charges, which are one-time or monthly fixed charges primarily consisting of (i) non-refundable activation fees; and (ii) monthly fixed charges from local telephone services (or monthly fixed charges for discount plans);

Ø monthly usage charges, which are usage fees based on the amount of services used, primarily consisting of (i) monthly usage charges for local telephone and domestic long distance services; (ii) international long-distance service revenue, (primarily (a) amounts we bill to our customers for outgoing calls made to foreign countries, (b) amounts we bill to foreign telecommunications carriers for connection to the domestic telephone network in respect of incoming calls at the applicable settlement rate, and (c) other revenue, including revenue from international leased lines); (iii) land-to-mobile and land-to-land interconnection revenue; and (iv) interconnection fees we charge to fixed-line and mobile service providers and voice resellers for their use of our local, domestic long-distance and international networks in providing their services; and

Ø other revenue from (i) value-added services, local telephone directory assistance, call waiting and caller identification services; and (ii) local, domestic long-distance and international calls placed from public telephones.

Ø broadband Internet access service revenue, primarily consisting of installation fees and basic monthly charges; and

Ø data communication service revenue, primarily consisting of installation fees and basic monthly charges for our fixed-line and satellite leased line services and Kornet Internet connection service;

• revenue from media and content services, primarily consisting of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from TV home shopping, digital content distribution, ICT platform consulting, digital music streaming and downloading and online advertising;

• financial service revenue, primarily consisting of fees from credit card services provided by BC Card, our consolidated subsidiary in which we hold a 69.54% interest;

• revenue from our miscellaneous business activities that extend beyond telecommunications and financial services, including information technology and network services and rental of real estate; and

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• revenue from sale of goods, primarily handsets related to our mobile services and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

Operating Expenses

Our operating expenses primarily include:

• purchase of inventories, primarily consisting of (i) inventories purchased for our sale of mobile handsets and (ii) development expenses of KT Estate for real estate units to be sold, and changes of inventories, which reflects increases or decreases of inventories of handsets, phones and for-sale real estate units during the applicable period;

• salaries and wages, including post-employment benefits, termination benefits (including severance benefits for voluntary and special early retirements) and share-based payments;

• card service costs, primarily consisting of costs in connection with credit and cash card services provided by BC Card, including fees paid to member credit card companies in our network for marketing expenses;

• depreciation expenses incurred primarily in connection with our telecommunications network facilities;

• sales commissions, primarily consisting of sales commissions to third-party dealers related to procurement of mobile subscribers and mobile handset sales;

• service cost, primarily consisting of payments to IPTV and satellite TV content providers;

• commissions, primarily consisting of commission-based payments for certain third-party outsourcing services, including commissions to the outsourced call center staff;

• amortization expenses incurred primarily in connection with our intangible assets; and

• interconnection charges, which are interconnection payments to telecommunication service providers for calls from landline users and our mobile subscribers to our competitors’ subscribers.

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Operating Results—2017 Compared to 2018

The following table presents selected income statement data and changes therein for 2017 and 2018:

	For the Year Ended December 31,						Changes
							2017 vs. 2018
	2017			2018			Amount			%
	(In billions of Won)
Operating revenue	￦	23,547		￦	23,436		￦	(111	)		(0.5	)%
Operating expenses		22,478			22,335			(143	)		(0.6	)
Operating profit		1,069			1,101			32			3.0
Finance income		406			374			(32	)		(7.9	)
Finance costs		645			436			(209	)		(32.4	)
Share of net profits of associates and joint venture		(14	)		(5	)		8			(60.6	)
Profit before income tax		817			1,034			217			26.6
Income tax expense		271			315			44			16.2
Profit for the year	￦	546		￦	719		￦	173			31.7	%

Operating Revenue

The following table presents a breakdown of our operating revenue and changes therein for 2017 and 2018:

	For the Year Ended December 31,				Changes
					2017 vs. 2018
Products and services	2017		2018		Amount			%
	(In billions of Won)
Mobile services	￦	7,122	￦	6,828	￦	(294	)		(4.1	)%
Fixed-line services:
Fixed-line and VoIP telephone services		1,834		1,708		(126	)		(6.9	)
Broadband Internet access services		2,082		2,113		31			1.5
Data communication services		1,066		1,048		(18	)		(1.7	)
Sub-total		4,982		4,869		(113	)		(2.3	)
Media and content		2,814		3,182		368			13.1
Financial services		3,443		3,445		2			0.1
Others		1,825		1,823		(2	)		(0.1	)
Sale of goods (1)		3,361		3,289		(72	)		(2.1	)
Total operating revenue	￦	23,547	￦	23,436	￦	(111	)		(0.5	)%

(1) Primarily related to sale of handsets for our mobile service and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

Total operating revenue decreased by 0.5%, or ￦111 billion, from ￦23,547 billion in 2017 to ￦23,436 billion in 2018, primarily due to decreases in revenue from mobile services, fixed-line services and sale of goods, which impacts were partially offset by an increase in revenue from media and content. Our operating revenue was also negatively impacted by our adoption of IFRS 15 starting on January 1, 2018 using the modified retrospective method. See “—Adoption of IFRS 15” and Note 41(1) of the notes to our consolidated financial statements. In 2018, our operating revenue was ￦23,436 billion under IFRS 15, compared to ￦23,704 billion under IAS 18 and Other Standards. Had we continued to apply the previous method of IAS 18 and Other Standards in 2018, our operating revenue would have increased by 0.7%, or ￦157 billion, from ￦23,547 billion in 2017 to ￦23,704 billion in 2018.

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Mobile Services

Our mobile services revenue decreased by 4.1%, or ￦294 billion, from ￦7,122 billion in 2017 to ￦6,828 billion in 2018, primarily due to a decrease in our average revenue per user, which impact was partially offset by an increase in our mobile subscribers.

Our average revenue per user decreased from ￦34,444 in 2017 to ￦32,021 in 2018 mainly due to the increase in the maximum discount rate we provide to mobile subscribers who elect to receive subscription rate discounts in lieu of handset subsidies from 20.0% to 25.0%, a substantial portion of our new mobile subscribers having elected to receive such subscription rate discounts in lieu of handset subsidies, as well as less costly plans for their second devices and the impact of our adoption of IFRS 15 starting on January 1, 2018.

We recorded a 5.5% increase in our mobile subscribers from approximately 20.0 million as of December 31, 2017 to approximately 21.1 million as of December 31, 2018.

Fixed-line Services

Our fixed-line services revenue decreased by 2.3%, or ￦113 billion, from ￦4,982 billion in 2017 to ￦4,869 billion in 2018, primarily due to decreases in our revenue from fixed-line and VoIP telephone services and data communication services, which impacts were partially offset by an increase in revenue from broadband Internet access services.

Fixed-line and VoIP Telephone Services. Our fixed-line and VoIP telephone services revenue decreased by 6.9%, or ￦126 billion, from ￦1,834 billion in 2017 to ￦1,708 billion in 2018, primarily due to decreases in monthly usage charges and subscribers as well as a continued decrease in demand for such services, which were partially offset by an increase in monthly basic charges. Our domestic long-distance call minutes decreased from 1.1 billion in 2017 to 0.9 billion in 2018 and local call pulses from 1.3 billion in 2017 to 1.0 billion in 2018, while the number of PSTN and VoIP lines in service decreased from 15.6 million as of December 31, 2017 to 15.0 million as of December 31, 2018. Partially offsetting such trends, our monthly basic charges increased primarily due to an increase in subscribers of our unlimited fixed-line telephone service plan in 2018 which offers unlimited call minutes for fixed monthly basic charges.

Broadband Internet Access Services. Our broadband Internet access services revenue increased by 1.5%, or ￦31 billion, from ￦2,082 billion in 2017 to ￦2,113 billion in 2018, primarily as a result of an increase in the number of subscribers to our premium services, which was partially offset by our adoption of IFRS 15 starting on January 1, 2018. The number of our KT GiGA Internet service subscribers increased from approximately 3.9 million as of December 31, 2017 to approximately 4.9 million as of December 31, 2018.

Data Communication Services. Our data communication services revenue decreased by 1.7%, or ￦18 billion, from ￦1,066 billion in 2017 to ￦1,048 billion in 2018 primarily due to increases in market competition based on pricing as well as discounts provided to our long-term customers.

Media and Content

Our media and content revenue increased by 13.1%, or ￦368 billion, from ￦2,814 billion in 2017 to ￦3,182 billion in 2018, primarily due to an increase in the number of IPTV subscribers from approximately 7.5 million as of December 31, 2017 to approximately 7.9 million as of December 31, 2018 as well as increases in revenues generated from Genie Music Corporation and KTH, which impacts were partially offset by a decrease in revenue from our joint ventures as well as the negative impact on media and content revenue from our adoption of IFRS 15 starting on January 1, 2018.

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Financial Services

Financial services revenue remained stable and increased slightly by 0.1%, or ￦2 billion, from ￦3,443 billion in 2017 to ￦3,445 billion in 2018.

Others

Other operating revenue remained stable and decreased slightly by 0.1%, or ￦2 billion, from ￦1,825 billion in 2017 to ￦1,823 billion in 2018, reflecting decreases in revenue from our miscellaneous services, which impact was partially offset by an increase in revenue from our information technology and network services.

Sale of Goods

Revenue from sale of goods decreased by 2.1%, or ￦72 billion, from ￦3,361 billion in 2017 to ￦3,289 billion in 2018, primarily due to the negative impact on sale of goods revenue from our adoption of IFRS 15 starting on January 1, 2018 as well as a decrease in revenue from sales of miscellaneous telecommunications equipment, which impacts were partially offset by an increase in revenue from sales of mobile handsets in 2018 compared to 2017. The sale of mobile handsets in 2018 increased largely due to increases in the number of handset units sold and, to a lesser extent, the per-unit price of premium handsets.

Operating Expenses

The following table presents a breakdown of our operating expenses and changes therein for 2017 and 2018:

	For the Year Ended December 31,						Changes
							2017 vs. 2018
	2017			2018			Amount			%
	(In billions of Won)
Salaries and wages	￦	3,568		￦	3,846		￦	277			7.8	%
Depreciation		2,746			2,674			(72	)		(2.6	)
Amortization of intangible assets		619			608			(11	)		(1.8	)
Commissions		1,086			1,080			(6	)		(0.5	)
Interconnection charges		641			580			(61	)		(9.5	)
International interconnection fee		214			227			13			5.9
Purchase of inventories		4,054			4,414			360			8.9
Changes of inventories		(187	)		(433	)		(246	)		131.6
Sales commission		2,202			1,943			(259	)		(11.8	)
Service cost		1,428			1,541			112			7.9
Utilities		323			323			0			0.0
Taxes and dues		280			285			6			2.0
Rental		449			460			12			2.6
Insurance premium		69			74			4			6.2
Installation fee		147			144			(3	)		(2.1	)
Advertising expenses		197			158			(39	)		(20.0	)
Research and development expenses		169			177			8			4.8
Card service costs		3,095			3,113			18			0.6
Others		1,379			1,123			(257	)		(18.6	)
Total operating expenses	￦	22,478		￦	22,335		￦	(143	)		(0.6	)%

Total operating expenses decreased by 0.6%, or ￦143 billion, from ￦22,478 billion in 2017 to ￦22,335 billion in 2018 primarily due to decreases in sales commissions, other expenses and changes of inventories, the impacts of which were partially offset by increases in purchase of inventories,

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salaries and wages and service cost. Our operating expenses were also negatively impacted by our adoption of IFRS 15 starting on January 1, 2018 using the modified retrospective method. See “—Adoption of IFRS 15” and Note 41(1) of the notes to our consolidated financial statements. In 2018, our operating expenses were ￦22,335 billion under IFRS 15, compared to ￦22,651 billion under IAS 18 and Other Standards. Had we continued to apply the previous method of IAS 18 and Other Standards in 2018, our operating expenses would have increased by 0.8%, or ￦174 billion, from ￦22,478 billion in 2017 to ￦22,651 billion in 2018. Specifically:

• Sales commission decreased by 11.8%, or ￦259 billion, from ￦2,202 billion in 2017 to ￦1,943 billion in 2018 primarily due to the impact of our adoption of IFRS 15 starting in 2018, which was partially offset by an increase in sales commissions that we paid to third-party dealers for procurement of mobile subscribers and handsets in 2018 compared to 2017.

• Other expenses decreased by 18.6%, or ￦257 billion, from ￦1,379 billion in 2017 to ￦1,123 billion in 2018 primarily due to a loss on disposal of certain telecommunications assets in 2017, which did not occur in 2018.

• Changes of inventories, which reflect inventory changes during a period by calculating inventories at the beginning of the period minus those at the end of the period, increased by 131.6%, or ￦246 billion, from ￦(187) billion in 2017 to ￦(433) billion in 2018, which indicates increases in inventories by ￦187 billion in 2017 and an additional ￦433 billion in 2018. This was primarily due to an increase in our purchase of mobile handsets in 2018 compared to 2017 as described below, which was partially offset by an increase in the sale of mobile handsets in 2018 compared to 2017.

These factors were partially offset by the following:

• Our purchase of inventories increased by 8.9%, or ￦360 billion, from ￦4,054 billion in 2017 to ￦4,414 billion in 2018 primarily due to an increase in purchase of mobile handsets (consisting of an increase in the total number of mobile handsets (mostly smartphones) purchased and an increase in the per-unit price of handsets).

• Salaries and wages increased by 7.8%, or ￦277 billion, from ￦3,568 billion in 2017 to ￦3,846 billion in 2018 primarily due to an increase in wages as well as payments of special incentive bonuses to our employees.

• Service cost increased by 7.9%, or ￦112 billion, from ￦1,428 billion in 2017 to ￦1,541 billion in 2018, primarily due to increases in content costs relating to our IPTV and satellite TV services.

Operating Profit

Due to the factors described above, our operating profit increased by 3.0%, or ￦32 billion, from ￦1,069 billion in 2017 to ￦1,101 billion in 2018. Our operating margin, which is operating profit as a percentage of operating revenue, was 4.5% in 2017 and 4.7% in 2018.

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Finance Income (Costs)

The following table presents a breakdown of our finance income and costs and changes therein for 2017 and 2018:

	For the Year Ended December 31,				Changes
					2017 vs. 2018
	2017		2018		Amount			%
	(In billions of Won)
Interest income	￦	93	￦	245	￦	152			163.0	%
Gain on foreign currency transactions		80		17		(62	)		(78.4	)
Gain on foreign currency translation		226		4		(222	)		(98.4	)
Gain on settlement of derivatives		—		28		28			N.A.
Gain on valuation of derivatives		0		66		66			N.M.
Others		8		14		6			80.0
Total finance income	￦	406	￦	374	￦	(32	)		(7.9	)
Interest expenses	￦	302	￦	297	￦	(6	)		(1.8	)%
Loss on foreign currency transactions		40		49		9			22.0
Loss on foreign currency translation		12		73		60			493.5
Loss on settlement of derivatives		59		—		(59	)		(100.0	)
Loss on valuation of derivatives		210		2		(208	)		(99.0	)
Loss on disposal of trade receivables		20		14		(7	)		(32.1	)
Impairment loss on available-for-sale financial assets		0		—		(0	)		(100.0	)
Others		1		1		0			11.4
Total finance costs	￦	645	￦	436	￦	(209	)		(32.4	)

N.A. means not applicable.

N.M. means not meaningful.

Our interest income increased by 163.0%, or ￦152 billion, from ￦93 billion in 2017 to ￦245 billion in 2018. In 2018, we recognized interest income related to a delay in VAT refund, compared to no such income recognized in 2017. In addition, a general increase in interest rates in Korea in 2018 contributed to the increase in interest income in 2018 compared to 2017.

We recognized a net gain on foreign currency translation of ￦214 billion in 2017 compared to a net loss of ￦69 billion in 2018, and we recognized a net gain on foreign currency transactions of ￦40 billion in 2017 compared to a net loss of ￦32 billion in 2018, as the Won appreciated against the Dollar in 2017 but depreciated in 2018. In terms of the market average exchange rates announced by Seoul Money Brokerage Services, Ltd., the Won appreciated from ￦1,208.5 to US$1.00 as of December 31, 2016 to ￦1,071.4 to US$1.00 as of December 31, 2017 but depreciated to ￦1,118.1 to US$1.00 as of December 31, 2018. Against such fluctuations, we recognized a net loss on valuation of derivatives of ￦210 billion in 2017 compared to a net gain of ￦64 billion in 2018 and recorded a net loss on transactions of derivatives of ￦59 billion in 2017 compared to a net gain of ￦28 billion in 2018.

Share of Net Profits (Losses) of Associates and Joint Venture

Our share of net losses of associates and joint ventures decreased by 60.6%, or ￦8 billion, from ￦14 billion in 2017 to ￦5 billion in 2018. In 2017, our share of net losses of associates and joint ventures consisted primarily of our share of loss from K Bank of Won 17 billion. In 2018, our share of loss from K Bank increased to Won 20 billion, which was partially offset by our share of profit from Korea Information & Technology Fund of Won 15 billion.

Income Tax Expense

Income tax expense increased by 16.2%, or ￦44 billion, from ￦271 billion in 2017 to ￦315 billion in 2018, primarily due to an increase in profit before income tax, which increased by

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26.6%, or ￦217 billion, from ￦817 billion in 2017 to ￦1,034 billion in 2018. See Note 29 to the Consolidated Financial Statements.

Profit for the Year

Due to the factors described above, our profit for the year increased by 31.7%, or ￦173 billion, from ￦546 billion in 2017 to ￦719 billion in 2018. Our net profit margin, which is net profit for the year as a percentage of operating revenue, was 2.3% in 2017 and 3.1% in 2018.

Segment Results—Marketing/Customer

Our operating revenue for the marketing/customer segment, prior to adjusting for inter-segment transactions, decreased by 13.4%, or ￦2,181 billion, from ￦16,243 billion in 2017 to ￦14,062 billion in 2018 primarily due to our decision to separate the marketing/customer segment into two separate reported segments of the marketing/customer segment and the corporate customer businesses segment starting in 2018 and, to a lesser extent, the impact of our adoption of IFRS 15 starting on January 1, 2018. In addition to such impacts, our operating revenue of the marketing/customer segment was negatively impacted by decreases in revenue from our mobile services and fixed-line services to individual and household customers, which were partially offset by an increase in revenue from our media and content services to individual and household customers, as described above.

Our operating income for the marketing/customer segment, prior to adjusting for inter-segment transactions, decreased by 13.0%, or ￦132 billion, from ￦1,019 billion in 2017 to ￦887 billion in 2018, as the ￦2,181 billion decrease in the segment’s operating revenue outpaced the ￦2,049 billion decrease in operating expenses. For this segment, operating margin, which is operating income as a percentage of total operating revenue prior to adjusting for inter-segment transactions, remained constant at 6.3% in 2017 and 2018.

Our depreciation and amortization for the marketing/customer segment, prior to adjusting for inter-segment transactions, decreased by 20.8%, or ￦602 billion, from ￦2,896 billion in 2017 to ￦2,294 billion in 2018.

Segment Results—Corporate Customer Businesses

Our operating revenue for the newly reported corporate customer businesses segment, prior to adjusting for inter-segment transactions, was ￦2,510 billion in 2018. The segment’s operating income was ￦209 billion in 2018, and its operating margin was 8.3% in 2018. The segment’s depreciation and amortization was ￦547 billion in 2018.

Segment Results—Finance

Our operating revenue for the finance segment, prior to adjusting for inter-segment transactions, decreased by 2.1%, or ￦78 billion, from ￦3,638 billion in 2017 to ￦3,560 billion in 2018 primarily due to the reasons described above.

Our operating income for the finance segment, prior to adjusting for inter-segment transactions, decreased by 29.3%, or ￦60 billion, from ￦206 billion in 2017 to ￦145 billion in 2018, as the ￦78 billion decrease in the segment’s operating revenue outpaced the ￦17 billion decrease in operating expenses. For this segment, operating margin decreased from 5.7% in 2017 to 4.1% in 2018.

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Depreciation and amortization for the finance segment, prior to adjusting for inter-segment transactions, decreased by 21.9%, or ￦6 million, from ￦29 billion in 2017 to ￦23 billion in 2018.

Segment Results—Satellite TV

Our operating revenue for the satellite TV segment, prior to adjusting for inter-segment transactions, remained relatively unchanged, increasing by 0.7%, or ￦5 billion, from ￦686 billion in 2017 to ￦691 billion in 2018.

Our operating income for the satellite TV segment, prior to adjusting for inter-segment transactions, decreased by 11.5%, or ￦9 billion, from ￦75 billion in 2017 to ￦67 billion in 2018, as the ￦14 billion increase in the segment’s operating expenses outpaced the ￦5 billion increase in operating revenue. Operating margin for this segment decreased from 11.0% in 2017 to 9.7% in 2018.

Depreciation and amortization for the satellite TV segment, prior to adjusting for inter-segment transactions, decreased by 0.9%, or ￦1 billion, from ￦99 billion in 2017 to ￦98 billion in 2018.

Segment Results—Others

Our operating revenue for the others segment, prior to adjusting for inter-segment transactions, decreased by 4.5%, or ￦302 billion, from ￦6,652 billion in 2017 to ￦6,350 billion in 2018, primarily due to a decrease in revenue from sale of real estate developed by KT Estate, which was partially offset by an increase in revenue from sale of handsets.

Our operating loss for the others segment, prior to adjusting for inter-segment transactions, decreased by 17.6%, or ￦33 billion, from ￦187 billion in 2017 to ￦154 billion in 2018, as the ￦335 billion decrease in the segment’s operating expenses outpaced the ￦302 billion decrease in operating revenue. Operating loss margin for this segment decreased from (2.8)% in 2017 to (2.4)% in 2018.

Depreciation and amortization for this segment, prior to adjusting for inter-segment transactions, decreased by 5.6%, or ￦19 billion, from ￦332 billion in 2017 to ￦314 billion in 2018.

Operating Results—2016 Compared to 2017

The following table presents selected income statement data and changes therein for 2016 and 2017:

	For the Year Ended December 31,					Changes
						2016 vs. 2017
	2016		2017			Amount			%
	(In billions of Won)
Operating revenue	￦	23,164	￦	23,547		￦	383			1.7	%
Operating expenses		21,781		22,478			697			3.2
Operating profit (loss)		1,383		1,069			(314	)		22.7
Finance income		296		406			110			37.2
Finance costs		515		645			130			25.2
Share of net profits of associates and joint ventures		3		(14	)		(17	)		N.M.
Profit (loss) from continuing operations before income tax		1,167		817			(350	)		(30.0	)
Income tax expense (benefit)		335		271			(64	)		(19.2	)
Profit for the year	￦	832	￦	546		￦	(286	)		(34.3	)%

N.M. means not meaningful.

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Operating Revenue

The following table presents a breakdown of our operating revenue and changes therein for 2016 and 2017:

	For the Year Ended December 31,				Changes
					2016 vs. 2017
Products and services	2016		2017		Amount			%
	(In billions of Won)
Mobile services	￦	7,375	￦	7,122	￦	(253	)		(3.4	)%
Fixed-line services:
Fixed-line and VoIP telephone services		2,053		1,834		(219	)		(10.7	)
Internet services:
Broadband Internet access services		2,040		2,082		42			2.1
Other Internet-related services (1)		1,799		2,139		340			18.9
Data communication services		1,025		1,066		41			4.0
Sub-total		6,917		7,121		204			2.9
Financial services		3,428		3,443		15			0.4
Others		2,592		2,500		(92	)		(3.5	)
Sale of goods (2)		2,852		3,361		509			17.8
Total operating revenue	￦	23,164	￦	23,547	￦	383			1.7	%

(1) Primarily related to revenue from IPTV services.

(2) Primarily related to sale of handsets for our mobile service and miscellaneous telecommunications equipment, as well as sale of residential units and commercial real estate developed by KT Estate.

Total operating revenue increased by 1.7%, or ￦383 billion, from ￦23,164 billion in 2016 to ￦23,547 billion in 2017 primarily due to increases in the revenue from sale of goods and our Internet services, the impact of which was partially offset in part by decreases in the revenue from our mobile services and fixed-line and VoIP telephone services.

Mobile Services

Our mobile services revenue decreased by 3.4%, or ￦253 billion, from ￦7,375 billion in 2016 to ￦7,122 billion in 2017 primarily due to a decrease in our average revenue per user, which impact was partially offset by an increase in our mobile subscribers.

Our average revenue per user decreased from ￦35,768 in 2016 to ￦34,444 in 2017 mainly due to a substantial portion of our new mobile subscribers having elected to receive subscription rate discounts in lieu of handset subsidies. In addition, our average revenue per user was negatively impacted by an increase in the maximum discount rate applicable to mobile subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017.

We recorded a 5.9% increase in our mobile subscribers from approximately 18.9 million as of December 31, 2016 to approximately 20.0 million as of December 31, 2017.

Fixed-line Services

Our fixed-line services revenue in the aggregate increased by 2.9%, or ￦204 billion, from ￦6,917 billion in 2016 to ￦7,121 billion in 2017 primarily due to increases in Internet services revenue and data communication services revenue, the impact of which was partially offset by a decrease in our fixed-line and VoIP telephone services revenue.

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Fixed-line and VoIP Telephone Services. Our fixed-line and VoIP telephone services revenue decreased by 10.7%, or ￦219 billion, from ￦2,053 billion in 2016 to ￦1,834 billion in 2017 primarily due to decreases in monthly usage charges as well as in our subscribers of fixed-line telephone services reflecting a continued decrease in demand for such services, which was partially offset by an increase in monthly basic charges. Our domestic long-distance call minutes decreased from 1.5 billion in 2016 to 1.1 billion in 2017 and local call pulses from 2.2 billion in 2016 to 1.3 billion in 2017, while the number of PSTN and VoIP lines in service decreased from 16.3 million as of December 31, 2016 to 15.6 million as of December 31, 2017. Partially offsetting such trends, our monthly basic charges increased primarily due to an increase in subscribers of our unlimited fixed-line telephone service plan in 2017 which offers unlimited call minutes for fixed monthly basic charges.

Internet Services. Our Internet services revenue, which primarily consists of revenue from IPTV and broadband Internet access services, increased by 10.0%, or ￦382 billion, from ￦3,839 billion in 2016 to ￦4,221 billion in 2017 primarily due to an increase in the number of IPTV subscribers from approximately 7.0 million as of December 31, 2016 to approximately 7.5 million as of December 31, 2017, as well as an increase in the number of our subscribers of premium broadband Internet access services. The number of our KT GiGA Internet service subscribers increased from approximately 2.4 million as of December 31, 2016 to approximately 3.9 million as of December 31, 2017.

Data Communication Services. Our data communication services revenue increased by 4.0%, or ￦41 billion, from ￦1,025 billion in 2016 to ￦1,066 billion in 2017 primarily due to an increase in revenue from our co-location and server leasing services offered to corporate customers.

Financial Services

Financial services revenue increased by 0.4%, or ￦15 billion, from ￦3,428 billion in 2016 to ￦3,443 billion in 2017 primarily due to the sale of BC Card’s ownership interest in MasterCard and an increase in commission revenue from BC Card reflecting an expansion of its merchant payment network, which impacts were partially offset by a decrease in the transaction volume of foreign credit cards processed through BC Card that were used by Chinese tourists visiting Korea in 2017 as compared to 2016.

Others

Other operating revenue decreased by 3.5%, or ￦92 billion, from ￦2,592 billion in 2016 to ￦2,500 billion in 2017 primarily due to a decrease in revenue from our systems integration business.

Sale of Goods

Revenue from sale of goods increased by 17.8%, or ￦509 billion, from ￦2,852 billion in 2016 to ￦3,361 billion in 2017 primarily due to an increase in the sale of mobile handsets in 2017 compared to 2016 and, to a lesser extent, an increase in revenue from the sale of real estate developed by KT Estate. The sale of mobile handsets in 2017 increased largely due to increases in the number of handset units sold and, to a lesser extent, the per-unit price of premium handsets.

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Operating Expenses

The following table presents a breakdown of our operating expenses and changes therein for 2016 and 2017:

	For the Year Ended December 31,					Changes
						2016 vs. 2017
	2016		2017			Amount			%
	(In billions of Won)
Salaries and wages	￦	3,478	￦	3,568		￦	90			2.6	%
Depreciation		2,763		2,746			(17	)		(0.6	)
Commissions		1,099		1,086			(14	)		(1.2	)
Interconnection charges		690		641			(50	)		(7.2	)
Purchase of inventories		3,407		4,054			646			19.0
Changes of inventories		162		(187	)		(350	)		N.M.
Sales commission		1,968		2,202			234			11.9
Service cost		1,322		1,428			106			8.0
Card service costs		3,050		3,095			45			1.5
Insurance premium		178		69			(109	)		(61.1	)
Others (1)		3,663		3,777			113			3.1
Total operating expenses	￦	21,781	￦	22,478		￦	697			3.2	%

N.M. means not meaningful.

(1) Including other operating expenses (which include other expenses) amortization of intangible assets, rent, utilities, international interconnection fee, installation fee, taxes and dues, research and development expenses and advertising expenses.

Total operating expenses increased by 3.2%, or ￦697 billion, from ￦21,781 billion in 2016 to ￦22,478 billion in 2017 primarily due to increases in purchase of inventories, sales commission and service cost, the impact of which was partially offset by decreases in changes of inventories and insurance premium as described below. Specifically:

• Purchase of inventories increased by 19.0%, or ￦646 billion, from ￦3,407 billion in 2016 to ￦4,054 billion in 2017 primarily due to an increase in purchase of mobile handsets (consisting of an increase in the total number of mobile handsets (mostly smartphones) purchased and an increase in the per-unit price of mobile handsets) and, to a lesser extent, an increase in development expenses of for-sale real estate units.

• Sales commission increased by 11.9%, or ￦234 billion, from ￦1,968 billion in 2016 to ￦2,202 billion in 2017 primarily due to an increase in sales commissions that we paid to third-party dealers for procurement of mobile subscribers and mobile handset sales, both of which increased in 2017.

• Service cost increased by 8.0%, or ￦106 billion, from ￦1,322 billion in 2016 to ￦1,428 billion in 2017, primarily due to an increase in service costs relating to our IPTV and mobile services such as purchases of contents to meet increased and diversified demand from customers and an increase in installation fees as more sophisticated technologies and corresponding higher fees were required for the installation of certain new equipment and facilities.

These factors were partially offset by the following:

• Changes of inventories, which reflect inventory changes during a period by calculating inventories at the beginning of period minus those at the end of period, amounted to

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￦162 billion in 2016 and ￦(187) billion in 2017, which means inventories increased by ￦187 billion in 2017 while they decreased by ￦162 billion in 2016. This was primarily due to an increase in purchase of handsets in 2017 compared to 2016 as described above, which was partially offset by an increase in the sale of handsets in 2017 compared to 2016. Cost of sale of goods (which is the sum of changes of inventories and purchase of inventories) in 2017 increased by 8.3% to ￦3,866 billion from ￦3,570 billion in 2016, primarily reflecting an increase in handset unit sales and an increase in per-unit cost of handsets, in each case in 2017 compared to 2016. Per-unit cost of handsets increased primarily due to the higher per-unit cost of premium handsets, which was partially offset by the lower per-unit cost of second devices purchased by certain of our mobile subscribers. The increase in the handset unit sales was primarily due to the unusually lower handset unit sales in 2016 due to mechanical defects relating to the Galaxy Note 7 handset in 2016. The handset unit sales were normalized in 2017 in the absence of such one-off event.

• Insurance premium decreased by 61.1%, or ￦109 billion, from ￦178 billion in 2016 to ￦69 billion in 2017 primarily due to a decrease in insurance premium rates for our handsets.

Operating Profit

Due to the factors described above, our operating profit decreased by 22.7%, or ￦314 billion, from ￦1,383 billion in 2016 to ￦1,069 billion in 2017. Our operating margin, which is operating profit as a percentage of operating revenue, was 6.0% in 2016 and 4.5% in 2017.

Finance Income (Costs)

The following table presents a breakdown of our finance income and costs and changes therein for 2016 and 2017:

	For the Year Ended December 31,				Changes
					2016 vs. 2017
	2016		2017		Amount			%
	(In billions of Won)
Interest income	￦	116	￦	93	￦	(23	)		(19.5	)%
Gain on foreign currency transactions		25		80		55			219.7
Gain on foreign currency translation		12		226		213			1,754.3
Gain on settlement of derivatives		9		—		(9	)		(100.0	)
Gain on valuation of derivatives		109		0		(109	)		(99.9	)
Others		25		8		(17	)		(68.7	)
Total finance income	￦	296	￦	406	￦	110			37.2
Interest expenses	￦	337	￦	302	￦	(35	)		(10.3	)%
Loss on foreign currency transactions		38		40		2			6.2
Loss on foreign currency translation		122		12		(110	)		(90.0	)
Loss on settlement of derivatives		1		59		58			9,167.2
Loss on valuation of derivatives		0		210		209			N.M.
Loss on disposal of trade receivables		16		20		5			28.5
Impairment loss on available-for-sale financial assets		1		0		(1	)		(99.1	)
Others		0		1		1			146.9
Total finance costs	￦	515	￦	645	￦	130			25.2

N.M. means not meaningful.

Our interest income decreased by 19.5%, or ￦23 billion, from ￦116 billion in 2016 to ￦93 billion in 2017 primarily due to interest income recognized in 2016 related to a delay in VAT

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refund, compared to no such income recognized in 2017, as well as a general decrease in interest rates in Korea in 2017.

We recognized a net loss on foreign currency translation of ￦110 billion in 2016 compared to a net gain of ￦214 billion in 2017, and recognized a net loss on foreign currency transactions of ￦13 billion in 2016 compared to a net gain of ￦40 billion in 2017, as the Won depreciated against the Dollar in 2016 but appreciated in 2017. In terms of the market average exchange rates announced by Seoul Money Brokerage Services, Ltd., the Won depreciated from ￦1,172.0 to US$1.00 as of December 31, 2015 to ￦1,208.5 to US$1.00 as of December 31, 2016 but appreciated to ￦1,071.4 as of December 31, 2017. Against such fluctuations, we recognized a net gain on valuation of derivatives of ￦109 billion in 2016 compared to a net loss of ￦210 billion in 2017 and recognized a net gain on transactions of derivatives of ￦8 billion in 2016 compared to a net loss of ￦59 billion in 2017.

Our interest expenses decreased by 10.3%, or ￦35 billion, from ￦337 billion in 2016 to ￦302 billion in 2017 primarily due to a decrease in the aggregate amount of borrowings for which we made interest payments as well as a general decrease in interest rates in Korea in 2017.

Share of Net Profits (Losses) of Associates and Joint Ventures

We recognized share of net profits of associates and joint ventures of ￦3 billion in 2016, whereas we recognized share of net losses of associates and joint ventures of ￦14 billion in 2017.

Income Tax Expense

Income tax expense decreased by 19.2%, or ￦64 billion, from ￦335 billion in 2016 to ￦271 billion in 2017, primarily due to a decrease in profit before income tax, which decreased by ￦350 billion, from ￦1,167 billion in 2016 to ￦817 billion in 2017. See Note 29 to the Consolidated Financial Statements.

Profit for the Year

Due to the factors described above, our profit for the year decreased by 34.3%, or ￦286 billion, from ￦832 billion in 2016 to ￦546 billion in 2017. Our net profit margin, which is net profit for the year as a percentage of operating revenue, decreased from 3.6% in 2016 to 2.3% in 2017.

Segment Results—Marketing/Customer

Our operating revenue for this segment, prior to adjusting for inter-segment transactions, increased slightly by 0.3%, or ￦55 billion, from ￦16,187 billion in 2016 to ￦16,243 billion in 2017 primarily due to increases in revenue from our Internet services and data communication services, which was partially offset by decreases in revenue from our mobile services and fixed-line services, as described above.

Our operating income for this segment, prior to adjusting for inter-segment transactions, decreased by 6.8%, or ￦75 billion, from ￦1,093 billion in 2016 to ￦1,019 billion in 2017, as the ￦130 billion increase in operating expenses outpaced the ￦55 billion increase in the segment’s operating revenue. For this segment, operating margin, which is operating income as a percentage of total operating revenue prior to adjusting for inter-segment transactions, decreased from 6.8% in 2016 to 6.3% in 2017.

Depreciation and amortization, prior to adjusting for inter-segment transactions, increased by 0.9%, or ￦26 billion, from ￦2,870 billion in 2016 to ￦2,896 billion in 2017.

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Segment Results—Finance

Our operating revenue for this segment, prior to adjusting for inter-segment transactions, increased by 1.7%, or ￦60 billion, from ￦3,578 billion in 2016 to ￦3,638 billion in 2017 primarily due to an increase in commission revenue of and an increase in disposal of available-for-sale assets by BC Card, which was partially offset by decreased usage of foreign credit cards processed through BC Card, as described above.

Our operating income for this segment, prior to adjusting for inter-segment transactions, decreased by 1.4%, or ￦3 billion, from ￦209 billion in 2016 to ￦206 billion in 2017, as the ￦63 billion increase in operating expenses outpaced the ￦60 billion increase in the segment’s operating revenue. Operating margin for this segment decreased from 5.8% in 2016 to 5.7% in 2017.

Depreciation and amortization, prior to adjusting for inter-segment transactions, remained relatively stable at ￦29 billion in each of 2016 and 2017.

Segment Results—Satellite TV

Our operating revenue for this segment, prior to adjusting for inter-segment transactions, increased by 2.5%, or ￦17 billion, from ￦669 billion in 2016 to ￦686 billion in 2017, primarily due to an increase in revenue from an increase in the number of TV shopping channels and other fee-generating platforms.

Our operating income for this segment, prior to adjusting for inter-segment transactions, decreased by 5.8%, or ￦5 billion, from ￦80 billion in 2016 to ￦75 billion in 2017, as the ￦21 billion increase in operating expenses outpaced the ￦17 billion increase in the segment’s operating revenue. Operating margin for this segment decreased from 12.0% in 2016 to 11.0% in 2017.

Depreciation and amortization, prior to adjusting for inter-segment transactions, remained relatively stable at ￦99 billion in each of 2016 and 2017.

Segment Results—Others

Our operating revenue for this segment, prior to adjusting for inter-segment transactions, increased by 5.4%, or ￦343 billion, from ￦6,308 billion in 2016 to ￦6,652 billion in 2017, primarily due to an increase in sale of handsets and an increase in revenue from the development and sale of real estate by our consolidated subsidiary.

For this segment, prior to adjusting for inter-segment transactions, we recorded an operating income of ￦40 billion in 2016, compared to an operating loss of ￦187 billion in 2017, as the ￦570 billion increase in operating expenses outpaced the ￦343 billion increase in the segment’s operating revenue in 2017. For this segment, operating margin was 0.6% in 2016 and the operating loss margin (operating loss as a percentage of total operating revenue prior to adjusting for inter-segment transactions) was (2.8)% in 2017.

Depreciation and amortization, prior to adjusting for inter-segment transactions, decreased by 2.1%, or ￦7 billion, from ￦339 billion in 2017 to ￦332 billion in 2016.

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Item 5.B.  Liquidity and Capital Resources

The following table sets forth the summary of our cash flows for the years indicated:

	For the Years Ended December 31,
	2016			2017			2018
	(In billions of Won)
Net cash inflow from operating activities	￦	4,771		￦	3,878		￦	4,010
Net cash outflow from investing activities		(3,485	)		(3,483	)		(2,704	)
Net cash outflow from financing activities		(943	)		(1,363	)		(532	)
Cash and cash equivalents at beginning of the year		2,559			2,900			1,928
Cash and cash equivalents at end of the year		2,900			1,928			2,703
Net increase (decrease) in cash and cash equivalents		341			(972	)		775

Capital Requirements

Historically, our capital requirements consisted principally of purchases of property and equipment and other assets and repayments of borrowings. In our investing activities, we used cash of ￦2,764 billion in 2016, ￦2,442 billion in 2017 and ￦2,261 billion in 2018 for the acquisition of property and equipment and investment properties. In our financing activities, we used cash of ￦1,769 billion in 2016, ￦1,780 billion in 2017 and ￦1,613 billion in 2018 for repayments of borrowings and debentures. From time to time, we may also require capital for investments involving acquisitions, including shares of our affiliates, and strategic relationships.

Our cash dividends paid to shareholders and non-controlling interests amounted to ￦184 billion in 2016, ￦243 billion in 2017 and ￦299 billion in 2018.

We anticipate that capital expenditures and repayment of outstanding contractual obligations and commitments will represent the most significant use of funds for the next several years. We may also require capital for purchase of shares of our affiliates as well as investments involving acquisitions and strategic relationships. We compete primarily in the telecommunications and Internet-related markets in Korea, which are rapidly evolving. In recent years, competition among us, SK Telecom and LG U+ to commercialize 5G mobile services has intensified and we have made and will continue to make capital expenditure to develop 5G mobile service capabilities and technologies. We may need to incur additional capital expenditures to keep up with unexpected developments in rapidly evolving telecommunications technology. There can be no assurance that we will be able to secure funds on satisfactory terms from financial institutions or other sources that are sufficient for our unanticipated needs.

Payments of contractual obligations and commitments will also require considerable resources. In our ordinary course of business, we routinely enter into commercial commitments for various aspects of our operations, including repair and maintenance. We have also provided guarantees to our affiliates. See Note 20 to the Consolidated Financial Statements for a disclosure of the guarantees provided.

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The following table sets forth selected information regarding our contractual obligations to make future payments as of December 31, 2018:

	Payments Due by Period
Contractual Obligations (1)	Total		Less than 1 Year		1-3 Years		4-5 Years		After 5 Years
	(In billions of Won)
Long-term debt obligations (including current portion of long-term debt)	￦	6,576	￦	1,276	￦	2,388	￦	911	￦	2,001
Finance lease obligations (including any interests)		202		78		102		22		—
Operating lease obligations		374		109		185		79		1
Severance payment obligations (2)		5,108		183		453		499		3,973
Asset retirement obligations		119		31		11		8		69
Long-term accounts payable—others		1,825		355		687		297		486
Total		14,204		2,032		3,826		1,816		6,530
Estimate of interest payment based on contractual interest rates effective as of December 31, 2018	￦	968	￦	150	￦	247	￦	176	￦	395

(1) Contractual obligations represent contractual liabilities as of the consolidated balance sheet date excluding refundable deposits for telephone installation and accruals for customer call bonus points, which do not have definitive payment schedules.

(2) The amount represents undiscounted pension benefit as of December 31, 2018.

Capital Resources

We have traditionally met our working capital and other capital requirements principally from cash provided by operations, while raising the remainder of our requirements primarily through debt financing.

Our major sources of cash have been net cash provided by operating activities, including profits for the year, expenses not involving cash payments such as depreciation and amortization, and proceeds from issuance of bonds and borrowings. We expect that these sources will continue to be our principal sources of cash in the future. We recorded profits for the year of ￦832 billion in 2016, ￦546 billion in 2017 and ￦719 billion in 2018 as discussed in “Item 5.A. Operating Results.” Non-cash expense adjustments in our statement of cash flows from depreciation and amortization of intangible assets amounted to ￦3,422 billion in 2016, ￦3,438 billion in 2017 and ￦3,365 billion in 2018, primarily reflecting our capital investment activities during the recent years, including our purchase of bandwidth licenses for our operations, investments in network infrastructures and acquisition of real estate. Cash proceeds from borrowings and debentures were ￦1,123 billion in 2016, ￦616 billion in 2017 and ￦1,473 billion in 2018. As of December 31, 2018, we held 15,967,040 treasury shares.

Since 2012, we have disposed of a portion of our trade receivables relating to handset sales to several special purpose companies, as part of our efforts to improve our cash and asset management. We also entered into asset management agreements with each of these special purpose companies, and will be receiving management fees from such companies. See Note 20 to the Consolidated Financial Statements.

We believe that we have sufficient working capital available to us for our current requirements and that we have a variety of alternatives available to us to satisfy our financial requirements to the extent that they are not met by funds generated by operations, including the issuance of debt securities and bank borrowings denominated in Won and various foreign currencies. For example, we issued (i) US$400 million of 2.500% notes due 2026 in July 2016, (ii) US$400 million of 2.625% notes due 2022 in August 2017, (iii) US$200 million of LIBOR(3M)+0.450% notes due 2020 in August 2018,

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(iv) US$100 million of LIBOR(3M)+0.900% notes due 2023 in August 2018 and (v) Japanese Yen 30 billion of 0.300% notes due 2020 in November 2018. See Note 16 to the Consolidated Financial Statements. However, our ability to rely on some of these alternatives could be affected by factors such as the liquidity of the Korean and the global financial markets, prevailing interest rates, our credit rating and the Government’s policies regarding Won currency and foreign currency borrowings. Other factors which could materially affect our liquidity in the future include unanticipated increase in capital expenditures and decrease in cash provided by operations resulting from a significant decrease in demand for our services. We may also need to raise additional capital sooner than we expect in order to fund unanticipated investments and acquisitions.

Our total equity was ￦12,917 billion as of December 31, 2016, ￦13,183 billion as of December 31, 2017 and ￦14,658 billion as of December 31, 2018.

Liquidity

We had a working capital (current assets minus current liabilities) surplus of ￦327 billion as of December 31, 2016, ￦354 billion as of December 31, 2017 and ￦2,764 billion as of December 31, 2018. The following table sets forth the summary of our significant current assets for the years indicated:

	As of December 31,
	2016		2017		2018
	(In billions of Won)
Cash and cash equivalents	￦	2,900	￦	1,928	￦	2,703
Trade and other receivables, net		5,478		5,965		5,680
Inventories, net		455		642		1,075
Other financial assets		721		973		995

Our cash and cash equivalents (substantially all of which are in Won) totaled ￦2,900 billion as of December 31, 2016, ￦1,928 billion as of December 31, 2017 and ￦2,703 billion as of December 31, 2018. Under IFRS as issued by IASB, bank deposits held at call and all other highly liquid temporary cash instruments within maturities of three months are considered as cash equivalents. Other current financial assets primarily consist of financial instruments, available-for-sale financial assets and derivative assets used for hedging.

The following table sets forth the summary of our significant current liabilities for the years indicated:

	As of December 31,
	2016		2017		2018
	(In billions of Won)
Trade and other payables	￦	7,142	￦	7,426	￦	7,008
Borrowings		1,820		1,573		1,368

Substantially all of our revenues are denominated in Won. Depreciation of the Won may materially affect the results of our operations because, among other things, it causes an increase in the amount of Won required by us to make interest and principal payments on our foreign currency-denominated debt, the costs of telecommunications equipment that we purchase from overseas sources, net settlement payments to foreign carriers and certain payments related to our derivative instruments entered into for foreign exchange risk hedging purposes. As of December 31, 2018, we entered into various commitments with financial institutions totaling ￦2,945 billion and US$233 million, of which ￦607 billion and US$137 million was used. See Note 20 to the Consolidated Financial Statements. Of the ￦6,648 billion total book value of debentures and borrowings outstanding as of December 31, 2018, ￦2,392 billion was denominated in foreign currencies. See Note 16 to the

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Consolidated Financial Statements. Upon the identification and evaluation of our currency risk exposures, we, having considered various circumstances, enter into derivative financial instruments to manage such risks. See “Item 11. Quantitative and Qualitative Disclosures About Market Risk—Exchange Rate Risk and Interest Rate Risk.” We have not had, and do not anticipate that we will have, difficulty gaining access to short-term financing sufficient to meet our current requirements.

Capital Expenditures

We used cash of ￦2,764 billion in 2016, ￦2,442 billion in 2017 and ￦2,261 billion in 2018 for the acquisition of property, plant and equipment and investment property. We currently expect our capital expenditure for the acquisition of property, plant and equipment and investment property in 2019 to increase compared to the ￦2,261 billion incurred in 2018, and remain subject to adjustment depending on market conditions, our results of operations and changes in our build-out plan for our 5G mobile telecommunications network.

Inflation

We do not consider that inflation in Korea has had a material impact on our results of operations in recent years. According to data published by the Bank of Korea, annual inflation in Korea was 1.0% in 2016, 1.9% in 2017 and 1.5% in 2018. See “Item 3. Key Information—Item 3.D. Risk Factors—Korea is our most important market, and our current business and future growth could be materially and adversely affected if economic or political conditions in Korea deteriorate.”

Item 5.C.  Research and Development, Patents and Licenses, Etc.

In order to maintain our leadership in the converging telecommunications business environment and develop additional platforms, services and applications, we engage in research and development (“R&D”) activities in our various business units and also operate the following R&D laboratories:

• an infrastructure R&D laboratory;

• a service R&D laboratory; and

• a convergence R&D laboratory.

As of December 31, 2018, KT Corporation had 4,892 domestic and 1,177 international registered patents.

The MSIT has the authority to recommend to network service providers that they provide funds for national research and development of telecommunications technology and related projects. Including such contributions, total expenditures (which include capitalized expenses) on research and development were ￦215 billion in 2016, ￦435 billion in 2017 and ￦273 billion in 2018.

Item 5.D.  Trend Information

These matters are discussed under Item 5.A. above where relevant.

Item 5.E.  Off-balance Sheet Arrangements

These matters are discussed under Item 5.B. above where relevant.

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Item 5.F.  Tabular Disclosure of Contractual Obligations

These matters are discussed under Item 5.B. above where relevant.

Item 5.G.  Safe Harbor

See “Item 3.D. Risk Factors—Forward-looking statements may prove to be inaccurate.”

Item 6. Directors, Senior Management and Employees

Item 6.A.  Directors and Senior Management

Directors

Our board of directors has the ultimate responsibility for the administration of our affairs. Our articles of incorporation provide for a board of directors consisting of:

• up to three standing directors, including the chief executive officer; and

• up to eight outside directors.

All of our directors are elected at the general shareholders’ meeting. If the total assets of a company listed on the KRX KOSPI Market exceed ￦2,000 billion as of the end of the preceding year, which is the case with us, the Commercial Code of Korea requires such company to have more than three outside directors, with outside directors being the majority of the board of directors. The term of office for a director is up to three years, but the term is extended to the close of the annual shareholders’ meeting convened with respect to the last full fiscal year of a director’s term of office. If the term of office for a director is not completed and ends before the close of the annual general shareholders’ meeting and a new director is appointed in his or her place, the term of office for such replacement director will coincide with the uncompleted remaining term of office of his or her predecessor.

Under the Commercial Code of Korea, we must establish a committee to nominate candidates for outside directors within the board of directors, and outside directors must make up more than half of the total members of the outside director candidate nominating committee. According to our articles of incorporation, such committee must consist of one standing director and all of our outside directors, other than for election of an outside director resulting from the expiration of the term of the office, in which case such outside director whose term is expiring may not be a member of the committee. Our Outside Director Candidate Nominating Committee nominates outside director candidates for appointment at the general shareholders’ meeting.

Upon the request of any director (to the extent that the board of directors does not separately authorize only a particular director to make such request), a meeting of the board of directors will be assembled. The chairperson of the board of directors is elected from among the outside directors by a resolution of the board of directors. The term of office of the chairperson is one year.

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Our current directors are as follows:

Name	Position	Director Since		Date of Birth	Expiration of Term of Office
Standing Directors (1)
Chang-Gyu Hwang	Chief Executive Officer		January 2014	January 23, 1953		2020
Dong-Myun Lee	President, Head of Future Platform Business Group		March 2019	October 15, 1962		2020
In-Hoe Kim	President, Head of Corporate Planning Group		March 2019	June 25, 1964		2020
Outside Directors (1)
Jong-Gu Kim	Corporate lawyer, New Dimension Law Group		March 2014	July 7, 1941		2020
Suk-Gwon Chang	Professor, School of Business, Hanyang University		March 2014	February 21, 1956		2020
Gae-Min Lee	Former Editor-in-Chief, The Korea Economic Daily		March 2017	November 1, 1946		2020
Il Im	Professor, Business Administration, Yonsei University		March 2017	March 20, 1966		2020
Dae-You Kim	Outside Director, DB Life Insurance Co., Ltd.		March 2018	July 21, 1951		2021
Gang-Cheol Lee	Former Auditing Director, Ultra V Co., Ltd.		March 2018	May 6, 1947		2021
Hee-Yol Yu	Chair-Professor, Pusan National University		March 2019	January 12, 1947		2022
Tae-Yoon Sung	Professor, School of Economics, Yonsei University		March 2019	February 13, 1970		2022

(1) All of our standing and outside directors beneficially own less than one percent of the issued shares of KT Corporation in the aggregate.

Chang-Gyu Hwang has served as our standing director since 2014 and has served as our chief executive officer since January 2014. Previously, he served as a distinguished chair professor at Sungkyunkwan University, president and national chief technology officer of the Office of Strategic Research and Development Planning at the former Ministry of Knowledge and Economy, president and chief technology officer of the Corporate Technology Office at Samsung Electronics Co., Ltd. and president and chief executive officer of the Semiconductor Business at Samsung Electronics Co., Ltd. Mr. Hwang holds a bachelor’s degree and a master’s degree in electrical engineering from Seoul National University and a Ph.D. in electronic and computer engineering from the University of Massachusetts, Amherst.

Dong-Myun Lee has served as our standing director since March 2019 and has served as the head of our Future Platform Business Group since November 2018. Previously, he served as the head of the Institute of Convergence Technology. Mr. Lee holds a bachelor’s degree in electrical engineering from Seoul National University and a master’s degree and a Ph.D. in electrical engineering from the Korea Advanced Institute of Science and Technology.

In-Hoe Kim has served as our standing director since March 2019 and has served as the president and the head of our Corporate Planning Group since November 2018. Previously, he served as the head of the CEO office and the head of Financial Management Office. Mr. Kim holds a bachelor’s degree in international economics from Seoul National University and a master’s degree in business administration from the Korea Advanced Institute of Science and Technology.

Jong-Gu Kim has served as our outside director since March 2014. He is currently a corporate lawyer at the New Dimension Law Group. Previously, he served as the minister of the Ministry of

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Justice and as the head of the Seoul Supreme Prosecutors’ Office. Mr. Kim holds both a bachelor’s degree in law from Seoul National University and a Ph.D. in law from Dongguk University.

Suk-Gwon Chang has served as our outside director since March 2014. He is currently a professor of the School of Business at Hanyang University. Previously, he served as the dean of Hanyang Cyber University Graduate School and the president of the Korea Association for Telecommunication Policy and Korea Media Management Association. Mr. Chang holds a bachelor’s degree in industrial engineering from Seoul National University and a Ph.D. in management science from Korea Advanced Institute of Science and Technology.

Gae-Min Lee has served as our outside director since March 2017. Previously, he served as an advisor to the Korea News Editors’ Association Fund, editor-in-chief of The Korea Economic Daily and chief executive officer of Hankyung.com. Mr. Lee holds a bachelor’s degree and a Ph.D. in Economics from Kyung Hee University.

Il Im has served as our outside director since March 2017. He is currently a professor of business administration at Yonsei University. Previously, he served as a vice headmaster of the Yonsei Graduate School of Business and a vice chairman of the Korean Academic Society of Business Administration. Mr. Im holds a bachelor’s degree and a master’s degree in business administration from Seoul National University and a Ph.D. in information systems from the University of Southern California.

Dae-You Kim has served as our outside director since March 2018. He is currently an outside director of DB Life Insurance Co., Ltd. Previously, he served as the vice chairman of Wonik Investment Partners and a professor of Hanyang University. He also previously served as a presidential secretary for economic policies to the President of Korea. Mr. Kim holds a bachelor’s degree in export studies at Seoul National University and a masters’ degree in public policy from the University of Wisconsin.

Gang-Cheol Lee has served as our outside director since March 2018. He served as an auditing director of Ultra V Co., Ltd. Previously, he served as a presidential secretary of civil society policies to the President of Korea. Mr. Lee holds a bachelor’s degree in political science and diplomacy from Kyungpook National University.

Hee-Yol Yu has served as our outside director since March 2019. He is currently a chief-professor at Pusan National University and a board chairperson of the Korea Carbon Capture and Sequestration R&D Center. Previously, he served as vice minister of the Ministry of Science & Technology. Mr. Yu holds a bachelor’s degree in liberal arts and sciences from Seoul National University and a master’s degree in public administration from Seoul National University. He also holds a master of philosophy degree in technology innovation of the science policy research unit from Sussex University and a Ph.D in politics and science and technology policy making from Korea University.

Tae-Yoon Sung has served as our outside director since March 2019. He is currently a professor of economics at Yonsei University, a dean of the Yonsei Underwood International College and an editorial board member of the Korean Economic Review at Korean Economic Association. Mr. Sung holds a bachelor’s degree and a master’s degree in economics from Yonsei University and a Ph.D. in economics from Harvard University.

For the purposes of the Korean Commercial Code, our chief executive officer is deemed to be the “representative director” who is authorized to perform all judicial and extra-judicial acts relating to our business. Our shareholders elect the chief executive officer in accordance with the provisions of the Commercial Code and our articles of incorporation. In March 2018, we amended our articles of

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incorporation in efforts to add more rigor and transparency to the process of selecting our chief executive officer. Our Corporate Governance Committee conducts investigation and composition of a pool of candidates and selects chief executive officer candidates whose candidacy will be further examined. Subsequently, the President Candidate Examination Committee examines and selects chief executive officer candidates and submits an examination report of such candidates to our board of directors. A chief executive officer candidate recommended by our board of directors is nominated at the shareholders’ meeting.

Under our articles of incorporation, the board of directors must submit a draft management contract between KT Corporation and the candidate covering our management objectives to the shareholders’ meeting at the time of candidate nomination to the meeting. When the draft management contract has been approved at the shareholders’ meeting, we enter into such management contract with the chief executive officer. In such case, the chairperson of the board of directors, on our behalf, signs the management contract.

The board of directors may conduct performance review discussions to determine if the new chief executive officer performed his or her duties under the management contract, or hire a professional evaluation agency for such purpose. If the board of directors determines, based on the results of the performance review, that the new chief executive officer has failed to achieve the management goals, it may propose to dismiss the chief executive officer at a shareholders’ meeting.

Senior Management

In addition to our standing directors who are also our executive officers, we have the following executive officers as of March 31, 2019:

Name	Title and Responsibilities	Year of birth
Hyeon-Mo Ku	President, Customer & Media Business Group		1964
Seong-Mok Oh	President, Network Group		1960
Sang-Bong Nam	Senior Executive Vice President, Ethics Office		1963
Byung-Sam Park	Senior Executive Vice President, Legal Affairs Office		1966
Yoon-Young Park	Senior Executive Vice President, Enterprise Business Group		1962
Jong-Ook Park	Senior Executive Vice President, Strategy & Planning Office		1962
Soo-Jung Shin	Senior Executive Vice President, IT Planning Office		1965
Jong-Jin Yoon	Senior Executive Vice President, Public Relations Office		1964
Pill-Jai Lee	Senior Executive Vice President, Marketing Group		1961
Hong-Beom Jeon	Senior Executive Vice President, Institute of Convergence Technology		1962
Young-Myoung Kim	Executive Vice President, Energy Platform Business Unit		1961
Young-Sik Kim	Executive Vice President, Intelligent Network Service Unit		1961
Weon-Kyung Kim	Executive Vice President, GiGA Service Business Unit		1963
June-Keun Kim	Executive Vice President, Safety and Security Platform Business Unit		1966
Hee-Su Kim	Executive Vice President, KT Institute of Economics & Business Research		1962
Kyeong-Weon Park	Executive Vice President, Daegu Sales Headquarters		1963
Dae-Su Park	Executive Vice President, Business Relations Group		1963
Sang-Hoon Park	Executive Vice President, Gangbuk Network O&M Headquarters		1962
Chang-Seok Seo	Executive Vice President, Network Strategy Unit		1967
Kyung-Min Song	Executive Vice President, CEO Office		1963
Jae-Ho Song	Executive Vice President, Media Platform Business Unit		1966
Hyun-Yok Sheen	Executive Vice President, Corporate Management Group		1968
Sang-Keun Ahn	Executive Vice President, Southern Seoul Sales Headquarters		1962
Kyung-Keun Yoon	Executive Vice President, Financial Management Office		1963
Hye-Jeong Yun	Executive Vice President, Big Data Business Support Unit		1966
Seung-Yong Lee	Executive Vice President, Communication Business Relations Office		1964
Hyeon-Seuk Lee	Executive Vice President, Device Business Unit		1966
Sang-Kwi Chang	Executive Vice President, Legal Affairs Department 1		1968
Yoon-Sik Jeong	Executive Vice President, Enterprise Customer Business Unit		1964
Young-Min Choi	Executive Vice President, KT Group HR Development Academy		1961

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In-Sik Kang	Senior Vice President, Media Contents Department	1960
Kyoung-Woo Ko	Senior Vice President, Busan Network O&M Headquarters	1963
Yoon-Jeon Koh	Senior Vice President, External Training	1967
Choong-Rim Ko	Senior Vice President, Strategic Channel Business Unit	1967
Ki-Yeon Kwak	Senior Vice President, External Training	1971
Kwang-Dong Kim	Senior Vice President, Future Convergence Policy Department	1970
Man-Sik Kim	Senior Vice President, Communications Policy Department 1	1967
Byung-Kyun Kim	Senior Vice President, Device Development Department	1968
Bong-Gyun Kim	Senior Vice President, Biz Customer Business Unit	1972
Bong-Ki Kim	Senior Vice President, Security Design Task Force	1968
Sung-In Kim	Senior Vice President, Global Sales Unit	1969
Young-Woo Kim	Senior Vice President, Global Business Development Unit	1967
Young-In Kim	Senior Vice President, Network Strategy Department	1968
Young-Jin Kim	Senior Vice President, CEO Office Department 1	1967
Young-Ho Kim	Senior Vice President, Northern Seoul Sales Headquarters	1966
Yi-Han Kim	Senior Vice President, Enterprise Business Performing Unit	1966
Jae-Kyung Kim	Senior Vice President, Corporate Strategy Research Department	1971
Jin-Koog Kim	Senior Vice President, Group Relations Unit	1965
Jin-Han Kim	Senior Vice President, AI Tech Center	1963
Chae-Hee Kim	Senior Vice President, AI Business Unit	1974
Cheol-Kee Kim	Senior Vice President, Future Business Relations Office	1970
Tae-Gyun Kim	Senior Vice President, Honam Network O&M Headquarters	1971
Hyeon-Soo Kim	Senior Vice President, External Training	1966
Hye-Joo Kim	Senior Vice President, Big Data Business Planning Department	1970
Hoon-Bae Kim	Senior Vice President, New Media Business Center	1963
Pyeong Ryu	Senior Vice President, Small & Medium Business Customer Department	1966
Sung-Uk Moon	Senior Vice President, New Renewable Energy Business Department	1972
Young-Il Moon	Senior Vice President, Data & Information Security Unit	1966
Hye-Byung Min	Senior Vice President, Corporate Planning Department	1969
Yong-Man Park	Senior Vice President, Jeonbuk Sales Headquarters	1965
Jeong-Jun Park	Senior Vice President, Enterprise Customer Department 1	1967
Jong-Ryeol Park	Senior Vice President, SCM Strategy Office	1963
Joon-Hyun Park	Senior Vice President, Business Portfolio Department	1971
Hyun-Jin Park	Senior Vice President, 5G Service Business Unit	1968
Hyo-Il Park	Senior Vice President, CEO Office	1970
Gyu-Tae Baek	Senior Vice President, Service Laboratory	1959
Kyung-Cheol Seo	Senior Vice President, Chungbuk Sales Headquarters	1967
Young-Soo Seo	Senior Vice President, Chungcheong Network O&M Headquarters	1968
Yeong-Il Seo	Senior Vice President, Blockchain Biz Center	1969
So-Hee Shin	Senior Vice President, Global Sales Department 1	1968
Chang-Yong Ahn	Senior Vice President, Gangnam Network O&M Headquarters	1966
Chi-Yong Ahn	Senior Vice President, Sales Operating Business Unit	1966
Yul-Mo Yang	Senior Vice President, Media Public Relations Department 2	1967
Jin-Ho Yang	Senior Vice President, Legal Affairs Department 2	1973
Gi-Seob Oh	Senior Vice President, Jeonnam Sales Headquarters	1962
Byung-Ki Oh	Senior Vice President, Global Sales Department 2	1964
Hun-Yong Oh	Senior Vice President, Platform IT Service Unit	1966
Kyung-Hwa Ok	Senior Vice President, S/W Development Unit	1968
Heung-Jae Won	Senior Vice President, Customer Strategy Unit	1967
Yong-Kyu Yoo	Senior Vice President, Future Business Strategy Unit	1971
Chang-Kyu Yoo	Senior Vice President, Gangwon Sales Headquarters	1966
Kang-Soo Lee	Senior Vice President, Infra Service Unit	1967
Mi-Hyang Lee	Senior Vice President, Biz Incubation Center	1965
Mi-Hee Lee	Senior Vice President, IT Service Innovation Department	1970
Sun-Woo Lee	Senior Vice President, Infra Laboratory	1966
Sun-Joo Lee	Senior Vice President, Sustainability Management Unit	1969
Sung-Man Lee	Senior Vice President, IT Strategy & Planning Department	1965
Su-Kil Lee	Senior Vice President, Network Research Technology Support Unit	1968
Yong-Gyoo Lee	Senior Vice President, 5G Platform Development Unit	1965
Won-Joon Lee	Senior Vice President, Human Resources Office	1967
Jin-Woo Lee	Senior Vice President, Enterprise Service Unit	1966
Chang-Geun Lee	Senior Vice President, Public Customer Business Unit	1967

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Chang-Ho Yi	Senior Vice President, Transformation Unit	1972
Han-Sup Lee	Senior Vice President, Global Consulting/Service Delivery Unit	1966
Jong-Taek Lim	Senior Vice President, Management Support Office	1964
Min Jang	Senior Vice President, CEO Office Department 2	1968
Dae-Jin Jang	Senior Vice President, Group Contents Strategy Department	1971
Jung-Soo Jung	Senior Vice President, Busan Sales Headquarters	1966
Chang-Hwan Cho	Senior Vice President, Tax Department	1962
Jung-Yong Ji	Senior Vice President, Network O&M Unit	1968
Keun-Ha Chin	Senior Vice President, Ethics Department 1	1968
Kang-Rim Choi	Senior Vice President, Connected Car Biz Center	1974
Chan-Ki Choi	Senior Vice President, Chungnam Sales Headquarters	1966
Ho-Chang Choi	Senior Vice President, Group Communication Department	1971
Sang-Hyun Han	Senior Vice President, Enterprise Business Consulting Unit	1963
Ja-Kyung Hahn	Senior Vice President, Energy Intelligence Task Force	1971
Yong-Sun Hae	Senior Vice President, Western Seoul Sales Headquarters	1963
Suk-Zoon Huh	Senior Vice President, Marketing Strategy Department	1967
Gyung-Pyo Hong	Senior Vice President, Convergence Laboratory	1962

Item 6.B.  Compensation

Compensation of Directors and Executive Officers

In 2018, the aggregate compensation paid and accrued to all directors and executive officers was approximately Won 37.2 billion and the aggregate amount set aside or accrued by us to provide pension and retirement benefits to such persons was Won 4.4 billion.

The compensation of our five most compensated directors and executive officers who received total annual compensation exceeding ￦500 million in 2018 was as follows:

Name	Position	Total Compensation in 2018	Composition of Total Compensation
		(In millions of Won)
Chang-Gyu Hwang	Chief Executive Officer	￦1,449	￦573 (salary); ￦868 (bonus); ￦9 (benefits)
Hyun Mo Ku	President	￦709	￦375 (salary); ￦317 (bonus); ￦17 (benefits)
Heon Moon Lim*	President	￦680	￦9 (salary); ￦312 (bonus); ￦2 (benefits) ￦357 (retirement allowance)
Seong-Mok Oh	President	￦658	￦363 (salary); ￦286 (bonus); ￦9 (benefits)
Kyoung Lim Yun**	Senior Executive Vice President	￦738	￦311 (salary); ￦417 (bonus); ￦11 (benefits)

* Heon Moon Lim left the company on January 10, 2018.

** Kyoung Lim Yun left the company on March 18, 2019.

The chairperson of our board of directors enters into an employment agreement on our behalf with our chief executive officer. The employment agreement sets certain management targets to be achieved by the chief executive officer as determined by the Evaluation and Compensation Committee each year, including a target for the amount of “EBITDA” to be achieved in each year. EBITDA is defined as earnings before interest, tax, depreciation and amortization. Other management targets include (i) short-term operational and strategic goals centered around key performance indices and (ii) increase on a long-term basis in shareholder value measured against performance of companies listed on KOSPI and the shares of our competitors. Failure to achieve certain thresholds below the targets will allow the board of directors to take actions with respect to the chief executive officer’s employment, including proposing at the shareholders’ meeting an early termination of his employment.

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In addition, the head of each of our functional departments, the president of each of our subsidiaries and the heads of each regional head office have entered into employment agreements with the chief executive officer that provide for similar management targets to be achieved by each of our departments, subsidiaries and regional head offices.

Item 6.C.  Board Practices

As of April 1, 2019, none of our standing or outside directors maintained directors’ service contracts with us or with any of our subsidiaries providing for benefits upon termination of employment.

Corporate Governance Committee

The Corporate Governance Committee is comprised of four outside directors and one standing director, Dae-You Kim, Jong-Gu Kim, Suk-Gwon Chang, Gang-Cheol Lee and In-Hoe Kim. The chairperson is Dae-You Kim. The committee is responsible for the review of matters with respect to our Corporate Governance Guidelines and our performance under such guidelines to monitor effectiveness of our corporate governance. The committee is also responsible for authorization of investigation and composition of a pool of internal and external chief executive officer candidates and selection of the chief executive officer candidates, who shall be further examined by the President Candidate Examination Committee, pursuant to the examination criteria determined by our board of directors. The committee members are elected by the board after the annual meeting, and the term of the committee members is one year.

President Candidate Examination Committee

The President Candidate Examination Committee is comprised of one standing director and all of our outside directors. No member of this committee shall become a candidate for the position of the chief executive officer during his or her term as a member of the committee. The committee’s duties include examining the chief executive officer candidates selected under the examination criteria determined by our board of directors, selecting the chief executive officer candidates pursuant to such criteria and reporting to the board of directors the outcome of the examination.

Outside Director Candidate Nominating Committee

The Outside Director Candidate Nominating Committee consists of one standing director and all of our outside directors, other than for election of an outside director resulting from the expiration of the term of the office, in which case such outside director whose term is expiring may not be a member of the committee. The committee’s duties include reviewing the qualifications of potential candidates and proposing nominees to serve as outside directors on our board of directors to the shareholders at the general shareholders’ meeting. The committee members’ terms expire immediately after the adjournment of the shareholders’ meeting where the outside directors are elected.

Evaluation and Compensation Committee

The Evaluation and Compensation Committee is currently comprised of four outside directors, Gae-Min Lee, Gang-Cheol Lee, Hee-Yol Yu, and Tae-Yoon Sung. The chairperson is Gae-Min Lee. The committee’s duties include prior review of the chief executive officer’s management goals, terms and conditions proposed for inclusion in the management contract of the chief executive officer, including, but not limited to, determining whether the chief executive officer has achieved the management goals, and the determination of compensation for the chief executive officer and the standing directors. The committee members are elected by the board after the closing of the annual meeting, and the term of the committee members is one year.

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Management Committee

The Management Committee is currently comprised of Chang-Gyu Hwang, Dong-Myun Lee and In-Hoe Kim. The chairperson is Chang-Gyu Hwang. The committee’s duties include the authorization of establishment and management of branch offices, the disposal and sale of stocks of our subsidiaries, which have a market value between ￦15 billion and ￦30 billion, provided that no change of control with respect to such subsidiary occurs as a result of such disposal or sale for stocks with market value of ￦10 billion or more, making investments and providing guarantees between ￦15 billion to ￦30 billion, the acquisition and disposal of real estate having market value between ￦15 billion to ￦30 billion, and the issuance of certain debt securities.

Related-Party Transactions Committee

The Related-Party Transactions Committee is currently comprised of four outside directors, Il Im, Gae-Min Lee, Hee-Yol Yu and Tae-Yoon Sung. The chairperson is Il Im. This committee’s duties include reviews of transactions between KT Corporation and its subsidiaries and ensures compliance with applicable antitrust laws. The committee members are elected by the board after the annual meeting, and the term of the committee members is one year.

Sustainability Management Committee

The Sustainability Management Committee is currently comprised of four outside directors and one standing director, Gang-Cheol Lee, Gae-Min Lee, Hee-Yol Yu, Tae-Yoon Sung and Dong-Myun Lee. The chairperson is Gang-Cheol Lee. The committee’s duties include reviews of sustainable management plans, the authorization of establishment of medium- and long-term sustainable management strategies, sustainable management results, regular reporting and risk management of sustainable management activities and charitable contributions between ￦100 million to ￦1 billion. The committee members are elected by the board after the annual meeting, and the term of the committee members is one year.

Audit Committee

Under the Commercial Code of Korea and our articles of incorporation, we are required to establish an audit committee comprised of three or more outside directors and at least two-thirds of the Audit Committee members are required to be outside directors. Audit Committee members must also meet the applicable independence criteria set forth under the rules and regulations of the Sarbanes-Oxley Act of 2002. The committee is currently comprised of Suk-Gwon Chang, Jong-Gu Kim, Dae-You Kim and Il Lim. The chairperson and the financial expert is Suk-Gwon Chang. Members of the committee are elected by our shareholders at the shareholders’ meeting. Our internal and external auditors report directly to the committee.

The duties of the committee include:

• appointing independent auditors;

• approving the appointment and recommending the dismissal of the internal auditor;

• evaluating performance of independent auditors;

• approving services to be provided by the independent auditors;

• reviewing annual financial statements;

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• reviewing audit results and reports;

• reviewing and evaluating our system of internal controls and policies;

• examining improprieties or suspected improprieties; and

• on a quarterly basis, reviewing reports on internal controls for legal compliance, including with respect to cybersecurity laws.

In addition, regarding the shareholders’ meeting, the committee may examine the agenda, financial statement and other reports to be submitted by the board of directors at each shareholders’ meeting.

Item 6.D.  Employees

On a non-consolidated basis, we had 23,835 employees as of December 31, 2018, compared to 23,925 employees as of December 31, 2017 and 23,670 employees as of December 31, 2016.

Labor Relations

We consider our current relations with our work force to be good. However, in the past, we have experienced opposition from our labor union for our strategy of restructuring to improve our efficiency and profitability by disposing of non-core businesses and reducing our employee base.

As of December 31, 2018, about 77.6% of the employees of KT Corporation were members of the KT Trade Union. On behalf of its members, the union negotiates a collective bargaining agreement with us every two years, and our current collective bargaining agreement expires on October 9, 2019. The current collective bargaining agreement provides that even in the event of a strike, the minimum number of employees necessary to operate the telecommunications business must continue to work.

The union also negotiates its members’ wages with us every year. Under the Act of the Promotion of Worker’s Participation and Cooperation, our Employee-Employer Cooperation Committees, which are composed of representatives of management and labor for each business unit and regional office, meet quarterly to discuss employee grievances, working conditions and potential employee-initiated improvements in service or management.

The Trade Union and Labor Relations Adjustment Act (“Labor Act”) allow multiple labor unions to be formed within one company. Therefore, additional labor unions may be formed by our employees. Pursuant to such amendments, our employees formed a new labor union called “KT New Union” in July 2011. The Labor Act also requires such multiple unions to consolidate themselves into a single channel when negotiating with the company on behalf of their members and to enter into a single collective bargaining agreement with the company. As a result of the recent consolidation of labor unions, KT Trade Union was selected as the bargaining representative of the labor unions. Its term as the bargaining representative will last for two years from January 1, 2018.

Employee Stock Ownership and Benefits

We have an employee stock ownership association, which may purchase on behalf of its members up to 20.0% of any of our shares offered publicly in Korea. The employee stock ownership association owned 0.5% of our issued shares as of December 31, 2018.

In accordance with the National Pension Act of Korea, we contribute an amount equal to 4.5% of an employee’s standard monthly wages, and each employee contributes 4.5% of his or her standard

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monthly wages, into his or her personal pension account. Our employees, including executive officers as well as non-executive employees, are subject to a pension insurance system, under which we make monthly contributions to the pension accounts of the employees, and upon retirement, such employees are paid the pension amount due from their pension accounts. Prior to April 2011, our executive and non-executive employees were subject to a lump-sum severance payment system, under which they were entitled to receive a lump-sum severance payment upon termination of their employment, based on their length of service and salary level at the time of termination. Starting in April 2011, in accordance with the Korean Employee Retirement Income Security Act, we replaced such lump-sum severance payment system with our current pension insurance system in the form of a defined benefit plan, and also introduced a defined contribution plan in December 2012, with a total combined unfunded portion of approximately ￦1,691 billion as of December 31, 2018. Lump-sum severance amounts previously accrued prior to our adoption of the current pension insurance system continue to remain payable. We also provide a wide range of fringe benefits to our employees, including housing, housing loans, company-provided hospitals and schools, a company-sponsored pension program, an employee welfare fund, industrial disaster insurance, cultural and athletic facilities, physical education grants, meal allowances, medical examinations and training and resort centers. See “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results.”

Employee Training

The objective of our training program is to develop information technology specialists who are able to create value for our customers. In order to develop skills of our employees, we require 83 hours of training per year from most of our employees, using individually-tailored curriculums based on individual assessments. We also operate a Cyber Academy to provide online classes to our employees, as well as offer various foreign language classes to our employees. In addition, we provide tuition and living expense reimbursements to our high potential employees who pursue graduate programs in Korea and abroad, as well as provide financial assistance to those who pursue work-related professional licenses or participate in after-work study programs.

Item 6.E.  Share Ownership

Ordinary Shares

The persons who currently serve as our directors or executive officers held, as a group, 185,168 ordinary shares as of March 31, 2019, the most recent date for which this information is available. The table below shows the ownership of our ordinary shares by our directors and executive officers:

Shareholders	Number of Ordinary Shares Owned
Chang-Gyu Hwang		39,074
Seong-Mok Oh		14,978
Hyeon-Mo Ku		10,507
Dong-Myun Lee		5,012
Hong-Beom Jeon		4,980
Chang-Seok Seo		4,700
Pill-Jai Lee		4,442
In-Hoe Kim		4,386
Jae-Ho Song		4,110
Sang-Keun Ahn		3,779
Weon-Kyung Kim		3,721
Dae-Su Park		3,666
Jong-Ook Park		3,436
Yoon-Sik Jeong		3,134
Young-Ho Kim		3,106
Young-Myoung Kim		3,105

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Yoon-Young Park	3,088
Kyeong-Weon Park	2,757
Jong-Jin Yoon	2,756
Seung-Yong Lee	2,685
Young-Sik Kim	2,521
Soo-Jung Shin	2,482
Hyeon-Seuk Lee	2,482
Sang-Bong Nam	2,472
Hye-Jeong Yun	2,362
Gyung-Pyo Hong	2,355
Hee-Su Kim	2,324
Sun-Woo Lee	2,259
June-Keun Kim	2,099
Hyun-Yok Sheen	2,099
Sang-Kwi Chang	2,093
Byung-Sam Park	2,006
In-Sik Kang	1,977
Kyung-Keun Yoon	1,710
Young-Min Choi	1,710
Jong-Gu Kim	1,694
Suk-Gwon Chang	1,694
Sang-Hoon Park	1,640
Mi-Hyang Lee	1,440
Han-Sup Lee	1,111
Hoon-Bae Kim	1,008
So-Hee Shin	1,002
Man-Sik Kim	998
Gyu-Tae Baek	988
Kang-Soo Lee	988
Chang-Geun Lee	988
Sang-Hyun Han	988
Heung-Jae Won	858
Kyung-Min Song	787
Bong-Gyun Kim	787
Jong-Ryeol Park	787
Dae-Jin Jang	748
Chang-Hwan Cho	722
Yeong-Il Seo	690
Kwang-Dong Kim	655
Gae-Min Lee	399
Il Im	399
Kyoung-Woo Ko	361
Yi-Han Kim	270
Choong-Rim Ko	262
Byung-Ki Oh	259
Young-Soo Seo	246
Chang-Yong Ahn	244
Chan-Ki Choi	239
Mi-Hee Lee	166
Yong-Gyoo Lee	162
Jung-Soo Jung	106
Jae-Kyung Kim	100
Jung-Yong Ji	98
Hyo-Il Park	61
Chang-Ho Yi	51
Suk-Zoon Huh	51
Young-Woo Kim	46
Pyeong Ryu	46
Sung-Man Lee	46
Ja-Kyung Hahn	46
Byung-Kyun Kim	36
Young-In Kim	36

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Jin-Koog Kim	36
Chae-Hee Kim	36
Sung-Uk Moon	36
Yong-Man Park	36
Jeong-Jun Park	36
Kyung-Cheol Seo	36
Yong-Kyu Yoo	36
Chang-Kyu Yoo	36
Su-Kil Lee	36
Min Jang	36
Keun-Ha Chin	36
Kang-Rim Choi	36
Won-Joon Lee	25
Young-Jin Kim	14
Sun-Joo Lee	10
Yong-Sun Hae	10
Hyun-Jin Park	1
Total	185,168

Stock Options

We have not granted any stock options to our current directors and executive officers.

Item 7.  Major Shareholders and Related Party Transactions

Item 7.A.  Major Shareholders

The following table sets forth certain information relating to the shareholders of our ordinary shares as of December 31, 2018:

Shareholders	Number of Shares		Percent of Total Shares Issued
National Pension Corporation		31,823,426		12.19	%
NTT DoCoMo, Inc.		14,257,813		5.46	%
Silchester International Investors LLP		11,687,193		4.48	%
Employee stock ownership association		1,188,070		0.46	%
Directors as a group		77,603		0.03	%
Public		186,110,663		71.28	%
KT Corporation (held in the form of treasury stock)		15,967,040		6.12	%
Total issued shares		261,111,808		100.00	%

Item 7.B.  Related Party Transactions

We have engaged in various transactions with our subsidiaries and affiliated companies. See Note 35 to the Consolidated Financial Statements. We have not issued any guarantees in favor of our consolidated subsidiaries.

Item 7.C.  Interests of Experts and Counsel

Not applicable.

Item 8.  Financial Information

Item 8.A.  Consolidated Statements and Other Financial Information

See “Item 18. Financial Statements” and pages F-1 through F-112.

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Legal Proceedings

In July 2012, the Fair Trade Commission issued to us an administrative fine of approximately ￦5 billion as well as certain corrective orders, after investigating certain pricing and subsidy practices of mobile service carriers and handset manufacturers. Samsung Electronics Co., Ltd., LG Electronics Co., Ltd., Pantech Curitel Co., Ltd., SK Telecom and LG U+ were also issued administrative fines as a result of the investigation. We filed for a stay of execution of the Fair Trade Commission’s decision, and in September 2012, the Seoul High Court granted a stay of execution with respect to the corrective order, and denied the stay of execution with respect to the administrative fine. We paid the entire fine in September 2012. In September 2012, we filed a lawsuit with the Seoul High Court against the Fair Trade Commission to appeal the administrative fine and the corrective order, and on February 6, 2014, the Seoul High Court ruled against us on our appeal. In February 2014, we filed another appeal with respect to the administrative fine with the Supreme Court of Korea and filed for a stay of execution with respect to the corrective order in March 2014, which was accepted and became effective in April 2014. The appeal is currently ongoing. The outcome of this case will not result in any fine in addition to the fine we already paid in September 2012.

In August 2014, the KCC imposed a fine of approximately ￦58 billion on SK Telecom, LG U+ and us (our fine being approximately ￦11 billion) for providing excessive subsidies to new subscribers. In December 2014, the KCC further imposed a fine of approximately ￦8 billion on each of SK Telecom, LG U+ and us for providing excessive handset subsidies. In March 2015, the KCC also imposed a combined fine of approximately ￦34 billion on SK Telecom, LG U+ and us (our fine being approximately ￦9 billion) for violation of regulations relating to handset sales, in connection with a used handset buyback program that we and the other telecommunications operators were promoting. On February 23, 2018, the KCC imposed a combined fine of approximately ￦50.6 billion on SK Telecom, LG U+ and us (our fine being approximately ￦12.5 billion) for violation of regulations relating to handset sales in case of wholesale, online sale, etc.

In 2009, we entered into a contract with Enspert, Co., Ltd.(“Enspert”), a consumer electronics manufacturer, to purchase approximately 200,000 tablet PCs. Due to defects with the tablet PCs, we cancelled our contract and the outstanding order for approximately 170,000 tablet PCs, for which we would have paid approximately ￦51 billion. In June 2014, the Korea Fair Trade Commission imposed a fine of approximately ￦2 billion on us, finding that we cancelled our contract with Enspert without cause. We appealed such decision but the decision was confirmed by the Seoul High Court and the Supreme Court in May 2016 and September 2016, respectively. In April 2017, Enspert filed a lawsuit against us at the Seoul Central Court, alleging damages of approximately ￦94 billion caused by our cancellation of the contract between Enspert and us for the tablet PCs and specifying a claim amount of ￦47 billion. The case is currently pending at the Seoul Central Court, and we intend to vigorously defend against such lawsuit.

In April 2019, the Korea Fair Trade Commission determined that we, LG U+, SK Broadband and Sejong Telecom colluded in numerous biddings held by public institutions, including the Public Procurement Service and the Korea Racing Authority, between April 2015 to June 2017 for the engagement of telecommunications companies to provide dedicated fixed-line services, in violation of the Monopoly Regulation and Fair Trade Act, and issued an order to cease and desist, imposed a fine of ￦5.7 billion on us and filed a criminal complaint against us. These public institutions may also restrict us from bidding on their projects in the future.

For a description of our additional legal proceedings, see “Item 3. Key Information—Item 3.D. Risk Factors—The legal cases against Mr. Suk-chae Lee, a former chief executive officer, and other former executive officers or directors—and related adverse publicity—could have a material adverse effect on our business, reputation and stock price” and “Item 3. Key Information—Item 3.D. Risk

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Factors—Our charitable or political donations, employment of certain individuals and engagement of an advertising agency connected to a scandal involving Ms. Soon-sil Choi, a confidante of former President Geun-hye Park, and other incidents and allegations could have a material adverse effect on our business, reputation and stock price.”

As of December 31, 2018, we have established provisions relating to litigation proceedings of ￦59 billion. See Note 17 to the Consolidated Financial Statements. While we are unable to predict the ultimate disposition of these claims, in the opinion of our management, the ultimate disposition of these claims will not have a material adverse effect on our business, financial condition and results of operations.

Dividends

The table below sets out the annual dividends declared on the outstanding ordinary shares to shareholders of record on December 31 of the years indicated and the interim dividends declared on the outstanding ordinary shares to shareholders of record on June 30 of the years indicated:

Year	Annual Dividend per Ordinary Share		Interim Dividend per Ordinary Share		Average Total Dividend per Ordinary Share
	(In Won)		(In Won)		(In Won)
2014	￦	0		—	￦	0
2015		500		—		500
2016		800		—		800
2017		1,000		—		1,000
2018		1,100		—		1,100

If sufficient profits are available, the board of directors may propose annual dividends on the outstanding ordinary shares, which our shareholders must approve by a resolution at the ordinary general meeting of shareholders. This meeting is generally held in March of the following year and if our shareholders at such ordinary general meeting of shareholders approve the annual dividend, we must pay such dividend within one month following the date of such resolution. Typically, we pay such dividends shortly after the meeting. The declaration of annual dividends is subject to the vote of our shareholders, and consequently, there can be no assurance as to the amount of dividends per ordinary share or that any such dividends will be declared. Interim dividends paid in cash can be declared by a resolution of the board of directors. See “Item 10. Additional Information—Item 10.B. Memorandum and Articles of Association—Dividends” and “Item 12. Description of Securities Other than Equity Securities—Item 12.D. American Depositary Shares.”

The Commercial Code provides that shares of a company of the same class must receive equal treatment. However, major shareholders may consent to receive dividend distributions at a lesser rate than minor shareholders.

Any cash dividends relating to the shares held in the form of ADSs will be paid to the depositary bank in Won. The deposit agreement provides that, except in certain circumstances, cash dividends received by the depositary bank will be converted by the depositary bank into Dollars and distributed to the holders of the ADRs, less withholding tax, other governmental charges and the depositary bank’s fees and expenses. See “Item 12. Description of Securities Other than Equity Securities—Item 12.D. American Depositary Shares.”

Item 8.B.  Significant Changes

Except as disclosed elsewhere in this annual report, we have not experienced any significant changes since the date of our audited consolidated financial statements included in this annual report.

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Item 9.  The Offer and Listing

Item 9.A.  Offer and Listing Details

Market Price Information

Ordinary Shares

Our shares were listed on the KRX KOSPI Market on December 23, 1998 under the securities identification code “030200.”

ADSs

The outstanding ADSs, each of which represents one-half of one share of our ordinary share, have been traded on the New York Stock Exchange under the ticker symbol “KT” since May 25, 1999.

Item 9.B.  Plan of Distribution

Not applicable.

Item 9.C.  Markets

Please refer to “Item 9.A. Offering and Listing Details.”

Item 9.D.  Selling Shareholders

Not applicable.

Item 9.E.  Dilution

Not applicable.

Item 9.F.  Expenses of the Issuer

Not applicable.

Item 10.  Additional Information

Item 10.A.  Share Capital

Currently, our authorized share capital is 1,000,000,000 shares, which consists of ordinary shares, par value ￦5,000 per share (“Ordinary Shares”) and shares of non-voting preferred stock, par value ￦5,000 per share (“Non-Voting Shares”). Ordinary Shares and Non-Voting Shares together are referred to as “Shares.” Under our articles of incorporation, we are authorized to issue Non-Voting Shares up to one-fourth of our total issued share capital. As of December 31, 2018, 261,111,808 Ordinary Shares were issued, of which 15,967,040 shares were held by the treasury stock fund or us as treasury shares. We have never issued any Non-Voting Shares. All of the issued Ordinary Shares are fully-paid and non-assessable and are in registered form. We issue share certificates in denominations of 1, 5, 10, 50, 100, 500, 1,000 and 10,000 shares.

Item 10.B.  Memorandum and Articles of Association

Under Article 2 of our articles of incorporation, the primary purpose of KT Corporation is to engage in, including but not limited to, the integrated telecommunications business, the new media and

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internet multimedia broadcasting business, the development and sale of media contents and software, the sale of telecommunications devices, the testing and inspection of telecommunications equipment and the telemarketing business. This section provides information relating to our share capital, including brief summaries of material provisions of our articles of incorporation, the FSCMA, the Commercial Code and related laws of Korea, all as currently in effect. The following summaries are subject to, and are qualified in their entirety by reference to, our articles of incorporation and the applicable provisions of the FSCMA and the Commercial Code. We have filed a copy of our articles of incorporation as an exhibit to registration statements under the Securities Act or annual reports under the Securities Exchange Act previously filed by us.

Directors

A director is prohibited from voting on a proposal, arrangement or contract in which the director has an interest. Director compensation is determined based on the standards and methods of compensation as determined by the board of directors and reviewed by the Compensation Committee, which consists of four independent directors, and approved by the board of directors in accordance with our articles of incorporation. See “Item 6.B. Compensation—Compensation of Directors.” Directors appointed at the general shareholders meeting may not be beneficiaries nor participants of the employee welfare fund, which includes borrowings. There is no explicit age limit relating to a director’s retirement or non-retirement, and there is no number of shares required for purposes of determining a director’s qualifications.

Dividends

We distribute dividends to our shareholders in proportion to the number of shares owned by each shareholder. No dividends are distributed with respect to shares held by us or our treasury stock fund. The Ordinary Shares represented by the ADSs have the same dividend rights as other outstanding Ordinary Shares.

Holders of Non-Voting Shares are entitled to receive dividends in priority to the holders of Ordinary Shares in an amount of not less than 9% of the par value of the Non-Voting Shares as determined by the board of directors at the time of their issuance, provided that if the dividends on the Ordinary Shares exceed those on the Non-Voting Shares, the Non-Voting Shares will also participate in the distribution of such excess dividend amount in the same proportion as the Ordinary Shares. If the amount available for dividends is less than the aggregate amount of such minimum dividend, the holders of Non-Voting Shares will be entitled to receive such accumulated unpaid dividend in priority to the holders of Ordinary Shares from the dividends payable in respect of the next fiscal year.

We declare dividends annually at the annual general meeting of shareholders which is held within three months after the end of the fiscal year. We pay the annual dividend shortly after the annual general meeting to the shareholders of record as of the end of the preceding fiscal year. We may distribute the annual dividend in cash or in Shares. However, a dividend of Shares must be distributed at par value. If the market price of the Shares is less than their par value, dividends in Shares may not exceed one-half of the annual dividend. We may pay interim dividends in cash once a year to shareholders or registered pledgees who are registered in the registry of shareholders as of June 30 of each fiscal year by a resolution of the board of directors. We have no obligation to pay any annual dividend unclaimed for five years from the payment date.

Under the Commercial Code, we may pay our dividend only out of the excess of our net assets, on a non-consolidated basis, over the sum of (1) our stated capital and (2) the total amount of our capital surplus reserve and earned surplus reserve (the “Legal Reserve”) accumulated up to the end of the relevant dividend period. In addition, we may not pay any dividend unless we have set aside

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as earned surplus reserve an amount equal to at least 10% of the cash portion of the dividend or unless we have accumulated an earned surplus reserve of not less than one-half of our stated capital. We may not use the Legal Reserve to pay cash dividends but may transfer amounts from the Legal Reserve to share capital or use the Legal Reserve to reduce an accumulated deficit.

Distribution of Free Shares

In addition to paying dividends in Shares out of our retained or current earnings, we may also distribute to our shareholders an amount transferred from the Legal Reserve to our stated capital in the form of free shares. We must distribute such free shares to all our shareholders in proportion to their existing shareholdings.

Preemptive Rights and Issuance of Additional Shares

We may issue authorized but unissued shares at times and, unless otherwise provided in the Commercial Code, on terms our board of directors may determine. Subject to the limitation described in “Limitation on Shareholdings” below, all our shareholders are generally entitled to subscribe for any newly issued Shares in proportion to their existing shareholdings. We must offer new Shares on uniform terms to all shareholders who have preemptive rights and are listed on our shareholders’ register as of the relevant record date. Under the Commercial Code, we may vary, without shareholders’ approval, the terms of these preemptive rights for different classes of shares. We must give notice to all persons who are entitled to exercise preemptive rights regarding new Shares and their transferability at least two weeks before the relevant record date. Our board of directors may determine how to distribute Shares for which preemptive rights have not been exercised or where fractions of Shares occur.

Under the Commercial Code, it is required that the new Shares, convertible bonds or bonds with warrants be issued to persons other than the existing shareholders solely for the purpose of achieving managerial objectives. Under our articles of incorporation, we may issue new Shares pursuant to a board resolution to persons other than existing shareholders, who in these circumstances will not have preemptive rights, if the new Shares are:

• publicly offered pursuant to Articles 4 and 119 of the FSCMA;

• issued to members of our employee stock ownership association;

• represented by depositary receipts;

• issued upon exercise of stock options granted to our officers and employees;

• issued through an offering to public investors pursuant to Article 165-6 of the FSCMA, the amount of which is no more than 10% of the issued Shares;

• issued in order to satisfy specific needs such as strategic alliance, inducement of foreign funds or new technology, improvement of financial structure or other capital raising requirement; or

• issued to domestic or foreign financial institutions when necessary for raising funds in emergency cases.

In addition, we may issue convertible bonds or bonds with warrants, each up to an aggregate principal amount of ￦2,000 billion, to persons other than existing shareholders in the situations described above.

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Members of our employee stock ownership association, whether or not they are our shareholders, generally have a preemptive right to subscribe for up to 20.0% of the Shares publicly offered pursuant to the FSCMA. This right is exercisable only to the extent that the total number of Shares so acquired and held by members of our employee stock ownership association does not then exceed 20.0% of the total number of Shares then issued (including in such total both: (i) all issued and outstanding Shares at the time the preemptive rights are exercised; and (ii) all Shares to be newly issued in the applicable share issuance transaction in connection with which such preemptive rights are exercised). As of December 31, 2018, 0.5% of the issued Shares were held by members of our employee stock ownership association.

Limitations on Shareholding

The Telecommunications Business Act permits maximum aggregate foreign shareholding in us to be 49.0% of our total issued and outstanding Shares with voting rights (including equivalent securities with voting rights, e.g., depositary certificates and certain other equity interests). For the purposes of the foregoing, a shareholder is a “foreign shareholder” if such shareholder is: (1) a foreign person; (2) a foreign government; or (3) a company whose largest shareholder is a foreign person (including any “specially related persons” as determined under the FSCMA) or a foreign government, in circumstances where (i) such foreign person or foreign government holds, in aggregate, 15.0% or more of such company’s total voting shares, and (ii) such company holds at least 1.0% of our total issued and outstanding Shares with voting rights. For the avoidance of doubt, both of conditions (i) and (ii) in the foregoing item (3) must exist for such a company to be counted as a “foreign shareholder” for the purposes of calculating whether the 49.0% foreign shareholding threshold is reached under the Telecommunications Business Act. In addition, the Telecommunications Business Act prohibits a foreign shareholder from being our largest shareholder if such shareholder owns 5.0% or more of our Shares with voting rights. For the purposes of this restriction, any two or more foreign persons or foreign governments who enter into an agreement to act in concert in the exercise of their voting rights will be counted together and prohibited from becoming our largest shareholder in the event that they collectively hold 5.0% or more of our Shares. For the purposes of this restriction under the Foreign Investment Promotion Act, a “foreign shareholder” is defined in the same manner as described above with respect to the foreign shareholding restriction under the Telecommunications Business Act, provided, however, that no exception is made under the Foreign Investment Promotion Act regulations for companies that own less than 1.0% of our Shares (see item (3)(ii) above in this paragraph). A foreigner who has acquired the Shares in excess of such ceiling described above may not exercise its voting rights for shares in excess of such limitation, and the MSIT may require corrective measures to comply with the ownership restrictions.

General Meeting of Shareholders

We hold the annual general meeting of shareholders within three months after the end of each fiscal year. Subject to a board resolution or court approval, we may hold an extraordinary general meeting of shareholders:

• as necessary;

• at the request of shareholders of an aggregate of 3.0% or more of our issued Ordinary Shares;

• at the request of shareholders holding an aggregate of 1.5% or more of our issued Shares for at least six months; or

• at the request of our Audit Committee.

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We must give shareholders written notice setting out the date, place and agenda of the meeting at least two weeks before the date of the general meeting of shareholders. However, for holders of less than 1.0% of the total number of issued and outstanding Ordinary Shares, we may give notice by placing at least two public notices in at least two daily newspapers at least two weeks in advance of the meeting. Currently, we use Seoul Shinmun, Maeil Business Newspaper and The Korea Economic Daily published in Seoul for this purpose. Shareholders not on the shareholders’ register as of the record date are not entitled to receive notice of the general meeting of shareholders or attend or vote at the meeting. Holders of Non-Voting Shares are not entitled to receive notice of general meetings of shareholders, but may attend such meetings.

Our general meetings of shareholders are held at our office in Seoul, or if necessary, may be held elsewhere.

Voting Rights

Holders of our Ordinary Shares are entitled to one vote for each Ordinary Share, except that voting rights of Ordinary Shares held by us, or by a corporate shareholder that is more than 10.0% owned by us either directly or indirectly, may not be exercised. The Commercial Code permits cumulative voting, under which voting method each shareholder has multiple voting rights corresponding to the number of directors to be appointed in the voting and may exercise all voting rights cumulatively to elect one director. Our articles of incorporation permit cumulative voting at our shareholders’ meeting. Under the Commercial Code of Korea, any shareholder holding shares equivalent to not less than 1/100 of the total number of shares issued may apply to us for selecting and appointing such directors by cumulative voting.

Our shareholders may adopt resolutions at a general meeting by an affirmative majority vote of the voting shares present or represented at the meeting, where the affirmative votes also represent at least one-fourth of our total voting shares then outstanding. However, under the Commercial Code and our articles of incorporation, the following matters, among others, require approval by the holders of at least two-thirds of the voting shares present or represented at a meeting, where the affirmative votes also represent at least one-third of our total voting shares then outstanding:

• amending our articles of incorporation;

• removing a director;

• reduction of our share capital;

• effecting any dissolution, merger or consolidation of us;

• transferring the whole or any significant part of our business;

• effecting our acquisition of all of the business of any other company or our acquisition of a part of the business of any other company which will significantly affect our business; or

• issuing any new Shares at a price lower than their par value.

In general, holders of Non-Voting Shares are not entitled to vote on any resolution or receive notice of any general meeting of shareholders. However, in the case of amendments to our articles of incorporation, any merger or consolidation of us, or in some other cases that affect the rights or interests of the Non-Voting Shares, approval of the holders of Non-Voting Shares is required. We may obtain such approval by a resolution of holders of at least two-thirds of the Non-Voting Shares present or represented at a class meeting of the holders of Non-Voting Shares, where the affirmative votes also represent at least one-third of our total outstanding Non-Voting Shares.

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Shareholders may exercise their voting rights by proxy. The proxy must present a document evidencing an appropriate power of attorney prior to the start of the general meeting of shareholders. Additionally, shareholders may exercise their voting rights in absentia by submission of signed write-in voting forms. To make it possible for our shareholders to proceed with voting on a write-in basis, we are required to attach the appropriate write-in voting form and related informational material to the notices distributed to shareholders for convening the relevant general meeting of shareholders. Any of our shareholders who desire to vote on such write-in basis must submit their completed and signed write-in voting forms to us no later than one day prior to the date that the relevant general meeting of shareholders is convened.

Holders of ADRs exercise their voting rights through the ADR depositary, an agent of which is the record holder of the underlying Ordinary Shares. Subject to the provisions of the deposit agreement, ADR holders are entitled to instruct the ADR depositary how to vote the Ordinary Shares underlying their ADSs.

Appraisal Rights of Dissenting Shareholders

In some limited circumstances, including the transfer of the whole or any significant part of our business and our merger or consolidation with another company, dissenting shareholders have the right to require us to purchase their Shares. To exercise this right, shareholders must submit to us a written notice of their intention to dissent before the general meeting of shareholders. Within 20 days after the relevant resolution is passed at a meeting, the dissenting shareholders must request us in writing to purchase their Shares. We are obligated to purchase the Shares of dissenting shareholders within one month after the expiration of the 20-day period. The purchase price for the Shares is required to be determined through negotiation between the dissenting shareholders and us. If we cannot agree on a price through negotiation, the purchase price will be the average of (1) the weighted average of the daily Share prices on the KRX KOSPI Market for the two-month period before the date of the adoption of the relevant board resolution, (2) the weighted average of the daily Share price on the KRX KOSPI Market for the one month period before the date of the adoption of the relevant board resolution and (3) the weighted average of the daily Share price on the KRX KOSPI Market for the one week period before the date of the adoption of the relevant board resolution. However, if we or any of the dissenting shareholders do not accept the purchase price calculated using the above method, the rejecting party may request the court to determine the purchase price. Holders of ADSs will not be able to exercise appraisal rights unless they have withdrawn the underlying ordinary shares and become our direct shareholders.

Register of Shareholders and Record Dates

Our transfer agent, Kookmin Bank, maintains the register of our shareholders at its office in Seoul, Korea. Our transfer agent currently effects transfers of Shares on the register of shareholders upon the presentation of the Share certificates and will, starting from September 16, 2019, effect transfers of Shares on the register of shareholders only upon the electronic registration of such transfers pursuant to the Act on Electronic Registration of Stocks, Bonds, Etc. of Korea (the “Electronic Registration Act”).

The record date for annual dividends is December 31. For the purpose of determining the shareholders entitled to annual dividends, the register of shareholders may be closed for the period from the day after the record date to January 31 of the following year. Further, for the purpose of determining the shareholders entitled to some other rights pertaining to the Shares, we may, on at least two weeks’ public notice, set a record date and/or close the register of shareholders for not more than three months. The trading of Shares and the delivery of share certificates may continue while the register of shareholders is closed.

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Annual Reports

At least one week before the annual general meeting of shareholders, we must make our annual report and audited consolidated financial statements available for inspection at our principal office and at all of our branch offices. In addition, copies of annual reports, the audited consolidated financial statements and any resolutions adopted at the general meeting of shareholders will be available to our shareholders.

Under the FSCMA, we must file with the Financial Services Commission and the KRX KOSPI Market (1) an annual report within 90 days after the end of our fiscal year and (2) interim reports with respect to the three month period, six month period and nine month period from the beginning of each fiscal year within 45 calendar days following the end of each period. Copies of these reports are or will be available for public inspection at the Financial Services Commission and the KRX KOSPI Market.

Transfer of Shares

Under the Commercial Code, the transfer of Shares is currently effected by the delivery of share certificates and will, starting from September 16, 2019, only be effected by the electronic registration of such transfers pursuant to the Electronic Registration Act, under which the electronic registration of stocks, bonds and transfers thereof will be required. To assert shareholders’ rights against us, the transferee must have his name and address registered on our register of shareholders. For this purpose, a shareholder is required to file his name, address and seal with our transfer agent. A non-Korean shareholder may file a specimen signature in place of a seal, unless he is a citizen of a country with a sealing system similar to that of Korea. In addition, a non-resident shareholder must appoint an agent authorized to receive notices on his behalf in Korea and file a mailing address in Korea. The above requirements do not apply to the holders of ADSs.

Under current Korean regulations, Korean securities companies and banks, including licensed branches of non-Korean securities companies and banks, investment management companies, futures trading companies, internationally recognized foreign custodians and the Korea Securities Depository may act as agents and provide related services for foreign shareholders. Certain foreign exchange controls and securities regulations apply to the transfer of Shares by non-residents or non-Koreans. See “Item 10. Additional Information—Item 10.D. Exchange Controls.”

Our transfer agent is Kookmin Bank, located at 26, Gukjegeumyung-ro 8-gil, Yeongdeungpo-gu, Seoul, Korea.

Acquisition of Shares by Us

Under the Commercial Code, we may acquire our own Shares by (i) purchasing on the KRX KOSPI Market, or (ii) purchasing from shareholders on a pro rata basis in accordance with the number of shares held by each shareholder. The aggregate purchase price for the Shares may not exceed the total amount available for distribution of dividends at the end of the preceding fiscal year. Moreover, we must acquire our own Shares from dissenting shareholders who exercise their appraisal rights.

Under the FSCMA, we may acquire Shares only by (i) purchasing on the KRX KOSPI Market, (ii) purchasing from shareholders on a pro rata basis in accordance with the number of shares held by each shareholder, or (iii) receiving Shares returned to us upon the cancellation or termination of a trust agreement with a trustee who acquired the Shares by either of the methods indicated above. The aggregate purchase price for the Shares may not exceed the total amount available for distribution of dividends at the end of the preceding fiscal year.

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In general, corporate entities in which we own a 50.0% or more equity interest may not acquire our Shares.

As of December 31, 2018, there were 15,967,040 treasury shares including shares held by our treasury stock fund.

Liquidation Rights

In the event of our liquidation, after payment of all debts, liquidation expenses and taxes, our remaining assets will be distributed among shareholders in proportion to their shareholdings. Holders of Non-Voting Shares have no preference in liquidation.

Item 10.C.  Material Contracts

None.

Item 10.D.  Exchange Controls

General

The Foreign Exchange Transaction Act and the Presidential Decree and regulations under that Act and Decree (collectively the “Foreign Exchange Transaction Laws”) regulate investment in Korean securities by non-residents and issuance of securities outside Korea by Korean companies. Under the Foreign Exchange Transaction Laws, non-residents may invest in Korean securities only in compliance with the provisions of, and to the extent specifically allowed by, these laws or otherwise permitted by the MOEF. The Financial Services Commission has also adopted, pursuant to its authority under the FSCMA, regulations that control investment by foreigners in Korean securities and regulate the issuance of securities outside Korea by Korean companies.

Under the Foreign Exchange Transaction Laws, if the Government deems that certain emergency circumstances, including, but not limited to, the outbreak of natural calamities, wars or grave and sudden changes in domestic or foreign economies, are likely to occur, the MOEF may temporarily suspend the transactions where Foreign Exchange Transaction Laws are applicable, or impose an obligation to deposit or sell capital to certain Korean governmental agencies or financial institutions. In addition, if the Government deems that it is confronted or is likely to be confronted with serious difficulty in movement of capital between Korea and abroad which will bring serious obstacles in carrying out its currency policies, exchange rate policies and other macroeconomic policies, the MOEF may take measures to require any person who performs transactions to deposit such capital to certain Korean governmental agencies or financial institutions.

Government Review of Issuance of ADSs

In order for us to issue shares represented by ADSs, we are required to file a prior report of the issuance with the MOEF if our securities and borrowings denominated in foreign currencies issued during the one-year period preceding such filing date exceed US$30 million in aggregate. No further Korean governmental approval is necessary for the initial offering and issuance of the ADSs.

Under current Korean laws and regulations, the depositary bank is required to obtain our prior consent for the number of shares to be deposited in any given proposed deposit which exceeds the difference between (1) the aggregate number of shares deposited by us or with the consent of us for the issuance of ADSs (including deposits in connection with the initial and all subsequent offerings of ADSs and stock dividends or other distributions related to these ADSs) and (2) the number of shares

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on deposit with the depositary bank at the time of such proposed deposit. We can give no assurance that we would grant our consent, if our consent is required. Therefore, a holder of ADRs who surrenders ADRs and withdraws shares may not be permitted subsequently to deposit those shares and obtain ADRs.

Reporting Requirements for Holders of Substantial Interests

Any person whose direct or beneficial ownership of shares, whether in the form of shares or ADSs, certificates representing the rights to subscribe for Shares and equity-related debt securities including convertible bonds and bonds with warrants (collectively, the “Equity Securities”) together with the Equity Securities beneficially owned by certain related persons or by any person acting in concert with the person accounts for 5.0% or more of the total issued Equity Securities is required to report the status of the holdings to the Financial Services Commission and the KRX KOSPI Market within five business days after reaching the 5.0% ownership interest. In addition, any change in the ownership interest subsequent to the report which equals or exceeds 1.0% of the total issued Equity Securities is required to be reported to the Financial Services Commission and the KRX KOSPI Market within five business days from the date of the change. The required information to be included in the 5.0% report may be different if the acquisition of such shareholding interest is for the purpose of exercising influence over the management, as opposed to an acquisition for investment purposes. Any person reporting the holding of 5.0% or more of the total issued Equity Securities and any person reporting the change in the ownership interest which equals or exceeds 1.0% of the total issued Equity Securities pursuant to the requirements described above must also deliver a copy of such reports to us.

Violation of these reporting requirements may subject a person to criminal sanctions such as fines or imprisonment and may result in a loss of voting rights with respect to the unreported ownership of Equity Securities exceeding 5.0%. Furthermore, the Financial Services Commission may issue an order to dispose of non-reported Equity Securities.

Restrictions Applicable to ADSs

No Korean governmental approval is necessary for the sale and purchase of ADSs in the secondary market outside Korea or for the withdrawal of shares underlying ADSs and the delivery inside Korea of shares in connection with the withdrawal, provided that a foreigner who intends to acquire the shares must obtain an investment registration certificate from the Financial Supervisory Service as described below. In general, the acquisition of the shares by a foreigner must be reported by the foreigner or his standing proxy in Korea immediately to the Governor of the Financial Supervisory Service; provided, however, that in cases where a foreigner acquires shares through the exercise of rights as a holder of ADSs (or other depositary certificates), the foreigner must cause such report to the Governor of the Financial Supervisory Service to be filed by the Korea Securities Depository.

Persons who have acquired shares as a result of the withdrawal of shares underlying the ADSs may exercise their preemptive rights for new shares, participate in free distributions and receive dividends on shares without any further governmental approval.

Restrictions Applicable to Shares

As a result of amendments to the Foreign Exchange Transaction Laws and Financial Services Commission regulations adopted in connection with the stock market opening from January 1992, which we refer to collectively as the Investment Rules, foreigners may invest, with limited exceptions and subject to procedural requirements, in all shares of Korean companies, whether listed on the KRX KOSPI Market or the KRX KOSDAQ Market, unless prohibited by specific laws. Foreign investors may

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trade shares listed on the KRX KOSPI Market or the KRX KOSDAQ Market only through the KRX KOSPI Market or the KRX KOSDAQ Market, except in limited circumstances, including:

• odd-lot trading of shares;

• acquisition of shares (“Converted Shares”) by exercise of warrant, conversion right under convertible bonds or withdrawal right under depositary receipts issued outside of Korea by a Korean company;

• acquisition of shares as a result of inheritance, donation, bequest or exercise of shareholders’ rights, including preemptive rights or rights to participate in free distributions and receive dividends;

• over-the-counter transactions between foreigners of a class of shares for which the ceiling on aggregate acquisition by foreigners, as explained below, has been reached or exceeded;

• shares acquired by foreign direct investment as defined in the Foreign Investment Promotion Act;

• disposal of shares pursuant to the exercise of appraisal rights of dissenting shareholders;

• disposal of shares in connection with a tender offer;

• acquisition of shares by a foreign depositary in connection with the issuance of depositary receipts;

• acquisition and disposal of shares through overseas stock exchange market if such shares are simultaneously listed on the KRX KOSPI Market or the KRX KOSDAQ Market and such overseas stock exchange;

• acquisition and disposal of shares through alternative trading systems (ATS);

• arm’s length transactions between foreigners, if all of such foreigners belong to an investment group managed by the same person.

For over-the-counter transactions of shares between foreigners outside the KRX KOSPI Market or the KRX KOSDAQ Market for shares with respect to which the limit on aggregate foreign ownership has been reached or exceeded, an investment broker licensed in Korea must act as an intermediary. Odd-lot trading of shares outside the KRX KOSPI Market or the KRX KOSDAQ Market must involve a licensed investment trader in Korea as the other party. Foreign investors are prohibited from engaging in margin transactions through borrowing shares from a securities company with respect to shares which are subject to a foreign ownership limit.

The Investment Rules require a foreign investor who wishes to invest in shares on the KRX KOSPI Market or the KRX KOSDAQ Market (including Converted Shares) to register its identity with the Financial Supervisory Service prior to making any such investment; however, the registration requirement does not apply to foreign investors who acquire Converted Shares with the intention of selling such Converted Shares within three months from the date of acquisition of the Converted Shares or who acquire the shares in an over-the-counter transaction or dispose of shares where such acquisition or disposal is a foreign direct investment as defined in the Foreign Investment Promotion Act. Upon registration, the Financial Supervisory Service will issue to the foreign investor an

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investment registration certificate that must be presented each time the foreign investor opens a brokerage account with a financial investment business entity. Foreigners eligible to obtain an investment registration certificate include foreign nationals who are individuals residing abroad for more than six months, foreign governments, foreign municipal authorities, foreign public institutions, corporations incorporated under foreign laws, international organizations, funds and associations as defined under the FSCMA. All Korean offices of a foreign corporation as a group are treated as a separate entity from the offices of the corporation outside Korea. However, a foreign corporation or depositary bank issuing depositary receipts may obtain one or more investment registration certificates in its name in certain circumstances as described in the relevant regulations.

Upon a foreign investor’s purchase of shares through the KRX KOSPI Market or the KRX KOSDAQ Market, no separate report by the investor is required because the investment registration certificate system is designed to control and oversee foreign investment through a computer system. However, a foreign investor’s acquisition or sale of shares outside the KRX KOSPI Market or the KRX KOSDAQ Market (as discussed above) must be reported by the foreign investor or his standing proxy to the Governor of the Financial Supervisory Service at the time of each such acquisition or sale; provided, however, that in cases where a foreigner acquires shares through the exercise of rights as a holder of ADSs (or other depositary certificates), the foreigner must cause such report to the Governor of the Financial Supervisory Service to be filed by the Korea Securities Depository; and further provided that a foreign investor must ensure that any acquisition or sale by it of shares outside the KRX KOSPI Market or the KRX KOSDAQ Market in the case of trades in connection with a tender offer, odd-lot trading of shares or trades of a class of shares for which the aggregate foreign ownership limit has been reached or exceeded, is reported to the Governor of the Financial Supervisory Service by the investment trader, the investment broker, the Korea Securities Depository or the financial securities company engaged to facilitate such transaction. A foreign investor may appoint one or more standing proxies from among the Korea Securities Depository, foreign exchange banks, including domestic branches of foreign banks, investment traders, investment brokers, the Korea Securities Depository, financial securities companies and internationally recognized custodians that satisfy all relevant requirements under the FSCMA.

Certificates evidencing shares of Korean companies must be kept in custody with an eligible custodian in Korea. Only the Korea Securities Depository, foreign exchange banks including domestic branches of foreign banks, investment traders, investment brokers, collective investment business entities and internationally recognized custodians satisfying the relevant requirements under the FSCMA are eligible to act as a custodian of shares for a non-resident or foreign investor. A foreign investor must ensure that his custodian deposits its shares with the Korea Securities Depository. However, a foreign investor may be exempted from complying with this deposit requirement with the approval of the Governor of the Financial Supervisory Service in circumstances where compliance with that requirement is made impracticable, including cases where compliance would contravene the laws of the home country of such foreign investor.

Under the Investment Rules, with certain exceptions, foreign investors may acquire shares of a Korean company without being subject to any foreign investment ceiling. As one such exception, designated public corporations are subject to a 40.0% ceiling on the acquisition of shares by foreigners in the aggregate and a ceiling on the acquisition of shares by a single foreign investor pursuant to the articles of incorporation of such corporation. Currently, Korea Electric Power Corporation is the only designated public corporation which has set such a ceiling. Furthermore, an investment by a foreign investor of not less than 10.0% of the issued shares with voting rights of a Korean company is defined as a direct foreign investment under the Foreign Investment Promotion Act, which is, in general, subject to the report to, and acceptance, by the Ministry of Trade Industry & Energy. The acquisition of shares of a Korean company by a foreign investor may also be subject to certain foreign shareholding restrictions in the event that the restrictions are prescribed in each specific law which regulates the

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business of the Korean company. A foreigner who has acquired our ordinary shares in excess of this ceiling may not exercise his voting rights with respect to our ordinary shares exceeding the limit.

Under the Foreign Exchange Transaction Laws, a foreign investor who intends to acquire shares must designate a foreign exchange bank at which he must open a foreign currency account and a Won account exclusively for stock investments. No approval is required for remittance into Korea and deposit of foreign currency funds in the foreign currency account. Foreign currency funds may be transferred from the foreign currency account at the time required to place a deposit for, or settle the purchase price of, a stock purchase transaction to a Won account opened at an investment broker or an investment trader. Funds in the foreign currency account may be remitted abroad without any governmental approval.

Dividends on Shares are paid in Won. No governmental approval is required for foreign investors to receive dividends on, or the Won proceeds of the sale of, any shares to be paid, received and retained in Korea. Dividends paid on, and the Won proceeds of the sale of, any shares held by a non-resident of Korea must be deposited either in a Won account with the investor’s investment broker or investment trader or his Won Account. Funds in the investor’s Won Account may be transferred to his foreign currency account or withdrawn for local living expenses up to certain limitations. Funds in the Won Account may also be used for future investment in shares or for payment of the subscription price of new shares obtained through the exercise of preemptive rights.

Investment brokers and investment traders are allowed to open foreign currency accounts with foreign exchange banks exclusively for accommodating foreign investors’ stock investments in Korea. Through these accounts, these investment brokers and investment traders may enter into foreign exchange transactions on a limited basis, such as conversion of foreign currency funds and Won funds, either as a counterparty to or on behalf of foreign investors, without the investors having to open their own accounts with foreign exchange banks.

Item 10.E.  Taxation

The following summary is based upon tax laws of the United States and the Republic of Korea as in effect on the date of this annual report on Form 20-F, and is subject to any change in United States or Korean law that may come into effect after such date. Investors in the ordinary shares or ADSs are advised to consult their own tax advisers as to the United States, Korean or other tax consequences of the purchase, ownership and disposition of such securities, including the effect of any national, state or local tax laws.

Korean Taxation

The following summary of Korean tax considerations applies to you as long as you are not:

• a resident of Korea;

• a corporation organized under Korean law; or

• engaged in a trade or business in Korea through a permanent establishment or a fixed base.

Shares or ADSs

Dividends on Ordinary Shares or ADSs

Unless an applicable tax treaty provides otherwise, we will deduct Korean withholding tax from dividends paid to you either in cash or shares at a rate of 22.0% (including local income tax). If you are

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a resident of a country that has entered into a tax treaty with Korea, you may qualify for a reduced rate of Korean withholding tax under such a treaty. For example, if you are a qualified resident of the United States for purposes of the US-Korea Tax Treaty (the “Treaty”) and you are the beneficial owner of a dividend, a reduced withholding tax rate of 16.5% (including local income tax) generally will apply. You will not be entitled to claim treaty benefits if you are not the beneficial owner of a dividend.

In order to obtain the benefits of a reduced withholding tax rate under a tax treaty, you must submit to us, prior to the dividend payment date, an application for entitlement to a reduced tax rate. If you hold ADSs and receive the dividends through a depositary, you are not required to submit the application for entitlement to a reduced tax rate. If you are an overseas investment vehicle (an “OIV”), which is defined as an organization established in a non-Korean jurisdiction that manages funds collected through investment solicitation by way of acquiring, disposing, or otherwise investing in any such assets and distributes the yield therefrom to investors), you must submit to us a report of the OIV and a schedule of beneficial owners together with their applications for entitlement to a reduced tax rate, which you should collect from each beneficial owner. Excess taxes withheld may be recoverable if you subsequently produce satisfactory evidence that you were entitled to have tax withheld at a lower rate.

If we distribute to you free shares representing a transfer of certain capital reserves or asset revaluation reserves into paid-in capital, that distribution may be a deemed dividend subject to Korean tax.

Capital Gains

Capital gains from a sale of ordinary shares will generally be exempt from Korean taxation if you have owned, together with certain related parties, less than 25.0% of our total issued shares during the year of sale and the five calendar years before the year of sale, and the sale is made through the KRX KOSPI Market, and you have no permanent establishment in Korea. Capital gains earned by a non-Korean holder from a sale of ADSs outside of Korea are exempt from Korean taxation by virtue of the Special Tax Treatment Control Law of Korea (the “STTCL”), provided that the issuance of the ADSs is deemed to be an overseas issuance under the STTCL.

If you are subject to Korean taxation on capital gains from a sale of ADSs, or ordinary shares that you acquired as a result of a withdrawal, your gain will be calculated based on your cost of acquiring the ADSs representing the ordinary shares, although there are no specific Korean tax provisions or rulings on this issue. In the absence of the application of a tax treaty that exempts tax on capital gains, the amount of Korean tax imposed on such capital gains will be the lesser of 11.0% (including local income tax) of the gross realization proceeds or, subject to the production of satisfactory evidence of the acquisition cost and the transaction costs of the ADSs, 22.0% (including local income tax) of the net capital gain.

If you are subject to Korean taxation on capital gains from a sale of ADSs, or ordinary shares that you acquire as a result of a withdrawal, and you sell your ordinary shares or ADSs, the purchaser or, in the case of a sale of ordinary shares on the KRX KOSPI Market or through a licensed securities company in Korea, the licensed securities company, is required to withhold Korean tax from the sales price in an amount equal to 11% (including local income tax) of the gross realization proceeds and to make payment thereof to the Korean tax authorities, unless you establish your entitlement to an exemption from taxation under an applicable tax treaty or produce satisfactory evidence of your acquisition cost and the transaction costs for the ordinary shares or ADSs. In order to obtain the benefit of an exemption from tax pursuant to a tax treaty, you must submit to the purchaser or the securities company (or through the depositary), as the case may be, prior to the first payment, an exemption application, together with a certificate of your tax residence issued by a competent authority of your

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residence country. If you are an OIV, you must submit a report of the OIV and a schedule of beneficial owners together with their applications for exception, which you should collect from each beneficial owner. The withholding obligor must submit the application and the report to the relevant tax office by the ninth day of the month following the date of the first payment of such income. This requirement will not apply to exemptions under Korean tax law. Excess taxes withheld may be recoverable if you subsequently produce satisfactory evidence that you were entitled to have taxes withheld at a lower rate.

Most tax treaties that Korea has entered into provide exemptions for capital gains tax for capital gains from sale of ordinary shares. However, Korea’s tax treaties with Japan, Austria, Spain and a few other countries do not provide an exemption from such capital gains tax. For example, Article 13 of Korea’s tax treaty with Japan provides that if a taxpayer holding 25% or more (including those shares held by any related party of the taxpayer) of total issued shares of a company in a taxable year sells 5% or more (including those sold by any related party of the taxpayer) of total issued shares of the same company in the same taxable year, the country where the company is a resident may impose tax on such taxpayer.

Inheritance Tax and Gift Tax

Korean inheritance tax is imposed upon (a) all assets (wherever located) of the deceased if at the time of his death he was domiciled in Korea or had resided in Korea for at least 183 days immediately prior to his death and (b) all property located in Korea which passes on death (irrespective of the domicile of the deceased). Gift tax is imposed in similar circumstances to the above. Taxes are currently imposed at the rate of 10% to 50% if the value of the relevant property is above a certain limit and vary according to the identity of the parties involved.

Under Korean Inheritance and Gift Tax Law, shares issued by a Korean corporation are deemed located in Korea irrespective of where they are physically located or by whom they are owned. It remains unclear whether, for Korean inheritance and gift tax purposes, a non-resident holder of ADSs will be treated as the owner of the shares underlying the ADSs. If such non-resident is treated as the owner of the shares, the heir or donee of such non-resident (or in certain circumstances, the non-resident as the donor) will be subject to Korean inheritance or gift tax at the same rate as described above.

Securities Transaction Tax

If you transfer ordinary shares on the KRX KOSPI Market, you will be subject to the securities transaction tax at a rate of 0.15% and an agriculture and fishery special tax at a rate of 0.15%, calculated based on the sales price of the shares. If you transfer ordinary shares and your transfer is not made on the KRX KOSPI Market you will generally be subject to the securities transaction tax at a rate of 0.5% and will generally not be subject to the agriculture and fishery special tax.

With respect to transfers of ADSs, a tax ruling issued in 2004 by the Korean tax authority appears to hold that depositary receipts (such as the ADSs) constitute share certificates subject to the securities transaction tax. In May 2007, the Seoul Administrative Court held that depositary receipts do not constitute share certificates subject to the securities transaction tax. In 2008, the Seoul Administrative Court’s holding was upheld by the Seoul High Court and was further upheld by the Supreme Court. Subsequent to this series of rulings, however, the Securities Transaction Tax Law was amended to expressly provide that depositary receipts constituted a form of share certificates subject to the securities transaction tax. However, the sale price of ADSs from a transfer of depositary receipts listed on the New York Stock Exchange, the Nasdaq National Market or other qualified foreign exchanges are exempt from the securities transaction tax.

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United States Federal Income Taxation

The following discussion describes the material United States federal income tax consequences of the ownership of our ADSs and ordinary shares as of the date hereof. This discussion deals only with ADSs and ordinary shares that are held as capital assets by a U.S. Holder (as defined below). In addition, the discussion set forth below is applicable only to U.S. Holders (i) who are residents of the United States for purposes of the current Treaty, (ii) whose ADSs or ordinary shares are not, for purposes of the Treaty, effectively connected with a permanent establishment in Korea and (iii) who otherwise qualify for the full benefits of the Treaty.

For purposes of this summary, a “U.S. Holder” is a beneficial owner of our ADSs or ordinary shares that is:

• a citizen or resident of the United States;

• a United States domestic corporation; or

• otherwise is subject to United States federal income taxation on a net income basis in respect of such ADSs or ordinary shares.

This discussion is based upon provisions of the Internal Revenue Code of 1986, as amended (the “Code”), and regulations, rulings and judicial decisions thereunder as of the date hereof, as well as the Treaty (as defined above).Those authorities may be changed, perhaps retroactively, so as to result in United States federal income tax consequences different from those summarized below. In addition, this discussion is based, in part, upon representations made by the depositary to us and assumes that the deposit agreement, and all other related agreements, will be performed in accordance with their terms.

This discussion does not represent a detailed description of the United States federal income tax consequences applicable to you if you are subject to special treatment under the United States federal income tax laws, including if you are:

• a dealer in securities or currencies;

• a financial institution;

• a regulated investment company;

• a real estate investment trust;

• an insurance company;

• a tax-exempt organization;

• a person holding our ADSs or ordinary shares as part of a hedging, integrated or conversion transaction, a constructive sale or a straddle;

• a trader in securities that has elected the mark-to-market method of accounting for your securities;

• a person liable for alternative minimum tax;

• a person who owns or is deemed to own 10% or more of our stock (by vote or value);

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• a partnership or other pass-through entity for United States federal income tax purposes; or

• a person whose “functional currency” is not the United States dollar.

If a partnership (or other entity treated as a partnership for United States federal income tax purposes) holds our ADSs or ordinary shares, the tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. If you are a partner of a partnership holding our ADSs or ordinary shares, you should consult your tax advisors.

This discussion does not contain a detailed description of all the United States federal income tax consequences to you in light of your particular circumstances and does not address the Medicare contribution tax on net investment income or the effects of any state, local or non-United States tax laws. If you are considering the purchase of our ADSs or ordinary shares, you should consult your own tax advisors concerning the particular United States federal income tax consequences to you of the purchase, ownership and disposition of our ADSs or ordinary shares, as well as the consequences to you arising under other United States federal tax laws and the laws of any other taxing jurisdiction.

ADSs

If you hold ADSs, for United States federal income tax purposes, you generally will be treated as the owner of the underlying ordinary shares that are represented by such ADSs. Accordingly, deposits or withdrawals of ordinary shares for ADSs will not be subject to United States federal income tax. For the remainder of this discussion, references to “ordinary shares” should be interpreted to include ADSs, unless otherwise specified.

Taxation of Dividends

The gross amount of distributions of cash or property with respect to the ordinary shares (including any amounts withheld to reflect Korean withholding taxes) will be taxable as dividends to the extent paid out of our current or accumulated earnings and profits, as determined under United States federal income tax principles. Because we do not expect to determine earnings and profits in accordance with United States federal income tax principles, you should expect that a distribution will generally be treated as a dividend for United States federal income tax purposes.

Any dividends that you receive (including any withheld taxes) will be includable in your gross income as ordinary income on the day actually or constructively received by you, in the case of ordinary shares, or by the depositary, in the case of ADSs. Such dividends will not be eligible for the dividends received deduction allowed to corporations under the Code. With respect to non-corporate United States investors, certain dividends received from a qualified foreign corporation may be subject to preferential rates of taxation. A qualified foreign corporation includes a foreign corporation that is eligible for the benefits of a comprehensive income tax treaty with the United States which the United States Treasury Department determines to be satisfactory for these purposes and which includes an exchange of information provision. The United States Treasury Department has determined that the Treaty meets these requirements, and we believe we are eligible for the benefits of the Treaty.

Non-corporate U.S. Holders will not be eligible for reduced rates of taxation on any dividends received from us if we are a passive foreign investment company in the taxable year in which such dividends are paid or in the preceding taxable year (see “—Passive Foreign Investment Company” below).

The amount of any dividend paid in Won will equal the United States dollar value of the Won received calculated by reference to the exchange rate in effect on the date the dividend is received by

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you, in the case of ordinary shares, or by the depositary, in the case of ADSs, regardless of whether the Won are converted into United States dollars. If the Won received as a dividend are converted into United States dollars on the date they are received, you generally will not be required to recognize foreign currency gain or loss in respect of the dividend income. If the Won received as a dividend are not converted into United States dollars on the date of receipt, you will have a basis in the Won equal to their United States dollar value on the date of receipt. Any gain or loss realized on a subsequent conversion or other disposition of the Won will be treated as United States source ordinary income or loss.

Subject to certain conditions and limitations (including a minimum holding period requirement), Korean withholding taxes on dividends may be treated as foreign taxes eligible for credit against your United States federal income tax liability. For purposes of calculating the foreign tax credit, dividends paid on the ordinary shares will be treated as income from sources outside the United States and will generally constitute passive category income. The rules governing the foreign tax credit are complex. You are urged to consult your tax advisors regarding the availability of the foreign tax credit under your particular circumstances.

Passive Foreign Investment Company

Based on the past and projected composition of our income and assets, and the valuation of our assets we do not believe we were a passive foreign investment company, or PFIC, for our most recent taxable year and do not expect to become a PFIC in the current taxable year or the foreseeable future, although there can be no assurance in this regard.

In general, we will be a PFIC for any taxable year in which:

• at least 75% of our gross income is passive income, or

• at least 50% of the value (determined based on a quarterly average) of our assets is attributable to assets that produce or are held for the production of passive income.

For this purpose, passive income generally includes dividends, interest, royalties and rents (other than royalties and rents derived in the active conduct of a trade or business and not derived from a related person). If we own at least 25% (by value) of the stock of another corporation, for purposes of determining whether we are a PFIC, we will be treated as owning our proportionate share of the other corporation’s assets and receiving our proportionate share of the other corporation’s income.

The determination of whether we are a PFIC is made annually. Accordingly, it is possible that we may become a PFIC in the current or any future taxable year due to changes in our asset or income composition. If we are a PFIC for any taxable year during which you hold our ordinary shares, you will be subject to special tax rules discussed below.

If we are a PFIC for any taxable year during which you hold our ordinary shares and you do not make a timely mark-to-market election, as described below, you will be subject to special tax rules with respect to any “excess distribution” received and any gain realized from a sale or other disposition, including a pledge, of ordinary shares. Distributions received in a taxable year will be treated as excess distributions to the extent that they are greater than 125% of the average annual distributions received during the shorter of the three preceding taxable years or your holding period for the ordinary shares. Under these special tax rules:

• the excess distribution or gain will be allocated ratably over your holding period for the ordinary shares,

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• the amount allocated to the current taxable year, and any taxable year prior to the first taxable year in which we were a PFIC, will be treated as ordinary income, and

• the amount allocated to each other year will be subject to tax at the highest tax rate in effect for that year and the interest charge generally applicable to underpayments of tax will be imposed on the resulting tax attributable to each such year.

Although the determination of whether we are a PFIC is made annually, if we are a PFIC for any taxable year in which you hold our ordinary shares, you will generally be subject to the special tax rules described above for that year and for each subsequent year in which you hold the ordinary shares (even if we do not qualify as a PFIC in such subsequent years). However, if we cease to be a PFIC, you can avoid the continuing impact of the PFIC rules by making a special election to recognize gain as if your ordinary shares had been sold on the last day of the last taxable year during which we were a PFIC. You are urged to consult your own tax advisor about this election.

In lieu of being subject to the special tax rules discussed above, you may make a mark-to-market election with respect to your ordinary shares provided such ordinary shares are treated as “marketable stock.” The ordinary shares generally will be treated as marketable stock if they are regularly traded on a “qualified exchange or other market” (within the meaning of the applicable Treasury regulations).

If you make an effective mark-to-market election, for each taxable year that we are a PFIC you will include as ordinary income the excess of the fair market value of your ordinary shares at the end of the year over your adjusted tax basis in the ordinary shares. You will be entitled to deduct as an ordinary loss in each such year the excess of your adjusted tax basis in the ordinary shares over their fair market value at the end of the year, but only to the extent of the net amount previously included in income as a result of the mark-to-market election. Your adjusted tax basis in the ordinary shares will be increased by the amount of any income inclusion and decreased by the amount of any deductions under the mark-to-market rules. In addition, upon the sale or other disposition of your ordinary shares in a year that we are a PFIC, any gain will be treated as ordinary income and any loss will be treated as ordinary loss, but only to the extent of the net amount of income previously included as a result of the mark-to-market election.

If you make a mark-to-market election, it will be effective for the taxable year for which the election is made and all subsequent taxable years unless the ordinary shares are no longer regularly traded on a qualified exchange or other market, or the Internal Revenue Service (the “IRS”) consents to the revocation of the election. You are urged to consult your tax advisor about the availability of the mark-to-market election, and whether making the election would be advisable in your particular circumstances.

Alternatively, you can sometimes avoid the special tax rules described above by electing to treat a PFIC as a “qualified electing fund” under Section 1295 of the Code. However, this option is not available to you because we do not intend to comply with the requirements necessary to permit you to make this election.

If we are a PFIC for any taxable year during which you hold our ordinary shares and any of our non-United States subsidiaries is also a PFIC, you will be treated as owning a proportionate amount (by value) of the shares of the lower-tier PFIC for purposes of the application of the PFIC rules. You are urged to consult your tax advisors about the application of the PFIC rules to any of our subsidiaries.

You will generally be required to file IRS Form 8621 if you hold our ordinary shares in any year in which we are classified as a PFIC. You are urged to consult your tax advisors concerning the United

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States federal income tax consequences of holding ordinary shares if we are considered a PFIC in any taxable year.

Taxation of Capital Gains

For United States federal income tax purposes, you will recognize taxable gain or loss on any sale or exchange of the ordinary shares in an amount equal to the difference between the amount realized for the ordinary shares and your tax basis in the ordinary shares. Such gain or loss will generally be capital gain or loss and will generally be long-term capital gain or loss if you have held the ordinary shares for more than one year. Long-term capital gains of non-corporate U.S. Holders (including individuals) are eligible for reduced rates of taxation. The deductibility of capital losses is subject to limitations. Any gain or loss recognized by you will generally be treated as United States source gain or loss.

You should note that any Korean securities transaction tax will not be treated as a creditable foreign tax for United States federal income tax purposes, although you may be entitled to deduct such taxes, subject to applicable limitations under the Code. You should consult your own tax advisors regarding the application of the foreign tax credit rules to your investment in, and disposition of, the ordinary shares.

Foreign Financial Asset Reporting

Certain U.S. Holders that own “specified foreign financial assets” with an aggregate value in excess of US$50,000 are generally required to file an information statement along with their tax returns, currently on IRS Form 8938, with respect to such assets. “Specified foreign financial assets” include any financial accounts held at a non-United States financial institution, as well as securities issued by a non-United States issuer that are not held in accounts maintained by financial institutions. The understatement of income attributable to “specified foreign financial assets” in excess of US$5,000 extends the statute of limitations with respect to the tax return to six years after the return was filed. U.S. Holders who fail to report the required information could be subject to substantial penalties. You are encouraged to consult with your own tax advisors regarding the possible application of these rules, including the application of the rules to your particular circumstances.

Information Reporting and Backup Withholding

In general, information reporting will apply to dividends in respect of our ordinary shares and the proceeds from the sale, exchange or other disposition of our ordinary shares that are paid to you within the United States (and in certain cases, outside the United States), unless you are an exempt recipient. A backup withholding tax may apply to such payments if you fail to provide a taxpayer identification number or certification of exempt status or fail to report in full dividend and interest income.

Backup withholding is not an additional tax and any amounts withheld under the backup withholding rules will be allowed as a refund or a credit against your United States federal income tax liability provided the required information is timely furnished to the IRS.

Item 10.F.  Dividends and Paying Agents

See “Item 8. Financial Information—Item 8.A. Consolidated Statements and Other Financial Information—Dividends” for information concerning our dividend policies and our payment of dividends. See “—Item 10.B. Memorandum and Articles of Association—Dividends” for a discussion of the process by which dividends are paid on our ordinary shares. See “Item 12. Description of Securities Other than Equity Securities—Item 12.D. American Depositary Shares” for a discussion of the process by which dividends are paid on our ADSs. The paying agent for payment of our dividends on ADSs in the United States is Citibank, N.A.

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Item 10.G.  Statements by Experts

Not applicable.

Item 10.H.  Documents on Display

We are subject to the information requirements of the U.S. Securities Exchange Act of 1934, as amended, and, in accordance therewith, are required to file reports, including annual reports on Form 20-F, and other information with the U.S. Securities and Exchange Commission. These materials, including this annual report and the exhibits thereto, may be inspected and copied at the Commission’s public reference rooms in Washington, D.C. Please call the Commission at 1-800-SEC-0330 for further information on the public reference rooms. We are required to make filings with the Commission by electronic means, which will be available to the public over the Internet at the Commission’s website at http://www.sec.gov.

Item 10.I.  Subsidiary Information

Not applicable.

Item 11.  Quantitative and Qualitative Disclosures About Market Risk

We are exposed to foreign exchange rate and interest rate risks primarily associated with underlying liabilities, and to equity price risk as a result of our investment in equity securities. Our long-term financial policies are annually reported to our Board of Directors, and our finance division conducts financial risk management and assessment. Upon identification and evaluation of our risk exposures, we, having considered various circumstances, enter into derivative financial instruments to try to manage some of such risks. These contracts are entered into with major financial institutions, thereby minimizing the risk of credit loss. The activities of our finance division are subject to policies approved by our foreign exchange and interest rate risk management committee. These policies address the use of derivative financial instruments, including the approval of counterparties, setting of limits and investment of excess liquidity. Our general policy is to hold or issue derivative financial instruments largely for hedging purposes.

For our hedging derivative contracts, we recognized a valuation gain of ￦109 billion, a valuation loss of ￦0.1 billion and accumulated other comprehensive income of ￦85 billion in 2016 and a valuation gain of ￦0.1 billion, a valuation loss of ￦210 billion and accumulated other comprehensive loss of ￦147 billion in 2017 and a valuation gain of ￦66 billion, a valuation loss of ￦2 billion and accumulated other comprehensive income of ￦22 billion in 2018. For further details regarding the assets, liabilities, gains and losses recorded relating to our derivative contracts outstanding as of December 31, 2016, 2017 and 2018, see Note 7 to the Consolidated Financial Statements.

Exchange Rate Risk

Most of our cash flow is denominated in Won. We are exposed to foreign exchange risk related to foreign currency denominated liabilities and anticipated foreign exchange payments. Anticipated foreign exchange payments, mostly in U.S. Dollars, relate primarily to payments of foreign currency denominated debt, net settlements paid to foreign telecommunication carriers and payments for equipment purchased from foreign suppliers. We have entered into several currency swap contracts, combined interest currency swap contracts and currency forward contracts to hedge our foreign currency risks.

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The following table shows our assets and liabilities denominated in foreign currency as of December 31, 2016, 2017 and 2018:

	As of December 31,
	2016				2017				2018
(in thousands of foreign currencies)	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
U.S. Dollar		210,474		2,536,090		236,476		1,908,831		279,327		1,893,782
Special Drawing Right		311		737		306		738		267		730
Japanese Yen		80,555		21,802,051		28,267		21,801,443		66,078		50,000,000
British Pound		1		151		—		74		—		256
Euro		40		2,571		186		3,625		2		6
Algerian Dinar		471		—		47		—		618		—
Chinese Yuan		15,262		381		46,555		10		16,315		271
Uzbekistani Sum		39,531		—		136,787		—		121,053		—
Rwandan Franc		1,203		—		3,346		—		857		—
Thai Bhat		—		—		—		—		1,685		1,685
Indonesian Rupiah		15,646,011		53,142,167		14,886,393		710,162		64,240,286		41,510,330
Myanmar Kyat		2,750		—		84		—		84		—
Tanzanian Shilling		29,987		—		317,348		—		—		2,876
Botswana Pula		15		—		42		—		897		—
Hong Kong Dollar		254		—		—		—		—		—
Bangladeshi Taka		69,473		—		38,074		—		39,494		—
Polish Zloty		106,025		—		338		—		26		—
Vietnamese Dong		515,412		—		311,649		—		467,272		—
Central African Franc		—		—		—		—		666		—
Swiss Franc		—		—		—		12		—		—

As of December 31, 2016 and 2017, a 10% increase in the exchange rate between the Won and all foreign currencies, with all other variables held constant, would have decreased our income before income tax by ￦28 billion and ￦10 billion, respectively, and total equity by ￦24 billion and ￦7 billion, respectively, with a 10% decrease in the exchange rate having the opposite effect. As of December 31, 2018, a 10% increase in the exchange rate between the Won and all foreign currencies, with all other variables held constant, would have decreased our income before income tax by ￦2 billion and increased total equity by ￦0.6 billion, and a 10% decrease would have decreased our income before income tax by ￦3 billion and total equity by ￦0.06 billion. The foregoing sensitivity analysis assumes that all variables other than foreign exchange rates are held constant, and as such, does not reflect any correlation between foreign exchange rates and other variables, nor our decision to decrease the risk. See Note 36 to the Consolidated Financial Statements.

Interest Rate Risk

We are also subject to market risk exposure arising from changing interest rates. A reduction of interest rates increases the fair value of our debt portfolio, which is primarily of a fixed interest nature. We use, to a limited extent, interest rate swap contracts and combined interest rate and currency swap contracts to reduce interest rate volatility on some of our debt and manage our interest expense by achieving a balanced mixture of floating and fixed rate debt. We entered into several interest rate swap contracts in which we exchange fixed interest rate payments with variable interest rate payments for a specified period, as well as entered into the combined interest rate and currency swap contracts to hedge our interest rate risk.

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The following table summarizes the principal amounts, fair values, principal cash flows by maturity date and weighted average interest rates of our short-term and long-term liabilities as of December 31, 2018 which are sensitive to exchange rates and/or interest rates. The information is presented in Won, which is our reporting currency:

																December 31, 2018
	2019			2020			2021			2022			Thereafter			Total			Fair Value
	(in millions of Won, except rates)
Local currency:
Fixed rate		970,832			504,218			1,149,218			11,442			1,781,981			4,417,691			4,448,167
Average weighted rate (1)		3.05	%		3.29	%		3.91	%		4.45	%		3.06	%		3.31	%		—
Variable rate		—			—			—			—			—			—			—
Average weighted rate (1)		—			—			—			—			—			—			—
Sub-total		970,832			504,218			1,149,218			11,442			1,781,981			4,417,691			4,448,167
Foreign currency:
Fixed rate		391,335			344,481			162,109			447,240			559,050			1,904,215			1,905,567
Average weighted rate (1)		2.63	%		0.30	%		0.38	%		2.62	%		3.30	%		2.21	%		—
Variable rate		6,709			226,974			—			—			111,810			345,493			345,035
Average weighted rate (1)		3.51	%		3.21	%		—			—			3.71	%		3.38	%		—
Subtotal		398,044			571,455			162,109			447,240			670,860			2,249,708			2,250,602
Total		1,368,876			1,075,673			1,311,327			458,682			2,452,841			6,667,399			6,698,769

(1) Weighted average rates of the portfolio at the period end.

As of December 31, 2016, 2017 and 2018, a 100 basis point increase in the market interest rate, with all other variables held constant, would have decreased our profit before income tax by ￦3 billion, increased our profit before income tax by ￦2 billion and increased our profit before income tax by ￦1 billion, respectively. As of December 31, 2016, 2017 and 2018, such increase, with all other variables held constant, would have decreased our shareholders’ equity by ￦2 billion, increased our shareholders’ equity by ￦5 billion and increased our shareholders’ equity by ￦10 billion, respectively.

As of December 31, 2016, 2017 and 2018, a 100 basis point decrease in the market interest rates, with all other variables held constant, would have increased our profit before income tax by ￦3 billion, decreased our profit before income tax by ￦2 billion and decreased our profit before income tax by ￦2 billion, respectively. As of December 31, 2016, 2017 and 2018, a 100 basis point decrease in the market interest rates, with all other variables held constant, would have decreased our shareholders’ equity by ￦5 billion, ￦5 billion and ￦10 billion, respectively. The foregoing sensitivity analysis assumes that all variables other than market interest rates are held constant, and as such, does not reflect any correlation between market interest rates and other variables, nor our decision to decrease the risk, but reflects the effects of derivative contracts in place at the time of conducting the analysis.

Equity Price Risk

We are also subject to market risk exposure arising from changes in the equity securities market, which affect the fair value of our equity portfolio. As of December 31, 2016, 2017 and 2018, a 10% increase in the equity indices where our marketable equity securities are listed, with all other variables held constant, would have increased our total equity by ￦0.5 billion, ￦0.7 billion and ￦0.9 billion, respectively, with a 10% decrease in the equity index having the opposite effect. The foregoing sensitivity analysis assumes that all variables other than changes in the equity index are held constant, and that our marketable equity instruments had moved according to the historical correlation to the index, and as such, does not reflect any correlation between the equity index and other variables.

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Item 12.  Description of Securities Other than Equity Securities

Item 12.A.  Debt Securities

Not applicable.

Item 12.B.  Warrants and Rights

Not applicable.

Item 12.C.  Other Securities

Not applicable.

Item 12.D.  American Depositary Shares

Fees and Charges

Under the terms of the deposit agreement, holders of our ADSs are required to pay the following service fees to the depositary:

Services	Fees
Issuance of ADSs upon deposit of shares	Up to $0.05 per ADS issued
Delivery of deposited shares against surrender of ADSs	Up to $0.05 per ADS surrendered
Distribution delivery of ADSs pursuant to sale or exercise of rights	Up to $0.02 per ADS held
Distributions of dividends	None
Distribution of securities other than ADSs	Up to $0.02 per ADS held
Other corporate action involving distributions to shareholders	Up to $0.02 per ADS held

Holders of our ADSs are also responsible for paying certain fees and expenses incurred by the depositary and certain taxes and governmental charges such as:

• fees for the transfer and registration of shares charged by the registrar and transfer agent for the shares in Korea (i.e., upon deposit and withdrawal of shares);

• expenses incurred for converting foreign currency into U.S. dollars;

• expenses for cable, telex and fax transmissions and for delivery of securities;

• taxes and duties upon the transfer of securities (i.e., when shares are deposited or withdrawn from deposit); and

• fees and expenses incurred in connection with the delivery or servicing of shares on deposit.

Depositary fees payable upon the issuance and surrender of ADSs are typically paid to the depositary by the brokers (on behalf of their clients) receiving the newly issued ADSs from the depositary and by the brokers (on behalf of their clients) delivering the ADSs to the depositary for surrender. The brokers in turn charge these fees to their clients. Depositary fees payable in connection with distributions of cash or securities to ADS holders and the depositary services fee are charged by the depositary to the holders of record of ADSs as of the applicable ADS record date.

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The depositary fees payable for cash distributions are generally deducted from the cash being distributed. In the case of distributions other than cash (i.e., stock dividend rights), the depositary charges the applicable fee to the ADS record-date holders concurrent with the distribution. In the case of ADSs registered in the name of the investor (whether certificated or uncertificated in direct registration), the depositary sends invoices to the applicable record-date ADS holders. In the case of ADSs held in brokerage and custodian accounts (via the Depository Trust Company, or DTC), the depositary generally collects its fees through the systems provided by DTC (whose nominee is the registered holder of the ADSs held in DTC) from the brokers and custodians holding ADSs in their DTC accounts. The brokers and custodians who hold their clients’ ADSs in DTC accounts in turn charge their clients’ accounts the amount of the fees paid to the depositary.

In the event of refusal to pay the depositary fees, the depositary may, under the terms of the deposit agreement, refuse to provide the requested service until payment is received or may set off the amount of the depositary fees from any distribution to be made to such holder of ADSs.

The fees and charges that holders of our ADSs may be required to pay may vary over time and may be changed by us and by the depositary. Holders of our ADSs will receive prior notice of such changes.

Fees and Payments from the Depositary to Us

In 2018, we received the following payments, after deduction of applicable U.S. taxes, from the depositary:

Reimbursement of NYSE listing fees	$	219,842.29
Reimbursement of SEC filing fees	$	5,874.05
Reimbursement of settlement infrastructure fees (including maintenance fees)	$	126,326.42
Reimbursement of proxy process expenses (printing, postage and distribution)	$	28,927.96
Reimbursement of legal fees (reimbursement received in April 2017 in respect of 2016)	$	3,522.00
Contributions toward our investor relations efforts (including non-deal roadshows, investor conferences and investor relations agency fees)	$	204,038.27

112

PART II

Item 13.  Defaults, Dividend Arrearages and Delinquencies

Not applicable.

Item 14.  Material Modifications to the Rights of Security Holders and Use of Proceeds

Not applicable.

Item 15.  Controls and Procedures

Disclosure Controls and Procedures

Our management has evaluated, with the participation of our chief executive officer and chief financial officer, the effectiveness of our disclosure controls and procedures, as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as of December 31, 2018. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based upon our evaluation, our chief executive officer and chief financial officer concluded that our disclosure controls and procedures were effective as of December 31, 2018. Our disclosure controls and procedures are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Commission’s rules and forms. Our disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our chief executive officer and chief financial officer, as appropriate to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control over financial reporting is a process designed by, and under the supervision of, our principal executive, principal operating and principal financial officers, and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles.

Our internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records, that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting is not intended to provide absolute assurance that a misstatement of our financial statements would be prevented or detected. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

113

Our management has performed an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2018, utilizing the criteria discussed in the Internal Control—Integrated Framework 2013 issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this assessment, we concluded that our internal control over financial reporting was effective as of December 31, 2018.

Samil PricewaterhouseCoopers, an independent registered public accounting firm, which also audited our consolidated financial statements as of, and for the year ended December 31, 2018, as stated in their report which is included herein, has issued an attestation report on the effectiveness of our internal control over financial reporting.

Attestation Report of the Registered Public Accounting Firm

The attestation report of our independent registered public accounting firm on the effectiveness of our internal control over financial reporting is furnished in Item 18 of this Form 20-F.

Changes in Internal Control Over Financial Reporting

There has been no change in our internal control over financial reporting during 2018 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 16.  [Reserved]

Item 16A.  Audit Committee Financial Expert

Our Audit Committee is comprised of Suk-Gwon Chang, Jong-Gu Kim, Dae-You Kim and Il Im. The board of directors has determined that Suk-Gwon Chang is the financial expert of the Audit Committee. Suk-Gwon Chang is independent as such term is defined in Section 303A.02 of the NYSE Listed Company Manual, Rule 10A-3 under the Exchange Act and the Korea Stock Exchange listing standards.

Item 16B.  Code of Ethics

We have adopted a code of ethics, as defined in Item 16B. of Form 20-F under the Securities Exchange Act of 1934, as amended. Our code of ethics applies to our chief executive officer, chief financial officer and persons performing similar functions, as well as to our directors, other officers and employees. Our code of ethics is available on our web site at www.kt.com. If we amend the provisions of our code of ethics that apply to our chief executive officer, chief financial officer and persons performing similar functions, or if we grant any waiver of such provisions, we will disclose such amendment or waiver on our website.

114

Item 16C.  Principal Accountant Fees and Services

Audit and Non-Audit Fees

The following table sets forth the fees billed to us by Samil PricewaterhouseCoopers, our independent registered public accounting firm, during the fiscal year ended December 31, 2017 and 2018. Such fees exclude the fees billed for work associated with our foreign subsidiaries which Samil PricewaterhouseCoopers did not provide services and with our former subsidiaries.

	Year Ended December 31,
	2017		2018
	(In millions)
Audit fees (1)	￦	3,373	￦	3,225
Audit-related fees		—		—
Tax fees (2)		68		104
All other fees		—		—
Total fees	￦	3,441		3,329

(1) Audit fees consist of fees for the annual audit and quarterly review services engagement and the comfort letters.

(2) Tax fees consist of fee for tax services which are mainly the preparation or non-recurring tax compliance review of original or amended tax returns.

Audit Committee Pre-Approval Policies and Procedures

Our Audit Committee has established pre-approval policies and procedures to pre-approve all audit services to be provided by Samil PricewaterhouseCoopers, our independent registered public accounting firm. Our Audit Committee’s policy regarding the pre-approval of non-audit services to be provided to us by our independent registered public accounting firm is that all such services shall be pre-approved by our Audit Committee. Non-audit services that are prohibited to be provided to us by our independent registered public accounting firm under the rules of the SEC and applicable law may not be pre-approved. In addition, prior to the granting of any pre-approval, our Audit Committee must be satisfied that the performance of the services in question will not compromise the independence of our independent registered public accounting firm and does not include delegation of the Audit Committee’s responsibilities to the management under the Securities Exchange Act of 1934, as amended.

Our Audit Committee did not pre-approve any non-audit services under the de minimis exception of Rule 2-01 (c)(7)(i)(C) of Regulation S-X as promulgated by the SEC.

Item 16D.  Exemptions from the Listing Standards for Audit Committees

Not applicable.

115

Item 16E.  Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The following table sets forth the repurchases of ordinary shares by us or any affiliated purchasers during the fiscal year ended December 31, 2018:

Period	Total Number of Shares Purchased		Average Price Paid per Share (In Won)		Total Number of Shares Purchased as Part of Publicly Announced Plans		Maximum Number of Shares that May Yet be Purchased Under the Plans
January 1 to January 31		—		—		—		—
February 1 to February 29		—		—		—		—
March 1 to March 31		—		—		—		—
April 1 to April 30		—		—		—		—
May 1 to May 31		—		—		—		—
June 1 to June 30		—		—		—		—
July 1 to July 31		—		—		—		—
August 1 to August 31		680,000		28,759		680,000		167,620
September 1 to September 30		167,620		28,884		167,620		—
October 1 to October 31		—		—		—		—
November 1 to November 30		—		—		—		—
December 1 to December 31		—		—		—		—
Total		847,620		28,784		847,620		167,620

Neither we nor any “affiliated purchaser,” as defined in Rule 10b-18(a)(3) of the Exchange Act, purchased any of our equity securities during the period covered by this annual report.

Item 16F.  Change in Registrant’s Certifying Accountant

Not applicable.

Item 16G.  Corporate Governance

The following is a summary of the significant differences between the New York Stock Exchange’s corporate governance standards and those that we follow under Korean law:

NYSE Corporate Governance Standards	KT Corporation’s Corporate Governance Practice
Director Independence
Independent directors must comprise a majority of the board.	The Commercial Code of Korea requires that our board of directors must comprise no less than a majority of outside directors. Our outside directors must meet the criteria for outside directorship set forth under the Commercial Code of Korea. The majority of our board of directors is independent (as defined in accordance with the New York Stock Exchange’s standards), and 8 out of 11 directors are outside directors.
Nominating/Corporate Governance Committee
Listed companies must have a nominating/corporate governance committee composed entirely of independent directors.	We have not established a nominating/corporate governance committee composed entirely of independent directors. However, we maintain an Outside Director Candidate Nominating Committee composed of all of our outside directors and one standing director. We also maintain a Corporate Governance Committee comprised of four outside directors and one standing director. The committee is responsible for the review of matters with respect to our Corporate Governance Guidelines and our performance under such guidelines to monitor effectiveness of our corporate governance.

116

Compensation Committee
Listed companies must have a compensation committee composed entirely of independent directors.	We maintain an Evaluation and Compensation Committee composed of four outside directors.
Executive Session
Non-management directors must meet in regularly scheduled executive sessions without management.	Our outside directors hold meetings solely attended by outside directors in accordance with the charter of our board of directors.
Audit Committee
Listed companies must have an audit committee which has a minimum of three directors and satisfy the requirements of Rule 10A-3 under the Exchange Act.	We maintain an Audit Committee comprised of four outside directors who meet the applicable independence criteria set forth under Rule 10A-3 under the Exchange Act.
Shareholder Approval of Equity Compensation Plan
Listed companies must allow their shareholders to exercise their voting rights with respect to any material revision to the company’s equity compensation plan.	We currently have two equity compensation plans: one providing for the grant of stock options to officers and standing directors; and an employee stock ownership association program. All material matters related to the granting stock options are provided in our articles of incorporation, and any amendments to the articles of incorporation are subject to shareholders’ approval. Matters related to the employee stock ownership association program are not subject to shareholders’ approval under Korean law.
Shareholder Approval of Equity Offerings
Listed companies must allow its shareholders to exercise their voting rights with respect to equity offerings that do not qualify as public offerings for cash, and offerings of equity of related parties.	Voting rights are not separately provided for equity offerings that do not qualify as public offerings for cash, or offerings of equity of related parties.
Corporate Governance Guidelines
Listed companies must adopt and disclose corporate governance guidelines.	We have adopted Corporate Governance Guidelines in March 2007 setting forth our practices with respect to corporate governance matters. Our Corporate Governance Guidelines are in compliance with Korean law but do not meet all requirements established by the New York Stock Exchange for U.S. companies listed on the exchange. A copy of our Corporate Governance Guidelines in Korean is available on our website at www.kt.com.
Code of Business Conduct and Ethics
Listed companies must adopt and disclose a code of business conduct and ethics for directors, officers and employees, and promptly disclose any waivers of the code for executive officers.	We have adopted a Code of Ethics for all directors, officers and employees. A copy of our Code of Ethics in Korean is available on our website at www.kt.com

Item 16H.  Mine Safety Disclosure

Not applicable.

117

PART III

Item 17.  Financial Statements

Not applicable.

Item 18.  Financial Statements

AUDITED CONSOLIDATED ANNUAL FINANCIAL STATEMENTS OF KT CORPORATION

	Page
Report of Independent Registered Public Accounting Firm		F-2
Consolidated Statements of Financial Position as of January 1, 2017, December 31, 2017 and December 31, 2018		F-4
Consolidated Statements of Operations for the Years Ended December  31, 2016, 2017 and 2018		F-6
Consolidated Statements of Comprehensive Income for the Years Ended December  31, 2016, 2017 and 2018		F-7
Consolidated Statements of Changes in Equity for the Years Ended December  31, 2016, 2017 and 2018		F-8
Consolidated Statements of Cash Flows for the Years Ended December  31, 2016, 2017 and 2018		F-11
Notes to the Consolidated Financial Statements		F-12

Item 19. Exhibits

1	Articles of Incorporation of KT Corporation (English translation)
2.1*	Deposit Agreement dated as of May  25, 1999 entered into among KT Corporation, Citibank, N.A., as depositary, and all Holders and Beneficial Owners of American Depositary Shares evidenced by the American Depositary Receipts issued thereunder, including the form of American depositary receipt (incorporated herein by reference to Exhibit (a)(i) of the Registrant’s Registration Statement (Registration No. 333-13578) on Form F-6)
2.2*	Form of Amendment No. 1 Deposit Agreement dated as of May  25, 1999 entered into among KT Corporation, Citibank, N.A., as depositary, and all Holders and Beneficial Owners of American Depositary Shares evidenced by the American Depositary Receipts issued thereunder, including the form of American depositary receipt (incorporated herein by reference to Exhibit (a)(ii) of the Registrant’s Registration Statement (Registration No. 333-13578) on Form F-6)
2.3*	Letter from Citibank, N.A., as depositary, to the Registrant relating to the pre-release of the American depositary receipts (incorporated herein by reference to the Registrant’s Registration Statement (Registration No. 333-10330) on Form F-6) (P)
2.4*	Letter from Citibank, N.A., as depositary, to the Registrant relating to the establishment of a direct registration system for ADSs and the issuance of uncertified ADSs as part of the direct registration system. (incorporated herein by reference to Exhibit 2.4 of the Registrant’s Annual Report on Form 20-F filed on June 30, 2008)
8.1	List of subsidiaries of KT Corporation
12.1	Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
12.2	Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
13.1	Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	Interactive Data Files (XBRL-Related Documents)

* Filed previously.

(P) Paper filing.

118

SIGNATURES

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.

KT CORPORATION

(Registrant)

/s/ CHANG-GYU HWANG

Name: Chang-Gyu Hwang

Title: Chief Executive Officer

Date: April 30, 2019

119

INDEX TO FINANCIAL STATEMENTS

	Page
Report of Independent Registered Public Accounting Firm		F-2
Consolidated Statements of Financial Position as of January 1, 2017, December 31, 2017 and December 31, 2018		F-4
Consolidated Statements of Operations for the Years Ended December  31, 2016, 2017 and 2018		F-6
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2016, 2017 and 2018		F-7
Consolidated Statements of Changes in Equity for the Years Ended December  31, 2016, 2017 and 2018		F-8
Consolidated Statements of Cash Flows for the Years Ended December  31, 2016, 2017 and 2018		F-11
Notes to the Consolidated Financial Statements		F-12

F-1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Stockholders of KT Corporation

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of financial position of KT Corporation and its subsidiaries (the “Company”) as at December 31, 2018 and 2017, and the related consolidated statements of operations, of comprehensive income, of changes in equity and of cash flows for each of the three years in the period ended December 31, 2018, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as at December 31, 2018, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as at December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2018 in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as at December 31, 2018, based on criteria established in Internal Control—Integrated Framework (2013) issued by the COSO.

Change in Accounting Principles

As discussed in Note 41 to the consolidated financial statements, the Company changed the manner in which it accounts for revenue from contracts with customers and the manner in which it accounts for financial instruments in 2018.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the Management’s Annual Report on Internal Control Over Financial Reporting appearing under Item 15. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and

F-2

evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/    Samil PricewaterhouseCoopers

Seoul, Korea

April 30, 2019

We have served as the Company’s auditor since 2010.

F-3

KT Corporation and Subsidiaries

Consolidated Statements of Financial Position

January 1, 2017, December 31, 2017 and December 31, 2018

(In millions of Korean won)	Notes	January 1, 2017		December 31, 2017		December 31, 2018
Assets
Current assets
Cash and cash equivalents	4,5	￦	2,900,311	￦	1,928,182	￦	2,703,422
Trade and other receivables, net	4,6		5,477,634		5,964,565		5,680,349
Other financial assets	4,7		720,555		972,631		994,780
Current income tax assets			2,079		9,030		4,046
Inventories, net	8		454,588		642,027		1,074,634
Current assets held for sale	10		—		7,230		13,035
Other current assets	9		311,135		304,860		1,687,548
Total current assets			9,866,302		9,828,525		12,157,814
Non-current assets
Trade and other receivables, net	4,6		709,011		828,832		842,995
Other financial assets	4,7		664,726		754,992		623,176
Property and equipment, net	11, 21		14,312,111		13,562,319		13,068,257
Investment properties, net	12		1,148,044		1,189,531		1,091,084
Intangible assets, net	13		3,022,803		2,632,704		3,407,123
Investments in associates and joint ventures	14		284,075		279,431		272,407
Deferred income tax assets	29		701,409		712,222		465,369
Other non-current assets	9		106,099		107,165		545,895
Total non-current assets			20,948,278		20,067,196		20,316,306
Total assets		￦	30,814,580	￦	29,895,721	￦	32,474,120

F-4

KT Corporation and Subsidiaries

Consolidated Statements of Financial Position (Continued)

January 1, 2017, December 31, 2017 and December 31, 2018

(In millions of Korean won)	Notes	January 1, 2017			December 31, 2017			December 31, 2018
Liabilities
Current liabilities
Trade and other payables	4,15	￦	7,141,725		￦	7,426,088		￦	7,007,515
Borrowings	4,16		1,820,001			1,573,474			1,368,481
Other financial liabilities	4,7		233			37,224			942
Current income tax liabilities	29		102,843			82,984			249,837
Provisions	17		96,485			78,172			117,881
Deferred revenue			35,617			17,906			52,878
Other current liabilities	9		342,291			258,314			596,589
Total current liabilities			9,539,195			9,474,162			9,394,123
Non-current liabilities
Trade and other payables	4,15		1,188,311			1,001,369			1,513,864
Borrowings	4,16		6,300,790			5,110,188			5,279,812
Other financial liabilities	4,7		108,431			149,267			163,454
Defined benefit liabilities, net	18		378,404			395,079			561,269
Provisions	17		100,694			124,858			163,995
Deferred revenue			85,372			91,698			110,702
Deferred income tax liabilities	29		137,680			128,462			204,785
Other non-current liabilities	9		58,761			237,284			423,626
Total non-current liabilities			8,358,443			7,238,205			8,421,507
Total liabilities			17,897,638			16,712,367			17,815,630
Equity
Share capital	22		1,564,499			1,564,499			1,564,499
Share premium			1,440,258			1,440,258			1,440,258
Retained earnings	23		9,778,707			9,961,150			11,256,069
Accumulated other comprehensive income	24		(1,432	)		30,985			50,158
Other components of equity	24		(1,217,934	)		(1,205,302	)		(1,181,083	)
Equity attributable to owners of the Controlling Company			11,564,098			11,791,590			13,129,901
Non-controlling interest			1,352,844			1,391,764			1,528,589
Total equity			12,916,942			13,183,354			14,658,490
Total liabilities and equity		￦	30,814,580		￦	29,895,721		￦	32,474,120

The above consolidated statements of financial position should be read in conjunction with the accompanying notes.

F-5

KT Corporation and Subsidiaries

Consolidated Statements of Operations

Years ended December 31, 2016, 2017 and 2018

(In millions of Korean won, except per share amounts)	Notes	2016			2017			2018
Operating revenue	26	￦	23,164,202		￦	23,546,929		￦	23,436,050
Revenue			22,798,330			23,259,541			23,220,052
Others			365,872			287,388			215,998
Operating expenses	27		21,781,098			22,477,837			22,335,190
Operating profit			1,383,104			1,069,092			1,100,860
Finance income	28		296,139			406,328			374,243
Finance costs	28		(515,087	)		(644,531	)		(435,659	)
Share of net profit (losses) of associates and joint venture	14		2,599			(13,892	)		(5,467	)
Profit before income tax			1,166,755			816,997			1,033,977
Income tax expense	29		334,910			270,656			314,565
Profit for the year		￦	831,845		￦	546,341		￦	719,412
Profit for the year attributable to:
Owners of the Controlling Company		￦	745,090		￦	461,559		￦	645,571
Non-controlling interest		￦	86,755		￦	84,782		￦	73,841
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	30	￦	3,043		￦	1,884		￦	2,634
Diluted earnings per share	30	￦	3,041		￦	1,883		￦	2,634

The above consolidated statements of operations should be read in conjunction with the accompanying notes.

F-6

KT Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

Years ended December 31, 2016, 2017 and 2018

(In millions of Korean won)
	Notes		2016			2017			2018
Profit for the year			￦	831,845		￦	546,341		￦	719,412
Other comprehensive income
Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability		18		4,213			(83,962	)		(73,511	)
Shares of remeasurement gain (loss) of associates and joint ventures				116			(115	)		(816	)
Gain on valuation of equity instruments at fair value through other comprehensive income				—			—			43,077
Items that may be subsequently reclassified to profit or loss:
Gain on valuation of debt instruments at fair value through other comprehensive income				—			—			734
Changes in value of available-for-sale financial assets				10,925			51,235			—
Other comprehensive income from available-for sale financial assets reclassified to loss				(3,840	)		(55,450	)		—
Valuation gain (loss) on cash flow hedge				64,796			(111,083	)		17,268
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)				(75,871	)		141,929			(44,279	)
Share of other comprehensive income (loss) from associates and joint ventures				(602	)		10,280			(41	)
Exchange differences on translation of foreign operations				(5,407	)		(21,122	)		2,940
Total other comprehensive loss				(5,670	)		(68,288	)		(54,628	)
Total comprehensive income for the year			￦	826,175		￦	478,053		￦	664,784
Total comprehensive income for the year attributable to:
Owners of the Controlling Company				738,413			413,149			589,179
Non-controlling interest				87,762			64,904			75,605

The above consolidated statements of comprehensive income should be read in conjunction with the accompanying notes.

F-7

KT Corporation and Subsidiaries

Consolidated Statements of Changes in Equity

Years ended December 31, 2016, 2017 and 2018

		Attributable to owners of the Controlling Company
(In millions of Korean won)	Notes	Share capital		Share premium		Retained earnings			Accumulated other comprehensive income			Other components of equity			Total			Non-controlling interest			Total equity
Balance as at December 31, 2015		￦	1,564,499	￦	1,440,258	￦	9,049,971		￦	13,870		￦	(1,232,863	)	￦	10,835,735		￦	1,320,396		￦	12,156,131
Adjustments from prior years	2.1		—		—		97,496			—			—			97,496			—			97,496
Balance as at January 1, 2016		￦	1,564,499	￦	1,440,258	￦	9,147,467		￦	13,870		￦	(1,232,863	)	￦	10,933,231		￦	1,320,396		￦	12,253,627
Comprehensive income
Profit for the year			—		—		745,090			—			—			745,090			86,755			831,845
Changes in value of available-for-sale financial assets	4,7		—		—		—			1,691						1,691			5,394			7,085
Remeasurements of the net defined benefit liability	18		—		—		8,531			—			—			8,531			(4,318	)		4,213
Valuation loss on cash flow hedge	4,7		—		—		—			(11,075	)		—			(11,075	)		—			(11,075	)
Shares of other comprehensive losses of joint ventures and associates			—		—		—			(571	)		—			(571	)		(31	)		(602	)
Shares of gain on remeasurements of joint ventures and associates			—		—		94			—			—			94			22			116
Exchange differences on translation of foreign operations			—		—		—			(5,347	)		—			(5,347	)		(60	)		(5,407	)
Total comprehensive income for the year			—		—		753,715			(15,302	)		—			738,413			87,762			826,175
Transactions with equity holders
Dividends paid by the Controlling Company			—		—		(122,425	)		—			—			(122,425	)		—			(122,425	)
Dividends paid to non-controlling interest of subsidiaries			—		—		—			—			—			—			(61,674	)		(61,674	)
Changes in consolidation scope			—		—		—			—			11,369			11,369			(15,550	)		(4,181	)
Change in ownership interest in subsidiaries			—		—		(50	)		—			50			—			—			—
Appropriation of loss on disposal of treasury stock			—		—		—			—			—			—			21,769			21,769
Others			—		—		—			—			3,510			3,510			141			3,651
Subtotal			—		—		(122,475	)		—			14,929			(107,546	)		(55,314	)		(162,860	)
Balance as at December 31, 2016		￦	1,564,499	￦	1,440,258	￦	9,778,707		￦	(1,432	)	￦	(1,217,934	)	￦	11,564,098		￦	1,352,844		￦	12,916,942

The above consolidated statements of changes of equity should be read in conjunction with the accompanying notes.

F-8

KT Corporation and Subsidiaries

Consolidated Statements of Changes in Equity (Continued)

Years ended December 31, 2016, 2017 and 2018

			Attributable to owners of the Controlling Company
(In millions of Korean won)	Notes		Share capital		Share premium		Retained earnings			Accumulated other comprehensive income			Other components of equity			Total			Non-controlling interest			Total equity
Balance as at January 1, 2017			￦	1,564,499	￦	1,440,258	￦	9,778,707		￦	(1,432	)	￦	(1,217,934	)	￦	11,564,098		￦	1,352,844		￦	12,916,942
Comprehensive income
Profit for the year				—		—		461,559			—			—			461,559			84,782			546,341
Changes in value of available-for-sale financial assets		4,7		—		—		—			(1,433	)					(1,433	)		(2,782	)		(4,215	)
Remeasurements of the net defined benefit liability		18		—		—		(80,711	)		—			—			(80,711	)		(3,251	)		(83,962	)
Valuation gains on cashflow hedge		4,7		—		—		—			30,846			—			30,846			—			30,846
Shares of other comprehensive income of associates and joint ventures				—		—		—			10,148			—			10,148			132			10,280
Shares of loss on remeasurements of associates and joint ventures				—		—		(116	)		—			—			(116	)		1			(115	)
Exchange differences on translation of foreign operations				—		—		—			(7,144	)		—			(7,144	)		(13,978	)		(21,122	)
Total comprehensive income for the year				—		—		380,732			32,417			—			413,149			64,904			478,053
Transactions with equity holders
Dividends paid by the Controlling Company				—		—		(195,977	)		—			—			(195,977	)		—			(195,977	)
Dividends paid to non-controlling interest of subsidiaries				—		—		—			—			—			—			(47,162	)		(47,162	)
Changes in consolidation scope				—		—		—			—			—			—			250			250
Change in ownership interest in subsidiaries				—		—		—			—			5,441			5,441			21,242			26,683
Appropriations of loss on disposal of treasury stock				—		—		(2,312	)		—			2,312			—			—			—
Others				—		—		—			—			4,879			4,879			(314	)		4,565
Subtotal				—		—		(198,289	)		—			12,632			(185,657	)		(25,984	)		(211,641	)
Balance at December 31, 2017			￦	1,564,499	￦	1,440,258	￦	9,961,150		￦	30,985		￦	(1,205,302	)	￦	11,791,590		￦	1,391,764		￦	13,183,354

The above consolidated statements of changes in equity should be read in conjunction with the accompanying notes.

F-9

KT Corporation and Subsidiaries

Consolidated Statements of Changes in Equity (Continued)

Years ended December 31, 2016, 2017 and 2018

			Attributable to owners of the Controlling Company
(In millions of Korean won)	Notes		Share capital		Share premium		Retained earnings			Accumulated other comprehensive income			Other components of equity			Total			Non-controlling interest			Total equity
Balance as at January 1, 2018			￦	1,564,499	￦	1,440,258	￦	9,961,150		￦	30,985		￦	(1,205,302	)	￦	11,791,590		￦	1,391,764		￦	13,183,354
Changes in accounting policy		41		—		—		954,053			17,741			—			971,794			77,128			1,048,922
Adjusted total equity at the beginning of the financial year				1,564,499		1,440,258		10,915,203			48,726			(1,205,302	)		12,763,384			1,468,892			14,232,276
Comprehensive income
Profit for the year				—		—		645,571			—			—			645,571			73,841			719,412
Remeasurements of net defined benefit liability		18		—		—		(61,449	)		—						(61,449	)		(12,062	)		(73,511	)
Share of loss on remeasurements of joint ventures and associates				—		—		(816	)		—			—			(816	)		—			(816	)
Share of other comprehensive income of associates and joint ventures				—		—		—			(136	)		—			(136	)		95			(41	)
Valuation loss on cash flow hedge		4,7		—		—		—			(27,011	)		—			(27,011	)		—			(27,011	)
Gain(loss) on disposal of equity instruments at fair value through other comprehensive income		4,7						4,441			(4,441	)		—			—			—			—
Gain on valuation of financial instruments at fair value through other comprehensive income		4,7		—		—		—			30,731			—			30,731			13,080			43,811
Exchange differences on translation of foreign operations				—		—		—			2,289			—			2,289			651			2,940
Total comprehensive income for the year				—		—		587,747			1,432			—			589,179			75,605			664,784
Transactions with owners
Dividends paid by the Controlling Company				—		—		(245,097	)		—			—			(245,097	)		—			(245,097	)
Dividends paid to non-controlling interest of subsidiaries				—		—		—			—			—			—			(53,535	)		(53,535	)
Changes in consolidation scope				—		—		—			—			(1,803	)		(1,803	)		102			(1,701	)
Change in ownership interest in subsidiaries				—		—		—			—			11,118			11,118			37,471			48,589
Appropriations of loss on disposal of treasury stock				—		—		(2,046	)		—			2,046			—			—			—
Disposal of treasury stock				—		—		—			—			9,547			9,547			—			9,547
Others				—		—		262			—			3,311			3,573			54			3,627
Subtotal				—		—		(246,881	)		—			24,219			(222,662	)		(15,908	)		(238,570	)
Balance as at December 31, 2018			￦	1,564,499	￦	1,440,258	￦	11,256,069		￦	50,158		￦	(1,181,083	)	￦	13,129,901		￦	1,528,589		￦	14,658,490

The above consolidated statements of changes in equity should be read in conjunction with the accompanying notes.

F-10

KT Corporation and Subsidiaries

Consolidated Statements of Cash Flows

Years ended December 31, 2016, 2017 and 2018

(In millions of Korean won)
	Notes		2016			2017			2018
Cash flows from operating activities
Cash generated from operations		32	￦	5,202,520		￦	4,318,884		￦	4,212,222
Interest paid				(372,525	)		(252,405	)		(304,428	)
Interest received				104,679			93,769			242,951
Dividends received				10,824			10,843			14,074
Income tax paid				(174,748	)		(293,342	)		(154,355	)
Net cash inflow from operating activities				4,770,750			3,877,749			4,010,464
Cash flows from investing activities
Collection of loans				47,887			55,190			64,023
Loans granted				(57,400	)		(59,800	)		(60,229	)
Disposal of financial assets at fair value through profit or loss				—			—			397,224
Disposal of financial assets at amortized cost				—			—			255,290
Disposal of financial assets at fair value through other comprehensive income				—			—			2,474
Disposal of assets held-for-sale				—			—			9,842
Disposal of available-for-sale financial assets				35,791			146,429			—
Acquisition of available-for-sale financial assets				(44,302	)		(89,027	)		—
Disposal of investments in associates and joint ventures				11,074			59,818			7,832
Acquisition of investments in associates and joint ventures				(38,675	)		(41,780	)		(34,420	)
Disposal of current and non-current financial instruments				293,283			645,686			—
Acquisition of current and non-current financial instruments				(597,345	)		(1,231,917	)		—
Disposal of property and equipment, and investment properties				93,401			68,229			90,992
Acquisition of property and equipment, and investment properties				(2,764,346	)		(2,442,223	)		(2,260,879	)
Acquisition of financial assets at fair value through profit or loss				—			—			(158,787	)
Acquisition of financial assets at amortized cost				—			—			(248,789	)
Acquisition of financial assets at fair value through other comprehensive income				—			—			(16,239	)
Disposal of intangible assets				17,891			22,680			20,037
Acquisition of intangible assets				(455,763	)		(613,556	)		(746,213	)
Decrease in cash due to business combination, etc.				(26,454	)		(2,974	)		(26,288	)
				(3,484,958	)		(3,483,245	)		(2,704,130	)
Cash flows from financing activities
Proceeds from borrowings and debentures				1,122,898			616,257			1,473,016
Repayments of borrowings and debentures				(1,768,768	)		(1,780,174	)		(1,612,731	)
Settlement of derivative assets and liabilities, net				(33,199	)		71,370			(3,461	)
Cash inflow from consolidated capital transactions				800			27,261			—
Cash outflow from consolidated capital transactions				(5,140	)		(300	)		(5,506	)
Cash inflow from other financing activities				—			16,962			13,939
Dividends paid to shareholders				(184,099	)		(243,140	)		(298,632	)
Acquisition of treasury stock				—			—			(24,415	)
Decrease in finance leases liabilities				(75,763	)		(71,735	)		(73,885	)
Net cash outflow from financing activities				(943,271	)		(1,363,499	)		(531,675	)
Effect of exchange rate change on cash and cash equivalents				(1,674	)		(3,134	)		581
Net increase (decrease) in cash and cash equivalents				340,847			(972,129	)		775,240
Cash and cash equivalents
Beginning of the year				2,559,464			2,900,311			1,928,182
End of the year			￦	2,900,311		￦	1,928,182		￦	2,703,422

The above consolidated statements of cash flows should be read in conjunction with the accompanying notes.

F-11

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1. General Information

The consolidated financial statements include the accounts of KT Corporation, which is the controlling company as defined under IFRS 10, Consolidated Financial Statements, and its 63 controlled subsidiaries as described in Note 1.2 (collectively referred to as the “Group”).

1.1 The Controlling Company

KT Corporation (the “Controlling Company”) commenced operations on January 1, 1982, when it spun off from the Korea Communications Commission (formerly the Korean Ministry of Information and Communications) to provide telephone services and to engage in the development of advanced communications services under the Act of Telecommunications of Korea. The headquarters are located in Seongnam City, Gyeonggi Province, Republic of Korea, and the address of its registered head office is 90, Buljeong-ro, Bundang-gu, Seongnam City, Gyeonggi Province.

On October 1, 1997, upon the announcement of the Government-Investment Enterprises Management Basic Act and the Privatization Law, the Controlling Company became a government-funded institution under the Commercial Code of Korea.

On December 23, 1998, the Controlling Company’s shares were listed on the Korea Exchange.

On May 29, 1999, the Controlling Company issued 24,282,195 additional shares and issued American Depository Shares (ADS), representing new shares and 20,813,311 government-owned shares, at the New York Stock Exchange. On July 2, 2001, the additional ADS representing 55,502,161 government-owned shares were issued at the New York Stock Exchange.

In 2002, the Controlling Company acquired the entire government-owned shares in accordance with the Korean government’s privatization plan. As at the end of the reporting period, the Korean government does not own any share in the Controlling Company.

1.2 Consolidated Subsidiaries

The consolidated subsidiaries as at December 31, 2017 and 2018, are as follows:

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
KT Powertel Co., Ltd.2	Trunk radio system business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	91.4%	92.4%	December
KT Submarine Co., Ltd.2, 4	Submarine cable construction and maintenance	Korea	39.3%	39.3%	December
KT Telecop Co., Ltd.	Security service	Korea	86.8%	86.8%	December
KT Hitel Co., Ltd.	Data communication	Korea	67.1%	67.1%	December
KT Service Bukbu Co., Ltd.	Opening services of fixed line	Korea	67.3%	67.3%	December
KT Service Nambu Co., Ltd.	Opening services of fixed line	Korea	77.3%	77.3%	December
KT Commerce Inc.	B2C, B2B service	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.1	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.2	Investment fund	Korea	100.0%	100.0%	December

F-12

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
KT Strategic Investment Fund No.3	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.4	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	—	100.0%	December
BC Card Co., Ltd.	Credit card business	Korea	69.5%	69.5%	December
VP Inc.	Payment security service for credit card, others	Korea	50.9%	50.9%	December
H&C Network	Call centre for financial sectors	Korea	100.0%	100.0%	December
BC Card China Co., Ltd.	Software development and data processing	China	100.0%	100.0%	December
INITECH Co., Ltd.4	Internet banking ASP and security solutions	Korea	58.2%	58.2%	December
Smartro Co., Ltd.	VAN (Value Added Network) business	Korea	81.1%	81.1%	December
KTDS Co., Ltd.4	System integration and maintenance	Korea	95.5%	95.5%	December
KT M Hows Co., Ltd.	Mobile marketing	Korea	90.0%	90.0%	December
KT M&S Co., Ltd.	PCS distribution	Korea	100.0%	100.0%	December
GENIE Music Corporation(KT Music Corporation)2	Online music production and distribution	Korea	42.5%	36.0%	December
KT MOS Bukbu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	100.0%	December
KT MOS Nambu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	98.4%	December
KT Skylife Co., Ltd.4	Satellite broadcasting business	Korea	50.3%	50.3%	December
Skylife TV Co., Ltd.	TV contents provider	Korea	92.6%	92.6%	December
KT Estate Inc.	Residential building development and supply	Korea	100.0%	100.0%	December
KT AMC Co., Ltd.	Asset management and consulting services	Korea	100.0%	100.0%	December
NEXR Co., Ltd.	Cloud system implementation	Korea	100.0%	100.0%	December
KTSB Data service	Data centre development and related service	Korea	51.0%	51.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3	Online advertisement	Korea	42.8%	42.8%	December
KT Sports Co., Ltd	Management of sports group	Korea	100.0%	100.0%	December
KT Music Contents Fund No.1	Music contents investment business	Korea	80.0%	80.0%	December
KT Music Contents Fund No.2	Music contents investment business	Korea	100.0%	100.0%	December
KT-Michigan Global Content Fund	Content investment business	Korea	88.6%	88.6%	December

F-13

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
Autopion Co., Ltd.	Service for information and communication	Korea	100.0%	100.0%	December
KTCS Corporation2,4	Database and online information provider	Korea	30.9%	30.9%	December
KTIS Corporation2,4	Database and online information provider	Korea	30.1%	30.1%	December
KT M mobile	Special category telecommunications operator and sales of communication device	Korea	100.0%	100.0%	December
KT Investment Co., Ltd.	Technology business finance	Korea	100.0%	100.0%	December
Whowho&Company Co., Ltd.	Software development and supply	Korea	100.0%	100.0%	December
PlayD Co., Ltd. (N Search Marketing Co., Ltd.)	Advertising agency business	Korea	100.0%	100.0%	December
Next connect PFV	Residential building development and supply	Korea	—	100.0%	December
KT Rwanda Networks Ltd.	Network installation and management	Rwanda	51.0%	51.0%	December
AOS Ltd.	System integration and maintenance	Rwanda	51.0%	51.0%	December
KT Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
KT ORS Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.zo.o.	Electronic communication business	Poland	94.3%	96.2%	December
Korea Telecom China Co., Ltd.	Foreign telecommunication business	China	100.0%	100.0%	December
KT Dutch B.V.	Super iMax and East Telecom management	Netherlands	100.0%	100.0%	December
Super iMax LLC	Wireless high speed internet business	Uzbekistan	100.0%	100.0%	December
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.0%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. KT Indonesia	Foreign telecommunication business	Indonesia	99.0%	99.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hongkong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
KT Hong Kong Limited	Foreign investment business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December

F-14

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
Texnoprosistem LLP	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Company Limited	Internet advertising solution	Thailand	—	99.9%	December

1 Sum of the ownership interests owned by the Controlling Company and subsidiaries.

2 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company can exercise the majority voting rights in its decision-making process at all times considering the historical voting pattern at the shareholders’ meetings.

3 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company holds the majority of voting right based on an agreement with other investors.

4 The number of subsidiaries’ treasury stock is deducted from the total number of shares when calculating the controlling percentage ownership.

Changes in scope of consolidation in 2018 are as follows:

Changes	Location	Subsidiary	Reason
Included	Korea	BC-VP Strategic Investment Fund No.1	Newly established
	Korea	KT MOS Bukbu Co., Ltd.	Acquisition
	Korea	KT MOS Nambu Co., Ltd.	Acquisition
	Korea	Next connect PFV	Newly established
	Thailand	Nasmedia Thailand Company Limited	Newly established
Excluded	Korea	KT New Business Fund No.1	Liquidated

F-15

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2016, 2017 and 2018, follows:

(In millions of Korean won)	2016
	Total assets		Total liabilities		Operating revenues		Profit (loss) For the year
KT Powertel Co., Ltd.	￦	113,725	￦	19,899	￦	81,390	￦	202
KT Linkus Co., Ltd.		64,318		56,953		117,587		(3,830	)
KT Submarine Co., Ltd.		156,993		55,573		84,137		5,146
KT Telecop Co., Ltd.		265,553		132,344		315,948		143
KT Hitel Co., Ltd.		249,202		46,941		198,994		4,298
KT Service Bukbu Co., Ltd.		32,863		24,580		182,952		694
KT Service Nambu Co., Ltd.		32,621		24,282		218,602		772
BC Card Co., Ltd.1		3,651,065		2,602,404		3,567,512		163,131
H&C Network1		272,110		80,983		266,613		14,749
Nasmedia Co., Ltd.1		263,925		159,502		70,037		11,972
KTDS Co., Ltd.1		197,970		151,644		476,379		10,838
KT M Hows Co., Ltd.		28,539		18,466		19,922		2,865
KT M&S Co., Ltd.		247,854		227,507		724,144		(12,955	)
GENIE Music Corporation(KT Music Corporation)		110,080		41,953		111,450		8,235
KT Skylife Co., Ltd.1		777,948		231,452		668,945		68,863
KT Estate Inc.1		1,734,729		375,341		405,417		46,815
KTSB Data service		20,075		759		5,136		(1,983	)
KT Innoedu Co., Ltd.		6,477		7,259		15,599		103
KT Sat Co., Ltd.		744,653		253,041		144,594		36,266
KT Sports		16,925		13,573		48,476		(198	)
KT Music Contents Fund No.1		10,592		331		349		103
KT-Michigan Global Content Fund		16,250		163		133		(514	)
Autopion Co., Ltd.		6,163		2,794		7,772		(409	)
KT M mobile		131,446		20,369		112,532		(40,041	)
KT Investment Co., Ltd.1		39,506		23,123		10,130		(1,832	)
NgeneBio		6,361		4,733		244		(1,833	)
KTCS Corporation1		322,768		166,642		955,050		7,892
KTIS Corporation		221,176		63,871		436,914		9,991
Korea Telecom Japan Co., Ltd.		3,592		5,374		5,122		(1,391	)
Korea Telecom China Co., Ltd.		532		188		930		60
KT Dutch B.V.		34,197		73		166		85
Super iMax LLC		10,308		6,734		10,759		(1,802	)
East Telecom LLC		31,885		16,554		27,492		3,257
Korea Telecom America, Inc.		4,464		1,306		7,113		181
PT. KT Indonesia		16		—		—		(7	)
KT Rwanda Networks Ltd.		167,112		138,651		13,435		(31,455	)
KT Belgium		79,391		7		—		(67	)
KT ORS Belgium		2,013		23		—		(46	)
KBTO sp.zo.o.		1,166		2,378		21		(2,587	)
AOS Ltd.		10,025		3,179		14,481		(1,123	)
KT Hongkong Telecommunications Co., Ltd.		1,571		956		1,568		120

F-16

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2017
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	115,125	￦	18,937	￦	69,234	￦	2,112
KT Linkus Co., Ltd.		59,344		51,516		112,043		725
KT Submarine Co., Ltd.		142,797		34,056		73,985		8,243
KT Telecop Co., Ltd.		264,353		131,633		317,591		2,885
KT Hitel Co., Ltd.		258,240		52,943		227,884		3,225
KT Service Bukbu Co., Ltd.		29,281		22,096		194,837		688
KT Service Nambu Co., Ltd.		36,076		26,412		232,996		875
BC Card Co., Ltd.1		4,048,263		2,955,038		3,628,995		156,109
H&C Network1		273,856		65,446		277,622		16,104
Nasmedia Co., Ltd.1		315,967		188,197		120,667		26,676
KTDS Co., Ltd.1		144,922		93,343		459,266		11,584
KT M Hows Co., Ltd.		42,738		28,489		24,610		4,097
KT M&S Co., Ltd.		242,388		231,151		734,420		(9,707	)
GENIE Music Corporation (KT Music Corporation)		139,686		48,512		156,163		(3,401	)
KT Skylife Co., Ltd.1		792,893		210,550		687,752		57,314
KT Estate Inc.1		1,869,194		502,915		428,446		52,416
KTSB Data service		18,306		605		4,950		(1,651	)
KT Sat Co., Ltd.		742,391		220,804		147,649		29,601
KT Sports		11,131		7,805		53,357		(199	)
KT Music Contents Fund No.1		13,804		1,041		370		(499	)
KT Music Contents Fund No.2		7,500		11		—		(11	)
KT-Michigan Global Content Fund		14,575		147		159		(426	)
Autopion Co., Ltd.		6,306		3,530		6,679		(618	)
KT M mobile		93,601		21,453		159,684		(38,883	)
KT Investment Co., Ltd.1		54,673		38,313		8,794		(619	)
KTCS Corporation1		348,334		188,764		968,186		7,385
KTIS Corporation		223,818		62,569		438,597		8,337
Korea Telecom Japan Co., Ltd.1		1,554		2,788		2,772		536
Korea Telecom China Co., Ltd.		665		32		1,030		348
KT Dutch B.V.		30,312		50		206		169
Super iMax LLC		3,449		4,886		7,314		(4,584	)
East Telecom LLC1		11,672		11,748		19,663		(9,118	)
Korea Telecom America, Inc.		3,694		791		6,783		109
PT. KT Indonesia		8		—		—		(6	)
KT Rwanda Networks Ltd.2		151,359		139,561		15,931		(22,762	)
KT Belgium		86,455		8		49		(2	)
KT ORS Belgium		1,769		14		10		(10	)
KBTO sp.zo.o.		3,311		2,268		67		(3,456	)
AOS Ltd.2		9,437		4,519		8,952		(682	)
KT Hongkong Telecommunications Co., Ltd.		2,578		1,497		7,304		494

F-17

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2018
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	124,064	￦	28,217	￦	65,620	￦	(5,545	)
KT Linkus Co., Ltd.		54,147		44,895		106,337		1,216
KT Submarine Co., Ltd.		130,715		27,530		61,652		(4,286	)
KT Telecop Co., Ltd.		272,492		140,314		328,262		166
KT Hitel Co., Ltd.		272,708		66,043		279,117		657
KT Service Bukbu Co., Ltd.		30,599		23,964		195,961		(31	)
KT Service Nambu Co., Ltd.		37,452		27,939		230,088		160
BC Card Co., Ltd.1		3,722,379		2,630,536		3,551,715		70,889
H&C Network1		245,841		63,188		297,470		(15,944	)
Nasmedia Co., Ltd.1		303,112		161,164		106,805		20,596
KTDS Co., Ltd.1		148,675		95,834		434,302		8,586
KT M Hows Co., Ltd.		60,197		42,386		26,673		3,691
KT M&S Co., Ltd.		228,073		207,740		791,652		11,408
GENIE Music Corporation (KT Music Corporation)		221,559		75,827		171,314		6,374
KT MOS Bukbu Co., Ltd.		14,121		10,571		16,543		(782	)
KT MOS Nambu Co., Ltd.		14,313		8,927		14,941		(2,418	)
KT Skylife Co., Ltd.1		816,001		149,841		694,059		52,010
KT Estate Inc.1		1,695,995		304,712		569,269		51,854
KTSB Data service		8,632		523		4,627		(9,576	)
KT Sat Co., Ltd.		685,926		173,513		137,186		4,921
KT Sports Co., Ltd.		9,560		6,376		55,565		(154	)
KT Music Contents Fund No.1		14,092		1,035		559		294
KT Music Contents Fund No.2		7,629		281		150		(142	)
KT-Michigan Global Content Fund		12,741		—		869		(670	)
Autopion Co., Ltd.		8,838		5,801		12,035		453
KT M mobile		146,334		35,335		172,674		(10,085	)
KT Investment Co., Ltd.1		74,580		58,040		8,095		247
KTCS Corporation1		350,280		188,561		1,019,787		11,401
KTIS Corporation		229,246		68,997		451,532		7,900
Next connect PFV		385,769		34,370		143		(12,449	)
Korea Telecom Japan Co., Ltd.1		1,326		2,910		1,965		(126	)
Korea Telecom China Co., Ltd.		661		22		681		10
KT Dutch B.V.		31,693		41		191		105
Super iMax LLC		4,150		4,528		4,845		(424	)
East Telecom LLC1		16,590		14,263		15,087		2,639
Korea Telecom America, Inc.		4,218		832		7,554		350
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		144,129		162,801		15,150		(29,238	)
KT Belgium		90,172		1		29		(43	)
KT ORS Belgium		6,709		5		—		(46	)
KBTO sp.zo.o.		1,364		217		202		(3,771	)
AOS Ltd.2		14,018		4,952		6,300		(680	)
KT Hongkong Telecommunications Co., Ltd.		3,616		2,143		9,990		351

F-18

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements.

2 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities.

2. Significant Accounting Policies

The principal accounting policies applied in the preparation of these consolidated financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated.

2.1 Basis of Preparation

The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. It also requires management to exercise judgment in the process of applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 3.

Correction (“revision”) of prior financial statements

During the year 2018, the Group identified errors related to prior years in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system. Pursuant to the guidance of Staff Accounting Bulletin (“SAB”) No. 99, “Materiality”, the Group evaluated the materiality of the misstatement quantitatively and qualitatively and has concluded that the amounts of misstatement were not material to its annual prior periods financial statements or trends of financial results. However, because of the significance of the cumulative out-of-period adjustment to the 2018 fiscal year, the financial statements for years prior to 2018 fiscal year have been revised in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements”. See Note 43 for further details on the impact of the revision.

2.2 Changes in Accounting Policy and Disclosures

(1) New and amended standards adopted by the Group

The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2018, and the application has following impacts on the consolidated financial statements.

- Amendments to IAS 28 Investments in Associates and Joint Ventures

When an investment in an associate or a joint venture is held by, or is held indirectly through, an entity that is a venture capital organization, or a mutual fund, unit trust and similar entities

F-19

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

including investment-linked insurance funds, the entity may elect to measure each investment separately at fair value through profit or loss in accordance with IFRS 9. The amendment does not have a significant impact on the financial statements because the Group is not a venture capital organization.

- Amendments to IAS 40 Transfers of Investment Property

The amendment to IAS 40 clarifies that a transfer to, or from, investment property, including property under construction, can only be made if there has been a change in use that is supported by evidence, and the list of evidence for a change of use in the standard was re-characterized as a non-exclusive list of example. The amendment does not have a significant impact on the financial statements.

- Amendments to IFRS 2 Share-based Payment

Amendments to IFRS 2 clarify accounting for a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. Amendments also clarify that the measurement approach should treat the terms and conditions of a cash-settled award in the same way as for an equity-settled award. The amendment does not have a significant impact on the financial statements.

- Enactment of IFRIC 22 Foreign Currency Transaction and Advance Consideration

According to the enactment, the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income (or part of it) is the date on which an entity initially recognizes the non-monetary asset or non-monetary liability arising from the payment or receipt of advance consideration. The enactment does not have a significant impact on the financial statements.

- IFRS 9 Financial Instruments

The Group has applied IFRS 9 Financial Instruments on January 1, 2018, the date of initial application. In accordance with the transitional provisions in IFRS 9, comparative figures have not been restated, and the differences between previous book amounts and book amounts at the date of initial application are recognized to retained earnings. See Note 41 for further details on the impact of the application of the standard.

- IFRS 15 Revenue from Contracts with Customers

The Group has applied IFRS 15 Revenue from Contracts with Customers. In accordance with the transition provisions in IFRS 15, comparative figures have not been restated. The Group elected the modified retrospective approach, and recognized the cumulative impact of initially applying the revenue standard as an adjustment to retained earnings as at January 1, 2018, the period of initial application. See Note 41 for further details on the impact of the application of the standard.

F-20

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(2) New standards and interpretations not yet adopted by the Group

Certain new accounting standards and interpretations that have been published that are not mandatory for annual reporting period commencing January 1, 2018 and have not been early adopted by the Group are set out below.

- Amendments to IFRS 16 Leases

IFRS 16 Leases issued on May 22, 2017 is effective for annual periods beginning on or after January 1, 2019, with early adoption permitted. This standard will replace IAS 17 Leases. The Group will apply the standards for annual periods beginning on or after January 1, 2019.

Under the new standard, with implementation of a single lease model, lessee is required to recognize assets and liabilities for all lease which lease term is over 12 months and underlying assets are not low value assets. A lessee is required to recognize a right-of-use asset and a lease liability representing its obligation to make lease payments.

The Group performed an impact assessment to identify potential financial effects of applying IFRS 16. The Group is analyzing the effects on the financial statements based on available information as at December 31, 2018 to identify effects on 2019 financial statements.

The Group will adopt IFRS 16 Leases effective January 1, 2019 using a modified retrospective method and will not restate comparative periods. The Group will carry forward the assessment of whether our contracts contain or are leases, classification of our leases and remaining lease terms. Based on the Group’s portfolio of leases as at December 31, 2018, approximately KRW 616,759 million of lease assets and liabilities will be recognized on the consolidated statement of financial position upon adoption. In the statement of cash flows, the repayment portion of the lease payments from existing operating leases will reduce net cash from/used in financing activities and no longer affect net cash from operating activities. Only the interest payments will remain in net cash from operating activities, the total of which will rise.

- Amendments to IFRS 9 Financial Instruments

The narrow-scope amendments made to IFRS 9 Financial Instruments enable entities to measure certain prepayable financial assets with negative compensation at amortized cost. When a modification of a financial liability measured at amortized cost that does not result in the derecognition, a modification gain or loss shall be recognized in profit or loss. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted.

- Amendments to IAS 19 Employee Benefits

The amendments require that an entity shall calculate current service cost and net interest for the remainder of the reporting period after a plan amendment, curtailment or settlement based on updated actuarial assumptions from the date of the change. The amendments also require that a reduction in a surplus must be recognized in profit or loss even if that surplus was not previously recognized because of the impact of the asset ceiling. The amendments are effective for plan amendments, curtailments and settlements occurring in reporting periods that begin on or after January 1, 2019.

F-21

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

- Amendments to IAS 28 Investments in Associates and Joint Ventures

The amendments clarify that an entity shall apply IFRS 9 to financial instruments in an associate or joint venture to which the equity method is not applied. These include long-term interests that, in substance, form part of the entity’s net investment in an associate or joint venture. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted. In accordance with the transitional provisions in IFRS 9, the restatement of the comparative information is not required and the cumulative effects of initially applying the amendments retrospectively should be recognized in the beginning balance of retained earnings (or other components of equity, as appropriate) at the date of initial application.

- Enactment to IFRIC 23 Uncertainty over Income Tax Treatments

The Interpretation explains how to recognize and measure deferred and current income tax assets and liabilities where there is uncertainty over a tax treatment, and includes guidance on how to determine whether each uncertain tax treatment is considered separately or together. It also presents examples of circumstances where a judgement or estimate is required to be reassessed. This Interpretation will be applied for annual periods beginning on or after January 1, 2019, and an entity can either restate the comparative financial statements retrospectively or recognize the cumulative effect of initially applying the Interpretation as an adjustment in the beginning balance at the date of initial application.

- Annual Improvements to IFRS 2015 – 2017 Cycle:

• IFRS 3 Business Combination

The amendments clarify that when a party to a joint arrangement obtains control of a business that is a joint operation, and had rights to the assets and obligations for the liabilities relating to that joint operation immediately before the acquisition date, the transaction is a business combination achieved in stages. In such cases, the acquirer shall remeasure its entire previously held interest in the joint operation. These amendments will be applied to business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• IFRS 11 Joint Agreements

The amendments clarify that when a party that participates in, but does not have joint control of, a joint operation might obtain joint control of the joint operation in which the activity of the joint operation constitutes a business. In such cases, previously held interests in the joint operation are not remeasured. These amendments will be applied to transactions in which an entity obtains joint control on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• Paragraph 57A of IAS 12 Income Tax

The amendment is applied to all the income tax consequences of dividends and requires an entity to recognize the income tax consequences of dividends in profit or loss, other comprehensive income or equity according to where the entity originally recognized those past transactions or events. These amendments will be applied for annual reporting periods beginning on or after January 1, 2019, with early adoption permitted.

F-22

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

• IAS 23 Borrowing Costs

The amendments clarify that if a specific borrowing remains outstanding after the related qualifying asset is ready for its intended use (or sale), it becomes part of general borrowings. These amendments will be applied to borrowing costs incurred on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

2.3 Consolidation

The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements.

(1) Subsidiaries

Subsidiaries are all entities (including special purpose entities (“SPEs”)) over which the Group has control. The Group controls an entity when the Group is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power to direct the activities of the entity. Subsidiaries are fully consolidated from the date on which control is transferred to the Group. They are deconsolidated from the date that control ceases.

The acquisition method of accounting is used to account for business combinations by the Group. The consideration transferred is measured at the fair values of the assets transferred, and identifiable assets acquired and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. The Group recognizes any non-controlling interest in the acquired entity on an acquisition-by-acquisition basis either at fair value or at the non-controlling interest’s proportionate share of the acquired entity’s net identifiable assets. All other non-controlling interests are measured at fair values, unless otherwise required by other standards. Acquisition-related costs are expensed as incurred.

The excess of consideration transferred, amount of any non-controlling interest in the acquired entity and acquisition-date fair value of any previous equity interest in the acquired entity over the fair value of the net identifiable assets acquired is recoded as goodwill. If those amounts are less than the fair value of the net identifiable assets of the business acquired, the difference is recognized directly in the profit or loss as a bargain purchase.

Intercompany transactions, balances and unrealized gains on transactions between group companies are eliminated. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the transferred asset. Accounting policies of subsidiaries have been changed where necessary to ensure consistency with the policies adopted by the Group.

(2) Changes in ownership interests in subsidiaries without change of control

Any difference between the amount of the adjustment to non-controlling interest that do not result in a loss of control and any consideration paid or received is recognized in a separate reserve within equity attributable to owners of the Controlling Group.

F-23

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(3) Disposal of subsidiaries

When the Group ceases to consolidate for a subsidiary because of a loss of control, any retained interest in the subsidiary is remeasured to its fair value with the change in carrying amount recognized in profit or loss.

(4) Associates

Associates are all entities over which the Group has significant influence, and investments in associates are initially recognized at acquisition cost using the equity method. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If there is any objective evidence that the investment in the associate is impaired, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss.

(5) Joint arrangement

A joint arrangement, wherein two or more parties have joint control, is classified as either a joint operation or a joint venture. A joint operator recognizes its direct right to the assets, liabilities, revenues and expenses of joint operations and its share of any jointly held or incurred assets, liabilities, revenues and expenses. A joint venture has rights to the net assets relating to the joint venture and accounts for that investment using the equity method.

2.4 Segment Reporting

Information of each operating segment is reported in a manner consistent with the business segment reporting provided to the chief operating decision-maker (Note 34). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments.

2.5 Foreign Currency Translation

(1) Functional and presentation currency

Items included in the financial statements of each of the Group’s entities are measured using the currency of the primary economic environment in which each entity operates (the “functional currency”). The consolidated financial statements are presented in Korean won, which is the Parent Company’s functional and presentation currency.

(2) Transactions and balances

Foreign currency transactions are translated into the functional currency using the exchange rates at the dates of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation of monetary assets and liabilities denominated in foreign currencies at year end exchange rates are generally recognized in profit or loss. They are deferred in other comprehensive income if they relate to qualifying cash flow hedges and qualifying effective portion of net investment hedges, or are attributable to monetary part of the net investment in a foreign operation.

Foreign exchange gains and losses are presented in the statement of profit or loss, within finance costs.

F-24

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. Translation differences on assets and liabilities carried at fair value are reported as part of the fair value gain or loss. For example, translation differences on non-monetary assets and liabilities such as equities held at fair value through profit or loss are recognized in profit or loss as part of the fair value gain or loss and translation differences on non-monetary assets such as equities classified as equity instruments at fair value through other comprehensive income are recognized in other comprehensive income.

(3) Translation to the presentation currency

The results and financial position of foreign operations that have a functional currency different from the presentation currency are translated into the presentation currency as follows:

• assets and liabilities for each statement of financial position presented are translated at the closing rate at the end of the reporting period,

• income and expenses for each statement of profit or loss are translated at average exchange rates for the period,

• equity is translated at the historical exchange rate, and

• all resulting exchange differences are recognized in other comprehensive income.

2.6 Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, deposits held at call with banks, and other short-term highly liquid investments with original maturities of less than three months.

2.7 Financial Assets

(1) Classification

From January 1, 2018, the Group classifies its financial assets in the following measurement categories:

• those to be measured at fair value through profit or loss

• those to be measured at fair value through other comprehensive income, and

• those to be measured at amortized cost.

The classification depends on the Group’s business model for managing the financial assets and the contractual terms of the cash flows.

For financial assets measured at fair value, gains and losses will either be recorded in profit or loss or other comprehensive income. For investments in debt instruments, this will depend on the business model in which the investment is held. The Group reclassifies debt investments when, and only when its business model for managing those assets changes.

For investments in equity instruments that are not held for trading, this will depend on whether the Group has made an irrevocable election at the time of initial recognition to account for the equity investment at fair value through other comprehensive income. Changes in fair value of the investments in equity instruments that are not accounted for as other comprehensive income are recognized in profit or loss.

F-25

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(2) Measurement

At initial recognition, the Group measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition of the financial asset. Transaction costs of financial assets carried at fair value through profit or loss are expensed in profit or loss.

Hybrid (combined) contracts with embedded derivatives are considered in their entirety when determining whether their cash flows are solely payment of principal and interest.

A. Debt instruments

Subsequent measurement of debt instruments depends on the Group’s business model for managing the asset and the cash flow characteristics of the asset. The Group classifies its debt instruments into one of the following three measurement categories:

• Amortized cost: Assets that are held for collection of contractual cash flows where those cash flows represent solely payments of principal and interest are measured at amortized cost. A gain or loss on a debt investment that is subsequently measured at amortized cost and is not part of a hedging relationship is recognized in profit or loss when the asset is derecognized or impaired. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method.

• Fair value through other comprehensive income: Assets that are held for collection of contractual cash flows and for selling the financial assets, where the assets’ cash flows represent solely payments of principal and interest, are measured at fair value through other comprehensive income. Movements in the carrying amount are taken through other comprehensive income, except for the recognition of impairment loss (and reversal of impairment loss), interest income and foreign exchange gains and losses which are recognized in profit or loss. When the financial asset is derecognized, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. Foreign exchange gains and losses are presented in ‘finance income or finance costs’ and impairment loss in ‘finance costs or operating expenses’.

• Fair value through profit or loss: Assets that do not meet the criteria for amortized cost or fair value through other comprehensive income are measured at fair value through profit or loss. A gain or loss on a debt investment that is subsequently measured at fair value through profit or loss and is not part of a hedging relationship is recognized in profit or loss and presented net in the statement of profit or loss within ‘finance income or finance costs’ in the period in which it arises.

B. Equity instruments

The Group subsequently measures all equity investments at fair value. Where the Group’s management has elected to present fair value gains and losses on equity investments in other comprehensive income, there is no subsequent reclassification of fair value gains and losses to profit or loss following the derecognition of the investment. Dividends from such investments continue to be recognized in profit or loss as ‘finance income’ when the Group’s right to receive payments is established.

F-26

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Changes in the fair value of financial assets at fair value through profit or loss are recognized in ‘finance income or finance costs’ in the statement of profit or loss as applicable. Impairment loss (and reversal of impairment loss) on equity investments measured at fair value through other comprehensive income are not reported separately from other changes in fair value.

(3) Impairment

The Group assesses on a forward looking basis the expected credit losses associated with its debt instruments carried at amortized cost and fair value through other comprehensive income. The impairment methodology applied depends on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, the Group applies the simplified approach, which requires expected lifetime credit losses to be recognized from initial recognition of the receivables.

(4) Recognition and Derecognition

Regular way purchases and sales of financial assets are recognized or derecognized on trade-date, the date on which the Group commits to purchase or sell the asset. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and the Group has transferred substantially all the risks and rewards of ownership.

If a transfer does not result in derecognition because the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continues to recognize the transferred asset in its entirety and recognizes a financial liability for the consideration received.

(5) Offsetting of financial instruments

Financial assets and liabilities are offset and the net amount reported in the statements of financial position where there is a legally enforceable right to offset the recognized amounts and there is an intention to settle on a net basis or realize the assets and settle the liability simultaneously. The legally enforceable right must not be contingent on future events and must be enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group or the counterparty.

2.8 Derivative Instruments

Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured to their fair value at the end of each reporting period. The accounting for subsequent changes in fair value depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The Group has hedge relationships and designates certain derivatives as:

• hedges of a particular risk associated with the cash flows of recognized assets and liabilities and highly probable forecast transactions (cash flow hedges)

At inception of the hedge relationship, the Group documents the economic relationship between hedging instruments and hedged items including whether changes in the cash flows of the hedging instruments are expected to offset changes in the cash flows of hedged items.

F-27

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The fair values of derivative financial instruments designated in hedge relationships are disclosed in Note 37.

The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedged item is more than 12 months; it is classified as a current asset or liability when the remaining maturity of the hedged item is less than 12 months. A non-derivative financial asset and a non-derivative financial liability is classified as a current or non-current based on its expected maturity and its settlement, respectively.

The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in the cash flow hedge reserve within equity, and the ineffective portion is recognized in ‘finance income (costs)’.

Amounts of changes in fair value of effective hedging instruments accumulated in equity are recognized as ‘finance income (costs)’ for the periods when the corresponding transactions affect profit or loss.

When a hedging instrument expires, or is sold, terminated, exercised, or when a hedge no longer meets the criteria for hedge accounting, any accumulated cash flow hedge reserve at that time remains in equity until the forecast transaction occurs, resulting in the recognition of a non-financial asset such as inventory. When the forecast transaction is no longer expected to occur, the cash flow hedge reserve and deferred costs of hedging that were reported in equity are immediately reclassified to profit or loss.

2.9 Trade Receivables

Trade receivables are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less loss allowance. See Note 6 for further information about the Group’s accounting for trade receivables and Note 2.7 (3) for a description of the Group’s impairment policies.

2.10 Inventories

Inventories are stated at the lower of cost and net realizable value. Cost is determined using the moving average method, except for inventories in-transit which is determined using the specific identification method.

2.11 Non-current Assets (or Disposal Group) Held-for-sale

Non-current assets (or disposal group) are classified as held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continuing use and a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less costs to sell.

2.12 Property and Equipment

Property and equipment are stated at historical cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items.

F-28

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:

	Estimated Useful Life
Buildings	5 – 40 years
Structures	5 – 40 years
Machinery and equipment (Telecommunications equipment and others)	2 – 40 years
Others
Vehicles	4 – 6 years
Tools	4 – 6 years
Office equipment	2 – 6 years

The depreciation method, residual values and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates.

2.13 Investment Property

Investment property is a property held to earn rentals or for capital appreciation. An investment property is measured initially at its cost. After recognition as an asset, investment property is carried at cost less accumulated depreciation and impairment losses. Investment property, except for land, is depreciated using the straight-line method over their useful lives from 10 to 40 years.

2.14 Intangible Assets

(1) Goodwill

Goodwill is measured as explained in Note 2.3 (a) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Gains and losses on the disposal of subsidiaries and business include the carrying amount of goodwill relating to the subsidiaries and business sold.

For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the CGUs, or group of CGUs, that is expected to benefit from the synergies of the combination. Goodwill is monitored at the operating segment level.

Goodwill impairment reviews are undertaken annually or more frequently if events or changes in circumstances indicate a potential impairment. The carrying amount of goodwill is compared to the recoverable amount, which is the higher of value in use and the fair value less costs to sell. Any impairment is recognized immediately as an expense and is not subsequently reversed.

(2) Intangible assets except goodwill

Intangible assets, except for goodwill, are initially recognized at its historical cost, and carried at cost less accumulated amortization and accumulated impairment losses. Membership rights (condominium membership and golf membership) that have an indefinite useful life are not subject to amortization because there is no foreseeable limit to the period over which the assets are

F-29

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

expected to be utilized. The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:

	Estimated Useful Life
Development costs	5 – 6 years
Software	6 years
Industrial property rights	5 – 50 years
Frequency usage rights	5 – 10 years
Others1	2 – 50 years

¹  Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.

2.15 Borrowing Costs

General and specific borrowing costs that are directly attributable to the acquisition, construction or production of a qualifying asset are capitalized during the period of time that is required to complete and prepare the asset for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Other borrowing costs are expensed in the period in which they are incurred.

2.16 Government Grants

Grants from the government are recognized at their fair value where there is a reasonable assurance that the grant will be received and the Group will comply with all attached conditions. Government grants related to assets are presented in the statement of financial position by setting up the grant as deferred income that is recognized in profit or loss on a systematic basis over the useful life of the asset. Grants related to income are presented as a credit in the statement of profit or loss within ‘other income’.

2.17 Impairment of Non-Financial Assets

Goodwill and intangible assets that have an indefinite useful life are not subject to amortization and are tested annually for impairment, or more frequently if events or changes in circumstances indicate that they might be impaired. Other assets are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of an asset’s fair value less costs of disposal and value in use. Non-financial assets other than goodwill that suffered an impairment are reviewed for possible reversal of the impairment at the end of each reporting period.

2.18 Trade and other payables

These amounts represent liabilities for goods and services provided to the Group prior to the end of reporting period which are unpaid. Trade and other payables are presented as current liabilities, unless payment is not due within 12 months after the reporting period. They are recognized initially at their fair value and subsequently measured at amortized cost using the effective interest method.

F-30

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2.19 Financial Liabilities

(1) Classification and measurement

The Group’s financial liabilities at fair value through profit or loss are financial instruments held for trading. A financial liability is held for trading if it is incurred principally for the purpose of repurchasing in the near term. Derivatives that are not designated as hedging instruments or derivatives separated from financial instruments containing embedded derivatives are also categorized as held for trading.

The Group classifies non-derivative financial liabilities, except for financial liabilities at fair value through profit or loss, financial guarantee contracts and financial liabilities that arise when a transfer of financial assets does not qualify for derecognition, as financial liabilities carried at amortized cost and present as ‘trade payables’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position.

Preferred shares that require mandatory redemption at a particular date are classified as liabilities. Interest expenses on these preferred shares using the effective interest method are recognized in the statement of profit or loss as ‘finance costs’, together with interest expenses recognized from other financial liabilities.

(2) Derecognition

Financial liabilities are removed from the statement of financial position when it is extinguished; for example, when the obligation specified in the contract is discharged or cancelled or expired or when the terms of an existing financial liability are substantially modified. The difference between the carrying amount of a financial liability extinguished or transferred to another party and the consideration paid (including any non-cash assets transferred or liabilities assumed) is recognized in profit or loss.

2.20 Financial Guarantee Contracts

Financial guarantee contracts are recognized as a financial liability at the time the guarantee is issued. The liability is initially measured at fair value, subsequently at the higher of following and recognized in the statement of financial position within ‘other financial liabilities’.

• the amount determined in accordance with the expected credit loss model under IFRS 9 Financial Instruments and

• the amount initially recognized less, where appropriate, the cumulative amount of income recognized in accordance with IFRS 15 Revenue from Contracts with Customers

2.21 Employee Benefits

(1) Post-employment benefits

The Group operates both defined contribution and defined benefit pension plans.

A defined contribution plan is a pension plan under which the Group pays fixed contributions into a separate entity. The contributions are recognized as employee benefit expenses when an employee has rendered service.

F-31

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

A defined benefit plan is a pension plan that is not a defined contribution plan. Generally, post-employment benefits are payable after the completion of employment, and the benefit amount depended on the employee’s age, periods of service or salary levels. The liability recognized in the statement of financial position in respect of defined benefit pension plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of plan assets. The defined benefit obligation is calculated annually by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid, and that have terms approximating to the terms of the related obligation. Remeasurement gains and losses arising from experience adjustments and changes in actuarial assumptions are recognized in the period in which they occur, directly in other comprehensive income.

Changes in the present value of the defined benefit obligation resulting from plan amendments or curtailments are recognized immediately in profit or loss as past service costs.

(2) Termination benefits

Termination benefits are payable when employment is terminated by the Group before the normal retirement date, or whenever an employee accepts voluntary redundancy in exchange for these benefits. The Group recognizes termination benefits at the earlier of the following dates: when the entity can no longer withdraw the offer of those benefits or when the entity recognizes costs for a restructuring.

(3) Long-term employee benefits

Certain entities within the Group provide long-term employee benefits that are entitled to employees with service period for ten years and above. The expected costs of these benefits are accrued over the period of employment using the same accounting methodology as used for defined benefit pension plans. The Group recognizes service cost, net interest on other long-term employee benefits and remeasurements as profit or loss for the year. These liabilities are valued annually by an independent qualified actuary.

2.22 Share-based payments

Equity-settled share-based payment is recognized at fair value of equity instruments granted, and employee benefit expense is recognized over the vesting period. At the end of each period, the Group revises its estimates of the number of options that are expected to vest based on the non-market vesting and service conditions. It recognizes the impact of the revision to original estimates, if any, in profit or loss, with a corresponding adjustment to equity.

2.23 Provisions

Provisions for service warranties, make good obligation, and legal claims are recognized when the Group has a present legal or constructive obligation as a result of past events, it is probable that an outflow of resources will be required to settle the obligation and the amount can be reliably estimated. Provisions are measured at the present value of management’s best estimate of the expenditure required to settle the present obligation at the end of the reporting period, and the increase in the provision due to the passage of time is recognized as interest expense.

F-32

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2.24 Leases

(1) Lessee

A lease is an agreement, whereby the lessor conveys to the lessee, in return for a payment or series of payments, the right to use an asset for an agreed period of time. Leases where all the risks and rewards of ownership are not transferred to the Group are classified as operating leases. Lease payments under operating leases are recognized as expenses on a straight-line basis over the lease term.

Leases where the Group has substantially all the risks and rewards of ownership are classified as finance leases. Finance leases are capitalized as lease assets and liabilities at the lease’s inception at the fair value of the leased property or, if lower, the present value of the minimum lease payments.

(2) Lessor

A lease is classified as a finance lease if it transfers substantially all the risks and rewards incidental to ownership at the inception of the lease. A lease other than a finance lease is classified as an operating lease. Lease income from operating leases is recognized in income on a straight-line basis over the lease term. Initial direct costs incurred by the lessor in negotiating and arranging an operating lease is added to the carrying amount of the leased asset and recognized as an expense over the lease term on the same basis as the lease income.

2.25 Share Capital

The Group classifies ordinary shares as equity.

Where the Controlling Company purchases its own shares, the consideration paid, including any directly attributable incremental costs, is deducted from equity until the share are cancelled or reissued. When these treasury shares are reissued, any consideration received is including in equity attributable to the equity holders of the Controlling Company.

2.26 Revenue Recognition

In May 2014, the IASB issued IFRS 15, which replaced IAS 18. This standard is applicable to years beginning on or after January 1, 2018. The Group adopted IFRS 15 retrospectively, with the cumulative effects of the initial application being recognized on the date of the initial application, on January 1, 2018. Accordingly, as provided for in this standard, the Group recorded the cumulative effect as at the date of the initial application of the standard as an adjustment to the initial balance in the retained earnings. In accordance with this transition method, the entity applied this pronouncement retrospectively only for contracts that are still in force as at the date of the initial application.

(1) Identification of contracts

The Group performed a comprehensive review of the commercial offers in force, in order to identify the principal contractual clauses and other contractual elements that may be significant regarding the adoption of the new accounting standard.

F-33

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(2) Identifying performance obligations

With the application of IFRS 15, the Group identifies performance obligations with a customer such as mobile and fixed-line service, Media and content services, financial services and sale of goods. Accordingly, the Group will recognize revenue when, or to the extent that, it satisfies the performance obligations by transferring the goods or services that were promised to the customer.

Mobile and fixed-line service

Telecommunication service revenues include mobile and fixed-line(e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that is considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees).

Media and content services

Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading.

Media and contents services revenue are recognized when services are provided, based upon either usage or period of time.

Financial services

Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed.

Sale of goods

Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers.

(3) Allocation the transaction price and Revenue recognition

With the application of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer.

The Group verified the existence of two main performance obligations: (i) telecommunication services; and (ii) selling handsets.

To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct good or service underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The standalone selling price is the price at which the Group would sell a promised good or service separately to the customer. The best evidence of a stand-alone selling price is the observable price of a good or service when the

F-34

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Group sells that good or service separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

The adoption of the new revenue standard in some cases resulted in the early recognition of revenue from the sale of handsets, which are usually recognized upon the transfer of control to the customer, basically due to the allocation of discounts between the performance obligations arising from the sale of plans that include mobile services as well as handsets. The difference between the carrying value of sales of handsets, and the amount received from the customer is recorded as a contractual asset and/or liability at the beginning of the contract. Revenue from telecommunication services, in turn, will be recognized in the statement of income based on the allocation of the transaction price, and to the extent that services are being provided to customers in monthly basis.

(4) Incremental contract acquisition costs

The Group pays the commission fees to authorized dealers when new customer subscribe for telecommunication services. The incremental contract acquisition costs are those commission fess that the Group incurs to acquire a contract with a customer that it would not have incurred if the contract had not been acquired. According to IFRS 15, the Group recognizes as an asset the incremental contract acquisition costs and amortize it over the expected period of benefit. However, as a practical expedient, the Group may recognize the incremental contract acquisition costs as an expense when incurred if the amortization period of the asset is one year or less.

2.27 Current and Deferred Income Tax

The tax expense for the period consists of current and deferred tax. Current and deferred tax is recognized in profit or loss, except to the extent that it relates to items recognized in other comprehensive income or directly in equity. In this case, the tax is also recognized in other comprehensive income or directly in equity, respectively.

The tax expense is measured at the amount expected to be paid to the taxation authorities, using the tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period.

Management periodically evaluates tax policies that are applied in tax returns in which applicable tax regulation is subject to interpretation. The Group recognizes current income tax on the basis of the amount expected to be paid to the tax authorities.

Deferred income tax is provided in full, using the liability method, on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. However, deferred income tax is not accounted for if it arises from initial recognition of an asset or liability in a transaction other than a business combination that at the time of the transaction affects neither accounting nor taxable profit or loss.

Deferred tax assets are recognized only if it is probable that future taxable amount will be available to utilize those temporary differences and losses.

The Group recognizes a deferred tax liability all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint arrangements, except to the extent that the Group is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. In addition, The Group recognizes a deferred tax asset for all deductible temporary differences arising from such

F-35

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

investments to the extent that it is probable the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized.

Deferred tax assets and liabilities are offset when there is a legally enforceable right to offset current tax assets and liabilities and when the deferred tax balances relate to the same taxation authority. Current tax assets and tax liabilities are offset where the entity has a legally enforceable right to offset and intends either to settle on a net basis.

The Group adopts the consolidated corporate tax return and calculates income tax expenses and income tax liabilities of the Group based on systematic and reasonable methods.

2.28 Dividend

Dividend distribution to the Group’s shareholders is recognized as a liability in the financial statements in the period in which the dividends are approved by the Group’s shareholders.

2.29 Approval of the Financial Statements

The consolidated financial statements 2018 were approved for issue by the Board of Directors on March 29, 2019.

3. Critical Accounting Estimates and Assumptions

The preparation of financial statements requires the Group to make estimates and assumptions concerning the future. Management also needs to exercise judgement in applying the Group’s accounting policies. Estimates and assumptions are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. As the resulting accounting estimates will, by definition, seldom equal the related actual results, it can contain a significant risk of causing a material adjustment.

The estimates and assumptions that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year are discussed below. Additional information of significant judgement and assumptions of certain items are included in relevant notes.

3.1 Estimated Goodwill Impairment

The Group tests whether goodwill has suffered any impairment on an annual basis. The recoverable amount of cash-generating units (CGUs) is determined based on value-in-use calculations (Note 13).

3.2 Income Taxes

If certain portion of the taxable income is not used for investments or increase in wages or dividends in accordance with the Tax System For Recirculation of Corporate Income, the Group is liable to pay additional income tax calculated based on the tax laws. Accordingly, the measurement of current and deferred income tax is affected by the tax effects from the new tax system. As the Group’s income tax is dependent on the investments, increase in wages and dividends, there is an uncertainty measuring the final tax effects.

F-36

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

3.3 Fair Value of Derivatives and Financial Instruments

The fair value of financial instruments that are not traded in an active market is determined by using valuation techniques. The Group uses its judgment to select a variety of methods and make assumptions that are mainly based on market conditions existing at the end of each reporting period (Note 37).

3.4 Impairment of Financial Assets

The provision for impairment for financial assets are based on assumptions about risk of default and expected loss rates. The Group uses judgement in making these assumptions and selecting the inputs to the impairment calculation based on the Group’s past history, existing market conditions as well as forward looking estimates at the end of each reporting period.

3.5 Net Defined Benefit Liability

The present value of net defined benefit liability depends on a number of factors that are determined on an actuarial basis using a number of assumptions including the discount rate (Note 18).

3.6 Amortization of Contract Assets, Contract Liabilities and Contract Cost Assets

Contract assets, contract liabilities and contract cost assets recognized under the application of IFRS 15 are amortized over the expected periods of customer relationships which are from 20 months to 34 months. The estimate of the expected terms of customer relationship is based on the historical data. If management’s estimate changes, it may cause significant differences in the timing of revenue recognition and amounts recognized.

3.7 Provisions

As described in Note 17, the Group records provisions for litigation and assets retirement obligations at the end of the reporting period. The provisions are estimated based on the factors such as the historical experiences.

3.8 Useful Lives of Property and Equipment and Investment Property

The property and equipment, intangible assets, and investment properties, excluding land, goodwill, condominium memberships, golf club memberships and broadcast license, are depreciated using the straight-line method over their useful lives. The estimated useful lives are determined based on expected usage of the assets and the estimates can be materially affected by technical changes and other factors. The Group will increase depreciation expenses if the useful lives are considered shorter than the previously estimated useful lives.

F-37

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

4. Financial Instruments by Category

Financial instruments by category as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
Financial assets	Loans and receivables		Assets at fair value through profit and loss		Derivatives used for hedge		Available- for-sale		Held-to- Maturity		Total
Cash and cash equivalents	￦	1,928,182	￦	—	￦	—	￦	—	￦	—	￦	1,928,182
Trade and other receivables		6,793,397		—		—		—		—		6,793,397
Other financial assets		1,333,317		5,813		7,389		380,953		151		1,727,623

(In millions of Korean won)	December 31, 2017
Financial liabilities	Liabilities at fair value through profit and loss		Derivatives used for hedge		Financial liabilities at amortized cost		Total
Trade and other payables	￦	—	￦	—	￦	8,427,457	￦	8,427,457
Borrowings		—		—		6,683,662		6,683,662
Other financial liabilities		5,051		93,770		87,670		186,491

(In millions of Korean won)	December 31, 2018
Financial assets	Financial assets at amortized cost		Financial assets at fair value through profit or loss		Financial assets at fair value through other comprehensive income		Derivatives used for hedging		Total
Cash and cash equivalents	￦	2,703,422	￦	—	￦	—	￦	—	￦	2,703,422
Trade and other receivables		5,425,996		—		1,097,348		—		6,523,344
Other financial assets		484,271		777,685		326,157		29,843		1,617,956

(In millions of Korean won)	December 31, 2018
Financial liabilities	Financial liabilities at amortized cost		Financial liabilities at fair values through profit and loss		Derivatives used for hedging		Total
Trade and other payables	￦	8,521,379	￦	—	￦	—	￦	8,521,379
Borrowings		6,648,293		—		—		6,648,293
Other financial liabilities		99,330		7,758		57,308		164,396

Gains or losses arising from financial instruments by category for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Financial assets at amortized cost
Interest income1	￦	129,813		￦	108,608		￦	93,233
Gain(loss) on foreign currency transaction4		(7,493	)		(11,949	)		19,396
Gain(loss) on foreign currency translation		3,083			(12,354	)		(2,901	)
Gain(loss) on disposal		(15,838	)		(20,351	)		44
Loss on valuation		(92,589	)		(44,219	)		(110,544	)
Financial assets at fair value through profit or loss
Interest income1		—			—			9,194

F-38

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2016			2017			2018
Dividend income		—			—			1,207
Gain on valuation		—			—			10,768
Gain on disposal		—			—			1,713
Financial assets at fair value through other comprehensive income
Interest income1		—			—			163,390
Dividend income		—			—			1,704
Impairment loss		—			—			(2,416	)
Loss on disposal		—			—			(13,818	)
Other comprehensive income for the year2		—			—			43,811
Assets at fair value through profit or loss
Dividend income		—			1			—
Gain on disposal		186			153			—
Loss on valuation		(7,184	)		(464	)		—
Derivatives used for hedging
Gain(loss) on transaction		—			(58,569	)		7,272
Gain(loss) on valuation		109,436			(63,640	)		22,065
Other comprehensive income for the year2		60,501			(44,429	)		20,078
Reclassified to profit or loss from other comprehensive income for the year2,3		(71,915	)		50,231			(15,891	)
Available-for-sale
Interest income1		40			453			—
Dividend income		3,926			5,174			—
Gain on disposal		22,695			89,598			—
Impairment loss		(966	)		(6,137	)		—
Other comprehensive income for the year2		10,925			51,235			—
Reclassified to profit or loss from other comprehensive income for the year2		(3,840	)		(55,450	)		—
Held-to-Maturity
Interest income1,4		213			—			—
Financial liabilities at fair value through profit or loss
Loss on disposal		(632	)		—			—
Gain(loss) on valuation		33			(3,078	)		(2,708	)
Derivatives used for hedging
Gain on transactions		8,329			—			20,678
Loss on valuation		(138	)		(145,885	)		42,195
Other comprehensive income for the year2		4,295			(66,624	)		(2,810	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(3,956	)		91,698			(28,388	)
Financial liabilities at amortized cost
Interest expense1		(337,219	)		(302,464	)		(296,894	)
Gain(loss) on repayment		—			—			(15	)
Gain(loss) foreign currency transaction4		(7,518	)		62,347			(30,956	)
Gain(loss) foreign currency translation		(112,864	)		225,695			(66,050	)
Total	￦	(308,677	)	￦	(150,420	)	￦	(116,643	)

1 BC Card, a subsidiary of the Group, recognized interest income as operating revenue. Interest income recognized as operating revenue is ￦21,021 million (2016: ￦14,380 million, 2017: ￦15,561 million) for the year ended December 31, 2018.

F-39

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2 The amounts directly reflected in equity after adjustments of deferred income tax.

3 During the year, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year.

4 BC Card recognized gain/loss on foreign currency transaction as operating income and expenses. During the year, related gain/loss on foreign currency transaction recognized as operating income and expense is ￦20,422 million (2016: (-) ￦1,987 million, 2017: ￦11,049 million).

5. Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	Type	December 31, 2017	December 31, 2018	Description
Restricted cash and cash equivalents	Restricted deposit	￦16,837	￦23,970	Deposit restricted for governmental project and others

Cash and cash equivalents in the statement of financial position equal to cash and cash equivalents in the statement of cash flows.

6. Trade and Other Receivables

Trade and other receivables as at December 31, 2017 and 2018 are as follows:

	December 31, 2017
(In millions of Korean won)	Total amounts		Allowance for doubtful accounts			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,405,947	￦	(438,817	)	￦	(7,508	)	￦	2,959,622
Other receivables		3,071,532		(66,402	)		(187	)		3,004,943
	￦	6,477,479	￦	(505,219	)	￦	(7,695	)	￦	5,964,565
Non-current assets
Trade receivables	￦	366,108	￦	(610	)	￦	(12,803	)	￦	352,695
Other receivables		522,458		(17,970	)		(28,351	)		476,137
	￦	888,566	￦	(18,580	)	￦	(41,154	)	￦	828,832

	December 31, 2018
(In millions of Korean won)	Total amounts		Expected credit losses			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,422,086	￦	(357,548	)	￦	(9,873	)	￦	3,054,665
Other receivables		2,700,792		(74,948	)		(160	)		2,625,684
	￦	6,122,878	￦	(432,496	)	￦	(10,033	)	￦	5,680,349
Non-current assets
Trade receivables	￦	402,027	￦	(2,376	)	￦	(17,970	)	￦	381,681
Other receivables		506,061		(18,874	)		(25,873	)		461,314
	￦	908,088	￦	(21,250	)	￦	(43,843	)	￦	842,995

F-40

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The fair values of trade and other receivables with original maturities less than one year equal to their carrying amounts because the discounting effect is immaterial. The fair value of trade and other receivables with original maturities longer than one year, which are mainly from sales of goods, is determined discounting the expected future cash flow at the weighted average interest rate.

Details of changes in allowance for doubtful accounts the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016						2017						2018
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	468,741		￦	250,842		￦	470,871		￦	141,616		￦	439,427		￦	84,372
Provision		84,975			7,736			38,888			5,809			91,282			21,783
Reversal or written-off		(80,518	)		(108,638	)		(70,121	)		(61,220	)		(170,597	)		(14,520	)
Changes in the scope of consolidation		215			56			(107	)		(35	)		—			—
Others		(2,542	)		(8,380	)		(104	)		(1,798	)		(188	)		2,187
Ending balance	￦	470,871		￦	141,616		￦	439,427		￦	84,372		￦	359,924		￦	93,822

Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs.

Details of other receivables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Loans	￦	84,682		￦	88,476
Receivables1		3,000,849			2,612,753
Accrued income		12,186			10,171
Refundable deposits		391,458			370,481
Loans receivable		34,273			54,952
Finance lease receivables		20,526			22,230
Others		21,478			21,757
Less: Allowance for doubtful accounts		(84,372	)		(93,822	)
	￦	3,481,080		￦	3,086,998

1 The settlement receivables of BC Card Co., Ltd. of ￦1,895,575 million (2017: ￦2,262,829 million) are included.

The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at December 31, 2018.

A portion of the trade receivables is classified as financial assets at fair value through other comprehensive income considering the trade receivables business model for managing the asset and the cash flow characteristics of the contract.

F-41

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

7. Other Financial Assets and Liabilities

Details of other financial assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other financial assets
Financial assets at amortized cost1,2	￦	1,333,368		￦	484,271
Financial assets at fair value through profit or loss1,2,3		5,913			777,685
Financial assets at fair value through other comprehensive income2		—			326,157
Available-for-sale financial assets		380,953			—
Derivative used for hedging		7,389			29,843
Less: Non-current		(754,992	)		(623,176	)
Current	￦	972,631		￦	994,780
Other financial liabilities
Financial liabilities at amortized cost	￦	87,669		￦	99,330
Financial liabilities at fair value through profit or loss		5,051			7,758
Derivatives used for hedging		93,771			57,308
Less: Non-current		(149,267	)		(163,454	)
Current	￦	37,224		￦	942

1 As at December 31, 2018, the Group’s financial assets amounting to ￦60,978 million (2017: ￦59,660 million), which consist of checking account deposits, deposits for Win-win Growth Cooperative loans and payment guarantee, are subject to withdrawal restrictions.

2 In the prior year, a portion of the equity instruments was classified as available-for-sale financial assets and held-to-maturity financial assets

3 As at December 31, 2018, MMW(Money Market Wrap) and MMT(Money Market Trust) amounting to ￦610,862 million is included in other financial assets.

Details of financial assets at fair value through profit or loss as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)		121
Equity Instruments (Unlisted)		62,911
Debt securities		714,653
Total		777,685
Less: non-current		(269,148	)
Current	￦	508,537

The maximum exposure of debt instruments of financial assets recognized at fair value through profit or loss to credit risk is carrying amount as at December 31, 2018.

Investment in Korea Software Financial Cooperative amounting to ￦1,136 million is provided as collateral.

F-42

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

￦94,531 million of available-for-sales was classified as financial assets at fair value through profit or loss in the prior year.

Details of financial asset at fair value through other comprehensive income as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)	￦	8,861
Equity Instruments (Unlisted)		310,387
Debt securities		6,909
Total		326,157
Less: non-current		(326,157	)
Current	￦	—

￦257,819 million of available-for-sales was classified as financial assets at fair value through other comprehensive income in the prior year.

Upon disposal of these equity investments, any balance within the accumulated other comprehensive income for these equity investments is not classified to profit or loss, but to retained earnings. Upon disposal of debt investments, remaining balance of the accumulated other comprehensive income of debt instruments is reclassified to profit or loss

Derivatives used for hedge as at December 31, 2017 and 2018, are as follows:

	December 31, 2017						December 31, 2018
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	2,633		￦	—		￦	599
Currency swap2		7,389			81,300			29,843			54,074
Currency forwards3		—			9,838			—			2,635
Total		7,389			93,771			29,843			57,308
Less: non-current		(4,675	)		(56,547	)		(4,732	)		(56,366	)
Current	￦	2,714		￦	37,224		￦	25,111		￦	942

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the bond.

2 The currency swap contract is to hedge the risk of variability in cash flow from the bond. In applying the cash flow hedge accounting, the Group hedges its exposures to cash flow fluctuation until September 7, 2034.

3 The currency forward contract is to hedge the risk of variability in cash flow from transactions in foreign currencies due to changes in foreign exchange rate.

The full value of a hedging derivative is classified as a non-current asset or liability if the remaining maturity of the hedged item is more than 12 months and, as a current asset or liability, if the maturity of the hedged item is less than 12 months.

F-43

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The valuation gains and losses on the derivatives contracts for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016							2017							2018
Type of Transaction	Valuation gain		Valuation loss			Other comprehensive income1		Valuation gain		Valuation loss		Other comprehensive income1			Valuation gain		Valuation loss		Other comprehensive income1
Interest rate swap	￦	—	￦	148		￦	(142)	￦	38	￦	—	￦	637		￦	192	￦	—	￦	(488)
Currency swap		97,158		(10	)		85,479		19		187,468		(146,752	)		58,912		2,045		22,139
Currency forwards		12,278		—			146		—		22,114		(393	)		7,201		—		—
Total	￦	109,436	￦	138		￦	85,483	￦	57	￦	209,582	￦	(146,508)		￦	66,305	￦	2,045	￦	21,651

1 The amounts before adjustments of deferred income tax directly reflected in equity and allocation to the non-controlling interest.

The ineffective portion recognized in profit or loss on the cash flow hedge is valuation gain of ￦263 million for the current period (2016: valuation gain of ￦1,637 million, 2017: valuation loss of ￦1,961 million).

Details of financial liabilities at fair value through profit or loss as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	5,051	￦	7,758

The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017				2018
	Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	3,078	￦	—	￦	2,707

8. Inventories

Inventories as at December 31, 2017 and 2018, are as follows:

	December 31, 2017							December 31, 2018
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	504,321	￦	(58,293	)	￦	446,028	￦	794,020	￦	(113,581	)	￦	680,439
Others		195,999		—			195,999		394,195		—			394,195
Total	￦	700,320	￦	(58,293	)	￦	642,027	￦	1,188,215	￦	(113,581	)	￦	1,074,634

Cost of inventories recognized as expenses for year ended December 31, 2018, amounts to ￦3,926,199 million (2016: ￦3,589,809 million, 2017: ￦3,855,089 million) and valuation loss on inventory recognized amounts to ￦55,288 million for year ended December 31, 2018 (2016: reversal of valuation allowance of ￦20,223 million, 2017: valuation loss on inventory amounts to ￦11,165 million,).

F-44

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

9. Other Assets and Liabilities

Other assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other assets
Advance payments	￦	164,950		￦	162,784
Prepaid expenses1		241,078			1,667,372
Contract assets1		—			398,797
Others		5,997			4,490
Less: Non-current		(107,165	)		(545,895	)
Current	￦	304,860		￦	1,687,548
Other liabilities
Advances received	￦	375,792		￦	518,914
Withholdings		85,142			89,403
Unearned revenue		23,036			39,528
Contract liabilities1		—			347,462
Others		11,628			24,908
Less: Non-current		(237,284	)		(423,626	)
Current	￦	258,314		￦	596,589

1 As explained in Note 2, amounts include adjustments arising from adoption of IFRS 15(notes 26 and 41)

10. Assets Held for Sale

The Group decided to sell total shares of PT Mitra Transksi Indonesia, investments in associates, with the approval of the Board of Directors and shareholders. At the end of the reporting period, the associated asset amounting to ￦13,035 million is presented as held for sale. After classifying the asset as held for sale, share of net profit or loss from the associate is not recognized.

F-45

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

11. Property and Equipment

Changes in property and equipment for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,309,084		￦	3,729,228		￦	35,106,184		￦	1,895,332		￦	1,093,941		￦	43,133,769
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,604,496	)		(25,845,999	)		(1,370,409	)		(622	)		(28,821,658	)
Beginning, net		1,308,952			2,124,732			9,260,185			524,923			1,093,319			14,312,111
Acquisition and capital expenditure		1,948			120			237,218			129,464			2,262,681			2,631,431
Disposal and termination		(4,656	)		(4,022	)		(176,085	)		(8,242	)		(3,133	)		(196,138	)
Depreciation		—			(135,242	)		(2,469,459	)		(150,535	)		—			(2,755,236	)
Impairment		—			—			(9,256	)		(1	)		(28	)		(9,285	)
Transfer in (out)		26,764			25,305			2,227,808			10,344			(2,600,908	)		(310,687	)
Exclusion from scope of consolidation		—			(19	)		(772	)		(120	)		(34	)		(945	)
Transfer from(to) investment properties		(64,449	)		1,793			—			1,184			—			(61,472	)
Others		98			(245	)		(8,830	)		(179	)		(38,304	)		(47,460	)
Ending, net	￦	1,268,657		￦	2,012,422		￦	9,060,809		￦	506,838		￦	713,593		￦	13,562,319
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)

	2018
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)
Beginning, net		1,268,657			2,012,422			9,060,809			506,838			713,593			13,562,319
Acquisition and capital expenditure		9,897			1,728			137,088			101,832			2,037,085			2,287,630
Disposal and termination		(3,718	)		(2,640	)		(113,266	)		(4,336	)		(582	)		(124,542	)
Depreciation		—			(132,353	)		(2,398,782	)		(159,625	)		—			(2,690,760	)
Impairment		—			(5,551	)		(1,237	)		(8,935	)		(170	)		(15,893	)
Transfer in (out)		7,663			127,052			1,767,878			9,525			(1,911,094	)		1,024
Inclusion in scope of consolidation		—			44			4,228			2,526			—			6,798
Transfer from(to) investment properties		(3,080	)		5,366			—			37,077			—			39,363
Others		1,768			1,617			18,298			(6,521	)		(12,844	)		2,318
Ending, net	￦	1,281,187		￦	2,007,685		￦	8,475,016		￦	478,381		￦	825,988		￦	13,068,257
Acquisition cost	￦	1,281,319		￦	3,873,074		￦	36,327,007		￦	1,981,646		￦	826,583		￦	44,289,629
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,865,389	)		(27,851,991	)		(1,503,265	)		(595	)		(31,221,372	)

F-46

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of property and equipment provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,115	￦	15,995		Borrowings	￦	2,730	Standard Chartered Bank, Korea Development Bank
Others		53,757		38,570				16,071	Shinhan Bank

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,163	￦	15,113		Borrowings	￦	7,878	Standard Chartered Bank, Korea Development Bank
Others		50,278		40,252				10,063	Shinhan Bank

The borrowing costs capitalized for qualifying assets amount to ￦7,329 million (2017: ￦8,473) in 2018. The interest rate applied to calculate the capitalized borrowing costs in 2018 is 3.22% (2017: 3.37% to 3.54%).

12. Investment Properties

Changes in investment properties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	302,750		￦	1,119,885		￦	78,765		￦	1,501,400
Less: Accumulated depreciation		—			(353,356	)		—			(353,356	)
Beginning, net		302,750			766,529			78,765			1,148,044
Acquisition		—			775			48,075			48,850
Disposal and termination		(3,493	)		(6,434	)		—			(9,927	)
Depreciation		—			(47,295	)		—			(47,295	)
Transfer from(to) property and equipment		64,449			(1,793	)		(1,184	)		61,472
Transfer and others		(6,916	)		80,986			(85,683	)		(11,613	)
Ending, net	￦	356,790		￦	792,768		￦	39,973		￦	1,189,531
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(398,919	)		—			(400,487	)

F-47

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2018
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation		(1,568	)		(398,919	)		—			(400,487	)
Beginning, net		356,790			792,768			39,973			1,189,531
Acquisition		1,111			7			74,145			75,263
Disposal and termination		(4,729	)		(10,238	)		—			(14,967	)
Depreciation		—			(44,653	)		—			(44,653	)
Transfer from(to) property and equipment		3,080			(5,366	)		(37,077	)		(39,363	)
Transfer and others		(7,404	)		9,597			(76,920	)		(74,727	)
Ending, net	￦	348,848		￦	742,115		￦	121		￦	1,091,084
Acquisition cost	￦	350,417		￦	1,168,379		￦	121		￦	1,518,917
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,569	)		(426,264	)		—			(427,833	)

The fair value of investment properties is ￦1,821,061 million as at December 31, 2018 (2017: ￦1,755,600 million). The fair value of investment properties is estimated based on the expected cash flow.

Rental income from investment properties is ￦207,795 million in 2018 (2017: ￦205,993 million) and direct operating expenses (including repairs and maintenance) arising from investment properties that generated rental income during the period are recognized as operating expenses.

Details of investment properties provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	583,778	￦	74,963	Deposits	￦	63,923
Land and Buildings	￦	7,897	￦	7,905	Borrowings	￦	5,270

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	548,567	￦	66,551	Deposits	￦	59,492
Land and Buildings	￦	5,292	￦	3,987	Borrowings	￦	3,322

F-48

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

13. Intangible Assets

Changes in intangible assets for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Goodwill			Development costs1			Software			Frequency usage rights			Others			Total
Acquisition cost		492,105			1,483,205			838,532			2,531,654			1,154,993			6,500,489
Less: Accumulated amortization (including accumulated impairment loss and others)		(238,619	)		(1,148,529	)		(641,394	)		(854,365	)		(594,779	)		(3,477,686	)
Beginning, net	￦	253,486		￦	334,676		￦	197,138		￦	1,677,289		￦	560,214		￦	3,022,803
Acquisition and capital expenditure		—			247,863			60,475			—			78,373			386,711
Disposal and termination		—			(14,806	)		(548	)		—			(11,859	)		(27,213	)
Amortization		—			(151,718	)		(73,174	)		(311,146	)		(99,112	)		(635,150	)
Impairment		(84,606	)		—			(3	)		—			(31,486	)		(116,095	)
Exclusion in scope of consolidation		—			(332	)		(3,216	)		—			(1,374	)		(4,922	)
Others		—			2,876			9,569			(1,201	)		(4,674	)		6,570
Ending, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,704
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,014
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)

1 The Group’s development costs mainly consist of acquisition costs to develop a combined billing system and an information management system.

	2018
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,013
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)
Beginning, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,703
Acquisition and capital expenditure		—			56,670			29,800			1,110,865			133,837			1,331,172
Disposal and termination		—			(3,436	)		(736	)		(558	)		(10,687	)		(15,417	)
Amortization		—			(147,304	)		(72,185	)		(318,815	)		(91,222	)		(629,526	)
Impairment		(518	)		—			(222	)		—			(12,256	)		(12,996	)
Inclusion in scope of consolidation		67,696			—			2,073			—			23,950			93,719
Others		—			10,621			16,973			66			(20,192	)		7,468
Ending, net	￦	236,058		￦	335,110		￦	165,944		￦	2,156,500		￦	513,511		￦	3,407,123
Acquisition cost		542,074			1,680,372			947,312			3,641,231			1,253,281			8,064,270
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,016	)		(1,345,262	)		(781,368	)		(1,484,731	)		(739,770	)		(4,657,147	)

F-49

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The carrying amount of membership rights and others, excluding goodwill, with indefinite useful life not subject to amortization is ￦239,619 million (2017: ￦238,053) as at December 31, 2018.

The Group won a portion of the 3.5GHz and 28GHz bands at an auction in June 2018 under Article 11 (Assignment of Radio Frequencies for Consideration) of the Radio Waves Act. The purchase consideration for the right to use a radio frequency of the 3.5GHz and 28GHz bands are ￦968,000 million and ￦207,800 million, respectively. The group made down payments for the 3.5 GHz and 28 GHz bands in November 2018, and the remaining consideration for the 3.5 GHz and 28GHz bands will be paid in installments annually for 10 years and 5 years, respectively.

Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As at December 31, 2018, goodwill allocated to each cash-generation unit is as follows:

(In millions of Korean won) Cash generating Unit	Amount
Marketing/Customer
Telecom Wireless business1	￦	65,057
Finance
BC Card Co., Ltd.2		41,234
Others
GENIE Music Corporation (KT Music Corporation)3		55,114
PlayD Co., Ltd. (N SEARCH MARKETING Corporation)4		42,745
KT Telecop Co., Ltd.1		15,418
KT MOS Bukbu Co., Ltd and others		16,490
Total	￦	236,058

1 The recoverable amounts of mobile business are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 1.34% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 7.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on mobile business for the years ended December 31, 2018 and 2017.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 2.80% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 15.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the

F-50

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018 and 2017.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on value in use calculation or fair value less cost to sell.

4 The recoverable amounts of PlayD Co., Ltd. (N search Marketing Co., Ltd.) are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 1.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 5.44% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.42% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on PlayD Co., Ltd. (N search Marketing Co., Ltd.) for the years ended December 31, 2018 and 2017.

In prior year, the recoverable amounts of Satellite TV segment are calculated based on value-in use calculations or fair value less costs to sell. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate (-0.77%) based on past performance and its expectation of future market changes. The Group determined cash flow projections based on past performance and its estimation of market growth. Specific risk of related operating segment was reflected in its 13.25% discount rate.

As a result of the impairment test, the Group recognized the impairment losses of ￦ 78,200 million on goodwill allocated to Satellite TV segment and ￦ 29,325 million on indefinite-lived intangible assets, and recognized the losses as operating expenses in the consolidated statement of profit or loss for the year ended December 31, 2017. It was resulted from intense competition between internets, IPTV, Cable TV service providers.

14. Investments in Associates and Joint Ventures

Details of associates as at December 31, 2017 and 2018, are as follows:

	Percentage of ownership (%)						Location	Date of financial statements
	2017			2018
Korea Information & Technology Fund		33.3	%		33.3	%	Korea		December 31
KT-SB Venture Investment Fund1		50.0	%		50.0	%	Korea		December 31
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%	Korea		December 31
KT-CKP New Media Investment Fund		49.7	%		49.7	%	Korea		December 31
K Bank Inc.1		10.0	%		10.0	%	Korea		December 31

F-51

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 At the end of the reporting period, even though the Group (KT-SB Venture Investment Fund and KT-IBKC Future Investment Fund 1) has 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, cannot participate in determining the operating and financial policies. Also, 8.8% of non-voting convertible stock are excluded in deriving percentage of ownership of K bank Inc.

Changes in investments in associates and joint ventures for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures			Impairment			Others			Ending
Korea Information & Technology Fund	￦	134,969	￦	—		￦	4,275		￦	—		￦	290		￦	139,534
KT-SB Venture Investment Fund		4,736		(1,069	)		(725	)		—			—			2,942
Mongolian Telecommunications		6,244		—			(348	)		—			(5,896	)		—
KT Wibro Infra Co., Ltd.		52,200		(52,200	)		—			—			—			—
KT-IBKC Future Investment Fund1		3,621		7,500			(296	)		—			—			10,825
KT-CKP New Media Investment Fund		4,454		(2,970	)		810			—			—			2,294
K Bank Inc.		—		26,543			(17,244	)		—			32,809			42,108
Others		77,851		3,178			(1,952	)		(3,662	)		6,313			81,728
	￦	284,075	￦	(19,018	)	￦	(15,480	)	￦	(3,662	)	￦	33,516		￦	279,431

	2018
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Impairment		Others			Ending
Korea Information & Technology Fund	￦	139,534	￦	—		￦	15,037		￦	—	￦	(6,316	)	￦	148,255
KT-SB Venture Investment Fund		2,942		—			1,528			—		—			4,470
KT-IBKC Future Investment Fund1		10,825		(1,050	)		1,028			—		(842	)		9,961
KT-CKP New Media Investment Fund		2,294		(1,229	)		(784	)		—		—			281
K Bank Inc.		42,108		26,725			(19,504	)		—		3,326			52,655
Others2		81,728		2,466			8,607			—		(36,016	)		56,785
	￦	279,431	￦	26,912		￦	5,912		￦	—	￦	(39,848	)	￦	272,407

1 KT investment Co., Ltd., a subsidiary of the Group, recognized its share in net profit from associates and joint ventures as operating revenue and expense. These include its share in net loss from associates and joint ventures of ￦445 million (2017: ￦1,588 million) recognized as operating expense during the period.

F-52

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2 The Group classified total shares of PT Mitra Transksi Indonesia as assets held for sale (Note 10).

Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	144,874	￦	273,727	￦	—	￦	—
KT-SB Venture Investment		120		5,770		6		—
KT-IBKC Future Investment Fund 1		5,499		16,302		152		—
KT-CKP New Media Investment Fund		287		4,333		—		—
K Bank Inc.		1,258,969		92,137		1,116,154		1,177

(In millions of Korean won)	2017
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	36,462	￦	12,825		￦	1,868		￦	14,693		￦	739
KT-SB Venture Investment		3		(1,449	)		—			(1,449	)		—
KT-IBKC Future Investment Fund 1		15		(593	)		—			(593	)		—
KT-CKP New Media Investment Fund		1,593		1,632			—			1,632			—
K Bank Inc.		20,926		(83,787	)		(746	)		(84,533	)		—

(In millions of Korean won)	December 31, 2018
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	118,024	￦	326,740	￦	—	￦	—
KT-SB Venture Investment		4,322		4,624		6		—
KT-IBKC Future Investment Fund 1		19,922		—		—		—
KT-CKP New Media Investment Fund		25		540		—		—
K Bank Inc.		2,094,152		90,505		1,901,389		3,185

(In millions of Korean won)	2018
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	59,524	￦	45,110		￦	(13,422	)	￦	31,688		￦	1,842
KT-SB Venture Investment		—		3,056			—			3,056			—
KT-IBKC Future Investment Fund 1		2,665		2,057			—			2,057			—
KT-CKP New Media Investment Fund		371		(629	)		—			(629	)		—
K Bank Inc.		66,787		(79,671	)		1,432			(78,440	)		—

F-53

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures as at and for the years end December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	418,601		33.33	%	￦	139,534	￦	—	￦	139,534
KT-SB Venture Investment		5,884		50.00	%		2,942		—		2,942
KT-IBKC Future Investment Fund 1		21,649		50.00	%		10,825		—		10,825
KT-CKP New Media Investment Fund		4,620		49.67	%		2,294		—		2,294
K Bank Inc.1		233,775		10.00	%		42,108		—		42,108

1 8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

	December 31, 2018
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	444,764		33.33	%	￦	148,255	￦	—	￦	148,255
KT-SB Venture Investment		8,940		50.00	%		4,470		—		4,470
KT-IBKC Future Investment Fund 1		19,922		50.00	%		9,961		—		9,961
KT-CKP New Media Investment Fund		565		49.70	%		280		—		280
K Bank Inc.1		280,083		10.00	%		52,655		—		52,655

1 8.8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

Due to discontinuance of equity method of accounting, the Group has not recognized loss from associates and joint ventures of ￦1,908 million for the year ended December 31, 2018 (for the year ended December 31, 2017: ￦4,391 million). The accumulated comprehensive loss of associates and joint ventures as at December 31, 2018, which was not recognized by the Group is ￦6,475 million (as at December 31, 2017: ￦17,045 million).

F-54

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

15. Trade and Other Payables

Details of trade and other payables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Current liabilities
Trade payables	￦	1,399,287	￦	1,236,489
Other payables		6,026,801		5,771,026
Total	￦	7,426,088	￦	7,007,515
Non-current liabilities
Trade payables	￦	4,787	￦	3,207
Other payables		996,582		1,510,657
Total	￦	1,001,369	￦	1,513,864

Details of other payables as at December 31, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Non-trade payables1	￦	4,775,177		￦	5,191,268
Accrued expenses		1,011,089			904,135
Operating deposits		850,999			819,968
Others		386,118			366,312
Less: non-current		(996,582	)		(1,510,657	)
Current	￦	6,026,801		￦	5,771,026

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦1,996,320 million related to credit card transactions are included as at December 31, 2018 (2017: ￦2,365,477 million).

F-55

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

16. Borrowings

Details of borrowings as at December 31, 2017 and 2018, are as follows:

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 07, 2034	6.50%		USD 100,000	￦	107,140			USD 100,000	￦	111,810
FR notes		Aug. 28, 2018	—		USD 300,000		321,420			—		—
MTNP notes		Apr. 22, 2019	2.63%		USD 350,000		374,990			USD 350,000		391,335
MTNP notes		Jan. 29, 2018	—		JPY 6,800,000		64,539			—		—
MTNP notes		Feb. 23, 2018	—		JPY 15,000,000		142,367			—		—
MTNP notes		July 18, 2026	2.50%		USD 400,000		428,560			USD 400,000		447,240
MTNP notes		Aug 07, 2022	2.63%		USD 400,000		428,560			USD 400,000		447,240
FR notes2		Aug 23, 2020	LIBOR(3M)+0.40%		—		—			USD 200,000		223,620
FR notes2		Aug 23, 2023	LIBOR(3M)+0.90%		—		—			USD 100,000		111,810
MTNP notes		July 06, 2020	0.31%		—		—			JPY 4,000,000		40,527
MTNP notes		July 06, 2021	0.38%		—		—			JPY 16,000,000		162,109
MTNP notes		Nov 13, 2020	0.30%		—		—			JPY 30,000,000		303,954
The 173-2nd Public bond		Aug. 06, 2018	—		—		100,000			—		—
The 179th Public bond		Mar. 29, 2018	—		—		260,000			—		—
The 180-2nd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
The 181-2nd Public bond		Aug. 26, 2018	—		—		90,000			—		—
The 181-3rd Public bond		Aug. 26, 2021	4.09%		—		250,000			—		250,000
The 182-2nd Public bond		Oct. 28, 2021	4.31%		—		100,000			—		100,000
The 183-2nd Public bond		Dec. 22, 2021	4.09%		—		90,000			—		90,000
The 183-3rd Public bond		Dec. 22, 2031	4.27%		—		160,000			—		160,000
The 184-1st Public bond		Apr. 10, 2018	—		—		120,000			—		—
The 184-2nd Public bond		Apr. 10, 2023	2.95%		—		190,000			—		190,000
The 184-3rd Public bond		Apr. 10, 2033	3.17%		—		100,000			—		100,000
The 185-1st Public bond		Sept. 16, 2018	—		—		200,000			—		—
The 185-2nd Public bond		Sept. 16, 2020	3.65%		—		300,000			—		300,000
The 186-2nd Public bond		June 26, 2019	3.08%		—		170,000			—		170,000
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2034	3.70%		—		100,000			—		100,000
The 187-2nd Public bond		Sept. 02, 2019	2.97%		—		220,000			—		220,000
The 187-3rd Public bond		Sept. 02, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 02, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	2.26%		—		160,000			—		160,000
The 188-2nd Public bond		Jan. 29, 2025	2.45%		—		240,000			—		240,000
The 188-3rd Public bond		Jan. 29, 2035	2.71%		—		50,000			—		50,000
The 189-1st Public bond		Jan. 28, 2019	1.76%		—		100,000			—		100,000
The 189-2nd Public bond		Jan. 28, 2021	1.95%		—		130,000			—		130,000
The 189-3rd Public bond		Jan. 28, 2026	2.20%		—		100,000			—		100,000
The 189-4th Public bond		Jan. 28, 2036	2.35%		—		70,000			—		70,000
The 190-1st Public bond		Jan. 29, 2021	2.55%		—		—			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		—			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		—			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		—			—		70,000
The 17th unsecured bond		Apr. 22, 2018	—		—		60,000			—		—
							5,987,576					6,029,645
Less: Current portion							(1,357,776	)				(880,940	)
Discount on bonds							(19,347	)				(20,056	)
Total						￦	4,610,453				￦	5,128,649

F-56

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 As at December 31, 2018, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered in the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTN Program has been suspended since 2007.

2 Libor (3M) are approximately 2.808 % as at December 31, 2018.

Short-term borrowings

	(In millions of Korean won)		December 31, 2017		December 31, 2018
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	3.78%	￦	—	￦	15,000
	Shinhan Bank	3.70% ~ 4.72%		113,300		59,800
	Sinhan Bank, Indonesia	8.90%		—		614
	Korea Development Bank	2.50% ~ 4.35%		12,000		16,200
	SooHyup Bank	4.57%		3,000		1,000
	Total		￦	128,300	￦	92,614

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Financial institution	Type	Annual interest rates		Foreign currency		Korean won			Foreign currency		Korean won
Export-Import Bank of Korea	Inter-Korean Cooperation Fund1		1.50%		—	￦	4,688			—	￦	3,948
Shinhan Bank	General loans		2.93%		—		30,000			—		5,000
	Facility loans		3.01%		—		6,000			—		30,000
	Vessel facility loans2		LIBOR(3M)+0.706%		USD 15,000		16,071			USD 9,000		10,063
KEB Hana Bank	General loans		3.95%		—		3,000			—		—
Standard Charted Bank	General loans		3.16%		—		8,000			—		6,000
NongHyup Bank	General loans		2.86%		—		8,000			—		8,000
	Facility loans		2.00%		—		123			—		104
Korea Development Bank	General loans		3.02%		—		—			—		10,000
	General loans		3.30%		—		30,000			—		30,000
Kookmin Bank	Facility loans		2.59%		—		2,333			—		—
NH Investment & Security Co., Ltd.	Commercial papers		3.17%		—		300,000			—		300,000
Others	Redeemable convertible preferred stock3		1.00%		—		950			—		950
	Kookmin Bank and other2		4.59%		USD 166,108		177,968			USD 127,023		142,025
						￦	587,133				￦	546,090
	Less: Current portion					￦	(87,398	)			￦	(394,927	)
	Total					￦	499,735				￦	151,163

F-57

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period.

2 LIBOR(3M) is approximately 2.808% as at December 31, 2018.

3 Skylife TV Co., Ltd., a subsidiary of the Group, issued 1,900,000 of redeemable convertible preferred stock with a par value per share of ￦500 in 2010.

Repayment schedule of the Group’s borrowings including the portion of current liabilities as at December 31, 2018, is as follows:

(In millions of Korean won)
	Debentures						Borrowings						Total
	In local currency		In foreign currency		Sub- total		In local currency		In foreign currency		Sub- total
Jan 1, 2019 ~ Dec 31, 2019	￦	490,000	￦	391,335	￦	881,335	￦	436,518	￦	51,023	￦	487,541	￦	1,368,876
Jan 1, 2020 ~ Dec 31, 2020		460,000		568,101		1,028,101		1,468		47,054		48,522		1,076,623
Jan 1, 2021 ~ Dec 31, 2021		1,060,000		162,109		1,222,109		45,518		43,700		89,218		1,311,327
Jan 1, 2022 ~ Dec 31, 2022		—		447,240		447,240		518		10,925		11,443		458,683
After 2023		1,780,000		670,860		2,450,860		1,980		—		1,980		2,452,840
	￦	3,790,000	￦	2,239,645	￦	6,029,645	￦	486,002	￦	152,702	￦	638,704	￦	6,668,349

17. Provisions

Changes in provisions for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	19,038		￦	101,312		￦	76,829		￦	197,179
Increase (Transfer)		3,842			2,827			41,550			48,219
Usage		(1,740	)		(2,178	)		(22,382	)		(26,300	)
Reversal		(2,834	)		(1,723	)		(11,467	)		(16,024	)
Change in scope of consolidation		—			(22	)		(22	)		(44	)
Ending balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Current		17,238			1,766			59,168			78,172
Non-current		1,068			98,450			25,340			124,858
	2018
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Increase (Transfer)		44,593			25,975			33,378			103,946
Usage		(3,002	)		(3,181	)		(11,780	)		(17,963	)
Reversal		(1,137	)		(4,182	)		(1,818	)		(7,137	)
Ending balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Current		14,513			1,736			101,632			117,881
Non-current		44,247			117,092			2,656			163,995

F-58

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

18. Net Defined Benefit Liabilities

The amounts recognized in the statements of financial position are determined as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Present value of defined benefit obligations	￦	1,911,166		￦	2,201,876
Fair value of plan assets		(1,519,779	)		(1,643,046	)
Liabilities	￦	395,079		￦	561,269
Assets in the statement of financial position	￦	3,692		￦	2,439

Changes in the defined benefit obligations for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,713,184		￦	1,911,166
Current service cost		210,336			225,667
Interest expense		38,994			51,691
Benefit paid		(154,600	)		(121,372	)
Changes due to settlements of plan		(61	)		9,801
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		3,353			4,600
Actuarial gains and losses arising from changes in financial assumptions		36,946			116,458
Actuarial gains and losses arising from experience adjustments		63,583			(19,919	)
Changes in scope of Consolidation		(569	)		23,784
Ending	￦	1,911,166		￦	2,201,876

Changes in the fair value of plan assets for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,334,780		￦	1,519,779
Interest income		30,303			41,233
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(5,557	)		1,409
Benefits paid		(130,510	)		(116,303	)
Employer contributions		290,895			179,100
Changes in scope of consolidation		(132	)		17,828
Ending	￦	1,519,779		￦	1,643,046

F-59

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Amounts recognized in the statement of profit or loss for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Current service cost	￦	205,114		￦	210,336		￦	225,667
Net Interest cost		12,141			8,691			10,458
Past service cost		424			(61	)		9,801
Transfer out		(8,737	)		(9,196	)		(13,881	)
Total expenses	￦	208,942		￦	209,770		￦	232,045

Principal actuarial assumptions used are as follows:

	December 31, 2016	December 31, 2017	December 31, 2018
Discount rate	2.43%	2.76%	2.77%
Future salary increase	4.10%	4.51%	4.61%

The sensitivity of the defined benefit obligations as at December 31, 2018, to changes in the principal assumptions is:

(In percentage, in millions of Korean won)	Effect on defined benefit obligation
	Changes in assumption	Increase in assumption			Decrease in assumption
Discount rate	0.5% point	￦	(72,851	)	￦	82,527
Salary growth rate	0.5% point		75,647			(63,267	)

A decrease in corporate bond yields will increase plan liabilities, although this will be partially offset by an increase in the value of the plans’ bond holdings.

The above sensitivity analyses are based on an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the projected unit credit method, the same method applied when calculating the defined benefit obligations recognized on the statement of financial position.

The Group actively monitors how the duration and the expected yield of the investments match the expected cash outflows arising from the pension obligations. Expected contributions to post-employment benefit plans for the year ending December 31, 2019, are ￦320,899 million.

The expected maturity analysis of undiscounted pension benefits as at December 31, 2018, is as follows:

(In millions of Korean won)	Less than 1 year		Between 1-2 years		Between 2-5 years		Over 5 years		Total
Pension benefits	￦	183,106	￦	225,706	￦	726,283	￦	3,972,768	￦	5,107,863

The weighted average duration of the defined benefit obligations is 7.4 years.

19. Defined Contribution Plan

Recognized expense related to the defined contribution plan for the year ended December 31, 2018, is ￦48,210 million (2016: ￦46,023 million, 2017: ￦45,936 million).

F-60

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

20. Commitments and Contingencies

As at December 31, 2018, major commitments with local financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency		Limit		Used amount
Bank overdraft	Kookmin Bank and others		KRW		1,697,000		—
Commercial papers	NH Investment & Securities Co., Ltd.		KRW		300,000		300,000
Inter-Korean Cooperation Fund	Export-Import Bank of Korea		KRW		37,700		3,948
Collateralized loan on electronic accounts receivable-trade	Shinhan Bank and others		KRW		495,560		70,759
Plus electronic notes payable	Industrial Bank of Korea		KRW		50,000		960
Loans for working capital	Korea Development Bank and others		KRW		254,300		158,000
Facility loans	Shinhan Bank and others		KRW		10,123		8,406
	Kookmin Bank and others		USD		212,000		127,024
Facility loans on ships	Shinhan Bank		USD		9,000		9,000
Export L/C	Shinhan Bank		USD		—		1,156
Derivatives transaction limit	Korea Development Bank		KRW		100,000		64,622
FX forward trading commitment	Shinhan Bank		USD		11,500		—
Total			KRW		2,944,683		606,695
			USD		232,500		137,180

As at December 31, 2018, guarantees received from financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency			Limit
Performance guarantee	Seoul Guarantee Insurance and others		KRW			299,689
			USD			1,200
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD			5,980
Guarantee for payment in Korean currency	Shinhan Bank and others		KRW			5
Guarantee for payment in foreign currency	KEB Hana and others		USD			51,766
			PLN	1		23,000
Comprehensive credit line	KEB Hana Bank and others		KRW			40,000
Comprehensive credit line	KEB Hana Bank		USD			10,000
Bid guarantee	KEB Hana Bank		USD			400
Bid guarantee			KRW			58,992
Performance guarantee /Warranty Guarantee	Korea Software Financial Cooperative and others		KRW			376,420
Guarantee for advances received/others			KRW			124,901
Bid guarantee			KRW			350
Warranty guarantee			KRW			1,037
Guarantees for licensing			KRW			4,070
Performance guarantee/Warranty Guarantee	Seoul Guarantee Insurance		KRW			996
Guarantee for public sale			KRW			120
Guarantee for deposits			KRW			3,525
Total			KRW			910,105
			USD			69,346
			PLN	1		23,000

1 Polish Zloty.

F-61

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

As at December 31, 2018, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won and thousands of foreign currencies)	Subject to payment guarantees	Creditor	Currency		Limit		Used amount		Period
KT Estate Inc.	Busan Gaya Centreville Buyers	Shinhan Bank		KRW		4,854		2,503		Nov 10, 2017 ~Oct. 31, 2020
KT Estate Inc.	Daegu Beomeo-Crossroads SeohanIDaum Buyers	Shinhan Bank		KRW		8,172		4,271		Oct 29, 2017 ~Nov. 30, 2020
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		KRW		538		—		Apr 19, 2018 ~Apr 19, 2019
KT Hitel Co., Ltd.	Korea Software Financial Cooperative	Yonsei University and others		KRW		34,715		1,616		Oct 22, 2018 ~Oct 22, 2021
BC Card Co., Ltd	PT BCcard Asia Pacific	Shinhan Bank, Indonesia		IDR		8,000,000		8,000,000		Sep 18, 2018 ~Sep 17, 2019

The Controlling Company is jointly and severally obligated with KT Sat Co., Ltd. to pay KT Sat Co., Ltd.’s liabilities incurred prior to spin-off. As at December 31, 2018, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ￦3,480 million.

For the year ended December 31, 2018, the Group made agreements with the Securitization Specialty Companies (2018: Giga LTE Thirty seventh to Forty second Securitization Specialty Co., Ltd., 2017: Giga LTE Thirty first to Thirty sixth Securitization Specialty Co., Ltd.), and disposed of its trade receivables related to handset sales. The Group also made asset management agreements with each securitization specialty company and in accordance with the agreement the Group will receive asset management fees upon liquidation of securitization specialty company.

As at December 31, 2018, the Group is a defendant in 172 lawsuits with the total claimed amount of ￦169,246 million (2017: ￦112,639 million). As at December 31, 2018, litigation provisions of ￦58,776 million for pending lawsuits and unasserted claims are recorded as liabilities for potential loss in the ordinary course of business. The final outcomes of the cases cannot be estimated at the end of the reporting period.

In December 2013, Asia Broadcast Satellite Holdings Ltd. (“ABS”) filed a request for meditation to the International Chamber of Commerce (“ICC”) for the compensation of damages from the ownership of the satellite Koreasat-3 (“K3”) and the alleged breach of the entrustment control contract related to K3, which was made and entered into with the Controlling Company and its subsidiary, KT Sat Co., Ltd. In July 2017, the ICC issued a partial ruling that ABS has the ownership of K3, and in March 2018, the final ruling was issued that KT Sat co., Ltd. should pay compensation for damages to ABS. However, in October 2017, the Controlling Company and its subsidiary, KT Sat Co., Ltd. filed a lawsuit seeking the cancellation of the partial ruling in the Federal Court of New York, and filed the other lawsuit in May 2018 seeking the cancellation of the final ruling. The Federal Court of New York dismissed the first case in April and the second case in July 2018. The Controlling Company and its subsidiary, KT Sat Co., Ltd. filed an appeal to the US Court of Appeals for the Second Circuit in August 2018. The outcome of the appeal cannot be reasonably estimated at the end of the reporting period.

F-62

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

According to the financial and other covenants included in certain debentures and borrowings, the Group is required to maintain certain financial ratios such as debt-to-equity ratio, use the funds for the designated purpose and report to the creditors periodically. The covenant also contains restriction on provision of additional collateral and disposal of certain assets.

At the end of the reporting period, the Group is offering construction completion guarantee agreement to development of Nonsan Hwagidong apartment complex. If a contingent event occurs in between November 24, 2017 and to August 9, 2019, the Group collaterally guarantees the debt of AbleNS 1st Co. up to ￦6,000 million.

At the end of the reporting period, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants.

At the end of the reporting period, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦1,474,009 million (2017: ￦622,059 million).

21. Lease

The Group’s non-cancellable lease arrangements as at December 31, 2018, are as follows:

Details of finance lease assets as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Acquisition costs	￦	325,975		￦	343,055
Less: Accumulated depreciation		(126,091	)		(152,244	)
Net balance	￦	199,884		￦	190,811

As at December 31, 2018, the Group recognized financial lease assets as other property and equipment. The related depreciation amounted to ￦63,070 million for the year ended December 31, 2018 (for the year ended December 31, 2017: ￦58,535 million).

Details of future minimum lease payments as at December 31, 2017 and 2018, under finance lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Total amount of minimum lease payments
Within one year	￦	88,441	￦	77,615
From one year to five years		132,113		124,498
More than five years		81		79
		220,635		202,192
Unrealized interest expense		43,758		38,334
Net amount of minimum lease payments
Within one year		68,651		59,324
From one year to five years		108,146		104,456
More than five years		80		78
Total	￦	176,877	￦	163,858

F-63

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of future minimum lease payments as at December 31, 2017 and 2018, under operating lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Within one year	￦	109,258	￦	109,025
From one year to five years		266,434		263,395
Thereafter		1,635		1,153
Total	￦	377,327	￦	373,573

Operating lease expenses incurred for the years ended December 31, 2017 and 2018, amounted to ￦126,250 million and ￦132,225 million, respectively.

22. Share Capital

As at December 31, 2017 and 2018, the Group’s number of authorized shares is one billion.

December 31, 2017

December 31, 2018

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Ordinary shares1

261,111,808

￦

5,000

￦

1,564,499

261,111,808

￦

5,000

￦

1,564,499

1 The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

23. Retained Earnings

Details of retained earnings as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		4,527,539		5,822,458
Total	￦	9,961,150	￦	11,256,069

1 The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends, but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders.

2 The provision of research and development of human resources is separately accumulated with tax reserve fund during earned surplus disposal by Tax Reduction and Exemption Control Act of Korea. Reversal of this provision can be paid out as dividends according to related tax law.

F-64

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

24. Accumulated Other Comprehensive Income and Other Components of Equity

As at December 31, 2017 and 2018, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Changes in investments in associates and joint ventures	￦	(735	)	￦	(871	)
Loss on derivatives valuation		(3,463	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		—			96,704
Gain of valuation on available-for-sale		52,673			—
Exchange differences on translation for foreign operations		(17,490	)		(15,201	)
Total	￦	30,985		￦	50,158

Changes in accumulated other comprehensive income for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning			Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(10,883	)	￦	10,148		￦	—		￦	(735	)
Gain or loss on derivatives valuation		(34,309	)		(111,083	)		141,929			(3,463	)
Gain or loss of valuation on available-for-sale		54,106			54,017			(55,450	)		52,673
Exchange differences on translation for foreign operations		(10,346	)		(7,144	)		—			(17,490	)
Total	￦	(1,432	)	￦	(54,062	)	￦	86,479		￦	30,985

	2018
(In millions of Korean won)	Beginning			Changes in accounting policy		Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(735	)	￦	—	￦	(136	)	￦	—		￦	(871	)
Gain or loss on derivatives valuation		(3,463	)		—		17,268			(44,279	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		52,673			17,741		26,290			—			96,704
Exchange differences on translation for foreign operations		(17,490	)		—		2,289			—			(15,201	)
Total	￦	30,985		￦	17,741	￦	45,711		￦	(44,279	)	￦	50,158

F-65

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The Group’s other components of equity as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Treasury stock1	￦	(853,108	)	￦	(830,874	)
Gain or loss on disposal of treasury stock2		873			(12,251	)
Share-based payments		6,483			5,956
Others3		(359,550	)		(343,914	)
Total	￦	(1,205,302	)	￦	(1,181,083	)

1 During the year ended December 31, 2018, the Group acquired treasury stock of 847,620 and disposed of 895,333 treasury shares.

2 The amount directly reflected in equity is ￦5,410 million (2017: ￦653 million) for the year ended December 31, 2018.

3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included.

As at December 31, 2017 and 2018, the details of treasury stock are as follows:

	December 31, 2017		December 31, 2018
Number of shares (in shares)		16,014,753		15,967,040
Amounts (In millions of Korean won)	￦	853,108	￦	830,874

Treasury stock is expected to be used for the stock compensation for the Group’s directors and employees and other purposes.

25. Share-based Payments

Details of share-based payments as at December 31, 2018, are as follows:

	12th grant
Grant date	August 2, 2018
Grantee	CEOs, inside directors, outside directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦28,350
Total compensation costs (in Korean won)	￦5,956 million
Estimated exercise date (exercise date)	During 2019
Valuation method	Fair value method

Changes in the number of stock options and the weighted-average exercise price as at December 31, 2017 and 2018, are as follows:

	2017
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
10th grant		318,506		—		193,094		125,412		—		—
11th grant		—		316,949		—		—		316,949		—
Total		318,506		316,949		193,094		125,412		316,949		—

F-66

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

	2018
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
11th grant		316,949		—		312,181		4,768		—		—
12th grant		—		353,325		—		—		353,325		—
Total		316,949		353,325		312,181		4,768		353,325		—

1 The closing price of ordinary shares at the time of exercise in 2018 was ￦27,300 (2017: ￦31,797).

26. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

The Group has recognized the following amounts relating to revenue in the statement of profit or loss:

(In millions of Korean won)	2018
Revenue from contracts with customers	￦	23,012,257
Revenue from other sources		423,793
Total revenue	￦	23,436,050

Operating revenues for the years ended December 31, 2018, are as follows:

(In millions of Korean won)	2018
Mobile services	￦	6,827,685
Fixed-line services:		4,869,253
Fixed-line and VoIP telephone services		1,708,319
Broadband Internet access services		2,112,763
Data communication services		1,048,171
Media and content		3,182,324
Financial services		3,444,917
Sale of goods		3,288,911
Others		1,822,960
Total	￦	23,436,050

Mobile and fixed-line service

Telecommunication service revenues include mobile and fixed-line(e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that is considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees).

Media and content services

Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading.

F-67

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Media and contents services revenue are recognized when services are provided, based upon either usage or period of time.

Financial services

Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed.

Sale of goods

Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers.

The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract assets	￦	421,131	￦	398,797
Contract liabilities		282,836		347,461
Deferred revenue		88,732		96,198

The contract costs recognized as assets are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract costs recognized as assets	￦	1,306,409	￦	1,469,855

The Group recognized ￦1,397,318 million of operating expenses in the current reporting period which relates to contract cost assets.

In 2018, the recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905
Deferred revenue of joining/installment fee		39,975
Others		1,536
Total	￦	225,416

F-68

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

27. Operating Expenses

Operating expenses for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017			2018
Salaries and wages	￦	3,477,596	￦	3,568,456		￦	3,845,842
Depreciation		2,762,773		2,745,969			2,674,205
Amortization of intangible assets		582,493		618,533			607,527
Commissions		1,099,429		1,085,865			1,080,168
Interconnection charges		690,285		640,612			579,613
International interconnection fee		216,633		214,058			226,627
Purchase of inventories		3,407,263		4,053,693			4,414,094
Changes of inventories		162,323		(187,439	)		(432,607	)
Sales commission		1,968,035		2,201,778			1,942,841
Service cost		1,322,337		1,428,405			1,540,869
Utilities		323,406		323,313			323,411
Taxes and dues		255,480		279,574			285,131
Rent		455,457		448,772			460,377
Insurance premium		178,231		69,384			73,654
Installation fee		156,669		146,783			143,669
Advertising expenses		185,560		197,114			157,675
Research and development expenses		167,881		168,635			176,758
Card service cost		3,049,559		3,094,894			3,112,618
Others		1,319,688		1,379,438			1,122,718
Total	￦	21,781,098	￦	22,477,837		￦	22,335,190

Details of employee benefits for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Short-term employee benefits	￦	3,206,904	￦	3,297,944	￦	3,505,214
Post-employment benefits(Defined benefit plan)		208,942		209,770		232,045
Post-employment benefits(Defined contribution plan)		46,023		45,936		48,210
Post-employment benefits(Others)		8,017		6,949		51,934
Share-based payment		7,710		7,660		8,439
Total	￦	3,477,596	￦	3,568,259	￦	3,845,842

F-69

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

28. Financial Income and Costs

Details of financial income for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest income	￦	115,686	￦	93,078	￦	244,796
Gain on foreign currency transactions		24,915		79,653		17,175
Gain on foreign currency translation		12,165		225,580		3,691
Gain on settlement of derivatives		8,515		—		27,950
Gain on valuation of derivatives		109,436		57		66,305
Others		25,422		7,960		14,326
Total	￦	296,139	￦	406,328	￦	374,243

Details of financial costs for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest expenses	￦	337,219	￦	302,464	￦	296,874
Loss on foreign currency transactions		37,936		40,303		49,156
Loss on foreign currency translation		121,949		12,239		72,642
Loss on settlement of derivatives		632		58,569		—
Loss on valuation of derivatives		138		209,582		2,045
Loss on disposal of trade receivables		15,838		20,355		13,818
Impairment loss on available-for-sale financial assets		966		9		—
Others		409		1,010		1,124
Total	￦	515,087	￦	644,531	￦	435,659

29. Deferred Income Tax and income Tax Expense

The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	318,339		￦	428,690
Deferred tax assets to be recovered after more than 12 months		1,140,252			1,347,985
Deferred tax assets before offsetting		1,458,591			1,776,675
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(15,705	)		(413,409	)
Deferred tax liability to be recovered after more than 12 months		(859,126	)		(1,102,682	)
Deferred tax liabilities before offsetting		(874,831	)		(1,516,091	)
Deferred tax assets after offsetting	￦	712,222		￦	465,369
Deferred tax liabilities after offsetting	￦	128,462		￦	204,785

F-70

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The gross movements on the deferred income tax account for the years ended December 31, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	563,729		￦	583,760
Changes in accounting policy		—			(374,307	)
Credited to the statement of profit or loss		(1,771	)		15,016
Charged to other comprehensive income		21,802			36,115
Ending	￦	583,760		￦	260,584

The movement in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdiction, is as follows:

(In millions of Korean won)	2017
	Beginning			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments	￦	(49,188	)	￦	49,188		￦	—		￦	—
Available-for-sale financial assets		(31,702	)		(164	)		1,346			(30,520	)
Investment in subsidiaries, associates, and joint ventures		(50,746	)		(42,659	)		(3,245	)		(96,650	)
Depreciation		(39,498	)		39,498			—			—
Advanced depreciation provision		(225,687	)		(22,905	)		—			(248,592	)
Deposits for severance benefits		(307,730	)		(80,126	)		—			(387,856	)
Accrued income		(2,024	)		(126	)		—			(2,150	)
Reserve for technology and human resource development		(747	)		433			—			(314	)
Others		(119,366	)		10,617			—			(108,749	)
Total	￦	(826,688	)	￦	(46,244	)	￦	(1,899	)	￦	(874,831	)
Deferred tax assets
Derivative instruments	￦	—		￦	34,572		￦	(9,848	)	￦	24,724
Provision for impairment or trade receivables		110,276			11,380			—			121,656
Inventory valuation		48			(48	)		—			—
Contribution for construction		18,091			180			—			18,271
Accrued expenses		80,356			10,683			—			91,039
Provisions		20,221			3,858			—			24,079
Property and equipment		232,915			(841	)		—			232,074
Defined benefit liabilities		372,492			67,751			26,806			467,049
Withholding of facilities expenses		6,910			472			—			7,382
Accrued payroll expenses		25,915			(10,786	)		—			15,129
Deduction of installment receivables		13,887			(13,887	)		—			—
Assets retirement obligation		18,086			2,750			—			20,836
Gain or loss foreign currency translation		67,701			(67,558	)		—			143
Deferred revenue		26,113			221			—			26,334
Real-estate sales		3,851			4,847			—			8,698

F-71

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2017
	Beginning		Statement of profit or loss			Other comprehensive income		Ending
Tax credit carryforwards		199,599		(48,823	)		—		150,776
Tax loss carryforward		—		2,699			—		2,699
Others		193,956		47,003			6,743		247,702
Total	￦	1,390,417	￦	44,473		￦	23,701	￦	1,458,591
Net balance	￦	563,729	￦	(1,771	)	￦	21,802	￦	583,760

(In millions of Korean won)	2018
	Beginning			Changes in accounting policy			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Available-for-sale financial assets	￦	(30,520	)	￦	30,520		￦	—		￦	—		￦	—
Investment in subsidiaries, associates, and joint ventures		(96,650	)		—			2,867			179			(93,604	)
Depreciation		—			—			(424	)		—			(424	)
Advanced depreciation provision		(248,592	)		—			(64,592	)		—			(313,184	)
Deposits for severance benefits		(387,856	)		—			(11,126	)		—			(398,982	)
Accrued income		(2,150	)		—			592			—			(1,558	)
Reserve for technology and human resource development		(314	)		—			110			—			(204	)
Prepaid expenses		—			(352,139	)		(17,777	)		—			(369,916	)
Contract assets		—			(23,663	)		12,158			—			(11,505	)
Financial assets at fair value through profit or loss		—			(30,856	)		30,195			—			(661	)
Financial assets at fair value through other comprehensive income		—			(8,587	)		(17,638	)		(15,573	)		(41,798	)
Others		(108,749	)		—			(175,506	)		—			(284,255	)
Total	￦	(874,831	)	￦	(384,725	)	￦	(241,141	)	￦	(15,394	)	￦	(1,516,091	)
Deferred tax assets
Derivative instruments	￦	24,724		￦	—		￦	(26,128	)	￦	9,745		￦	8,341
Provision for impairment or trade receivables		121,656			(9,096	)		(12,673	)		—			99,887
Inventory valuation		—			—			121			—			121
Contribution for construction		18,271			—			(1,471	)		—			16,800
Unsettled expenses		106,168			—			21,729			—			127,897
Provisions		24,079			—			12,099			—			36,178
Property and equipment		232,074			—			(1,796	)		—			230,278
Defined benefit liabilities		467,049			—			3,980			42,813			513,842

F-72

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2018
	Beginning		Changes in accounting policy			Statement of profit or loss			Other comprehensive income			Ending
Withholding of facilities expenses		7,382		—			(773	)		—			6,609
Deduction of installment receivables		—		—			42			—			42
Assets retirement obligation		20,836		—			3,696			—			24,532
Gain or loss foreign currency translation		143		—			10,529			—			10,672
Deferred revenue		26,334		15,809			(2,502	)		—			39,641
Real-estate sales		8,698		661			12,369			—			21,728
Tax loss carryforward		2,699		—			1,364			—			4,063
Trade receivables		—		2,890			(1,293	)		—			1,597
Others		247,702		154			284,742			(1,049	)		531,549
Total	￦	1,307,815	￦	10,418		￦	304,035		￦	51,509		￦	1,673,777
Temporary difference, net		432,984		(374,307	)		62,894			36,115			157,686
Tax credit carryforwards		150,776		—			(47,878	)		—			102,898
Total net balance	￦	583,760	￦	(374,307	)	￦	15,016		￦	36,115		￦	260,584

The tax impacts recognized directly to equity as at December 31, 2016, 2017, and 2018, are as follows:

	2016									2017									2018
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Loss on valuation of available-for-sale securities	￦	9,347		￦	(2,262	)	￦	7,085		￦	(5,561	)	￦	1,346		￦	(4,215	)	￦	—		￦	—		￦	—
Gain on valuation of financial assets at fair value through other comprehensive income		—			—			—			—			—			—			59,384			(15,573	)		43,811
Gain (loss) on valuation of hedge instruments		(14,611	)		3,536			(11,075	)		40,694			(9,848	)		30,846			(36,756	)		9,745			(27,011	)
Remeasurements of net defined benefit liabilities		5,558			(1,345	)		4,213			(110,768	)		26,806			(83,962	)		(116,324	)		42,813			(73,511	)
Share of gain(loss) of associates and joint ventures, and others		(641	)		155			(486	)		13,410			(3,245	)		10,165			(1,036	)		179			(857	)
Exchange differences on translation for foreign operations		(7,133	)		1,726			(5,407	)		(27,865	)		6,743			(21,122	)		3,989			(1,049	)		2,940
Total	￦	(7,480	)	￦	1,810		￦	(5,670	)	￦	(90,090	)	￦	21,802		￦	(68,288	)	￦	(90,743	)	￦	36,115		￦	(54,628	)

F-73

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of income tax expense for the years ended December 31, 2016, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2016		2017		2018
Current income tax expense	￦	182,088	￦	268,885	￦	329,581
Impact of change in deferred taxes		152,102		1,771		(15,016	)
Income tax expense	￦	334,910	￦	270,656	￦	314,565

The tax on the Group’s profit before tax differs from the theoretical amount that would arise using the weighted average tax rate applicable to profits of the entities as follows:

(In millions of Korean won)	2016			2017			2018
Profit before income tax expense	￦	1,166,755		￦	816,997		￦	1,033,977
Statutory income tax expense	￦	282,355		￦	197,251		￦	273,982
Tax effect
Income not taxable for taxation purposes		(28,093	)		(19,268	)		(85,322	)
Non-deductible expenses		21,947			39,746			18,126
Tax credit		(13,764	)		(27,211	)		(20,319	)
Additional payment of income taxes		(4,780	)		976			11,439
Tax effect and adjustment on consolidation
Goodwill impairment		31,847			20,475			137
Eliminated dividend income form subsidiaries		40,087			34,305			31,966
Changes of out-side tax effect		(567	)		17,990			618
Investment in-kind		—			—			82,820
Others		5,878			6,392			1,118
Income tax expense	￦	334,910		￦	270,656		￦	314,565

30. Earnings per Share

Basic earnings per share is calculated by dividing the profit from operations attributable to equity holders of the Group by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares purchased by the Group and held as treasury stock.

Basic earnings per share from operations for the years ended December 31, 2016, 2017 and 2018, is calculated as follows:

	2016		2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090	￦	461,559	￦	645,571
Weighted average number of ordinary shares outstanding (In number of shares)		244,892,313		245,017,175		245,049,466
Basic earnings per share (In Korean won)		3,043		1,884		2,634

Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding to assume conversion of all dilutive potential ordinary shares. The Controlling Company has dilutive potential ordinary shares from convertible preferred stocks, stock options and other share-based payments.

F-74

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Diluted earnings per share from operations for the years ended December 31, 2016, 2017 and 2018 is calculated as follows:

	2016			2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090		￦	461,559	￦	645,571
Adjusted net income attributable to ordinary shares (In millions of Korean won)		(67	)		—		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		745,023			461,559		645,571
Number of dilutive potential ordinary shares outstanding (In number of shares)		84,245			79,880		1,163
Weighted average number of ordinary shares outstanding (In number of shares)		244,976,558			245,097,055		245,050,629
Diluted earnings per share (In Korean won)		3,041			1,883		2,634

31. Dividend

The dividends paid by the Group in 2018, 2017 and 2016 were ￦245,097 million (￦1,000 per share), ￦195,977 million (￦800 per share) and ￦122,425 million (￦500 per share), respectively. A dividend in respect of the year ended December 31, 2018, of ￦1,100 per share, amounting to a total dividend of ￦269,659 million, was approved at the shareholders’ meeting on March 29, 2019.

32. Cash Generated from Operations

Cash flows from operating activities for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
1. Profit for the year	￦	831,845		￦	546,341		￦	719,412
2. Adjustments to reconcile net income
Income tax expense		334,910			270,656			314,565
Interest income1		(130,066	)		(108,639	)		(265,817	)
Interest expense1		337,219			302,464			296,894
Dividends income		(3,926	)		(4,785	)		(2,910	)
Depreciation		2,821,779			2,802,531			2,735,413
Amortization of intangible assets		599,721			635,150			629,526
Provision for severance benefits		217,255			218,966			245,926
Impairment losses on trade receivables		92,711			45,704			113,064
Share of net profit or loss of associates and joint ventures		(2,547	)		15,480			5,912
Loss(gain) on disposal of associates and joint ventures		(1,450	)		979			(3,737	)
Impairment loss of associates and joint ventures		17,128			3,662			—
Loss on disposal of property and equipment and investment in properties		74,913			150,293			68,688
Loss(gain) on disposal of intangible assets		7,703			4,271			(4,256	)
Loss on impairment of intangible assets		135,264			116,095			12,997

F-75

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2016			2017			2018
Loss on foreign currency translation		109,784			(213,341	)		68,952
Loss(gain) on valuation and settlement of derivatives, net		(117,181	)		268,094			(92,210	)
Gain on disposal of financial assets at fair value through profit or loss		—			—			(1,712	)
Gain on valuation of financial assets at fair value through profit or loss		—			—			(10,768	)
Gain on disposal of financial assets at amortized cost		—			—			(44	)
Impairment losses on available-for-sale financial assets		966			9			—
Gain on disposal of available-for-sale financial assets		(22,695	)		(89,598	)		—
Others		64,863			(251,193	)		(55,969	)
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		216,818			(303,340	)		(81,217	)
Decrease(increase) in other receivables		(779,803	)		(346,013	)		356,643
Decrease(increase) in other current assets		48,549			11,792			(123,258	)
Decrease(increase) in other non-current assets		(51,765	)		(43,790	)		19,556
Decrease(increase) in inventories		167,873			(205,403	)		(480,543	)
Increase(decrease) in trade payables		(114,838	)		162,110			(167,841	)
Increase(decrease) in other payables		706,771			214,689			(448,301	)
Increase in other current liabilities		37,798			288,553			291,548
Increase in other non-current liabilities		30,762			174,618			144,072
Decrease(Increase) in provisions		(12,583	)		(12,574	)		85,946
Decrease(Increase) in deferred revenue		(69,179	)		(13,086	)		48,201
Increase in plan assets		(224,244	)		(203,420	)		(53,301	)
Payment of severance benefits		(121,835	)		(118,391	)		(153,209	)
4. Cash generated from operations (1+2+3)	￦	5,202,520		￦	4,318,884		￦	4,212,222

1 BC Card Co., Ltd. and other subsidiaries of the Group recognized interest income and expenses as operating income and expenses, respectively. Related interest income recognized as operating revenue is ￦21,021 million (2017: ￦15,561 million) and related interest expense recognized as operating expense is ￦21 million (2017: zero) for the year ended December 31, 2018.

The Group made agreements with securitization specialty companies and disposed of its trade receivables related to handset sales (Note 20). Cash flows from the disposals are presented in cash generated from operations.

F-76

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Significant transactions not affecting cash flows for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Reclassification of the current portion of borrowings	￦	1,617,175		￦	1,416,066		￦	1,149,599
Reclassification of construction-in-progress to property and equipment		2,212,324			2,686,591			1,988,014
Reclassification of accounts payable from property and equipment		91,407			225,601			122,185
Reclassification of accounts payable from intangible assets		668,564			(227,108	)		584,595
Reclassification of payable from defined benefit liability		5,746			36,209			(31,838	)
Reclassification of payable from plan assets		(9,731	)		43,035			(9,497	)

33. Changes in Liabilities Arising from Financing Activities

Changes in liabilities arising from financial activities for the periods ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	8,120,791		￦	(1,163,917	)	￦	—	￦	(221,495	)	￦	—		￦	(2,206	)	￦	(49,511	)	￦	6,683,662
Financial lease liabilities		180,714			(71,735	)		68,938		—			—			—			(1,039	)		176,878
Derivative liabilities		16,901			—			—		130,674			(28,015	)		—			(20,740	)		98,820
Derivative assets		(227,318	)		71,370			—		76,552			(2,687	)		—			74,694			(7,389	)
Total	￦	8,091,088		￦	(1,164,282	)	￦	68,938	￦	(14,269	)	￦	(30,702	)	￦	(2,206	)	￦	3,404		￦	6,951,971
(In millions of Korean won)	2018
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	6,683,662		￦	(139,715	)	￦	—	￦	70,095		￦	—		￦	15,000		￦	19,252		￦	6,648,294
Financial lease liabilities		176,878			(73,885	)		61,187		—			—			—			(322	)		163,858
Derivative liabilities		98,820			(14,587	)		—		(37,344	)		35,809			—			(17,631	)		65,067
Derivative assets		(7,389	)		11,126			—		(22,474	)		(3,419	)		—			(7,687	)		(29,843	)
Total	￦	6,951,971		￦	(217,061	)	￦	61,187	￦	10,277		￦	32,390		￦	15,000		￦	(6,388	)	￦	6,847,376

34. Segment Information

The Group’s operating segments are as follows:

Details	Business service
Marketing/Customer	Mobile/fixed line telecommunication service and convergence business
Corporate customer business	B2B business and others
Finance	Credit card business and others
Satellite TV	Satellite TV business
Others	IT, facility security and global business, and others

F-77

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of each segment for the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016
(In millions of Korean won)	Operating revenues			Operating income			Depreciation and Amortization
Marketing/Customer	￦	16,187,739		￦	1,093,377		￦	2,870,161
Finance		3,577,549			208,566			28,868
Satellite TV		668,945			79,987			98,895
Others		6,308,203			40,047			339,429
		26,742,436			1,421,977			3,337,353
Elimination		(3,578,234	)		(38,873	)		7,913
Consolidated amount	￦	23,164,202		￦	1,383,104		￦	3,345,266

	2017
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	16,242,552		￦	1,018,593		￦	2,895,930
Finance		3,637,917			205,678			28,827
Satellite TV		685,822			75,373			99,216
Others		6,651,552			(187,090	)		332,153
		27,217,843			1,112,554			3,356,126
Elimination		(3,670,914	)		(43,462	)		8,376
Consolidated amount	￦	23,546,929		￦	1,069,092		￦	3,364,502

	2018
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	14,061,629		￦	886,515		￦	2,293,809
Corporate customer business1		2,509,880			208,584			546,635
Finance		3,560,417			145,463			22,504
Satellite TV		690,821			66,735			98,310
Others		6,349,546			(154,130	)		313,511
		27,172,293			1,153,167			3,274,769
Elimination		(3,736,243	)		(52,307	)		6,963
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 The reporting segment of the current period has changed. However, the reporting segment of the prior period has not been restated to reflect the change.

F-78

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Operating revenues for the year ended December 31, 2016, 2017 and 2018 and non-current assets as at December 31, 2017 and 2018 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues			Non-current assets1
Location	2016	2017	2018	2017.12.31	2018.12.31
Domestic	￦23,069,579	￦23,481,703	￦23,376,218	￦17,246,640	￦17,426,879
Overseas	94,623	65,226	59,832	137,914	139,585
Total	￦23,164,202	￦23,546,929	￦23,436,050	￦17,384,554	￦17,566,464

1 Non-current assets include property, plant and equipment, intangible assets and investment properties.

35. Related Party Transactions

The list of related party of the Group as at December 31, 2018, is as follows:

Relationship

Name of Entry

Associates and joint ventures

Korea Information & Technology Investment Fund, K- Realty CR-REITs No.1, KT-SB Venture Investment Fund, Boston Global Film & Contents Fund L.P., QTT Global (Group) Company Limited, CU Industrial Development Co., Ltd., PHI Healthcare. (HooH Healthcare Inc.), KD Living, Inc., Oscar Ent. Co., Ltd., KT-CKP New Media Investment Fund, LoginD Co., Ltd., K-REALTY CR-REIT 6, K Bank, Inc., ISU-kth Contents Investment Fund, Daiwon Broadcasting Co., Ltd., KT-DSC creative economy youth start-up investment fund, Gyeonggi-KT Green Growth Fund, Korea electronic Vehicle charging service, PT. Mitra Transaksi Indonesia, K-REALTY RENTAL HOUSING REIT 2, AI RESEARCH INSTITUTE, KT-IBKC Future Investment Fund 1, Gyeonggi-KT Yoojin Superman Fund, FUNDA Co., Ltd., FUNDA Co., Ltd., CHAMP IT Co., Ltd., GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company, Alliance Internet Corp., JB Emerging Market Specialty Investment Private Equity Trust No.1, Little big pictures.

F-79

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2017 and 2018, are as follows:

		December 31, 2017
		Receivables						Payables
(In millions of Korean won)		Trade receivables		Loans		Other receivables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	778	￦	—	￦	33,800	￦	—
	MOS GS Co., Ltd.		17		—		—		392
	MOS Daegu Co., Ltd.		1		—		—		1,388
	MOS Chungcheong Co., Ltd.		1		—		290		1,827
	MOS Gangnam Co., Ltd.		6		—		1		287
	MOS GB Co., Ltd.		17		—		1		778
	MOS BS Co., Ltd.		34		—		1		46
	MOS Honam Co., Ltd.		2		—		1		384
	K Bank, Inc.		1,338		—		7,994		296
	NgeneBio		1		2,510		—		3
	Others		54		—		1,281		2,135
	Total	￦	2,249	￦	2,510	￦	43,369	￦	7,536

		December 31, 2018
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Trade payables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	674	￦	30,910	￦	—	￦	—
	K Bank, Inc.		627		12,435		—		296
	Others		777		1,225		4		1,116
	Total	￦	2,078	￦	44,570	￦	4	￦	1,412

Significant transactions with related parties for the years ended December 31, 2016, 2017 and 2018, are as follows:

		2016
(In millions of Korean won)		Sales		Purchases2
Associates and joint ventures	KT Wibro Infra Co., Ltd.	￦	11	￦	391
	Smart Channel Co., Ltd.1		766		—
	K- Realty CR-REITs No.1		1,989		37,469
	MOS GS Co., Ltd.		663		17,361
	MOS Daegu Co., Ltd.		291		12,220
	MOS Chungcheong Co., Ltd.		408		13,469
	MOS Gangnam Co., Ltd.		412		15,797
	MOS GB Co., Ltd.		891		21,802
	MOS BS Co., Ltd.		441		15,346
	MOS Honam Co., Ltd.		418		14,389
	Others		1,719		29,422
	Total	￦	8,009	￦	177,666

F-80

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 The transactions for the year ended December 31, 2016, before Smart Channel Co., Ltd. was included in the consolidation scope.

2 Amounts include acquisition of primarily property and equipment.

		2017
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,233	￦	35,532
	MOS GS Co., Ltd.		704		16,946
	MOS Daegu Co., Ltd.		335		8,514
	MOS Chungcheong Co., Ltd.		455		15,542
	MOS Gangnam Co., Ltd.		484		16,380
	MOS GB Co., Ltd.		987		21,651
	MOS BS Co., Ltd.		460		15,957
	MOS Honam Co., Ltd.		493		14,294
	K Bank, Inc.		29,939		59
	NgeneBio2		43		—
	Others		1,149		11,384
	Total	￦	37,282	￦	156,259

1 The amount includes acquisition of primarily property and equipment.

2 It is the amount after excluded from consolidation during the year.

		2018
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,088	￦	31,984
	MOS GS Co., Ltd.2		493		12,023
	MOS Daegu Co., Ltd.2		229		8,775
	MOS Chungcheong Co., Ltd.2		540		9,159
	MOS Gangnam Co., Ltd.2		333		11,549
	MOS GB Co., Ltd.2		1,378		16,519
	MOS BS Co., Ltd.2		324		11,193
	MOS Honam Co., Ltd.2		331		10,499
	K Bank, Inc.		15,705		7,004
	NgeneBio3		3		—
	Others		2,888		9,547
	Total	￦	24,312	￦	128,252

1 Amounts include acquisition of primarily property and equipment.

2 It is the amount before excluded from consolidation during the year.

3 It is the amount before excluded from associates during the year

F-81

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Key management compensation for the years ended December 31, 2016, 2017 and 2018, consists of:

(In millions of Korean won)	2016		2017		2018
Salaries and other short-term benefits	￦	2,629	￦	2,879	￦	2,762
Post-employment benefits		381		311		751
Stock-based compensation		1,237		1,331		878
Total	￦	4,247	￦	4,521	￦	4,391

Fund transactions with related parties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Equity contributions in cash		Dividend income
Associates and joint ventures
PT. Mitra Transaksi Indonesia	￦	5,194	￦	—
KT-IBKC future investment fund 1		7,500		—
CHAMP IT Co., Ltd.		750		—
Korea Electronic Vehicle Charging Service		864		—
Gyeonggi-KT Yoojin Superman Fund		1,000		—
K-REALTY CR REIT 1		—		5,392
K Bank, Inc.		26,543		—
Korea Information & Technology Investment Fund		—		739
MOS GS Co., Ltd.		—		12
MOS Daegu Co., Ltd.		—		12
MOS Chungcheong Co., Ltd.		—		12
MOS Gangnam Co., Ltd.		—		10
MOS GB Co., Ltd.		—		15
MOS BS Co., Ltd.		—		10
MOS Honam Co., Ltd.		—		10
Total	￦	41,851	￦	6,212

F-82

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	2018
	Equity contributions in cash and others			Dividend income
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000		￦	—
KT-CKP New Media Investment Fund		(1,229	)		—
PT. Mitra Transaksi Indonesia1		1,567			—
Gyeonggi-KT Yoojin Superman Fund		1,000			—
KT-DSC creative economy youth start-up investment fund		(1,800	)		—
KT-IBKC future investment fund 1		(1,050	)		—
Korea Electronic Vehicle Charging Service		168			—
K Bank, Inc.		26,725			—
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company		(3,423	)		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		3,960			202
K-REALTY CR REIT 1		—			8,932
Korea Information & Technology Investment Fund		—			1,842
MOS GS Co., Ltd.2		(147	)		8
MOS Daegu Co., Ltd.2		(147	)		8
MOS Chungcheong Co., Ltd.2		(153	)		8
MOS Gangnam Co., Ltd.2		(180	)		10
MOS GB Co., Ltd.2		(203	)		12
MOS BS Co., Ltd.2		(183	)		10
MOS Honam Co., Ltd.2		(206	)		10
Daiwon Broadcasting Co., Ltd.		—			85
Boston Global Film & Contents Fund L.P.		(986	)		—
Gyeonggi-KT Green Growth Fund		—			19
Total	￦	24,713		￦	11,146

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

36. Financial Risk Management

(1) Financial Risk Factors

The Group’s activities expose it to a variety of financial risks: market risk (including currency risk, fair value interest rate risk, cash flow interest rate risk and price risk), credit risk and liquidity risk. The Group’s overall risk management program focuses on the unpredictability of financial markets and seeks to minimize potential adverse effects on the Group’s financial performance. The Group uses derivative financial instruments to hedge certain risk exposures such as cash flow risk.

The Group’s financial policy is set up in the long-term perspective and annually reported to the Board of Directors. The financial risk management is carried out by the Value Management Office, which identifies, evaluates and hedges financial risks. The treasury department in the Value Management Office considers various finance market conditions to estimate the effect from the market changes.

F-83

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1) Market risk

The Group’s market risk management focuses on controlling the extent of exposure to the risk in order to minimize revenue volatility. Market risk is a risk that decreases value or profit of the Group’s portfolio due to changes in market interest rate, foreign exchange rate and other factors.

(i) Sensitivity analysis

Sensitivity analysis is performed for each type of market risk to which the Group is exposed. Reasonably possible changes in the relevant risk variable such as prevailing market interest rates, currency rates, equity prices or commodity prices are estimated and if the rate of change in the underlying risk variable is stable, the Group does not alter the chosen reasonably possible change in the risk variable. The reasonably possible change does not include remote or ‘worst case’ scenarios or ‘stress tests’.

(ii) Foreign exchange risk

The Group is exposed to foreign exchange risk arising from operating, investing and financing activities. Foreign exchange risk is managed within the range of the possible effect on the Group’s cash flows. Foreign exchange risk (i.e. foreign currency translation of overseas operating assets and liabilities) unaffecting the Group’s cash flows is not hedged but can be hedged at a particular situation.

As at December 31, 2016, 2017 and 2018, if the foreign exchange rate had strengthened/weakened by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of foreign exchange rate			Income before tax1			Shareholders’ equity
2016.12.31		10	%		(28,134	)		(23,817	)
		-10	%		28,134			23,817
2017.12.31		10	%		(10,132	)		(7,273	)
		-10	%		10,132			7,273
2018.12.31		10	%		(2,350	)		633
		-10	%		(2,851	)		(62	)

1 Computed with considering derivatives hedging effect applied by the Group to hedge foreign exchange risk of liabilities in foreign currencies

The above analysis is a simple sensitivity analysis which assumes that all the variables other than foreign exchange rates are held constant. Therefore, the analysis does not reflect any correlation between foreign exchange rates and other variables, nor the management’s decision to decrease the risk.

F-84

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Details of financial assets and liabilities in foreign currencies as at December 31, 2016, 2017 and 2018, are as follows:

(In thousands of foreign currencies)	2016				2017				2018
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		210,474		2,536,090		236,476		1,908,831		279,327		1,893,782
SDR1		311		737		306		738		267		730
JPY		80,555		21,802,051		28,267		21,801,443		66,078		50,000,000
GBP		1		151		—		74		—		256
EUR		40		2,571		186		3,625		2		6
DZD2		471		—		47		—		618		—
CNY		15,262		381		46,555		10		16,315		271
UZS3		39,531		—		136,787		—		121,053		—
RWF4		1,203		—		3,346		—		857		—
THB5		—		—		—		—		1,685		1,685
IDR6		15,646,011		53,142,167		14,886,393		710,162		64,240,286		41,510,330
MMK7		2,750		—		84		—		84		—
TZS8		29,987		—		317,348		—		—		2,876
BWP9		15		—		42		—		897		—
HKD		254		—		—		—		—		—
BDT10		69,473		—		38,074		—		39,494		—
PLN11		106,025		—		338		—		26		—
VND12		515,412		—		311,649		—		467,272		—
XAF13		—		—		—		—		666		—
CHF14		—		—		—		12		—		—

1 Special Drawing Rights.

2 Algeria Dinar.

3 Uzbekistan Sum.

4 Rwanda Franc.

5 Thailand Bhat.

6 Indonesia Rupiah.

7 Myanmar Kyat.

8 Tanzanian Shilling.

9 Botswana Pula.

10 Bangladesh Taka.

11 Polish Zloty.

12 Vietnam Dong.

13 Central African Franc.

14 Confoederatio Helvetia Franc.

F-85

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(iii) Price risk

As at December 31, 2016, 2017 and 2018, the Group is exposed to equity securities price risk because the securities held by the Group are traded in active markets. If the market prices had increased/decreased by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of price	Income before tax			Equity
2016.12.31	10%	￦	—		￦	539
	-10%		—			(539	)
2017.12.31	10%	￦	—		￦	686
	-10%		—			(686	)
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)

The above analysis is based on the assumption that the equity index had increased/decreased by 10% with all other variables held constant and all the Group’s marketable equity instruments had moved according to the historical correlation with the index. Gain or loss on equity securities classified as financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income can increase or decrease equity.

(iv) Cash flow and fair value interest rate risk

The Group’s interest rate risk arises from liabilities in foreign currency such as foreign currency debentures. Debentures in foreign currency issued at variable rates expose the Group to cash flow interest rate risk which is partially offset by swap transactions. Debentures and borrowings issued at fixed rates expose the Group to fair value interest rate risk. The Group sets the policy and operates to minimize the uncertainty of the changes in interest rates and financial costs.

As at December 31, 2016, 2017 and 2018, if the market interest rate had increased/decreased by 100 bp with other variables held constant, the effects on profit before income tax and shareholders’ equity would be as follows:

(In millions of Korean won)	Fluctuation of interest rate	Income before tax			Shareholders’ equity
2016.12.31	+ 100 bp	￦	(3,456	)	￦	(1,673	)
	- 100 bp		3,445			(5,025	)
2017.12.31	+ 100 bp	￦	1,942		￦	4,868
	- 100 bp		(1,954	)		(5,198	)
2018.12.31	+ 100 bp	￦	1,059		￦	9,689
	- 100 bp		(1,958	)		(10,237	)

The above analysis is a simple sensitivity analysis which assumes that all the variables other than market interest rates are held constant. Therefore, the analysis does not reflect any correlation between market interest rates and other variables, nor the management’s decision to decrease the risk.

2) Credit risk

Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises principally from the Group’s trade receivables from customers, debt securities and others.

F-86

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

- Risk management

Credit risk is managed on the Group basis with the purpose of minimizing financial loss. Credit risk arises from the normal transactions and investing activities, where clients or other party fails to discharge an obligation on contract conditions. To manage credit risk, the Group considers the counterparty’s credit based on the counterparty’s financial conditions, default history and other important factors.

Credit risk arises from cash and cash equivalents, derivative financial instruments and deposits with banks and financial institutions, as well as outstanding receivables. To minimize such risk, only the financial institutions with strong credit ratings are accepted.

The Group’s investments in debt instruments are considered to be low risk investments. The credit ratings of the investments are monitored for credit deterioration.

- Security

For some trade receivables, the Group may obtain security in the form of guarantees or letters of credit, etc. which can be called upon if the counterparty is in default under the terms of the agreement.

- Impairment of financial assets

The Group has four types of financial assets that are subject to the expected credit loss model:

• trade receivables for sales of goods and provision of services,

• contract assets relating to provision of services,

• debt investments carried at fair value through other comprehensive income, and

• other financial assets carried at amortized cost.

While cash equivalents are also subject to the impairment requirement, the identified impairment loss was immaterial.

F-87

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

As at December 31, 2017 and 2018, maximum exposure to credit risk is as follows.

(In millions of Korean won)	December 31, 2017		December 31, 2018
Cash and cash equivalents (except for cash on hand)	￦	1,926,620	￦	2,284,885
Trade and other receivables
Financial assets at amortized costs		6,793,397		5,425,996
Financial assets at fair value through other comprehensive income		—		1,097,348
Contract assets		—		398,797
Other financial assets
Derivatives financial assets for hedging		7,389		29,843
Financial assets at fair value through profit or loss		5,813		714,653
Financial assets at fair value through other comprehensive income		—		6,909
Financial assets at amortized costs		—		484,271
Available-for-sale financial assets		9,899		—
Held-to-maturity financial assets		151		—
Financial instruments and others		1,333,317		—
Financial guarantee contracts1		143,969		65,760
Total	￦	10,220,555	￦	10,508,462

1 It is total amount guaranteed by the Group according to the guarantee contracts.

(i) Trade receivables and contract assets

The Group applies the simplified approach to measuring expected credit losses which uses a lifetime expected loss allowance for all trade receivables and contract assets.

(ii) Cash equivalents (except for cash on hand)

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through profit or loss. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

(iii) Other financial assets at amortized costs

Other financial assets at amortized cost include time deposits, other long-term financial instruments and others. All of the financial assets at amortized costs are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Management consider ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term.

(iv) Financial assets at fair value through other comprehensive income

Financial assets at fair value through other comprehensive income include available-for-sale recognized in the prior financial year.

F-88

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

All of the debt investments at fair value through other comprehensive income are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Management consider ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term.

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through other comprehensive income. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

(v) Financial assets at fair value through profit or loss

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through profit or loss. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

3) Liquidity risk

The Group manages its liquidity risk by liquidity strategy and plans. The Group considers the maturity of financial assets and financial liabilities and the estimated cash flows from operations.

The table below analyzes the Group’s liabilities (including interest expenses) into relevant maturity groups based on the remaining period at the date of the end of each reporting period to the contractual maturity date. These amounts are contractual undiscounted cash flows and can differ from the amount in the financial statements.

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,882,861	￦	1,219,835	￦	161,497	￦	9,264,193
Borrowings(including debentures)		1,623,996		3,666,726		2,317,209		7,607,931
Other non-derivative financial liabilities		4,117		31,290		142,706		178,113
Financial guarantee contracts1		26,738		—		—		26,738
Total	￦	9,537,712	￦	4,917,851	￦	2,621,412	￦	17,076,975

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,287,436	￦	1,173,579	￦	492,429	￦	8,953,444
Borrowings(including debentures)		1,507,232		3,669,060		2,378,272		7,554,564
Other non-derivative financial liabilities		6,123		37,358		132,152		175,633
Financial guarantee contracts1		52,734		13,026		—		65,760
Total	￦	8,853,525	￦	4,893,023	￦	3,002,853	￦	16,749,401

1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed.

F-89

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Cash outflow and inflow of derivatives settled gross or net are undiscounted contractual cash flow and can differ from the amount in the financial statements.

	December 31, 2016
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	1,174,147	￦	1,176,715	￦	536,005	￦	2,886,867
Inflow		1,302,112		1,306,199		588,559		3,196,870

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	638,171	￦	546,791	￦	526,633	￦	1,711,595
Inflow		608,270		568,976		509,558		1,686,804

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	455,343	￦	1,466,915	￦	517,301	￦	2,439,559
Inflow		484,505		1,492,718		519,133		2,496,356

(2) Management of Capital Risk

The Group’s objectives when managing capital are to safeguard the Group’s ability to continue as a going concern in order to provide returns for shareholders and benefits for other shareholders and to maintain an optimal capital structure to reduce the cost of capital.

The Group’s capital structure consists of liabilities including borrowings, cash and cash equivalents, and shareholders’ equity. The treasury department monitors the Group’s capital structure and considers cost of capital and risks related each capital component.

The debt-to-equity ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Total liabilities	￦	16,712,367		￦	17,815,630
Total equity		13,183,354			14,658,490
Debt-to-equity ratio		127	%		122	%

The Group manages capital on the basis of the gearing ratio. This ratio is calculated as net debt divided by total capital. Net debt is calculated as total borrowings less cash and cash equivalents. Total capital is calculated as ‘equity’ in the statement of financial position plus net debt.

The gearing ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won, %)	December 31, 2017			December 31, 2018
Total borrowings	￦	6,860,539		￦	6,648,293
Less: cash and cash equivalents		(1,928,182	)		(2,703,422	)
Net debt		4,932,357			3,944,871
Total equity		13,183,354			14,658,490
Total capital		18,115,711			18,603,361
Gearing ratio		27	%		21	%

F-90

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(3) Offsetting Financial Assets and Financial Liabilities

Details of the Group’s recognized financial assets subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedge1	￦	3,284	￦	—		￦	3,284	￦	(3,284	)	￦	—	￦	—
Trade receivables2		85,755		(5,010	)		80,745		(73,109	)		—		7,636
Other financial assets		8,680		(436	)		8,244		(5,307	)		—		2,937
	￦	97,719	￦	(5,446	)	￦	92,273	￦	(81,700	)	￦	—	￦	10,573

(In millions of Korean won)	December 31, 2018
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables2	￦	78,833	￦	(1	)	￦	78,832	￦	(76,414	)	￦	—	￦	2,418
Other financial assets		19,825		—			19,825		(19,825	)		—		—
	￦	98,658	￦	(1	)	￦	98,657	￦	(96,239	)	￦	—	￦	2,418

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies

The Group’s recognized financial liabilities subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedging1	￦	26,135	￦	—		￦	26,135	￦	(3,284	)	￦	—	￦	22,851
Trade payables2		80,829		(5,217	)		75,612		(73,109	)		—		2,503
Other financial liabilities		5,549		(229	)		5,320		(5,307	)		—		13
	￦	112,513	￦	(5,446	)	￦	107,067	￦	(81,700	)	￦	—	￦	25,367

F-91

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	December 31, 2018
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables2	￦	78,317	￦	—		￦	78,317	￦	(76,413	)	￦	—	￦	1,904
Other financial liabilities		19,827		(1	)		19,826		(19,825	)		—		1
	￦	98,144	￦	(1	)	￦	98,143	￦	(96,238	)	￦	—	￦	1,905

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies.

37. Fair Value

37.1 Fair Value of Financial Instruments by Category

Carrying amount and fair value of financial instruments by category as at December 31, 2017 and 2018, are as follows:

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	1,928,182		1	￦	2,703,422		1
Trade and other receivables
Financial assets measured at amortized cost		6,793,397		1		5,425,996		1
Financial assets at fair value through other comprehensive income		—		—		1,097,348		1,097,348
Other financial assets
Financial assets measured at amortized cost2		1,333,368		1		484,271		1
Financial assets at fair value through profit or loss2		5,913		5,913		777,685		777,685
Financial assets at fair value through other comprehensive income2		—		—		326,157		326,157
Available-for-sale financial assets3		319,402		319,402		—		—
Derivative financial assets for hedging		7,389		7,389		29,843		29,843
Total	￦	10,387,651			￦	10,844,722
Financial liabilities
Trade and other payables	￦	8,427,457		1	￦	8,521,379		1
Borrowings		6,683,662		6,738,326		6,648,293		1
Other financial liabilities
Financial liabilities at amortized cost		87,670		1		99,330		1

F-92

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial liabilities at fair value through profit or loss		5,051		5,051		7,758		7,758
Derivative financial liabilities for hedging		93,770		93,770		57,308		57,308
Total	￦	15,297,610			￦	15,334,068

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value.

2 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets and financial assets held-to-maturity.

3 As at December 31, 2017, equity instruments that do not have a quoted price in an active market are measured at cost because their fair value cannot be measured reliably and excluded from the fair value disclosures.

37.2 Fair Value Hierarchy

Assets measured at fair value or for which the fair value is disclosed are categorized within the fair value hierarchy, and the defined levels are as follows:

• Quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1).

• Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (that is, prices) or indirectly (that is, derived from prices) (Level 2).

• Inputs for the asset or liability that are not based on observable market data (that is, unobservable inputs) (Level 3).

F-93

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value or its fair value is disclosed as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Recurring fair value measurements
Other financial assets
Financial assets at fair value through profit or loss	￦	—	￦	—	￦	5,813	￦	5,813
Derivative financial assets for hedging		—		7,389		—		7,389
Available-for-sale financial assets		6,859		5,466		307,077		319,402
Disclosed fair value
Investment properties1		—		—		1,755,600		1,755,600
Total	￦	6,859	￦	12,855	￦	2,068,490	￦	2,088,204
Liabilities
Recurring fair value measurements
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	5,051	￦	5,051
Derivative financial liabilities for hedging		—		76,045		17,725		93,770
Total	￦	—	￦	76,045	￦	22,776	￦	98,821

1 The highest and best use of a non-financial asset does not differ from its current use.

	December 31, 2018
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,097,348	￦	—	￦	1,097,348
Other financial assets
Financial assets at fair value through profit or loss1		121		613,964		163,600		777,685
Financial assets at fair value through other comprehensive income1		8,861		5,760		311,536		326,157
Derivative financial assets for hedging		—		29,843		—		29,843
Disclosed fair value
Investment properties2		—		—		1,821,061		1,821,061
Total	￦	8,982	￦	1,746,915	￦	2,296,197	￦	4,052,094
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	7,758	￦	7,758
Derivative financial liabilities for hedging		—		47,125		10,183		57,308
Total	￦	—	￦	47,125	￦	17,941	￦	65,066

F-94

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

1 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

2 The highest and best use of a non-financial asset does not differ from its current use.

37.3 Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements

(a) Details of transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements are as follows:

There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements.

(b) Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Financial assets at fair value through profit or loss			Available-for-sale			Other derivative financial liabilities		Derivative financial liabilities for hedging
Beginning balance	￦	6,277		￦	287,889		￦	1,973	￦	—
Reclassification		—			(277	)		—		—
Amount recognized in other comprehensive income		—			58,450			—		(1,909	)
Purchases		—			85,287			—		—
Amount recognized in profit or loss		(464	)		(113	)		3,078		19,634
Sales		—			(124,159	)		—		—
Ending balance	￦	5,813		￦	307,077		￦	5,051	￦	17,725

	2018
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss3			Financial assets at fair value through other comprehensive income3			Financial liabilities at fair value through profit or loss2		Derivative financial liabilities for hedging1
Beginning balance	￦	97,547		￦	238,517		￦	5,051	￦	17,725
Changes in accounting policy		32,745			2,085			—		—
Purchases		21,365			8,802			—		—
Reclassification		1,581			(296	)		—		—
Changes in scope of consolidation		—			364			—		—
Sales		(1,852	)		(1,099	)		—		—
Amount recognized in profit or loss1,2		12,214			89			2,707		(17,255	)
Amount recognized in other comprehensive income1		—			63,074			—		9,713
Ending balance	￦	163,600		￦	311,536		￦	7,758	￦	10,183

1 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of both gain on valuation of derivatives and accumulated other comprehensive loss.

F-95

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of loss on valuation of derivatives.

3 In prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

37.4 Valuation Technique and the Inputs

Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Other financial assets
Derivative financial assets for hedging	￦	7,389		2	DCF Model
Available-for-sale financial assets		312,543		2,3	DCF Model
Financial assets at fair value through profit or loss		5,813		3	DCF Model
Investment properties		1,755,600		3	DCF Model
Liabilities
Other financial liabilities
Derivative financial liabilities for hedging	￦	93,770		2,3	Hull-White model, DCF Model
Other derivative financial liabilities		5,051		3	DCF Model, Comparable Company Analysis

	December 31, 2018
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,097,348		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		777,564		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		317,296		2,3	DCF Model
Derivative financial assets for hedging		29,843		2	DCF Model
Investment properties		1,821,061		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	7,758		3	DCF Model, Comparable Company Analysis
Derivative financial liabilities for hedging		57,308		2,3	Hull-White model, DCF Model

F-96

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

37.5 Valuation Processes for Fair Value Measurements Categorized Within Level 3

The Group uses external experts that perform the fair value measurements required for financial reporting purposes. External experts report directly to the chief financial officer (CFO), and discusses valuation processes and results with the CFO in line with the Group’s reporting dates.

37.6 Gains and losses on valuation at the transaction date

In the case that the Group values derivative financial instruments using inputs not based on observable market data, and the fair value calculated by the said valuation technique differs from the transaction price, then the fair value of the financial instruments is recognized as the transaction price. The difference between the fair value at initial recognition and the transaction price is deferred and amortized using a straight-line method by maturity of the financial instruments. However, in the case that inputs of the valuation techniques become observable in markets, the remaining deferred difference is immediately recognized in full in profit for the year.

In relation to this, details and changes of the total deferred difference for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017						2018
	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	—		￦	(8,470	)	￦	6,532		￦	(5,647	)
II. New transactions		7,126			—			—			—
III. Recognized at fair value through profit or loss		(594	)		2,823			(1,425	)		2,823
IV. Ending balance (I+II+III)	￦	6,532		￦	(5,647	)	￦	5,107		￦	(2,824	)

38. Interests in Unconsolidated Structured Entities

Details of information about its interests in unconsolidated structured entities, which the Group does not have control over, including the nature, purpose and activities of the structured entity and how the structured entity is financed, are as follows:

Classes of entities

Nature, purpose, activities and others

Real estate finance

A structured entity incorporated for the purpose of real estate development is provided with funds by investors’ investments in equity and borrowings from financial institutions (including long-term and short-term loans and issuance of ABCP due in three months), and based on these, the structured entity implements activities such as real estate acquisition, development and mortgage loans. The structured entity repays loan principals with funds incurred from instalment house sales after the completion of real estate development or with collection of the principal of mortgage loan. The remaining shares are distributed to investors. As at December 31, 2018, this entity is engaged in real estate finance structured entity, and generates revenues by receiving dividends from direct investments in or receiving interests on loans to the structured entity. Financial institutions, including the Entity, are provided with guarantees including joint guarantees or real estate collateral from investors and others.

F-97

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Classes of entities	Nature, purpose, activities and others
	Consequently, the entity is a priority over other parties in the preservation of claim. However, when the credit rating of investors and others decreases or when the value of real estate decreases, the entity may be obliged to cover losses.
PEF and investment funds	Minority investors including managing members contribute to PEF and investment funds incorporated for the purpose of providing funds to the small, medium, or venture entities, and the managing member implements activities such as investments in equity or loans based on the contributions. As at December 31, 2018, the entity is engaged in PEF and investment funds structured entity, and after contributing to PEF and investment funds, the entity receives dividends for operating revenues from these contributions. The entity is provided with underlying assets of PEF and investment funds as collateral. However, when the value of the underlying assets decreases, the entity may be obliged to cover losses.
Asset securitization	The Group transfers accounts receivable for handset sales to its Special Purpose Company (“SPC”) for asset securitization. SPC issues the asset-backed securities with accounts receivable for handset sales as an underlying asset, and makes payment for the underlying asset acquired.

Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,426,620	￦	3,779,377	￦	2,619,445	￦	7,825,442
Assets recognized in statement of financial position
Other financial assets	￦	21,800	￦	52,666	￦	—	￦	74,466
Joint ventures and associates		10,168		164,030		—		174,198
Total	￦	31,968	￦	216,696	￦	—	￦	248,664
Maximum loss exposure1
Investment assets	￦	31,968	￦	216,696	￦	—	￦	248,664
Total	￦	31,968	￦	216,696	￦	—	￦	248,664

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

F-98

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	December 31, 2018
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,429,910	￦	3,701,718	￦	2,751,208	￦	7,882,836
Assets recognized in statement of financial position
Other financial assets	￦	24,421	￦	94,075	￦	—	￦	118,496
Joint ventures and associates		7,293		166,159		—		173,452
Total	￦	31,714	￦	260,234	￦	—	￦	291,948
Maximum loss exposure1
Investment assets	￦	31,714	￦	260,234	￦	—	￦	291,948
Total	￦	31,714	￦	260,234	￦	—	￦	291,948

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

39. Information About Non-controlling Interests

39.1 Changes in Accumulated Non-controlling Interests

Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2016, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2016
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	316,880	￦	22,445	￦	(8,279	)	￦	(1,370	)	￦	329,676
BC Card Co., Ltd.		30.46	%		322,921		47,068		(44,637	)		3,986			329,338
KT Powertel Co., Ltd.		55.15	%		50,926		112		—			713			51,751
KT Hitel Co., Ltd.		35.27	%		50,689		1,274		—			(165	)		51,798
KT Telecop Co., Ltd.		13.18	%		103,428		19		—			85			103,532

(In millions of Korean won)	December 31, 2017
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	329,676	￦	9,395	￦	(9,817	)	￦	(952	)	￦	328,302
BC Card Co., Ltd.		30.46	%		329,338		43,961		(29,490	)		(4,742	)		339,067
KT Powertel Co., Ltd.		55.15	%		51,751		1,165		—			137			53,053
KT Hitel Co., Ltd.		32.87	%		51,798		870		—			478			53,146
KT Telecop Co., Ltd.		13.18	%		103,532		381		—			(445	)		103,468

F-99

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	December 31, 2018
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests			Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.46	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.15	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co., Ltd.		32.87	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.18	%		103,468		59			—			(170	)		103,357

39.2 Summarized Financial Information on Subsidiaries

The summarized financial information for each subsidiary with non-controlling interests that are material to the Group before inter-company eliminations is as follows:

Summarized consolidated statements of financial position as at December 31, 2016, 2017 and 2018, are as follows:

	December 31, 2016
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		35.27	%		13.18	%
Current assets	￦	352,980		￦	2,945,584		￦	69,046		￦	158,210		￦	63,802
Non-current assets		424,968			705,480			44,679			90,992			201,751
Current liabilities		151,329			2,530,832			17,910			45,277			53,903
Non-current liabilities		80,123			71,571			1,989			1,664			78,441
Equity		546,496			1,048,661			93,826			202,261			133,209
Operating revenue		668,945			3,567,512			81,390			198,994			315,948
Profit or loss for the year		68,863			163,131			202			4,298			143
Total comprehensive income		68,785			178,744			202			1,399			143
Cash flows from operating activities		155,399			92,818			7,271			28,987			60,461
Cash flows from investing activities		(210,480	)		(37,313	)		(8,191	)		(33,238	)		(45,243	)
Cash flows from financing activities before dividend paid to non-controlling interests		(16,647	)		(147,306	)		—			—			—
Dividend paid to non-controlling interests		(8,279	)		(44,637	)		—			—			—
Gain or loss foreign currency translation		—			(178	)		—			3			—
Net (decrease)/increase in cash and cash equivalents		(71,728	)		(91,801	)		(920	)		(4,251	)		15,218

F-100

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

	December 31, 2017
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	324,632		￦	3,225,262		￦	73,527		￦	150,368		￦	73,023
Non-current assets		468,261			823,001			41,598			107,872			191,330
Current liabilities		185,995			2,868,669			18,450			49,922			90,569
Non-current liabilities		24,555			86,369			487			3,021			41,064
Equity		582,343			1,093,225			96,188			205,297			132,720
Operating revenue		687,752			3,628,995			69,234			227,884			317,591
Profit or loss for the year		57,314			156,109			2,112			3,225			2,885
Total comprehensive income (loss)		55,586			141,719			2,362			3,036			(490	)
Cash flows from operating activities		99,269			108,203			13,895			28,320			57,262
Cash flows from investing activities		(81,758	)		(568,518	)		(17,354	)		(36,086	)		(43,483	)
Cash flows from financing activities before dividend paid to non-controlling interests		(19,739	)		(97,221	)		—			—			—
Dividend paid to non-controlling interests		(9,817	)		(29,490	)		—			—			—
Gain or loss foreign currency translation		—			(184	)		—			(47	)		—
Net (decrease)/increase in cash and cash equivalents		(2,228	)		(557,536	)		(3,459	)		(7,766	)		13,779

	December 31, 2018
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	301,739		￦	2,997,429		￦	84,785		￦	161,162		￦	52,367
Non-current assets		514,263			724,950			39,279			111,546			220,125
Current liabilities		112,411			2,520,050			27,187			63,231			85,648
Non-current liabilities		37,430			110,486			1,030			2,812			54,666
Equity		666,161			1,091,843			95,847			206,665			132,178
Operating revenue		694,059			3,551,715			65,620			279,117			328,262
Profit or loss for the year		52,010			70,889			(5,545	)		657			166
Total comprehensive income (loss)		47,787			116,604			(5,792	)		738			(1,517	)
Cash flows from operating activities		183,474			86,299			11,603			43,855			40,351
Cash flows from investing activities		(139,846	)		128,538			(2,580	)		(26,335	)		(76,969	)
Cash flows from financing activities		(77,647	)		(117,561	)		—			—			10,000
Net increase (decrease) in cash and cash equivalents		(34,019	)		97,276			9,023			17,520			(26,618	)
Cash and cash equivalents at beginning of year		65,747			177,826			6,626			21,647			32,326
Exchange differences		—			(13	)		—			19			—
Cash and cash equivalents at end of year		31,728			275,089			15,649			39,186			5,708

F-101

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

39.3 Transactions with Non-controlling Interests

The effect of changes in the ownership interest on the equity attributable to owners of the Group during 2016, 2017 and 2018 is summarized as follows:

(In millions of Korean won)	2016		2017			2018
Carrying amount of non-controlling interests acquired	￦	4,022	￦	(732	)	￦	(194	)
Consideration paid to non-controlling interests		7,347		6,173			11,312
Excess of consideration paid recognized in parent’s equity	￦	11,369	￦	5,441		￦	11,118

40. Business Combination

On May 31, 2018, the Group’s subsidiary, KT Telecop Co., Ltd. acquired the unmanned security business and SI (System Integration) business of SG Safety Corporation for ￦27,570 million. The acquisition is expected to increase the Group’s market share and competitiveness in the market. The Group additionally acquired treasury stock from MOS GB Co., Ltd. and MOS Chungcheong Co., Ltd., associates of the Group, for ￦11,048 million. The business combination is expected to enhance specialization and efficiency in installation of wireless network infrastructure and its maintenance. GENIE Music Corporation, a subsidiary of the Group, merged with CJ Digital Music Co., Ltd. (“acquired company”) by issuing 8,922,685 shares of subsidiaries to CJ ENM CO., Ltd., who owns 100% of shares of the acquired company, and acquiring all shares (1,600,000 shares) of the acquired company. The merger is expected to increase the Group’s market share in music service and distribution business, and also reduce costs through economies of scale.

Details of the business combination are as follows:

(In millions of Korean won)	Business line	Date	Purchase consideration
SG Safety Corporation	Unmanned security business	May 31, 2018	￦	27,544
KT MOS Bukbu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		8,160
KT MOS Nambu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		6,310
CJ Digital Music Co., Ltd.	Music distribution	October 10, 2018		50,948

Fair value of the purchase consideration from the business combination is as follows:

(In millions of Korean won)	SG Safety Corporation			KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Cash and cash equivalents	￦	28,000		￦	6,283	￦	4,765	￦	—
Settled receivables1		(456	)		—		—		—
Fair value of equity instruments previously held2		—			1,877		1,545		—
Fair value of equity instruments newly issued3		—			—		—		50,948
Total	￦	27,544		￦	8,160	￦	6,310	￦	50,948

1 Uncollected amount which incurred after the payment of consideration from adjustment of purchase consideration caused by additional retirement benefit.

F-102

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

2 The shares previously held by KT MOS Bukbu Co., Ltd. (93,994 ordinary shares) and KT MOS Nambu Co., Ltd. (65,831 ordinary shares), non-listed entities, were evaluated by using the profit approach.

3 The fair value (￦50,948 million) of 8,992,685 ordinary shares of GENIE Music Corporation, the consideration transferred, was based on the share price disclosed at the merger date. The issuance cost amounting to ￦31 million were deducted from deemed issuance price.

Fair value of the assets and liabilities recognized as a result of the acquisition at the acquisition date are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Recognized amounts of identifiable assets acquired	￦	17,763	￦	14,924	￦	12,242	￦	28,117
Cash and cash equivalents		—		7,864		3,340		1,556
Trade and other receivables		—		4,827		6,318		11,200
Other current assets		1,367		160		85		484
Inventories		—		—		—		5
Current income tax assets		—		—		75		—
Property and equipment		4,047		855		1,104		791
Intangible assets				997		478		1,860
Distribution agency contract (included in intangibles)		—		—		—		11,753
Contractual customer relationship (included in intangibles)		10,467		—		—		468
Deferred income tax assets		—		113		576		—
Other non-current assets		1,882		10		—		—
Other non-current financial assets		—		98		266		—
Recognized amounts of identifiable liabilities assumed		5,637		10,050		6,433		25,559
Trade and other payables		120		6,767		3,327		18,947
Borrowings		5,000		—		—		—
Other current liabilities		—		363		703		3,481
Current income tax liabilities		—		103		—
Post-employment benefit obligations		517		2,768		2,360		311
Deferred income tax liabilities		—		—		—		2,497
Other non-current liabilities		—		49		43		323
Total	￦	12,126	￦	4,874	￦	5,809	￦	2,558

F-103

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

As at December 31, 2018, details of the recognized goodwill as a result of the business combination are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration	￦	27,544	￦	8,160	￦	6,310	￦	50,948
Add: Non-controlling interests1		—		—		101		—
Less:
Fair value of identifiable net assets		12,126		4,874		5,809		2,558
Goodwill2	￦	15,418	￦	3,286	￦	602	￦	48,390

1 Non-controlling interests for KT MOS Nambu Co., Ltd. acquired during the year ended December 31, 2018 are measured at proportionate shares of acquiree’s identifiable net assets.

2 The goodwill from the business combination is attributable to economies of scale expected and the acquired customer relationships.

Details of cash outflows as a result of acquisition are as follows:

(In millions of Korean won)	SG Safety Corporation1		KT MOS Bukbu Co., Ltd			KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration
Cash1	￦	28,000	￦	6,283		￦	4,765	￦	—
Less:
Recognized amounts of cash and cash equivalents		—		7,864			3,340		1,556
Total	￦	28,000	￦	(1,581	)	￦	1,425	￦	(1,556	)

1 The difference from purchase considerations of ￦27,544 million is attributable to uncollected settled receivables.

Since the unmanned security business acquired from SG Safety Corporation is incorporated into the Group’s main business segment, the security services business, it is difficult to identify revenue and net profit generated from business combination during the reporting period.

Since KT MOS Bukbu Co., Ltd. and KT MOS Nambu Co., Ltd. are incorporated into the network business, it is difficult to identify revenue and net profit generated from business combination during the reporting period.

According to the contract, KT Telecop Co., Ltd. has the right to be reimbursed from SG Safety Corporation in the amount equivalent to 35 times the difference between the target revenue and monthly security business revenue as at December 31, 2023. However, as at the end of the reporting period, related reimbursement asset is not recognized since it is reasonably expected that the revenue will meet its target.

41. Changes in Accounting Policies

(1) Adoption of IFRS 15 Revenue from Contracts with Customers

As explained in Note 2, the Group has applied IFRS 15 Revenue from Contracts with Customers from January 1, 2018. In accordance with the transitional provisions in IFRS 15, comparative

F-104

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

figures have not been restated. Financial statement line items affected by the adoption of the new rules in the current period are as follows:

The impact on the financial statements due to the application of IFRS 15 at the date of initial application (January 1, 2018) is as follows:

	January 1, 2018
(In millions of Korean won)	Before application of IFRS 15 (*)		Adjustment			After application of IFRS 15
Current assets	￦	9,828,525	￦	1,288,908		￦	11,117,433
Trade and other receivables		5,964,565		4,475			5,969,040
Inventories		642,027		—			642,027
Other current assets1,2		304,860		1,284,433			1,589,293
Others		2,917,073		—			2,917,073
Non-current assets		20,067,196		68,060			20,135,256
Trade and other receivables		828,832		(2,285	)		826,547
Deferred income tax assets		712,222		(352,273	)		359,949
Other non-current assets1,2		107,165		422,618			529,783
Others		18,418,977		—			18,418,977
Total assets	￦	29,895,721	￦	1,356,968		￦	31,252,689
Current liabilities	￦	9,474,162	￦	269,893		￦	9,744,055
Trade and other payables		7,426,088		297			7,426,385
Deferred revenue		17,906		33,655			51,561
Provisions		78,172		177			78,349
Other current liabilities1		258,315		235,764			494,079
Others		1,693,681		—			1,693,681
Non-current liabilities		7,238,205		80,236			7,318,441
Deferred revenue		91,698		23,831			115,529
Deferred income tax liabilities		128,462		6,905			135,367
Other non-current liabilities1		237,283		49,500			286,783
Others		6,780,762		—			6,780,762
Total liabilities	￦	16,712,367	￦	350,129		￦	17,062,496
Equity attribute to owners of the Controlling Company	￦	11,791,590	￦	929,866		￦	12,721,456
Non-controlling interest		1,391,764		76,973			1,468,737
Total equity	￦	13,183,354	￦	1,006,839		￦	14,190,193

(*) The amounts in this column are before the adjustments from the adoption of IFRS 9.

F-105

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

The effect of adoption of IFRS 15 on the consolidated financial statements for the year ended December 31, 2018, is as follows.

- Consolidated statement of financial position

	December 31, 2018
(In millions of Korean won)	Reported Amount (*)		Adjustments			Amount before application of IFRS 15
Current assets	￦	12,157,814	￦	(1,335,128	)	￦	10,822,686
Trade and other receivables		5,680,349		7,141			5,687,490
Inventories		1,074,634		53,035			1,127,669
Other current assets1,2		1,687,548		(1,395,304	)		292,244
Others		3,715,283		—			3,715,283
Non-current assets		20,316,306		(87,432	)		20,228,874
Trade and other receivables		842,995		4,617			847,612
Deferred income tax assets		465,369		356,928			822,297
Other non-current assets1,2		545,895		(448,977	)		96,918
Others		18,462,047		—			18,462,047
Total assets	￦	32,474,120	￦	(1,422,560	)	￦	31,051,560
Current liabilities	￦	9,394,123	￦	(318,260	)	￦	9,075,863
Deferred revenue		52,878		(38,057	)		14,821
Provisions		117,881		(565	)		117,316
Other current liabilities1		596,589		(279,638	)		316,951
Others		8,626,775		—			8,626,775
Non-current liabilities		8,421,507		(54,508	)		8,366,999
Deferred revenue		110,702		(27,233	)		83,469
Deferred income tax liabilities		204,785		(21,019	)		183,766
Other non-current liabilities1		423,626		(6,256	)		417,370
Others		7,682,394		—			7,682,394
Total liabilities	￦	17,815,630	￦	(372,768	)	￦	17,442,862
Equity attribute to owners of the Controlling Company	￦	13,129,901	￦	(970,430	)	￦	12,159,471
Non-controlling interest		1,528,589		(79,362	)		1,449,227
Total equity	￦	14,658,490	￦	(1,049,792	)	￦	13,608,698

(*) Amounts include adjustments arising from adoption of IFRS 9.

¹  Allocation the transaction price

With the implementation of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer. To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct goods or services underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The stand-alone selling price is the price at which the Group would sell

F-106

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

promised goods or services separately to the customer. The best evidence of a stand-alone selling price is the observable price of a goods or services when the Group sells that goods or services separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

In relation to this, as at December 31, 2018, contract assets and contract liabilities are increased by ￦398,797 million (January 1, 2018: ￦421,131 million) and ￦347,461 million (January 1, 2018: ￦282,836 million), respectively.

²  Incremental costs of obtaining a contract

The Group pays the commission fees when new customer subscribe for telecommunication services. The incremental costs of obtaining a contract are those commission fees that the Group incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained.

According to IFRS 15, the Group recognizes as an asset the incremental cost of obtaining contract and amortize it through the contract period. However, as a practical expedient, the Group recognizes the incremental costs of obtaining a contracts as an expense when incurred if the amortization period of the asset is one year or less.

In relation to this, prepaid expenses are increased by ￦1,444,822 million as at December 31, 2018 (January 1, 2018: ￦1,285,443 million).

- Consolidated statement of profit or loss

	2018
(In millions of Korean won)	Reported Amount (*)			Adjustments			Amount before application of IFRS 15
Operating revenue	￦	23,436,050		￦	268,270		￦	23,704,320
Operating expenses		22,335,190			316,495			22,651,685
Operating profit		1,100,860			(48,225	)		1,052,635
Financial income		374,243			(3,862	)		370,381
Financial costs		435,659			16,860			452,519
Share of net losses of associates and joint venture		(5,467	)		—			(5,467	)
Profit before income tax		1,033,977			(68,947	)		965,030
Income tax expense		314,565			(17,944	)		296,621
Profit for the year	￦	719,412		￦	(51,003	)	￦	668,409

(*) Amounts include adjustments arising from adoption of IFRS 9.

- Consolidated statement of cash flows

The application of IFRS 15 has no material impact on cash flows from operating, investing and financing activities on the statements of cash flows.

F-107

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(2) Adoption of IFRS 9 Financial Instruments

The Group has applied IFRS 9 Financial Instruments from January 1, 2018. In accordance with the transitional provisions in IFRS 9, comparative figures have not been adjusted.

IFRS 9 replaces IAS 39, Financial Instruments: Recognition and Measurement, relating to the recognition of financial assets and financial liabilities, classification, measurement and elimination of financial instruments, impairment of financial assets and hedge accounting. IFRS 9 also significantly amends other standards dealing with financial instruments such as IFRS 7 Financial Instruments: Disclosures.

(a) Beginning balance of retained earnings after adjustment

Details of the Group’s beginning balance of retained earnings after adjustment due to application of IFRS 9, are as follows:

(In millions of Korean won)	January 1, 2018
Beginning balance — IAS 39	￦	9,961,150
Reclassification of available-for-sale securities to financial assets at fair value through profit or loss		32,754
Reclassification of available-for-sale securities to financial assets at fair value through other comprehensive income		2,191
Increase in provision for impairment of financial assets at amortized cost		(1,817	)
Increase in provision with unused limit		(287	)
Decrease in deferred income tax assets		(8,395	)
Adjustments of non-controlled interests		(259	)
Adjustments to retained earnings from adoption of IFRS 9		24,187
Beginning balance of retained earnings — IFRS 9		9,985,337
Adjustment to retained earnings from adoption of IFRS 15		929,866
Beginning balance of retained earnings after adjustment	￦	10,915,203

(b) Classification and Measurement of Financial Instruments

On the date of initial application of IFRS 9, January 1, 2018, the Group’s management has assessed which business models apply to the financial assets held by the Group and has classified its financial instruments into the appropriate IFRS 9 categories. The main effects resulting from this reclassification are as follows:

(In millions of Korean won)	Classification in accordance with		Amount in accordance with
Account	IAS 39	IFRS 9	IAS 39		IFRS 9		Differences
Financial assets
Cash and cash equivalent	Loans and receivables	Financial assets measured at amortized cost	￦	1,928,182	￦	1,928,182	￦	—
Trade and other receivables	Loans and receivables	Financial assets measured at amortized cost		6,793,397		5,836,089		(1,028	)

F-108

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	Classification in accordance with		Amount in accordance with
Account	IAS 39	IFRS 9	IAS 39		IFRS 9		Differences
		Financial assets at fair value through other comprehensive income				980,766		24,486
Other financial assets	Loans and receivables	Financial assets measured at amortized cost		1,333,317		462,075		(789)
		Financial assets at fair value through profit or loss				870,453		—
	Financial assets at fair value through profit or loss	Financial assets at fair value through profit or loss		5,813		5,813		—
	Derivative financial assets for hedging purpose	Derivative financial assets for hedging purpose		7,389		7,389		—
	Financial assets available-for-sale	Financial assets measured at amortized cost				28,603		—
		Financial assets at fair value through profit or loss		380,953		127,276		32,745
		Financial assets at fair value through other comprehensive income				259,904		2,085
	Financial assets held-to-maturity	Financial assets measured at amortized cost				51		—
		Financial assets at fair value through profit or loss		151		100		—
		Financial assets at fair value through other comprehensive income				—		—

F-109

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

(In millions of Korean won)	Classification in accordance with		Amount in accordance with
Account	IAS 39	IFRS 9	IAS 39		IFRS 9		Differences
Financial liabilities
Trade payables and payables	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		￦8,427,457		￦8,427,457		￦—
Borrowing	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		6,683,662		6,683,662		—
Other financial liabilities	Financial liabilities at fair value through profit or loss	Financial liabilities at fair value through profit or loss		5,051		5,051		—
Other financial liabilities	Derivative financial liabilities for hedging purpose	Derivative financial liabilities for hedging purpose		93,770		93,770		—
Other financial liabilities (*)	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		89,104		89,391		287

(*) The amount includes provisions of which loss allowance is remeasured due to adoption of IFRS 9.

The impact on these changes on the Group’s equity as at January 1, 2018, is as follows:

(In millions of Korean won)	Accumulated other comprehensive income			Retained earnings
Reclassification from loans and receivables to financial assets at fair value through other comprehensive income, and fair value assessment	￦	24,486		￦	—
Reclassification from available-for-sale financial assets to financial assets at fair value through profit or loss, and fair value assessment		(9	)		32,754
Reclassification from available-for-sale financial assets to financial assets at fair value through other comprehensive income		(106	)		2,191
Increase in provision for impairment of financial assets at amortized cost		—			(1,817	)
Increase in provision with unused limit		—			(287	)
Income tax effect		(6,734	)		(8,395	)
Adjustments of non-controlled interests		104			(259	)
Total adjustments from application of IFRS 9	￦	17,741		￦	24,187

F-110

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

42. Events after Reporting Period

Subsequent to the reporting period, public bonds issued are as follow:

	December 31, 2018
(In millions of Korean won)	Issue date		Carrying amount		Interest rate			Redemption date
The 191-1st Public bond		2019.01.15	￦	220,000		2.048	%		2022.01.14
The 191-2nd Public bond		2019.01.15		80,000		2.088	%		2024.01.15
The 191-3rd Public bond		2019.01.15		110,000		2.160	%		2029.01.15
The 191-4th Public bond		2019.01.15		90,000		2.213	%		2039.01.14

43. Revision of prior financial statements

The Group revised the prior period financial statements to correct errors in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system, and the details are as follows:

Consolidated Statements of financial position

(In millions of Korean won)	January 1, 2017						December 31, 2017
	As Previously Reported		Adjustments		As Revised		As Previously Reported		Adjustments		As Revised
Current assets	￦	9,716,020	￦	150,282	￦	9,866,302	￦	9,678,243	￦	150,282	￦	9,828,525
Trade and other receivables		5,327,352		150,282		5,477,634		5,814,283		150,282		5,964,565
Total assets	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721
Current liabilities	￦	9,523,137	￦	16,058	￦	9,539,195	￦	9,458,104	￦	16,058	￦	9,474,162
Trade and other payables		7,139,771		1,954		7,141,725		7,424,134		1,954		7,426,088
Current income tax liabilities		88,739		14,104		102,843		68,880		14,104		82,984
Total liabilities	￦	17,881,580	￦	16,058	￦	17,897,638	￦	16,696,309	￦	16,058	￦	16,712,367
Equity attribute to owners of the Controlling Company	￦	11,429,874	￦	134,224	￦	11,564,098	￦	11,657,366	￦	134,224	￦	11,791,590
Retained earnings		9,644,483		134,224		9,778,707		9,826,926		134,224		9,961,150
Total equity		12,782,718		134,224		12,916,942		13,049,130		134,224		13,183,354
Total liabilities and equity	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721

F-111

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2016, 2017 and 2018

Consolidated Statement of operations & Comprehensive Income

(In millions of Korean won)	Year ended December 31, 2016
	As Previously Reported		Adjustments		As Revised
Operating revenue	￦	23,120,878	￦	43,324	￦	23,164,202
Operating profit		1,339,780		43,324		1,383,104
Profit before income tax		1,123,431		43,324		1,166,755
Income tax expense		328,314		6,596		334,910
Profit for the year	￦	795,117	￦	36,728	￦	831,845
Profit for the year attributable to the equity holders of the Controlling Company		708,362		36,728		745,090
Total comprehensive income for the year	￦	789,447	￦	36,728	￦	826,175
Total comprehensive income for the year attributable to the equity holders of the Controlling Company	￦	701,685	￦	36,728	￦	738,413

Consolidated Statements of changes in equity

(In millions of Korean won)

As Previously Reported

Adjustments

As Revised

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Balance at January 1, 2016

￦

9,049,971

￦

10,835,735

￦

97,496

￦

97,496

￦

9,147,467

￦

10,933,231

Balance at December 31, 2016

￦

9,644,483

￦

11,429,874

￦

134,224

￦

134,224

￦

9,778,707

￦

11,564,098

Balance at December 31, 2017

￦

9,826,926

￦

11,657,366

￦

134,224

￦

134,224

￦

9,961,150

￦

11,791,590

The increase in retained earnings due to revision of prior period financial statements before January 1, 2016 is ￦97,496 million.

F-112

EX-1

Exhibit 1

THE ARTICLES OF INCORPORATION

OF

KT Corporation

Adopted on    October 1, 1997

Amended on    December 8, 1997

September 18, 1998

March 19, 1999

March 24, 2000

March 21, 2001

March 22, 2002

August 20, 2002

March 14, 2003

March 12, 2004

March 11, 2005

August 19, 2005

March 10, 2006

March 16, 2007

January 14, 2009

March 27, 2009

March 12, 2010

March 11, 2011

March 16, 2012

March 15, 2013

March 27, 2015

March 25, 2016

March 24, 2017

March 23, 2018

March 29, 2019

CHAPTER I. GENERAL PROVISIONS

Article 1. (Name) The name of the Corporation shall be “Chusik Hoesa KT”, which shall be written in English as “KT Corporation” (hereafter “KT”).

Article 2. (Purpose) The objective of KT is to engage in the following business activities:

1. Information and communications business

2. New media business and Internet Multimedia Broadcasting Business

3. Development and sale of software and contents

4. Sale and distribution of information communication equipment

5. Testing and inspection of information communication equipment, device or facilities

6. Advertisement business

7. Retail business via telephone, mail order or online

8. IT facility construction business, electrical construction business and fire protection facility business

9. Real estate and housing business

9-1. Business facilities management and Business support services

10. Electronic banking and finance business

11. Education and learning service business

12. Security service business (Machinery system surveillance service, Facilities security service, etc.)

13. Research and technical development, education, training and promotion, overseas businesses, and export and import, manufacture and distribution related to activities mentioned in Subparagraphs 1 through 12

14. Frequency-based telecommunications services and other telecommunications services

15. Value-added telecommunications business

16. Manufacture, provision (screening) and distribution of contents such as musical records, music videos, movies, videos and games

17. Issuance and management of pre-paid electronic payment instruments, and businesses related to electronic finance such as payment gateway services

18. Sales and leasing of equipment and facilities related to the activities mentioned in Subparagraphs 14 through 17

19. Any overseas business or export and import business related to activities mentioned in Subparagraphs 14 through 18

20. Tourism

21. (Deleted)

22. New and renewable energy, energy generation business, electrical system design and business and agency business for electrical safety management

23. Health Informatics business

24. Manufacture of communication equipment, device or facilities for military purpose

25. Energy examination business, Energy service company(ESCO) business, and other R of energy use related businesses

26. Business related to Information Security & Certification Service

27. Activities of management consultancy

28. Warehousing and storage

29. General construction business

30. Specialized design business

31. Any and all other activities or businesses incidental to or necessary for attainment of the foregoing.

Article 3. (Location of Offices) The head office of KT (the “head office”) shall be located in Seoul or Kyunggi Province. KT may establish requisite sub-offices at site(s) pursuant to resolution of the Board of Directors.

Article 4. (Method of Public Notice) Public notices by KT shall be given in The Seoul Shinmun circulated in Seoul, Republic of Korea. Provided, however, that if the public notices cannot be published in The Seoul Shinmun due to unavoidable circumstances, such public notices may be given in any daily newspaper published in Seoul, Republic of Korea.

CHAPTER II. SHARES OF STOCK

Article 5. (Amount of Authorized Capital)

The total number of shares authorized to be issued by KT shall be one billion shares.

Article 6. (Par Value and Types of Shares and Electronic registration for Rights to be indicated on Share certificates and Subscription right certificates)

(1) Par value per share issued by KT shall be 5,000 Korean Won. The type of shares shall be common shares and preferred shares, both of which shall be in registered form.

(2) Rights to be indicated on share certificates and subscription right certificates shall be electronically registered in the electronic register of electronic registry instead of being issued.

Article 7. (Shares to be Issued at the Time of Incorporation)

The total number of shares to be issued by KT at the time of incorporation shall be 395,675,369 shares.

Article 8. (Number and Description of Preferred Shares)

(1) The total number of Preferred Shares to be issued by KT shall be up to one- fourth (1/4) of the total number of shares issued and outstanding, which shall be without voting rights.

(2) Dividends on Preferred Shares shall be an amount not less than nine (9) percent p.a. of the par value as determined by the Board of Directors at the time of issuance.

(3) If the dividends on the Common Shares exceed those on Preferred Shares, the excess dividend amount shall also be paid to the holders of Preferred Shares commensurate to the rate applicable to Common Shares.

(4) If dividends on Preferred Shares are not paid for any fiscal year, the holders of such Preferred Shares shall be entitled to receive such accumulated unpaid dividend in priority to the holders of Common Shares from the dividends payable in the next fiscal year.

Article 9. (Preemptive Rights)

(1) When KT issues new shares, the shareholders of KT shall be entitled to subscribe for such new shares in proportion to their existing shareholdings.

(2) Notwithstanding Paragraph (1) above, new shares may be issued to persons other than the shareholders of KT, in the following cases:

1. When the new shares are issued by public offering or subscribed by underwriters pursuant to Article 4 and Article 119 of the Financial Investment Services and Capital Markets Act (“FSCMA”);

2. When the members of the Employee Stock Ownership Association of KT have preemptive rights to subscribe for such new shares pursuant to Article 165-7 of the FSCMA;

3. When the new shares are represented by depositary receipt pursuant to Article 165-16 of the FSCMA

4. When the new shares are issued by the exercise of stock options set forth in Article 10 of these Articles of Incorporation;

5. When the new shares are issued in order to accomplish specific business purposes such as strategic alliance, inducement of foreign funds, other capital raising requirements, introduction of new technology, and improvement of financial structure.

6. When the new shares are issued by a resolution of the Board of Directors through a general public offering pursuant to Article 165-6 of the FSCMA. However, in such case, the total number of the shares to be issued shall not exceed ten percent (10%) of the total number of KT issued and outstanding; or

7. When there exists an immediate need for the company to raise funds, new shares can be issued to domestic and foreign financial institutions (enacted on March 21, 2001).

(3) The method of disposition of shares in respect of which preemptive rights have not been exercised or where fractions of shares occur shall be determined by a resolution of the Board of Directors.

(4) Notwithstanding Paragraph (1) above, shareholders who acquire shares in violation of any laws and regulations or these Articles of Incorporation shall not be entitled to subscribe for new shares in respect of such shares.

Article 10. (Stock Options)

(1) KT may grant stock options to its officers and employees who have contributed, or are capable of contributing, to the establishment, management or technical innovation of KT, except for officers or employees in any of the following cases, by a Special Resolution of the General Meeting of Shareholders pursuant to Article 340-2 and Article 542-3 of the Commercial Code of Korea, to the extent not exceeding fifteen percent (15%) of the total number of issued shares, provided that KT may grant stock options by a resolution of the Board of Directors adopted by affirmative votes of two-thirds (2/3) of the directors in offices, to the extent not exceeding one percent (1%) of the total number of issued shares. In such case, the provision of the latter part of the Proviso of Paragraph 1 of Article 38 shall apply mutatis mutandis:

1. The largest shareholder of KT and the Related Person thereto (refers to the Related Person as prescribed in Paragraph 2-5, Article 542-8 of the Commercial Code of Korea. The same shall apply in this Article);

2. Major Shareholders (refers to the Major Shareholders as prescribed in Paragraph (2-6) of Article 542-8 of the Commercial Code of Korea. The same shall apply hereinafter) and the Related Person thereto; or

3. Any person who shall become a Major Shareholder of KT by exercising his/her stock options.

(2) The proviso of Paragraph (1) shall not apply to the directors of KT, and the grant of stock options pursuant to the proviso of Paragraph (1) shall be approved by the General Meeting of Shareholders which is held after such grant of stock options.

(3) The shares to be issued to the officers or employees by the exercise of their stock options (in case where KT pays in cash or shares the difference between the exercise price of stock options and the market price, refers to the shares which are the basis for such calculation) shall be Common Shares in registered form.

(4) The number of officers and employees of KT who are granted with stock options shall not exceed ninety nine percent (99%) of the total number of officers and employees in office. Stock options granted to one single officer or employee shall not exceed ten percent (10%) of total number of shares issued and outstanding.

(5) The exercise price per share of the stock options shall not be less than the price as set forth in the Commercial Code of Korea.

(6) Unless otherwise provided for by the relevant laws, the exercise period of stock options shall be determined by separate agreements, to the extent that such exercise periods shall not exceed seven (7) years from the date two (2) years have elapsed after the date of the General Meeting of Shareholders or the Meeting of the Board of Directors at which a resolution to grant such stock option rights is adopted.

(7) KT may cancel the grant of stock options by a resolution of the Board of Directors in any of the following cases:

1. When the relevant officer or employee of KT voluntarily retires from his/her office within two (2) years after the date of the General Meeting of Shareholders or the Meeting of the Board of Directors at which a resolution to grant such stock option rights is adopted;

2. When the relevant officer or employee of KT is dismissed for substantial damages incurred to KT due to his/her willful misconduct or gross negligence; or

3. When any event for the cancellation set forth in the agreement for granting such stock options occurs.

Article 11. (Base Date Regarding Dividends of the New Shares) In case KT issues new shares through right issues, bonus issues and stock dividends, with respect to the distribution of dividends on the new shares, the new shares shall be deemed to have been issued at the end of the fiscal year immediately prior to the fiscal year during which the new shares are issued.

Article 12. (Transfer Agent)

(1) KT may appoint a transfer agent to make entries in the register of shareholders.

(2) The transfer agent, and the place and scope of business of the transfer agent shall be determined by a resolution of the Board of Directors, and a public notice shall be given thereof.

Article 13. Void

Article 14. (Closing of the Register of Shareholders and the Record Date)

(1) KT shall suspend the entries of any changes into the register of shareholders regarding any rights on Shares from January 1 to January 31 of each year.

(2) KT shall let the shareholders who are entered into the register of shareholders on December 31 of each year exercise their rights thereof at the Ordinary General Meeting of Shareholders.

(3) KT may, for convening an Extraordinary General Meeting of Shareholders or when necessary, by a resolution of the Board of Directors, set the record date or close the register of shareholders for a certain period not exceeding three (3) months by giving at least two (2) weeks’ prior public notice.

CHAPTER III. DEBENTURES

Article 15. (Issuance of Convertible Bonds)

(1) KT may issue convertible bonds to persons other than shareholders to the extent that the aggregate face value of the convertible bonds so issued shall not exceed 2 trillion (2,000,000,000,000) Korean Won. Provided that, the issuance of convertible bonds to persons other than shareholders may be made in cases provided for by any of the Subparagraphs of Paragraph (2) of Article 9.

(2) The Board of Directors may determine that the convertible bonds referred to in Paragraph (1) may be issued on the condition that conversion rights will be attached to only a portion of the convertible bonds.

(3) The type of shares to be issued upon conversion of convertible bonds shall be common shares. The conversion price, which shall be equivalent to or more than the par value of the shares, shall be determined by the Board of Directors at the time of issuance.

(4) The period during which conversion rights may be exercised shall commence on the date set forth in the FSCMA after the date of issuance of the relevant convertible bonds and end on the date immediately preceding the redemption date thereof. However, the Board of Directors may adjust the conversion period in accordance with relevant laws within the above period by its resolution.

(5) For the purposes of any distribution of dividends on the shares issued upon conversion or any payment of interest on the convertible bonds, the convertible bonds shall be deemed to have been converted into shares at the end of the fiscal year immediately preceding the fiscal year in which the relevant conversion rights are exercised.

Article 16. (Issuance of Bonds with Warrants)

(1) KT may issue bonds with warrants to persons other than shareholders to the extent that the aggregate face value of the bonds with warrants so issued shall not exceed 2 trillion (2,000,000,000,000) Korean Won. Provided that, the issuance of bonds with warrants to persons other than shareholders may be made in only in cases provided for by Subparagraphs of Paragraph(2) of Article 9.

(2) The amount of new shares which can be subscribed by the holders of the bonds with warrants shall be determined by the Board of Directors, provided that the maximum amount of such new shares shall not exceed the aggregate face value of the bonds with warrants.

(3) The type of shares to be issued upon exercise of warrants shall be common shares. The issue price, which shall be equivalent to or more than the par value of the shares, shall be determined by the Board of Directors at the time of issuance.

(4) The period during which warrants may be exercised shall commence on the date set forth in the FSCMA after the date of issuance of the relevant bonds with warrants and end on the date immediately preceding the redemption date thereof. Provided that, the Board of Directors may adjust the conversion period in accordance with the relevant laws within the above period by its resolution.

(5) For the purposes of any distribution of dividends on the shares issued upon exercise of warrants, shares shall be deemed to have been issued at the end of the fiscal year immediately preceding the fiscal year in which the subscription monies therefor are fully paid.

Article 16-2. (Electronic registration of Rights to be indicated on Bonds and Subscription Warrants)

Rights to be indicated on bonds and subscription warrants shall be electronically registered in the electronic register of electronic registry instead of being issued.

Article 17. (Applicable Provisions regarding Issuance of Bonds)

The provisions of Articles 12 shall apply mutatis mutandis to the issuance of bonds.

CHAPTER IV. GENERAL MEETING OF SHAREHOLDERS

Article 18. (Convening of General Meeting)

(1) Ordinary General Meeting of Shareholders shall be convened within three (3) months after the end of each fiscal year, and Extraordinary General Meeting of Shareholders may be convened at any time, by the Representative Director President (hereafter “hwejang”) pursuant to a resolution of the Board of Directors except as otherwise provided by the relevant laws and regulations. Provided, however, that Article (29), Paragraph (2) shall apply mutatis mutandis in the event the President (hwejang) fails to perform his duties.

(2) Notice of the General Meeting of Shareholders specifying the time, place and purpose thereof shall be sent to each shareholder two (2) weeks prior to the date set for the General Meeting of Shareholders. However, such notice to the shareholders who hold less than one-hundredth (1/100) of the total number of shares with voting rights may be given in the form of a public notice of the meeting appearing twice or more in The Seoul Shinmun, The Maeil Business Newspaper and The Korean Economic Daily instead.

(3) General Meeting of Shareholders shall be held at the location of the head office, Seoul or its neighboring place.

Article 19. (Chairman) The President (hwejang) shall preside at the General Meeting of Shareholders; provided, however, that Paragraph (2) of Article 29 shall apply mutatis mutandis in the event that the President (hwejang) fails to perform his duties.

Article 20. (Chairman’s Right to Maintain Order)

(1) The Chairman shall suspend or cancel the proposal of any person who intentionally disrupts, by speech or behavior, the proceedings of the General Meeting of Shareholders or shall order such person to leave the General Meeting of Shareholders.

(2) If the Chairman deems it necessary for the smooth proceeding of the General Meeting of Shareholders, the Chairman may restrict the time and frequency of a shareholder’s proposal.

Article 21. (Voting by Proxy)

(1) A shareholder may exercise its voting rights by proxy.

(2) The proxy described in Paragraph (1) must file with KT a power of attorney before the opening of the General Meeting.

Article 22. (Method of Adoption of Resolutions) Resolutions of the General Meetings of Shareholders, except as otherwise provided by the relevant laws and regulations, shall be adopted if the approval of a majority vote of the shareholders present at such meeting is obtained and such majority also represents at least one-fourth (1/4) of the total number of shares issued and outstanding.

Article 22-2 (Exercise of Voting Rights by Writing)

(1) The Shareholders may exercise their voting rights by writing without attending the General Meetings of Shareholders in person.

(2) In case of Paragraph (1) above, KT shall send the notice of convening the General Meeting of Shareholders, together with written documents and reference materials necessary for the Shareholders to exercise their voting rights.

(3) The Shareholders desiring to exercise their voting rights by writing shall enter necessary matters in the written documents under paragraph (2) and submit them to KT by the date immediately preceding the date set for the Meeting.

Article 23. (Minutes of the General Meeting)

With respect to the proceedings of the General Meeting of Shareholders, the details of the proceedings and its resolutions shall be recorded in the minutes which shall bear the names and seals or signatures of the Chairman and the Directors present, and shall be preserved at the head office and branches.

CHAPTER V. DIRECTORS

Article 24. (Number of Directors) KT shall have not more than eleven (11) directors. The number of inside directors, including the hwejang, shall not exceed three (3), and the number of outside directors shall not exceed eight (8).

Article 25. (Election of President (hwejang), Representative Director and Directors)

(1) The President (hwejang) shall be elected by a resolution of the General Meeting of Shareholders among those who are recommended by the Board of Directors. However, if deemed necessary, one (1) inside director recommended by the President (hwejang) may be additionally elected as a representative director by a resolution of the Board of Directors.

(2) The dismissal of the President (hwejang) requires a resolution by the General Meeting of Shareholders adopted by the affirmative vote of two-thirds (2/3) of the voting rights of the shareholders in attendance at the Meeting; provided, however, that such votes shall represent at least one-third (1/3) of the total number of issued shares of KT. Dismissal of the Representative Director other than the President (hwejang) shall be in accordance with the resolution under Article 38 of these Articles of Incorporation.

(3) Inside directors other than the President (hwejang) shall be elected at the General Meeting of Shareholders among the managing officers under the provision of Article 35 of these Articles of Incorporation who are recommended by the President (hwejang) with the consent of the Board of Directors. the President (hwejang) may propose to the General Meeting of Shareholders with the consent of the Board of Directors the dismissal of any inside director even during his/her term of office, when any of the following event occurs. In this case, the inside directors other than the President (hwejang) shall not participate in the resolution of the Board of Directors:

1. Inability to perform his/her duties for a period not less than one (1) year due to his/her physical and/or mental disorders; or

2. Remarkably poor results of his/her business management due to deficient management abilities.

(4) Notwithstanding Paragraph 3 above, if the Board of Directors has recommended a candidate for the President (hwejang), the candidate for the President (hwejang) shall recommend candidates for the inside directors with the consent of the Board of Directors. Provided, however, that the candidate for the President (hwejang) is not elected as the President (hwejang) at the General Meeting of Shareholders, his recommendation of the candidacy for the inside directorship shall become null and void.

(5) Outside directors shall be elected by the General Meeting of Shareholders from among those who have professionalism and knowledge and are recommended by the Outside Director Recommendation Committee pursuant to Article 42 after considering any of the following criteria:

1. He/she has sufficient hands-on-background or professional knowledge in his/her relevant field such as information communications, finance, economy, management, accounting, or law that are necessary to perform his/her duties as an outside director;

2. He/she is not bound by special interest as an outside director and is able to fairly perform his/her duties for the benefit of KT and its shareholders;

3. He/she has a sense of ethics and responsibility that is fit to perform his/her duties as an outside director;

4. He/she is able to spare his/her time and efforts necessary to faithfully perform his/her duties as an outside director.

(6) Any person who falls under any of the following categories shall not become a director of KT, and upon any elected director of KT falling under any of the following categories, such director shall be dismissed:

1. Person who retired from his/her office within the last three (3) years due to his/her own faults or business responsibilities;

2. Person who is sentenced to imprisonment or more severe punishment, and three (3) years have not elapsed after the expiration of the execution of such imprisonment or determination not to execute such imprisonment;

3. Person who is currently under the suspension of pronouncement or suspension of execution, or who is sentenced to probation, and two (2) years have not elapsed after the expiration of the probation period;

(7) Any person who falls under any of the following disqualification criteria shall not become an outside director of KT, and any elected outside director shall be dismissed if he or she falls under any of the following disqualification criteria:

1. The same person and his or her related party as defined in the Monopoly Regulation and Fair Trade Act (“MRFTA”) who controls a company in competition with KT’s major business areas (however, with respect to the definition of competitor of KT used herein, if the company engages in the same business as KT and belongs to the same enterprise group of KT, such company is not deemed to be in competition with KT. This shall have the same meaning hereafter);

2. (Deleted)

3. (Deleted)

4. Any person who falls under the disqualification criteria under the Commercial Code of Korea and other relevant laws and regulations

Article 26. (Staggered Term of Office of Outside Director) One-third of the total number of the outside directors shall be elected every year.

Article 27. (Term of Office of Directors)

(1) The term of office of directors shall be not more than three (3) years; where the term of office expires before the closing date of the Ordinary General Meeting of Shareholders in the last fiscal year of such term, the term of office shall be extended to the closing date of such General Meeting.

(2) The aggregated term of office of an outside director shall be not more than ten (10) years. However, this shall not apply in the event that the extension of the term of office is determined by the proviso of paragraph 1.

Article 28. (By-election of Directors)

(1) In case of any vacancy in the office of a director, a director shall be elected to fill such vacancy at the General Meeting of Shareholders, provided that election thereof may not be made unless such vacancy results in lack of the requisite number of the directors or a difficulty in the administration of business.

(2) The term of office of an outside director elected to fill a vacancy shall be the remainder of the term of office of his/her predecessor.

Article 29. (Duties of the President (hwejang) and Directors)

(1) The President (hwejang) shall represent KT, execute businesses resolved by the Board of Directors and manage all businesses of KT. The Board of Directors shall determine the scope of duties and authorities of the Representative Director additionally elected through recommendation of the President (hwejang) in consideration of his/her necessity.

(2) Inside directors shall assist the President (hwejang) and shall perform their duties. In the event the President (hwejang) fails to perform his duties, an inside director shall perform his/her duties in accordance with the order as provided in the Office Regulation. However, in the event both the President (hwejang) and inside directors fail to perform their duties, a director shall perform his/her duties in accordance with the order as provided in the Office Regulation.

(3) If a director becomes aware of any event which may cause a material damage to KT, such director should immediately report to the Auditors’ Committee thereof.

Article 30. (Duties of Directors)

(1) Directors shall perform their duties faithfully for the good of KT in accordance with the applicable laws and regulations and the provisions of these Articles of Incorporation.

(2) The directors shall not disclose any business secret of KT that they obtained in the course of performance of their duties, during and after their terms of offices.

Article 31. (Remuneration and Severance Allowance for Directors)

(1) The Remuneration for the directors shall be determined by a resolution of the General Meeting of Shareholders, and such remuneration may be paid either in cash or in combination of cash and stock.

(2) The criteria for remuneration for the President (hwejang) and the inside directors, and the method of payment thereof shall be determined by a resolution of the Board of Directors, which shall be reported to the General Meeting of Shareholders.

(3) The President (hwejang) and the inside directors shall not participate in the resolution of the Board of Directors as set forth in Paragraph (2) above.

(4) Severance allowances for directors shall be paid in accordance with KT’s regulations for payment of officers’ severance allowance adopted at the General Meeting of Shareholders.

(5) The Outside directors may be reimbursed for expenses necessary for the performance of their duties.

Article 32. (President (hwejang) Candidate Examination Committee)

(1) KT shall organize the President (hwejang) Candidate Examination Committee in order to examine the President (hwejang) candidates subject to examination, which shall consist of all of the outside directors and one (1) inside director. However, any person who is elected as a member of the President (hwejang) Candidate Examination Committee shall not be a candidate for the President (hwejang), and the same shall apply in the event of serving a consecutive term.

(2) The President (hwejang) Candidate Examination Committee shall be organized by not later than three (3) months prior to the date of expiration of the term of office of the President (hwejang) (or before the elapse of within two (2) weeks from the date of retirement of the President (hwejang)) when such retirement is due to reasons other than the expiration of the term of office thereof), and shall be dissolved after the execution of management agreement between the President (hwejang) so elected and the chairman of the Board of Directors.

(3) The chairman of the President (hwejang) Candidate Examination Committee shall be elected by the Board of Directors from among its members who hold the position of outside directors of KT. In this case, the President (hwejang) and the inside directors shall not participate in the resolution of the Board of Directors.

(4) The Board of Directors shall, in consideration of the following requirements, determine the examination criteria for the examination of the President (hwejang) candidates and the President (hwejang) Candidate Examination Committee shall examine all of the President (hwejang) candidates on the basis of such criteria:

1. Experiences and scholastic achievements under which his/her knowledge with respect to the field of business management and economics can be evaluated in objective point of view;

2. Past business results and the management period of being in office under which his/her corporate management experience can be evaluated in objective point of view;

3. Any requirements to evaluate qualification and ability as a chief executive officer; and

4. Any requirements to evaluate professional knowledge and experience with respect to the telecommunications and related fields.

(5) The composition, operation and other details relating to the President (hwejang) Candidate Examination Committee shall be determined through the resolution of the Board of Directors.

Article 33. (Election of President (hwejang))

(1) President (hwejang) shall be elected from among CEO-qualified candidates who have a knowledge of management and economics or who have much managerial work experience.

(2) The Corporate Governance Committee, pursuant to paragraph 2 of Article 41 shall investigate and compose internal and external President (hwejang) candidate pool and shall select the President (hwejang) examination candidates in compliance with the decision of the Board of Directors.

(3) The President (hwejang) Candidate Examination Committee shall examine the President (hwejang) candidates selected under paragraph 2 in accordance with the examination criteria determined under paragraph 4 of Article 32, select the President (hwejang) candidates in compliance with the decision of the Board of the Directors and shall report to the Board of Directors the outcome of the examination thereof.

(4) The Board of Directors shall confirm one (1) person as the President (hwejang) candidate from the President (hwejang) candidates per paragraph 3 above and recommend such person so selected, to the General Shareholders’ Meeting.

(5) The Board of Directors shall, in confirming the president candidate, consult and decide with such candidates the terms of employment contract including the management goals.

(6) The Board of Directors shall recommend a president candidate to the General Shareholders’ Meeting and concurrently submit a draft employment contract.

(7) The President (hwejang) and the inside directors shall not participate in the resolution of the Board of Directors determining the terms of employment contract including the management goals pursuant to paragraph 5 above.

(8) The Board of Directors may decide upon matters not stipulated herein this Article and which concern the appointment and reappointment of the President (hwejang).

Article 34. (Execution of Employment Contract with the Candidate for President (hwejang))

(1) When the draft employment contract submitted pursuant to Paragraph 6 of Article 33 above is approved at the General Shareholders’ Meeting, KT shall enter into such management contract with the candidate for President (hwejang). In such case, the Chairman of the Board of Directors shall, on behalf of KT, sign the management contract.

(2) The Board of Directors may conduct a performance review to determine if the new President (hwejang) has performed his/her duties under the management contract as provided in Paragraph 1 or hire a professional evaluation agency for such purpose.

(3) When the Board of Directors determines, based on the result of performance review under the provision of Paragraph 2 above, that the new President (hwejang) has failed to achieve the management goal, it may propose to dismiss the President (hwejang) at the General Shareholders’ Meeting.

(4) The management goal shall include revenue increase, profitability improvement, investment plan and other related business objectives and shall be determined, on a yearly basis, at the Board of Directors’ Meeting in order to achieve the mid to long-term plans approved by the Board of Directors. Such management goal may be established on a numerical basis, if possible.

(5) The performance review prescribed in Paragraph 2 above, shall be conducted by the Board of Directors at the closing of each fiscal year or may be delegated by the Board of Directors to a professional evaluation agency; provided, however, that if the Board of Directors deems necessary, it may conduct the performance review during any fiscal year.

(6) The Board of Directors shall report the result of the performance review prescribed in Paragraph 2 above to the General Meeting of Shareholders.

(7) The President (hwejang) and the inside directors may not attend the Board of Directors’ Meeting for the resolution of the agenda prescribed in Paragraphs 2 through 4.

Article 35. (Managing Officers)

(1) For the efficient operation, KT shall have managing officers including inside directors.

(2) The managing officers shall consist of positions determined by the Board of Directors.

(3) The number and remuneration of the managing officers who do not hold the position of inside directors of KT shall be determined by the Board of Directors. The severance allowance for the said managing officers shall be paid in accordance with KT’s regulations for payment of officers’ severance allowance adopted at a General Meeting of Shareholders.

(4) Managing officers who do not hold the position of inside directors of KT shall be elected by the President (hwejang) of KT, whose term of office shall not exceed three (3) years.

(5) All matters concerning the respective duties of managing officers shall be determined by the President (hwejang).

Article 36. (Advisor, etc.) The President (hwejang) may employ an Advisor or appoint an Advisory Council in order to receive advice and suggestions regarding important matters concerning the operation of KT’s businesses.

CHAPTER VI. BOARD OF DIRECTORS

Article 37. (Organization and Operation)

(1) The Board of Directors shall consist of the directors, and shall resolve important matters related to the execution of business of KT as prescribed in the laws and regulations and these Articles of Incorporation, which were submitted by a director as an agenda.

(2) The Board of Directors’ Meeting shall be convened by each director. However, this shall not apply in the event that a director to convene the Board of Directors’ Meeting is determined by a resolution of the Board of Directors’ Meeting.

(3) The rest of directors may request the director designated under Paragraph 2 above to convene the Board of Directors’ Meeting. However, if the designated director refuses to convene the Board of Directors’ Meeting without any justifiable reason therefor, other directors may convene the Board of Directors’ Meeting.

(4) In convening a meeting of Board of Directors, the notice thereof shall be given at least three (3) days prior to the date set for such meeting to each director; provided, however, that the above procedure may be omitted with the consent of all of the directors.

(5) Matters necessary for the operation of the Board of Directors shall be set forth in the Regulations of the Board of Directors.

(6) For the efficient management of the Board of Directors, a self evaluation regarding the activities of the Board of Directors may be conducted, and detailed matters therefor, including the evaluation method, etc. shall be determined by a resolution of the Board of Directors.

Article 38. (Resolution and Delegation)

(1) A resolution at a meeting of Board of Directors shall be adopted by the presence of a majority of all directors in offices and by the affirmative votes of a majority of the directors present. However, the resolution on the sale of equity in any subsidiary of KT accompanying transfer of management rights, which is for more than 10 billion (10,000,000,000) Korean Won of the subsidiary’s equity, shall be adopted by affirmative votes of two-thirds (2/3) of the directors in office, and the resolution on the dismissal of the President shall be adopted by the affirmative votes of two-thirds (2/3) of the outside directors in offices.

(2) The Board of Directors may delegate part of its authorities to the President (hwejang).

Article 39. (Chairman)

(1) The chairman of the Board of Directors shall be elected from among the outside directors by a resolution of the Board of Directors.

(2) The term of office of the chairman shall be one (1) year.

Article 40. (Minutes of the Board of Directors) The proceeding and the result of meeting of the Board of Directors shall be recorded in the minutes, which shall bear the names, seals or signatures of the Chairman and the directors present at the meeting, and shall be kept at the head office.

Article 41. (Committees within the Board of Directors)

(1) The Board of Directors may have expert committees under its control by its resolution, in order to deliberate or decide with respect to the specific matters submitted to the Board of Directors.

1. President (hwejang) Candidate Examination Committee;

2. CG (Corporate Governance) Committee (the “CG Committee”);

3. Outside Director Candidates Recommendation Committee;

4. Audit Committee; and

5. Other Committees which the Board of Directors deems necessary.

(2) Any necessary matters, including those regarding the composition, authority or operation, of a committee under the Board of Directors described in Paragraph 1 above shall be determined by a resolution of the Board of Directors.

Article 41-2. (CG Committee)

(1) The CG Committee shall be composed of four (4) outside directors and one (1) inside director. However, the member of the Committee who belongs to the President (hwejang) candidate pool under paragraph 2 of Article 33 shall not participate in any resolution regarding the election of President (hwejang).

(2) The CG Committee shall deliberate and decide overall matters relating to the corporate governance of the Company.

(3) Specific issues, such as the operation of the CG Committee, shall be determined by a resolution of the Board of Directors.

Article 42. (Outside Director Candidates Recommendation Committee)

(1) The Outside Director Candidates Recommendation Committee shall consist of one (1) inside director and all of the outside directors; provided that in case of election of an outside director due to the expiration of the term of office of an outside director, the relevant outside director the expiration of whose term has caused the need for such election may not be a member of the Committee.

(2) The Outside Director Candidates Recommendation Committee shall recommend outside director candidates to the General Shareholders’ Meeting.

(3) Any other detailed matters regarding organization and operation of the Outside Director Candidates Recommendation Committee shall be determined by a resolution of the Board of Directors.

Article 43. (Audit Committee)

(1) The Audit Committee shall consist of not less than three (3) outside directors.

(2) The Audit Committee shall perform an audit of KT’s accounting books and records, and of other aspects of its business operations.

(3) Any other detailed matters regarding organization and operation of the Audit Committee shall be determined by a resolution of the Board of Directors.

Article 44. (Managing Officers’ Meeting)

(1) KT may convene managing officers’ meeting in order to consider and resolve matters delegated by the Board of Directors.

(2) Matters necessary for the organization and operation of the managing officers’ meeting set forth in Paragraph 1 above shall be determined by a resolution of the Board of Directors.

CHAPTER VII. ACCOUNTING

Article 45. (Fiscal Year) The fiscal year of KT shall be from January 1 to December 31 of each year.

Article 46. (Preparation, Submission and Maintenance of the Financial Statements)

(1) The President (hwejang) of KT shall prepare the following documents and supplementary documents thereto and the business report for each fiscal year, and submit such documents, after approved by the Board of Directors, to the Audit Committee, six (6) weeks prior to the date of the Ordinary General Meeting of Shareholders:

1. A balance sheet;

2. A statement of profit and loss; and

3. Other documents, as defined by the Commercial Code and enforcement ordinance, that reflect financial position and management performance of the company

4. Consolidated financial statements of the company

(2) The Audit Committee shall submit an auditor’s report to the President (hwejang) at least one (1) week before the General Shareholders’ Meeting.

(3) The President (hwejang) shall keep each document listed in Paragraph (1) together with the business report and the auditor’s report at the head office for a period of five (5) years, commencing from one week prior to the date of the Ordinary General Meeting of Shareholders. Certified copies of these documents shall be kept in each respective branch office for a period of three (3) years.

(4) The President (hwejang) shall submit each document listed in Paragraph (1) to the Ordinary General Meeting of Shareholders and request approval therefor. With respect to the business report, he/she shall report the contents thereof to the Ordinary General Meeting of Shareholders.

(5) When the approval of the General Meeting of Shareholders is obtained for the documents listed in Paragraph (1), the President (hwejang) shall, without delay, give a public notice of the balance sheet and the audit opinion thereon of an independent auditor.

Article 47. (Disposition of Profits) The unappropriated retained earnings for each fiscal year of KT shall be disposed of as following order:

1. Legal Reserves;

2. Other statutory reserves;

3. Amortization by way of the appropriation of the retained earnings;

4. Dividends; and

5. Voluntary reserve.

Article 48 (Retirement of Shares)

Pursuant to Article (165-3) of the FSCMA, KT may, by a resolution of the Board of Directors, retire the shares within the scope of profits attributable to the shareholders.

Article 49. (Payment of Dividends)

(1) Dividends may be paid either in cash or in shares.

(2) In case of stock dividends, if KT has issued several types of shares, different types of shares may be allotted by a resolution of the General Meeting of Shareholders.

(3) Pursuant to a resolution of the Board of Directors, KT may pay interim dividends in cash once during a fiscal year with June 30 as a base date (referred to as the fixed interim dividend date).

(4) The dividends referred to in Paragraphs (1) and (3) shall be paid to the shareholders or registered pledgees who are registered in the registry of shareholders as of the end of each fiscal year or as of the fixed interim dividend date.

(5) The rights to dividends shall be extinguished if it is not exercised within five (5) years from the date when the relevant dividend was declared, and such unclaimed dividends shall belong to KT.

CHAPTER VIII. SUPPLEMENTARY PROVISIONS

Article 50. (Guarantee of Personnel Status)

(1) Any employee of KT shall not receive a dismissal, suspension, reduction in compensation, reprimand and other disadvantageous orders, without any justifiable reasons therefor.

(2) The retirement age of company employees shall be as prescribe by THE ACT ON PROHIBITION OF AGE DISCRIMINATION IN EMPLOYMENT AND AGED EMPLOYMENT PROMOTION.

Article 51. (Publication of Management Information)

KT shall make public any and all matters deemed to be necessary for the promotion of transparency in management.

ADDENDUM

Article 1. (Enforcement Date) These Articles of Incorporation shall be effective from October 1, 1997.

Article 2. (Term of Office of the First President and Standing Directors) Notwithstanding Paragraph (1), Article (29) hereof, the term of office of the first President and the standing directors to be elected at the General Meeting of Shareholders convened after the execution of these Articles of Incorporation shall be extended until the end of the Ordinary General Meeting of Shareholders convened after the expiration of the said term of office.

Article 3. (Term of Office of First Non-Standing Director) (1) Pursuant to Article (3) of the Addenda of the Special Act, candidates for non-standing directors who are recommended by the Temporary Non-standing Directors Recommendation Committee shall be classified into three groups, i.e., first, second and third groups, which shall consist of one, two and three persons, respectively.

(2) Notwithstanding Article (29), Paragraph (1) hereof, the term of office of a non-standing director in the first group shall expire at the close of the first Ordinary General Meeting of Shareholders convened after one (1) year has elapsed. The term of office of non-standing directors in the second and third group shall expire at the close of the first Ordinary General Meetings of Shareholders convened after two (2) and three (3) years have elapsed, respectively.

Article 4. (Special Provisions for Term of Office of Standing Directors succeed to the Term of Office of an Executive Officer) In the event that a former executive officer who has been elected prior to the date of enforcement of these Articles of Incorporation is elected as a first standing director of KT after the enforcement of these Articles, his/her term of office may be shortened to the remainder of the term of office of an executive officer prior to the date of enforcement of these Articles of Incorporation.

ADDENDUM (December 8, 1997)

These articles of Incorporation shall be effective from the date of resolution of the general meeting of shareholders thereon.

ADDENDUM (September 18, 1998)

Article 1. (Enforcement Date) These Articles of Incorporation shall be effective from the date of resolution thereon of the general meetings of shareholders.

Article 2. (Interim Measures for the Acquisition of Shares of KT by Foreigners) Those provisions of Paragraph (3), Article (10) hereof shall not be applicable where Foreigners have acquired any shares of KT prior to the date of enforcement of these Articles of Incorporation pursuant to the relevant laws and regulations. In this regard, the number of shares so acquired shall be included in the maximum aggregate shareholdings ceiling prescribed in Item 1, Paragraph (2), Article (10) above.

ADDENDUM (March 19, 1999)

Article 1. (Enforcement Date) These Articles of Incorporation shall be effective from the date of resolution thereon of the general meetings of shareholders.

Article 2. (Interim Measure) The cumulative voting system provided for in Article (382-2) of the Commercial Code shall not apply until each of the requirements set forth in Paragraph (1), Article (21) of the Special Act has been satisfied.

ADDENDUM (March 24, 2000)

These Articles of Incorporation shall be effective from the date of resolution thereon of the general meeting of shareholders.

ADDENDUM (March 21, 2001)

These Articles of Incorporation shall be effective from the date of resolution thereon of the general meeting of shareholders.

ADDENDUM (March 22, 2002)

These Articles of Incorporation shall be effective as of the date of resolution of the general meeting of Shareholders.

ADDENDUM (August 20, 2002)

Article 1. (Enforcement Date) These Articles of Incorporation shall become effective from the date on which a resolution on the foregoing amendments is adopted at the General Meeting of Shareholders. Provided, however, that the amended provision of Article 41-3 shall become effective from the date following the day on which the first General Meeting of Shareholders is convened after enforcement of these amended Articles of Incorporation.

Article 2. (Interim Measures regarding Auditor) (1) The amended provisions regarding auditor of Articles 27, 28, 29, 30, 32, 33, 37 and 40 shall remain invalid, concurrently upon establishment of the Audit Committee.

(2) The term, “auditor” referred in Paragraph 3 of Article 31 and Article 44, shall be interpreted to be “Audit Committee”, respectively, concurrently upon establishment of the Audit Committee.

Article 3. (Interim Measures on Increase in Number of Outside Directors)

Notwithstanding the amended provision of Article 26, a candidate for outside director recommended by the Shareholders’ Committee established in accordance with the previous AOI, shall be deemed to have been recommended by the Outside Director Recommendation Committee, and the term of office of such additionally appointed outside director in the above shall be until the date on which the Ordinary General Meeting of Shareholders is held in the year of 2005.

ADDENDUM (March 14, 2003)

These Articles of Incorporation shall be effective from the date of resolution thereon of the general meeting of shareholders.

ADDENDUM (March 12, 2004)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 11, 2005)

These Articles of Incorporation shall become effective as of the date when the General Meeting of Shareholders resolved adoption hereof.

ADDENDUM (August 19, 2005)

These Articles of Incorporation shall take effect upon approval by the General Meeting of Shareholders.

ADDENDUM (March 10, 2006)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 16, 2007)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 27, 2009)

Article 1. (Enforcement Date) These Articles of Incorporation shall become effective upon resolution of the General Meeting of Shareholders approving the amendment hereof.

Article 2. (Interim Measure) The person who is “President (sajang)” as of the amendment date of these Articles of Incorporation will become the “President (hwejang)”, and in applying Article 32(1)-2 “ex-Presidents (sajang)” prior to the amendment date will be interpreted as “ex-Presidents (hwejang)”.

ADDENDUM (March 12, 2010)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 11, 2011)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 16, 2012)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders. Notwithstanding the foregoing, Clause 1 of Article 46, shall become effective as of April 15, 2012.

ADDENDUM (March 15, 2013)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 27, 2015)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 25, 2016)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 24, 2017)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 23, 2018)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

ADDENDUM (March 29, 2019)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders. Notwithstanding the foregoing, Clause 2 of Article 6, Article 13, Article 16-2 and Article 17, shall become effective as of September 16, 2019 when the Act on Electronic Registration of Stocks, Bonds, Etc. comes into effect.

EX-8.1

Exhibit 8.1

List of Subsidiaries of KT Corporation

(As of December 31, 2018)

Name	Jurisdiction of Incorporation
KT Powertel Co., Ltd.	Korea
KT Linkus Co., Ltd.	Korea
KT Submarine Co., Ltd.	Korea
KT Telecop Co., Ltd.	Korea
KT Hitel Co., Ltd.	Korea
KT Service Bukbu Co., Ltd.	Korea
KT Service Nambu Co., Ltd.	Korea
KT Commerce Inc.	Korea
KT Strategic Investment Fund No.1	Korea
KT Strategic Investment Fund No.2	Korea
KT Strategic Investment Fund No.3	Korea
KT Strategic Investment Fund No.4	Korea
BC-VP Strategic Investment Fund No.1	Korea
BC Card Co., Ltd.	Korea
VP Inc.	Korea
H&C Network	Korea
BC Card China Co., Ltd.	China
INITECH Co., Ltd.	Korea
Smartro Co., Ltd.	Korea
KTDS Co., Ltd.	Korea
KT M Hows Co., Ltd.	Korea
KT M&S Co., Ltd.	Korea
GENIE Music Corporation(KT Music Corporation)	Korea
KT MOS Bukbu Co., Ltd.	Korea
KT MOS Nambu Co., Ltd.	Korea
KT Skylife Co., Ltd.	Korea
Skylife TV Co., Ltd.	Korea
KT Estate Inc.	Korea
KT AMC Co., Ltd.	Korea
NEXR Co., Ltd.	Korea
KTSB Data service	Korea
KT Sat Co., Ltd.	Korea
Nasmedia, Co., Ltd.	Korea
KT Sports Co., Ltd	Korea
KT Music Contents Fund No.1	Korea

KT Music Contents Fund No.2	Korea
KT-Michigan Global Content Fund	Korea
Autopion Co., Ltd.	Korea
KTCS Corporation	Korea
KTIS Corporation	Korea
KT M mobile	Korea
KT Investment Co., Ltd.	Korea
Whowho&Company Co., Ltd.	Korea
PlayD Co., Ltd. (N Search Marketing Co., Ltd.)	Korea
Next connect PFV	Korea
KT Rwanda Networks Ltd.	Rwanda
AOS Ltd.	Rwanda
KT Belgium	Belgium
KT ORS Belgium	Belgium
Korea Telecom Japan Co., Ltd.	Japan
KBTO sp.zo.o.	Poland
Korea Telecom China Co., Ltd.	China
KT Dutch B.V	Netherlands
Super iMax LLC	Uzbekistan
East Telecom LLC	Uzbekistan
Korea Telecom America, Inc.	USA
PT. KT Indonesia	Indonesia
PT. BC Card Asia Pacific	Indonesia
KT Hongkong Telecommunications Co., Ltd.	Hong Kong
KT Hong Kong Limited	Hong Kong
Korea Telecom Singapore Pte. Ltd.	Singapore
Texnoprosistem LLP.	Uzbekistan
Nasmedia Thailand Company Limited	Thailand

EX-12.1

Exhibit 12.1

CERTIFICATION

I, Chang-Gyu Hwang, certify that:

1. I have reviewed this annual report on Form 20-F of KT Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: April 30, 2019

/s/ CHANG-GYU HWANG

Chang-Gyu Hwang

Chief Executive Officer

EX-12.2

Exhibit 12.2

CERTIFICATION

I, Kyung-Keun Yoon, certify that:

1. I have reviewed this annual report on Form 20-F of KT Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

4. The company’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the company and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5. The company’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of the company’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: April 30, 2019

/s/ KYUNG-KEUN YOON

Kyung-Keun Yoon

Executive Vice President and

Chief Financial Officer

EX-13.1

Exhibit 13.1

CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsection (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsection (a) and (b) of section 1350, chapter 63 of title 18, United States Code), the undersigned officer of KT Corporation, a corporation organized under the laws of the Republic of Korea (the “Company”), does hereby certify, to such officer’s knowledge, that:

The annual report on Form 20-F for the year ended December 31, 2018 (the “Form 20-F”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in the Form 20-F fairly presents, in all material respects, the financial condition and results of operation of the Company.

/s/ CHANG-GYU HWANG

Chang-Gyu Hwang

Chief Executive Officer

Date: April 30, 2019

/s/ KYUNG-KEUN YOON

Kyung-Keun Yoon

Executive Vice President and

Chief Financial Officer

Date: April 30, 2019

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to KT Corporation and will be retained by KT Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

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Document and Entity Information	12 Months Ended
	Dec. 31, 2018 shares
Document and entity information [abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	KT
Entity Registrant Name	KT Corporation
Entity Central Index Key	0000892450
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding	245,144,768

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Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Current assets
Cash and cash equivalents	₩ 2,703,422	₩ 1,928,182	₩ 2,900,311
Trade and other receivables, net	5,680,349	5,964,565	5,477,634
Other financial assets	994,780	972,631	720,555
Current income tax assets	4,046	9,030	2,079
Inventories, net	1,074,634	642,027	454,588
Current assets held for sale	13,035	7,230
Other current assets	1,687,548	304,860	311,135
Current assets	12,157,814	9,828,525	9,866,302
Non-current assets
Trade and other receivables, net	842,995	828,832	709,011
Other financial assets	623,176	754,992	664,726
Property and equipment, net	13,068,257	13,562,319	14,312,111
Investment properties, net	1,091,084	1,189,531	1,148,044
Intangible assets, net	3,407,123	2,632,704	3,022,803
Investments in associates and joint ventures	272,407	279,431	284,075
Deferred income tax assets	465,369	712,222	701,409
Other non-current assets	545,895	107,165	106,099
Non-current assets	20,316,306	20,067,196	20,948,278
Total assets	32,474,120	29,895,721	30,814,580
Current liabilities
Trade and other payables	7,007,515	7,426,088	7,141,725
Borrowings	1,368,481	1,573,474	1,820,001
Other financial liabilities	942	37,224	233
Current income tax liabilities	249,837	82,984	102,843
Provisions	117,881	78,172	96,485
Deferred revenue	52,878	17,906	35,617
Other current liabilities	596,589	258,314	342,291
Current liabilities	9,394,123	9,474,162	9,539,195
Non-current liabilities
Trade and other payables	1,513,864	1,001,369	1,188,311
Borrowings	5,279,812	5,110,188	6,300,790
Other financial liabilities	163,454	149,267	108,431
Defined benefit liabilities, net	561,269	395,079	378,404
Provisions	163,995	124,858	100,694
Deferred revenue	110,702	91,698	85,372
Deferred income tax liabilities	204,785	128,462	137,680
Other non-current liabilities	423,626	237,284	58,761
Non-current liabilities	8,421,507	7,238,205	8,358,443
Total liabilities	17,815,630	16,712,367	17,897,638
Equity
Share capital	1,564,499	1,564,499	1,564,499
Share premium	1,440,258	1,440,258	1,440,258
Retained earnings	11,256,069	9,961,150	9,778,707
Accumulated other comprehensive income	50,158	30,985	(1,432)
Other components of equity	(1,181,083)	(1,205,302)	(1,217,934)
Equity attributable to owners of the Controlling Company	13,129,901	11,791,590	11,564,098
Non-controlling interest	1,528,589	1,391,764	1,352,844
Total equity	14,658,490	13,183,354	12,916,942
Total liabilities and equity	₩ 32,474,120	₩ 29,895,721	₩ 30,814,580

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Consolidated Statements of Operations - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit or loss [abstract]
Operating revenue	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202
Revenue	23,220,052	23,259,541	22,798,330
Others	215,998	287,388	365,872
Operating expenses	22,335,190	22,477,837	21,781,098
Operating profit	1,100,860	1,069,092	1,383,104
Finance income	374,243	406,328	296,139
Finance costs	(435,659)	(644,531)	(515,087)
Share of net profit (losses) of associates and joint venture	(5,467)	(13,892)	2,599
Profit before income tax	1,033,977	816,997	1,166,755
Income tax expense	314,565	270,656	334,910
Profit for the year	719,412	546,341	831,845
Profit for the year attributable to:
Profit (loss) for the year attributable to Owners of the Controlling Company	645,571	461,559	745,090
Profit (loss) for the year attributable to Non-controlling interest	₩ 73,841	₩ 84,782	₩ 86,755
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	₩ 2,634	₩ 1,884	₩ 3,043
Diluted earnings per share	₩ 2,634	₩ 1,883	₩ 3,041

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Consolidated Statements of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [abstract]
Profit for the year	₩ 719,412	₩ 546,341	₩ 831,845
Other comprehensive income Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability	(73,511)	(83,962)	4,213
Shares of remeasurement gain (loss) of associates and joint ventures	(816)	(115)	116
Gain on valuation of equity instruments at fair value through other comprehensive income	43,077
Other comprehensive income, Items that may be subsequently reclassified to profit or loss:
Gain on valuation of debt instruments at fair value through other comprehensive income	734
Changes in value of available-for-sale financial assets		51,235	10,925
Other comprehensive income from available-for sale financial assets reclassified to loss		(55,450)	(3,840)
Valuation gain (loss) on cash flow hedge	17,268	(111,083)	64,796
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)	(44,279)	141,929	(75,871)
Share of other comprehensive income (loss) from associates and joint ventures	(41)	10,280	(602)
Exchange differences on translation of foreign operations	2,940	(21,122)	(5,407)
Total other comprehensive loss	(54,628)	(68,288)	(5,670)
Total comprehensive income for the year	664,784	478,053	826,175
Total comprehensive income for the year attributable to:
Owners of the Controlling Company	589,179	413,149	738,413
Non-controlling interest	75,605	64,904	87,762
Total comprehensive income for the year	₩ 664,784	₩ 478,053	₩ 826,175

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Consolidated Statements of Changes in Equity - KRW (₩) ₩ in Millions	Total	Share capital [member]	Share premium [member]	Retained earnings [member]	Accumulated other comprehensive income [member]	Other components of equity [member]	Total attributable to owners of the Controlling Company [member]	Non-controlling interest [member]
Beginning balance (As previously reported [member]) at Dec. 31, 2015	₩ 12,156,131	₩ 1,564,499	₩ 1,440,258	₩ 9,049,971	₩ 13,870	₩ (1,232,863)	₩ 10,835,735	₩ 1,320,396
Beginning balance (Adjusted [member]) at Dec. 31, 2015	97,496			97,496			97,496
Beginning balance at Dec. 31, 2015	12,253,627	1,564,499	1,440,258	9,147,467	13,870	(1,232,863)	10,933,231	1,320,396
Comprehensive income
Profit for the year | As previously reported [member]	795,117
Profit for the year	831,845			745,090			745,090	86,755
Changes in value of available-for-sale financial assets	7,085				1,691		1,691	5,394
Remeasurements of net defined benefit liability	4,213			8,531			8,531	(4,318)
Shares of remeasurement gain (loss) of associates and joint ventures	116			94			94	22
Shares of other comprehensive income (losses) of joint ventures and associates	(602)				(571)		(571)	(31)
Valuation gains (losses) on cashflow hedge	(11,075)				(11,075)		(11,075)
Exchange differences on translation of foreign operations	(5,407)				(5,347)		(5,347)	(60)
Total comprehensive income for the year | As previously reported [member]	789,447
Total comprehensive income for the year	826,175			753,715	(15,302)		738,413	87,762
Transactions with equity holders
Dividends paid by the Controlling Company	(122,425)			(122,425)			(122,425)
Dividends paid to non-controlling interest of subsidiaries	(61,674)							(61,674)
Changes in consolidation scope	(4,181)					11,369	11,369	(15,550)
Change in ownership interest in subsidiaries				(50)		50
Appropriation of loss on disposal of treasury stock	21,769							21,769
Others	3,651					3,510	3,510	141
Subtotal	(162,860)			(122,475)		14,929	(107,546)	(55,314)
Ending balance at Dec. 31, 2016	12,916,942	1,564,499	1,440,258	9,778,707	(1,432)	(1,217,934)	11,564,098	1,352,844
Comprehensive income
Profit for the year	546,341			461,559			461,559	84,782
Changes in value of available-for-sale financial assets	(4,215)				(1,433)		(1,433)	(2,782)
Remeasurements of net defined benefit liability	(83,962)			(80,711)			(80,711)	(3,251)
Shares of remeasurement gain (loss) of associates and joint ventures	(115)			(116)			(116)	1
Shares of other comprehensive income (losses) of joint ventures and associates	10,280				10,148		10,148	132
Valuation gains (losses) on cashflow hedge	30,846				30,846		30,846
Exchange differences on translation of foreign operations	(21,122)				(7,144)		(7,144)	(13,978)
Total comprehensive income for the year	478,053			380,732	32,417		413,149	64,904
Transactions with equity holders
Dividends paid by the Controlling Company	(195,977)			(195,977)			(195,977)
Dividends paid to non-controlling interest of subsidiaries	(47,162)							(47,162)
Changes in consolidation scope	250							250
Change in ownership interest in subsidiaries	26,683					5,441	5,441	21,242
Appropriation of loss on disposal of treasury stock				(2,312)		2,312
Others	4,565					4,879	4,879	(314)
Subtotal	(211,641)			(198,289)		12,632	(185,657)	(25,984)
Ending balance (As previously reported [member]) at Dec. 31, 2017	13,049,130
Ending balance (Adjusted [member]) at Dec. 31, 2017	14,232,276	1,564,499	1,440,258	10,915,203	48,726	(1,205,302)	12,763,384	1,468,892
Ending balance (Increase (decrease) due to changes in accounting policy required by IFRSs [member]) at Dec. 31, 2017	1,048,922			954,053	17,741		971,794	77,128
Ending balance at Dec. 31, 2017	13,183,354	1,564,499	1,440,258	9,961,150	30,985	(1,205,302)	11,791,590	1,391,764
Comprehensive income
Profit for the year | As previously reported [member]	668,409
Profit for the year | Adjusted [member]	719,412
Profit for the year	719,412			645,571			645,571	73,841
Remeasurements of net defined benefit liability	(73,511)			(61,449)			(61,449)	(12,062)
Shares of remeasurement gain (loss) of associates and joint ventures	(816)			(816)			(816)
Shares of other comprehensive income (losses) of joint ventures and associates	(41)				(136)		(136)	95
Valuation gains (losses) on cashflow hedge	(27,011)				(27,011)		(27,011)
Gain(loss) on disposal of equity instruments at fair value through other comprehensive income				4,441	(4,441)
Gain on valuation of financial instruments at fair value through other comprehensive income	43,811				30,731		30,731	13,080
Exchange differences on translation of foreign operations	2,940				2,289		2,289	651
Total comprehensive income for the year	664,784			587,747	1,432		589,179	75,605
Transactions with equity holders
Dividends paid by the Controlling Company	(245,097)			(245,097)			(245,097)
Dividends paid to non-controlling interest of subsidiaries	(53,535)							(53,535)
Changes in consolidation scope	(1,701)					(1,803)	(1,803)	102
Change in ownership interest in subsidiaries	48,589					11,118	11,118	37,471
Appropriation of loss on disposal of treasury stock				(2,046)		2,046
Disposal of treasury stock	9,547					9,547	9,547
Others	3,627			262		3,311	3,573	54
Subtotal	(238,570)			(246,881)		24,219	(222,662)	(15,908)
Ending balance (As previously reported [member]) at Dec. 31, 2018	13,608,698
Ending balance at Dec. 31, 2018	₩ 14,658,490	₩ 1,564,499	₩ 1,440,258	₩ 11,256,069	₩ 50,158	₩ (1,181,083)	₩ 13,129,901	₩ 1,528,589

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Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Cash generated from operations	₩ 4,212,222	₩ 4,318,884	₩ 5,202,520
Interest paid	(304,428)	(252,405)	(372,525)
Interest received	242,951	93,769	104,679
Dividends received	14,074	10,843	10,824
Income tax paid	(154,355)	(293,342)	(174,748)
Net cash inflow from operating activities	4,010,464	3,877,749	4,770,750
Cash flows from investing activities
Collection of loans	64,023	55,190	47,887
Loans granted	(60,229)	(59,800)	(57,400)
Disposal of financial assets at fair value through profit or loss	397,224
Disposal of financial assets at amortized cost	255,290
Disposal of financial assets at fair value through other comprehensive income	2,474
Disposal of assets held-for-sale	9,842
Disposal of available-for-sale financial assets		146,429	35,791
Acquisition of available-for-sale financial assets		(89,027)	(44,302)
Disposal of investments in associates and joint ventures	7,832	59,818	11,074
Acquisition of investments in associates and joint ventures	(34,420)	(41,780)	(38,675)
Disposal of current and non-current financial instruments		645,686	293,283
Acquisition of current and non-current financial instruments		(1,231,917)	(597,345)
Disposal of property and equipment, and investment properties	90,992	68,229	93,401
Acquisition of property and equipment, and investment properties	(2,260,879)	(2,442,223)	(2,764,346)
Acquisition of financial assets at fair value through profit or loss	(158,787)
Acquisition of financial assets at amortized cost	(248,789)
Acquisition of financial assets at fair value through other comprehensive income	(16,239)
Disposal of intangible assets	20,037	22,680	17,891
Acquisition of intangible assets	(746,213)	(613,556)	(455,763)
Decrease in cash due to business combination, etc.	(26,288)	(2,974)	(26,454)
Net cash outflow from investing activities	(2,704,130)	(3,483,245)	(3,484,958)
Cash flows from financing activities
Proceeds from borrowings and debentures	1,473,016	616,257	1,122,898
Repayments of borrowings and debentures	(1,612,731)	(1,780,174)	(1,768,768)
Settlement of derivative assets and liabilities, net	(3,461)	71,370	(33,199)
Cash inflow from consolidated capital transactions		27,261	800
Cash outflow from consolidated capital transactions	(5,506)	(300)	(5,140)
Cash inflow from other financing activities	13,939	16,962
Dividends paid to shareholders	(298,632)	(243,140)	(184,099)
Acquisition of treasury stock	(24,415)
Decrease in finance leases liabilities	(73,885)	(71,735)	(75,763)
Net cash outflow from financing activities	(531,675)	(1,363,499)	(943,271)
Effect of exchange rate change on cash and equivalents	581	(3,134)	(1,674)
Net increase (decrease) in cash and cash equivalents	775,240	(972,129)	340,847
Cash and cash equivalents at beginning of year	1,928,182	2,900,311	2,559,464
Cash and cash equivalents at end of year	₩ 2,703,422	₩ 1,928,182	₩ 2,900,311

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General Information

12 Months Ended

Dec. 31, 2018

Text block [abstract]

General Information

1. General Information

The consolidated financial statements include the accounts of KT Corporation, which is the controlling company as defined under IFRS 10, Consolidated Financial Statements, and its 63 controlled subsidiaries as described in Note 1.2 (collectively referred to as the “Group”).

1.1 The Controlling Company

KT Corporation (the “Controlling Company”) commenced operations on January 1, 1982, when it spun off from the Korea Communications Commission (formerly the Korean Ministry of Information and Communications) to provide telephone services and to engage in the development of advanced communications services under the Act of Telecommunications of Korea. The headquarters are located in Seongnam City, Gyeonggi Province, Republic of Korea, and the address of its registered head office is 90, Buljeong-ro, Bundang-gu, Seongnam City, Gyeonggi Province.

On October 1, 1997, upon the announcement of the Government-Investment Enterprises Management Basic Act and the Privatization Law, the Controlling Company became a government-funded institution under the Commercial Code of Korea.

On December 23, 1998, the Controlling Company’s shares were listed on the Korea Exchange.

On May 29, 1999, the Controlling Company issued 24,282,195 additional shares and issued American Depository Shares (ADS), representing new shares and 20,813,311 government-owned shares, at the New York Stock Exchange. On July 2, 2001, the additional ADS representing 55,502,161 government-owned shares were issued at the New York Stock Exchange.

In 2002, the Controlling Company acquired the entire government-owned shares in accordance with the Korean government’s privatization plan. As at the end of the reporting period, the Korean government does not own any share in the Controlling Company.

1.2 Consolidated Subsidiaries

The consolidated subsidiaries as at December 31, 2017 and 2018, are as follows:

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
KT Powertel Co., Ltd.2	Trunk radio system business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	91.4%	92.4%	December
KT Submarine Co., Ltd.2, 4	Submarine cable construction and maintenance	Korea	39.3%	39.3%	December
KT Telecop Co., Ltd.	Security service	Korea	86.8%	86.8%	December
KT Hitel Co., Ltd.	Data communication	Korea	67.1%	67.1%	December
KT Service Bukbu Co., Ltd.	Opening services of fixed line	Korea	67.3%	67.3%	December
KT Service Nambu Co., Ltd.	Opening services of fixed line	Korea	77.3%	77.3%	December
KT Commerce Inc.	B2C, B2B service	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.1	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.2	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.3	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.4	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	—	100.0%	December
BC Card Co., Ltd.	Credit card business	Korea	69.5%	69.5%	December
VP Inc.	Payment security service for credit card, others	Korea	50.9%	50.9%	December
H&C Network	Call centre for financial sectors	Korea	100.0%	100.0%	December
BC Card China Co., Ltd.	Software development and data processing	China	100.0%	100.0%	December
INITECH Co., Ltd.4	Internet banking ASP and security solutions	Korea	58.2%	58.2%	December
Smartro Co., Ltd.	VAN (Value Added Network) business	Korea	81.1%	81.1%	December
KTDS Co., Ltd.4	System integration and maintenance	Korea	95.5%	95.5%	December
KT M Hows Co., Ltd.	Mobile marketing	Korea	90.0%	90.0%	December
KT M&S Co., Ltd.	PCS distribution	Korea	100.0%	100.0%	December
GENIE Music Corporation(KT Music Corporation)2	Online music production and distribution	Korea	42.5%	36.0%	December
KT MOS Bukbu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	100.0%	December
KT MOS Nambu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	98.4%	December
KT Skylife Co., Ltd.4	Satellite broadcasting business	Korea	50.3%	50.3%	December
Skylife TV Co., Ltd.	TV contents provider	Korea	92.6%	92.6%	December
KT Estate Inc.	Residential building development and supply	Korea	100.0%	100.0%	December
KT AMC Co., Ltd.	Asset management and consulting services	Korea	100.0%	100.0%	December
NEXR Co., Ltd.	Cloud system implementation	Korea	100.0%	100.0%	December
KTSB Data service	Data centre development and related service	Korea	51.0%	51.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3	Online advertisement	Korea	42.8%	42.8%	December
KT Sports Co., Ltd	Management of sports group	Korea	100.0%	100.0%	December
KT Music Contents Fund No.1	Music contents investment business	Korea	80.0%	80.0%	December
KT Music Contents Fund No.2	Music contents investment business	Korea	100.0%	100.0%	December
KT-Michigan Global Content Fund	Content investment business	Korea	88.6%	88.6%	December
Autopion Co., Ltd.	Service for information and communication	Korea	100.0%	100.0%	December
KTCS Corporation2,4	Database and online information provider	Korea	30.9%	30.9%	December
KTIS Corporation2,4	Database and online information provider	Korea	30.1%	30.1%	December
KT M mobile	Special category telecommunications operator and sales of communication device	Korea	100.0%	100.0%	December
KT Investment Co., Ltd.	Technology business finance	Korea	100.0%	100.0%	December
Whowho&Company Co., Ltd.	Software development and supply	Korea	100.0%	100.0%	December
PlayD Co., Ltd. (N Search Marketing Co., Ltd.)	Advertising agency business	Korea	100.0%	100.0%	December
Next connect PFV	Residential building development and supply	Korea	—	100.0%	December
KT Rwanda Networks Ltd.	Network installation and management	Rwanda	51.0%	51.0%	December
AOS Ltd.	System integration and maintenance	Rwanda	51.0%	51.0%	December
KT Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
KT ORS Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.zo.o.	Electronic communication business	Poland	94.3%	96.2%	December
Korea Telecom China Co., Ltd.	Foreign telecommunication business	China	100.0%	100.0%	December
KT Dutch B.V.	Super iMax and East Telecom management	Netherlands	100.0%	100.0%	December
Super iMax LLC	Wireless high speed internet business	Uzbekistan	100.0%	100.0%	December
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.0%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. KT Indonesia	Foreign telecommunication business	Indonesia	99.0%	99.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hongkong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
KT Hong Kong Limited	Foreign investment business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December
Texnoprosistem LLP	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Company Limited	Internet advertising solution	Thailand	—	99.9%	December

1 Sum of the ownership interests owned by the Controlling Company and subsidiaries.

2 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company can exercise the majority voting rights in its decision-making process at all times considering the historical voting pattern at the shareholders’ meetings.

3 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company holds the majority of voting right based on an agreement with other investors.

4 The number of subsidiaries’ treasury stock is deducted from the total number of shares when calculating the controlling percentage ownership.

Changes in scope of consolidation in 2018 are as follows:

Changes	Location	Subsidiary	Reason
Included	Korea	BC-VP Strategic Investment Fund No.1	Newly established
	Korea	KT MOS Bukbu Co., Ltd.	Acquisition
	Korea	KT MOS Nambu Co., Ltd.	Acquisition
	Korea	Next connect PFV	Newly established
	Thailand	Nasmedia Thailand Company Limited	Newly established
Excluded	Korea	KT New Business Fund No.1	Liquidated

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2016, 2017 and 2018, follows:

(In millions of Korean won)	2016
	Total assets		Total liabilities		Operating revenues		Profit (loss) For the year
KT Powertel Co., Ltd.	￦	113,725	￦	19,899	￦	81,390	￦	202
KT Linkus Co., Ltd.		64,318		56,953		117,587		(3,830	)
KT Submarine Co., Ltd.		156,993		55,573		84,137		5,146
KT Telecop Co., Ltd.		265,553		132,344		315,948		143
KT Hitel Co., Ltd.		249,202		46,941		198,994		4,298
KT Service Bukbu Co., Ltd.		32,863		24,580		182,952		694
KT Service Nambu Co., Ltd.		32,621		24,282		218,602		772
BC Card Co., Ltd.1		3,651,065		2,602,404		3,567,512		163,131
H&C Network1		272,110		80,983		266,613		14,749
Nasmedia Co., Ltd.1		263,925		159,502		70,037		11,972
KTDS Co., Ltd.1		197,970		151,644		476,379		10,838
KT M Hows Co., Ltd.		28,539		18,466		19,922		2,865
KT M&S Co., Ltd.		247,854		227,507		724,144		(12,955	)
GENIE Music Corporation(KT Music Corporation)		110,080		41,953		111,450		8,235
KT Skylife Co., Ltd.1		777,948		231,452		668,945		68,863
KT Estate Inc.1		1,734,729		375,341		405,417		46,815
KTSB Data service		20,075		759		5,136		(1,983	)
KT Innoedu Co., Ltd.		6,477		7,259		15,599		103
KT Sat Co., Ltd.		744,653		253,041		144,594		36,266
KT Sports		16,925		13,573		48,476		(198	)
KT Music Contents Fund No.1		10,592		331		349		103
KT-Michigan Global Content Fund		16,250		163		133		(514	)
Autopion Co., Ltd.		6,163		2,794		7,772		(409	)
KT M mobile		131,446		20,369		112,532		(40,041	)
KT Investment Co., Ltd.1		39,506		23,123		10,130		(1,832	)
NgeneBio		6,361		4,733		244		(1,833	)
KTCS Corporation1		322,768		166,642		955,050		7,892
KTIS Corporation		221,176		63,871		436,914		9,991
Korea Telecom Japan Co., Ltd.		3,592		5,374		5,122		(1,391	)
Korea Telecom China Co., Ltd.		532		188		930		60
KT Dutch B.V.		34,197		73		166		85
Super iMax LLC		10,308		6,734		10,759		(1,802	)
East Telecom LLC		31,885		16,554		27,492		3,257
Korea Telecom America, Inc.		4,464		1,306		7,113		181
PT. KT Indonesia		16		—		—		(7	)
KT Rwanda Networks Ltd.		167,112		138,651		13,435		(31,455	)
KT Belgium		79,391		7		—		(67	)
KT ORS Belgium		2,013		23		—		(46	)
KBTO sp.zo.o.		1,166		2,378		21		(2,587	)
AOS Ltd.		10,025		3,179		14,481		(1,123	)
KT Hongkong Telecommunications Co., Ltd.		1,571		956		1,568		120

(In millions of Korean won)	2017
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	115,125	￦	18,937	￦	69,234	￦	2,112
KT Linkus Co., Ltd.		59,344		51,516		112,043		725
KT Submarine Co., Ltd.		142,797		34,056		73,985		8,243
KT Telecop Co., Ltd.		264,353		131,633		317,591		2,885
KT Hitel Co., Ltd.		258,240		52,943		227,884		3,225
KT Service Bukbu Co., Ltd.		29,281		22,096		194,837		688
KT Service Nambu Co., Ltd.		36,076		26,412		232,996		875
BC Card Co., Ltd.1		4,048,263		2,955,038		3,628,995		156,109
H&C Network1		273,856		65,446		277,622		16,104
Nasmedia Co., Ltd.1		315,967		188,197		120,667		26,676
KTDS Co., Ltd.1		144,922		93,343		459,266		11,584
KT M Hows Co., Ltd.		42,738		28,489		24,610		4,097
KT M&S Co., Ltd.		242,388		231,151		734,420		(9,707	)
GENIE Music Corporation (KT Music Corporation)		139,686		48,512		156,163		(3,401	)
KT Skylife Co., Ltd.1		792,893		210,550		687,752		57,314
KT Estate Inc.1		1,869,194		502,915		428,446		52,416
KTSB Data service		18,306		605		4,950		(1,651	)
KT Sat Co., Ltd.		742,391		220,804		147,649		29,601
KT Sports		11,131		7,805		53,357		(199	)
KT Music Contents Fund No.1		13,804		1,041		370		(499	)
KT Music Contents Fund No.2		7,500		11		—		(11	)
KT-Michigan Global Content Fund		14,575		147		159		(426	)
Autopion Co., Ltd.		6,306		3,530		6,679		(618	)
KT M mobile		93,601		21,453		159,684		(38,883	)
KT Investment Co., Ltd.1		54,673		38,313		8,794		(619	)
KTCS Corporation1		348,334		188,764		968,186		7,385
KTIS Corporation		223,818		62,569		438,597		8,337
Korea Telecom Japan Co., Ltd.1		1,554		2,788		2,772		536
Korea Telecom China Co., Ltd.		665		32		1,030		348
KT Dutch B.V.		30,312		50		206		169
Super iMax LLC		3,449		4,886		7,314		(4,584	)
East Telecom LLC1		11,672		11,748		19,663		(9,118	)
Korea Telecom America, Inc.		3,694		791		6,783		109
PT. KT Indonesia		8		—		—		(6	)
KT Rwanda Networks Ltd.2		151,359		139,561		15,931		(22,762	)
KT Belgium		86,455		8		49		(2	)
KT ORS Belgium		1,769		14		10		(10	)
KBTO sp.zo.o.		3,311		2,268		67		(3,456	)
AOS Ltd.2		9,437		4,519		8,952		(682	)
KT Hongkong Telecommunications Co., Ltd.		2,578		1,497		7,304		494

(In millions of Korean won)	2018
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	124,064	￦	28,217	￦	65,620	￦	(5,545	)
KT Linkus Co., Ltd.		54,147		44,895		106,337		1,216
KT Submarine Co., Ltd.		130,715		27,530		61,652		(4,286	)
KT Telecop Co., Ltd.		272,492		140,314		328,262		166
KT Hitel Co., Ltd.		272,708		66,043		279,117		657
KT Service Bukbu Co., Ltd.		30,599		23,964		195,961		(31	)
KT Service Nambu Co., Ltd.		37,452		27,939		230,088		160
BC Card Co., Ltd.1		3,722,379		2,630,536		3,551,715		70,889
H&C Network1		245,841		63,188		297,470		(15,944	)
Nasmedia Co., Ltd.1		303,112		161,164		106,805		20,596
KTDS Co., Ltd.1		148,675		95,834		434,302		8,586
KT M Hows Co., Ltd.		60,197		42,386		26,673		3,691
KT M&S Co., Ltd.		228,073		207,740		791,652		11,408
GENIE Music Corporation (KT Music Corporation)		221,559		75,827		171,314		6,374
KT MOS Bukbu Co., Ltd.		14,121		10,571		16,543		(782	)
KT MOS Nambu Co., Ltd.		14,313		8,927		14,941		(2,418	)
KT Skylife Co., Ltd.1		816,001		149,841		694,059		52,010
KT Estate Inc.1		1,695,995		304,712		569,269		51,854
KTSB Data service		8,632		523		4,627		(9,576	)
KT Sat Co., Ltd.		685,926		173,513		137,186		4,921
KT Sports Co., Ltd.		9,560		6,376		55,565		(154	)
KT Music Contents Fund No.1		14,092		1,035		559		294
KT Music Contents Fund No.2		7,629		281		150		(142	)
KT-Michigan Global Content Fund		12,741		—		869		(670	)
Autopion Co., Ltd.		8,838		5,801		12,035		453
KT M mobile		146,334		35,335		172,674		(10,085	)
KT Investment Co., Ltd.1		74,580		58,040		8,095		247
KTCS Corporation1		350,280		188,561		1,019,787		11,401
KTIS Corporation		229,246		68,997		451,532		7,900
Next connect PFV		385,769		34,370		143		(12,449	)
Korea Telecom Japan Co., Ltd.1		1,326		2,910		1,965		(126	)
Korea Telecom China Co., Ltd.		661		22		681		10
KT Dutch B.V.		31,693		41		191		105
Super iMax LLC		4,150		4,528		4,845		(424	)
East Telecom LLC1		16,590		14,263		15,087		2,639
Korea Telecom America, Inc.		4,218		832		7,554		350
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		144,129		162,801		15,150		(29,238	)
KT Belgium		90,172		1		29		(43	)
KT ORS Belgium		6,709		5		—		(46	)
KBTO sp.zo.o.		1,364		217		202		(3,771	)
AOS Ltd.2		14,018		4,952		6,300		(680	)
KT Hongkong Telecommunications Co., Ltd.		3,616		2,143		9,990		351

1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements.

2 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities.

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Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Significant Accounting Policies

2. Significant Accounting Policies

The principal accounting policies applied in the preparation of these consolidated financial statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated.

2.1 Basis of Preparation

The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. It also requires management to exercise judgment in the process of applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 3.

Correction (“revision”) of prior financial statements

During the year 2018, the Group identified errors related to prior years in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system. Pursuant to the guidance of Staff Accounting Bulletin (“SAB”) No. 99, “Materiality”, the Group evaluated the materiality of the misstatement quantitatively and qualitatively and has concluded that the amounts of misstatement were not material to its annual prior periods financial statements or trends of financial results. However, because of the significance of the cumulative out-of-period adjustment to the 2018 fiscal year, the financial statements for years prior to 2018 fiscal year have been revised in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements”. See Note 43 for further details on the impact of the revision.

2.2 Changes in Accounting Policy and Disclosures

(1) New and amended standards adopted by the Group

The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2018, and the application has following impacts on the consolidated financial statements.

- Amendments to IAS 28 Investments in Associates and Joint Ventures

When an investment in an associate or a joint venture is held by, or is held indirectly through, an entity that is a venture capital organization, or a mutual fund, unit trust and similar entities including investment-linked insurance funds, the entity may elect to measure each investment separately at fair value through profit or loss in accordance with IFRS 9. The amendment does not have a significant impact on the financial statements because the Group is not a venture capital organization.

- Amendments to IAS 40 Transfers of Investment Property

The amendment to IAS 40 clarifies that a transfer to, or from, investment property, including property under construction, can only be made if there has been a change in use that is supported by evidence, and the list of evidence for a change of use in the standard was re-characterized as a non-exclusive list of example. The amendment does not have a significant impact on the financial statements.

- Amendments to IFRS 2 Share-based Payment

Amendments to IFRS 2 clarify accounting for a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. Amendments also clarify that the measurement approach should treat the terms and conditions of a cash-settled award in the same way as for an equity-settled award. The amendment does not have a significant impact on the financial statements.

- Enactment of IFRIC 22 Foreign Currency Transaction and Advance Consideration

According to the enactment, the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income (or part of it) is the date on which an entity initially recognizes the non-monetaryasset or non-monetary liability arising from the payment or receipt of advance consideration. The enactment does not have a significant impact on the financial statements.

- IFRS 9 Financial Instruments

The Group has applied IFRS 9 Financial Instruments on January 1, 2018, the date of initial application. In accordance with the transitional provisions in IFRS 9, comparative figures have not been restated, and the differences between previous book amounts and book amounts at the date of initial application are recognized to retained earnings. See Note 41 for further details on the impact of the application of the standard.

- IFRS 15 Revenue from Contracts with Customers

The Group has applied IFRS 15 Revenue from Contracts with Customers. In accordance with the transition provisions in IFRS 15, comparative figures have not been restated. The Group elected the modified retrospective approach, and recognized the cumulative impact of initially applying the revenue standard as an adjustment to retained earnings as at January 1, 2018, the period of initial application. See Note 41 for further details on the impact of the application of the standard.

(2) New standards and interpretations not yet adopted by the Group

Certain new accounting standards and interpretations that have been published that are not mandatory for annual reporting period commencing January 1, 2018 and have not been early adopted by the Group are set out below.

- Amendments to IFRS 16 Leases

IFRS 16 Leases issued on May 22, 2017 is effective for annual periods beginning on or after January 1, 2019, with early adoption permitted. This standard will replace IAS 17 Leases. The Group will apply the standards for annual periods beginning on or after January 1, 2019.

Under the new standard, with implementation of a single lease model, lessee is required to recognize assets and liabilities for all lease which lease term is over 12 months and underlying assets are not low value assets. A lessee is required to recognize a right-of-use asset and a lease liability representing its obligation to make lease payments.

The Group performed an impact assessment to identify potential financial effects of applying IFRS 16. The Group is analyzing the effects on the financial statements based on available information as at December 31, 2018 to identify effects on 2019 financial statements.

The Group will adopt IFRS 16 Leases effective January 1, 2019 using a modified retrospective method and will not restate comparative periods. The Group will carry forward the assessment of whether our contracts contain or are leases, classification of our leases and remaining lease terms. Based on the Group’s portfolio of leases as at December 31, 2018, approximately KRW 616,759 million of lease assets and liabilities will be recognized on the consolidated statement of financial position upon adoption. In the statement of cash flows, the repayment portion of the lease payments from existing operating leases will reduce net cash from/used in financing activities and no longer affect net cash from operating activities. Only the interest payments will remain in net cash from operating activities, the total of which will rise.

- Amendments to IFRS 9 Financial Instruments

The narrow-scope amendments made to IFRS 9 Financial Instruments enable entities to measure certain prepayable financial assets with negative compensation at amortized cost. When a modification of a financial liability measured at amortized cost that does not result in the derecognition, a modification gain or loss shall be recognized in profit or loss. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted.

- Amendments to IAS 19 Employee Benefits

The amendments require that an entity shall calculate current service cost and net interest for the remainder of the reporting period after a plan amendment, curtailment or settlement based on updated actuarial assumptions from the date of the change. The amendments also require that a reduction in a surplus must be recognized in profit or loss even if that surplus was not previously recognized because of the impact of the asset ceiling. The amendments are effective for plan amendments, curtailments and settlements occurring in reporting periods that begin on or after January 1, 2019.

- Amendments to IAS 28 Investments in Associates and Joint Ventures

The amendments clarify that an entity shall apply IFRS 9 to financial instruments in an associate or joint venture to which the equity method is not applied. These include long-term interests that, in substance, form part of the entity’s net investment in an associate or joint venture. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted. In accordance with the transitional provisions in IFRS 9, the restatement of the comparative information is not required and the cumulative effects of initially applying the amendments retrospectively should be recognized in the beginning balance of retained earnings (or other components of equity, as appropriate) at the date of initial application.

- Enactment to IFRIC 23 Uncertainty over Income Tax Treatments

The Interpretation explains how to recognize and measure deferred and current income tax assets and liabilities where there is uncertainty over a tax treatment, and includes guidance on how to determine whether each uncertain tax treatment is considered separately or together. It also presents examples of circumstances where a judgement or estimate is required to be reassessed. This Interpretation will be applied for annual periods beginning on or after January 1, 2019, and an entity can either restate the comparative financial statements retrospectively or recognize the cumulative effect of initially applying the Interpretation as an adjustment in the beginning balance at the date of initial application.

- Annual Improvements to IFRS 2015 – 2017 Cycle:

• IFRS 3 Business Combination

The amendments clarify that when a party to a joint arrangement obtains control of a business that is a joint operation, and had rights to the assets and obligations for the liabilities relating to that joint operation immediately before the acquisition date, the transaction is a business combination achieved in stages. In such cases, the acquirer shall remeasure its entire previously held interest in the joint operation. These amendments will be applied to business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• IFRS 11 Joint Agreements

The amendments clarify that when a party that participates in, but does not have joint control of, a joint operation might obtain joint control of the joint operation in which the activity of the joint operation constitutes a business. In such cases, previously held interests in the joint operation are not remeasured. These amendments will be applied to transactions in which an entity obtains joint control on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• Paragraph 57A of IAS 12 Income Tax

The amendment is applied to all the income tax consequences of dividends and requires an entity to recognize the income tax consequences of dividends in profit or loss, other comprehensive income or equity according to where the entity originally recognized those past transactions or events. These amendments will be applied for annual reporting periods beginning on or after January 1, 2019, with early adoption permitted.

• IAS 23 Borrowing Costs

The amendments clarify that if a specific borrowing remains outstanding after the related qualifying asset is ready for its intended use (or sale), it becomes part of general borrowings. These amendments will be applied to borrowing costs incurred on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

2.3 Consolidation

The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements.

(1) Subsidiaries

Subsidiaries are all entities (including special purpose entities (“SPEs”)) over which the Group has control. The Group controls an entity when the Group is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power to direct the activities of the entity. Subsidiaries are fully consolidated from the date on which control is transferred to the Group. They are deconsolidated from the date that control ceases.

The acquisition method of accounting is used to account for business combinations by the Group. The consideration transferred is measured at the fair values of the assets transferred, and identifiable assets acquired and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. The Group recognizes any non-controlling interest in the acquired entity on an acquisition-by-acquisition basis either at fair value or at the non-controllinginterest’s proportionate share of the acquired entity’s net identifiable assets. All other non-controlling interests are measured at fair values, unless otherwise required by other standards. Acquisition-related costs are expensed as incurred.

The excess of consideration transferred, amount of any non-controlling interest in the acquired entity and acquisition-date fair value of any previous equity interest in the acquired entity over the fair value of the net identifiable assets acquired is recoded as goodwill. If those amounts are less than the fair value of the net identifiable assets of the business acquired, the difference is recognized directly in the profit or loss as a bargain purchase.

Intercompany transactions, balances and unrealized gains on transactions between group companies are eliminated. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the transferred asset. Accounting policies of subsidiaries have been changed where necessary to ensure consistency with the policies adopted by the Group.

(2) Changes in ownership interests in subsidiaries without change of control

Any difference between the amount of the adjustment to non-controlling interest that do not result in a loss of control and any consideration paid or received is recognized in a separate reserve within equity attributable to owners of the Controlling Group.

(3) Disposal of subsidiaries

When the Group ceases to consolidate for a subsidiary because of a loss of control, any retained interest in the subsidiary is remeasured to its fair value with the change in carrying amount recognized in profit or loss.

(4) Associates

Associates are all entities over which the Group has significant influence, and investments in associates are initially recognized at acquisition cost using the equity method. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If there is any objective evidence that the investment in the associate is impaired, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss.

(5) Joint arrangement

A joint arrangement, wherein two or more parties have joint control, is classified as either a joint operation or a joint venture. A joint operator recognizes its direct right to the assets, liabilities, revenues and expenses of joint operations and its share of any jointly held or incurred assets, liabilities, revenues and expenses. A joint venture has rights to the net assets relating to the joint venture and accounts for that investment using the equity method.

2.4 Segment Reporting

Information of each operating segment is reported in a manner consistent with the business segment reporting provided to the chief operating decision-maker (Note 34). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments.

2.5 Foreign Currency Translation

(1) Functional and presentation currency

Items included in the financial statements of each of the Group’s entities are measured using the currency of the primary economic environment in which each entity operates (the “functional currency”). The consolidated financial statements are presented in Korean won, which is the Parent Company’s functional and presentation currency.

(2) Transactions and balances

Foreign currency transactions are translated into the functional currency using the exchange rates at the dates of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation of monetary assets and liabilities denominated in foreign currencies at year end exchange rates are generally recognized in profit or loss. They are deferred in other comprehensive income if they relate to qualifying cash flow hedges and qualifying effective portion of net investment hedges, or are attributable to monetary part of the net investment in a foreign operation.

Foreign exchange gains and losses are presented in the statement of profit or loss, within finance costs.

Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. Translation differences on assets and liabilities carried at fair value are reported as part of the fair value gain or loss. For example, translation differences on non-monetary assets and liabilities such as equities held at fair value through profit or loss are recognized in profit or loss as part of the fair value gain or loss and translation differences on non-monetary assets such as equities classified as equity instruments at fair value through other comprehensive income are recognized in other comprehensive income.

(3) Translation to the presentation currency

The results and financial position of foreign operations that have a functional currency different from the presentation currency are translated into the presentation currency as follows:

• assets and liabilities for each statement of financial position presented are translated at the closing rate at the end of the reporting period,

• income and expenses for each statement of profit or loss are translated at average exchange rates for the period,

• equity is translated at the historical exchange rate, and

• all resulting exchange differences are recognized in other comprehensive income.

2.6 Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, deposits held at call with banks, and other short-term highly liquid investments with original maturities of less than three months.

2.7 Financial Assets

(1) Classification

From January 1, 2018, the Group classifies its financial assets in the following measurement categories:

• those to be measured at fair value through profit or loss

• those to be measured at fair value through other comprehensive income, and

• those to be measured at amortized cost.

The classification depends on the Group’s business model for managing the financial assets and the contractual terms of the cash flows.

For financial assets measured at fair value, gains and losses will either be recorded in profit or loss or other comprehensive income. For investments in debt instruments, this will depend on the business model in which the investment is held. The Group reclassifies debt investments when, and only when its business model for managing those assets changes.

For investments in equity instruments that are not held for trading, this will depend on whether the Group has made an irrevocable election at the time of initial recognition to account for the equity investment at fair value through other comprehensive income. Changes in fair value of the investments in equity instruments that are not accounted for as other comprehensive income are recognized in profit or loss.

(2) Measurement

At initial recognition, the Group measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition of the financial asset. Transaction costs of financial assets carried at fair value through profit or loss are expensed in profit or loss.

Hybrid (combined) contracts with embedded derivatives are considered in their entirety when determining whether their cash flows are solely payment of principal and interest.

A. Debt instruments

Subsequent measurement of debt instruments depends on the Group’s business model for managing the asset and the cash flow characteristics of the asset. The Group classifies its debt instruments into one of the following three measurement categories:

• Amortized cost: Assets that are held for collection of contractual cash flows where those cash flows represent solely payments of principal and interest are measured at amortized cost. A gain or loss on a debt investment that is subsequently measured at amortized cost and is not part of a hedging relationship is recognized in profit or loss when the asset is derecognized or impaired. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method.

• Fair value through other comprehensive income: Assets that are held for collection of contractual cash flows and for selling the financial assets, where the assets’ cash flows represent solely payments of principal and interest, are measured at fair value through other comprehensive income. Movements in the carrying amount are taken through other comprehensive income, except for the recognition of impairment loss (and reversal of impairment loss), interest income and foreign exchange gains and losses which are recognized in profit or loss. When the financial asset is derecognized, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. Foreign exchange gains and losses are presented in ‘finance income or finance costs’ and impairment loss in ‘finance costs or operating expenses’.

• Fair value through profit or loss: Assets that do not meet the criteria for amortized cost or fair value through other comprehensive income are measured at fair value through profit or loss. A gain or loss on a debt investment that is subsequently measured at fair value through profit or loss and is not part of a hedging relationship is recognized in profit or loss and presented net in the statement of profit or loss within ‘finance income or finance costs’ in the period in which it arises.

B. Equity instruments

The Group subsequently measures all equity investments at fair value. Where the Group’s management has elected to present fair value gains and losses on equity investments in other comprehensive income, there is no subsequent reclassification of fair value gains and losses to profit or loss following the derecognition of the investment. Dividends from such investments continue to be recognized in profit or loss as ‘finance income’ when the Group’s right to receive payments is established.

Changes in the fair value of financial assets at fair value through profit or loss are recognized in ‘finance income or finance costs’ in the statement of profit or loss as applicable. Impairment loss (and reversal of impairment loss) on equity investments measured at fair value through other comprehensive income are not reported separately from other changes in fair value.

(3) Impairment

The Group assesses on a forward looking basis the expected credit losses associated with its debt instruments carried at amortized cost and fair value through other comprehensive income. The impairment methodology applied depends on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, the Group applies the simplified approach, which requires expected lifetime credit losses to be recognized from initial recognition of the receivables.

(4) Recognition and Derecognition

Regular way purchases and sales of financial assets are recognized or derecognized on trade-date, the date on which the Group commits to purchase or sell the asset. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and the Group has transferred substantially all the risks and rewards of ownership.

If a transfer does not result in derecognition because the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continues to recognize the transferred asset in its entirety and recognizes a financial liability for the consideration received.

(5) Offsetting of financial instruments

Financial assets and liabilities are offset and the net amount reported in the statements of financial position where there is a legally enforceable right to offset the recognized amounts and there is an intention to settle on a net basis or realize the assets and settle the liability simultaneously. The legally enforceable right must not be contingent on future events and must be enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group or the counterparty.

2.8 Derivative Instruments

Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured to their fair value at the end of each reporting period. The accounting for subsequent changes in fair value depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The Group has hedge relationships and designates certain derivatives as:

• hedges of a particular risk associated with the cash flows of recognized assets and liabilities and highly probable forecast transactions (cash flow hedges)

At inception of the hedge relationship, the Group documents the economic relationship between hedging instruments and hedged items including whether changes in the cash flows of the hedging instruments are expected to offset changes in the cash flows of hedged items.

The fair values of derivative financial instruments designated in hedge relationships are disclosed in Note 37.

The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedged item is more than 12 months; it is classified as a current asset or liability when the remaining maturity of the hedged item is less than 12 months. A non-derivative financial asset and a non-derivative financial liability is classified as a current or non-current based on its expected maturity and its settlement, respectively.

The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in the cash flow hedge reserve within equity, and the ineffective portion is recognized in ‘finance income (costs)’.

Amounts of changes in fair value of effective hedging instruments accumulated in equity are recognized as ‘finance income (costs)’ for the periods when the corresponding transactions affect profit or loss.

When a hedging instrument expires, or is sold, terminated, exercised, or when a hedge no longer meets the criteria for hedge accounting, any accumulated cash flow hedge reserve at that time remains in equity until the forecast transaction occurs, resulting in the recognition of a non-financial asset such as inventory. When the forecast transaction is no longer expected to occur, the cash flow hedge reserve and deferred costs of hedging that were reported in equity are immediately reclassified to profit or loss.

2.9 Trade Receivables

Trade receivables are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less loss allowance. See Note 6 for further information about the Group’s accounting for trade receivables and Note 2.7 (3) for a description of the Group’s impairment policies.

2.10 Inventories

Inventories are stated at the lower of cost and net realizable value. Cost is determined using the moving average method, except for inventories in-transit which is determined using the specific identification method.

2.11 Non-current Assets (or Disposal Group) Held-for-sale

Non-current assets (or disposal group) are classified as held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continuing use and a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less costs to sell.

2.12 Property and Equipment

Property and equipment are stated at historical cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items.

Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:

	Estimated Useful Life
Buildings	5 – 40 years
Structures	5 – 40 years
Machinery and equipment (Telecommunications equipment and others)	2 – 40 years
Others
Vehicles	4 – 6 years
Tools	4 – 6 years
Office equipment	2 – 6 years

The depreciation method, residual values and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates.

2.13 Investment Property

Investment property is a property held to earn rentals or for capital appreciation. An investment property is measured initially at its cost. After recognition as an asset, investment property is carried at cost less accumulated depreciation and impairment losses. Investment property, except for land, is depreciated using the straight-line method over their useful lives from 10 to 40 years.

2.14 Intangible Assets

(1) Goodwill

Goodwill is measured as explained in Note 2.3 (a) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Gains and losses on the disposal of subsidiaries and business include the carrying amount of goodwill relating to the subsidiaries and business sold.

For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the CGUs, or group of CGUs, that is expected to benefit from the synergies of the combination. Goodwill is monitored at the operating segment level.

Goodwill impairment reviews are undertaken annually or more frequently if events or changes in circumstances indicate a potential impairment. The carrying amount of goodwill is compared to the recoverable amount, which is the higher of value in use and the fair value less costs to sell. Any impairment is recognized immediately as an expense and is not subsequently reversed.

(2) Intangible assets except goodwill

Intangible assets, except for goodwill, are initially recognized at its historical cost, and carried at cost less accumulated amortization and accumulated impairment losses. Membership rights (condominium membership and golf membership) that have an indefinite useful life are not subject to amortization because there is no foreseeable limit to the period over which the assets are expected to be utilized. The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:

	Estimated Useful Life
Development costs	5 – 6 years
Software	6 years
Industrial property rights	5 – 50 years
Frequency usage rights	5 – 10 years
Others1	2 – 50 years

¹  Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.

2.15 Borrowing Costs

General and specific borrowing costs that are directly attributable to the acquisition, construction or production of a qualifying asset are capitalized during the period of time that is required to complete and prepare the asset for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Other borrowing costs are expensed in the period in which they are incurred.

2.16 Government Grants

Grants from the government are recognized at their fair value where there is a reasonable assurance that the grant will be received and the Group will comply with all attached conditions. Government grants related to assets are presented in the statement of financial position by setting up the grant as deferred income that is recognized in profit or loss on a systematic basis over the useful life of the asset. Grants related to income are presented as a credit in the statement of profit or loss within ‘other income’.

2.17 Impairment of Non-Financial Assets

Goodwill and intangible assets that have an indefinite useful life are not subject to amortization and are tested annually for impairment, or more frequently if events or changes in circumstances indicate that they might be impaired. Other assets are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of an asset’s fair value less costs of disposal and value in use. Non-financial assets other than goodwill that suffered an impairment are reviewed for possible reversal of the impairment at the end of each reporting period.

2.18 Trade and other payables

These amounts represent liabilities for goods and services provided to the Group prior to the end of reporting period which are unpaid. Trade and other payables are presented as current liabilities, unless payment is not due within 12 months after the reporting period. They are recognized initially at their fair value and subsequently measured at amortized cost using the effective interest method.

2.19 Financial Liabilities

(1) Classification and measurement

The Group’s financial liabilities at fair value through profit or loss are financial instruments held for trading. A financial liability is held for trading if it is incurred principally for the purpose of repurchasing in the near term. Derivatives that are not designated as hedging instruments or derivatives separated from financial instruments containing embedded derivatives are also categorized as held for trading.

The Group classifies non-derivative financial liabilities, except for financial liabilities at fair value through profit or loss, financial guarantee contracts and financial liabilities that arise when a transfer of financial assets does not qualify for derecognition, as financial liabilities carried at amortized cost and present as ‘trade payables’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position.

Preferred shares that require mandatory redemption at a particular date are classified as liabilities. Interest expenses on these preferred shares using the effective interest method are recognized in the statement of profit or loss as ‘finance costs’, together with interest expenses recognized from other financial liabilities.

(2) Derecognition

Financial liabilities are removed from the statement of financial position when it is extinguished; for example, when the obligation specified in the contract is discharged or cancelled or expired or when the terms of an existing financial liability are substantially modified. The difference between the carrying amount of a financial liability extinguished or transferred to another party and the consideration paid (including any non-cash assets transferred or liabilities assumed) is recognized in profit or loss.

2.20 Financial Guarantee Contracts

Financial guarantee contracts are recognized as a financial liability at the time the guarantee is issued. The liability is initially measured at fair value, subsequently at the higher of following and recognized in the statement of financial position within ‘other financial liabilities’.

• the amount determined in accordance with the expected credit loss model under IFRS 9 Financial Instruments and

• the amount initially recognized less, where appropriate, the cumulative amount of income recognized in accordance with IFRS 15 Revenue from Contracts with Customers

2.21 Employee Benefits

(1) Post-employment benefits

The Group operates both defined contribution and defined benefit pension plans.

A defined contribution plan is a pension plan under which the Group pays fixed contributions into a separate entity. The contributions are recognized as employee benefit expenses when an employee has rendered service.

A defined benefit plan is a pension plan that is not a defined contribution plan. Generally, post-employment benefits are payable after the completion of employment, and the benefit amount depended on the employee’s age, periods of service or salary levels. The liability recognized in the statement of financial position in respect of defined benefit pension plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of plan assets. The defined benefit obligation is calculated annually by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid, and that have terms approximating to the terms of the related obligation. Remeasurement gains and losses arising from experience adjustments and changes in actuarial assumptions are recognized in the period in which they occur, directly in other comprehensive income.

Changes in the present value of the defined benefit obligation resulting from plan amendments or curtailments are recognized immediately in profit or loss as past service costs.

(2) Termination benefits

Termination benefits are payable when employment is terminated by the Group before the normal retirement date, or whenever an employee accepts voluntary redundancy in exchange for these benefits. The Group recognizes termination benefits at the earlier of the following dates: when the entity can no longer withdraw the offer of those benefits or when the entity recognizes costs for a restructuring.

(3) Long-term employee benefits

Certain entities within the Group provide long-term employee benefits that are entitled to employees with service period for ten years and above. The expected costs of these benefits are accrued over the period of employment using the same accounting methodology as used for defined benefit pension plans. The Group recognizes service cost, net interest on other long-term employee benefits and remeasurements as profit or loss for the year. These liabilities are valued annually by an independent qualified actuary.

2.22 Share-based payments

Equity-settled share-based payment is recognized at fair value of equity instruments granted, and employee benefit expense is recognized over the vesting period. At the end of each period, the Group revises its estimates of the number of options that are expected to vest based on the non-market vesting and service conditions. It recognizes the impact of the revision to original estimates, if any, in profit or loss, with a corresponding adjustment to equity.

2.23 Provisions

Provisions for service warranties, make good obligation, and legal claims are recognized when the Group has a present legal or constructive obligation as a result of past events, it is probable that an outflow of resources will be required to settle the obligation and the amount can be reliably estimated. Provisions are measured at the present value of management’s best estimate of the expenditure required to settle the present obligation at the end of the reporting period, and the increase in the provision due to the passage of time is recognized as interest expense.

2.24 Leases

(1) Lessee

A lease is an agreement, whereby the lessor conveys to the lessee, in return for a payment or series of payments, the right to use an asset for an agreed period of time. Leases where all the risks and rewards of ownership are not transferred to the Group are classified as operating leases. Lease payments under operating leases are recognized as expenses on a straight-line basis over the lease term.

Leases where the Group has substantially all the risks and rewards of ownership are classified as finance leases. Finance leases are capitalized as lease assets and liabilities at the lease’s inception at the fair value of the leased property or, if lower, the present value of the minimum lease payments.

(2) Lessor

A lease is classified as a finance lease if it transfers substantially all the risks and rewards incidental to ownership at the inception of the lease. A lease other than a finance lease is classified as an operating lease. Lease income from operating leases is recognized in income on a straight-line basis over the lease term. Initial direct costs incurred by the lessor in negotiating and arranging an operating lease is added to the carrying amount of the leased asset and recognized as an expense over the lease term on the same basis as the lease income.

2.25 Share Capital

The Group classifies ordinary shares as equity.

Where the Controlling Company purchases its own shares, the consideration paid, including any directly attributable incremental costs, is deducted from equity until the share are cancelled or reissued. When these treasury shares are reissued, any consideration received is including in equity attributable to the equity holders of the Controlling Company.

2.26 Revenue Recognition

In May 2014, the IASB issued IFRS 15, which replaced IAS 18. This standard is applicable to years beginning on or after January 1, 2018. The Group adopted IFRS 15 retrospectively, with the cumulative effects of the initial application being recognized on the date of the initial application, on January 1, 2018. Accordingly, as provided for in this standard, the Group recorded the cumulative effect as at the date of the initial application of the standard as an adjustment to the initial balance in the retained earnings. In accordance with this transition method, the entity applied this pronouncement retrospectively only for contracts that are still in force as at the date of the initial application.

(1) Identification of contracts

The Group performed a comprehensive review of the commercial offers in force, in order to identify the principal contractual clauses and other contractual elements that may be significant regarding the adoption of the new accounting standard.

(2) Identifying performance obligations

With the application of IFRS 15, the Group identifies performance obligations with a customer such as mobile and fixed-line service, Media and content services, financial services and sale of goods. Accordingly, the Group will recognize revenue when, or to the extent that, it satisfies the performance obligations by transferring the goods or services that were promised to the customer.

Mobile and fixed-line service

Telecommunication service revenues include mobile and fixed-line(e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that is considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees).

Media and content services

Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading.

Media and contents services revenue are recognized when services are provided, based upon either usage or period of time.

Financial services

Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed.

Sale of goods

Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers.

(3) Allocation the transaction price and Revenue recognition

With the application of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer.

The Group verified the existence of two main performance obligations: (i) telecommunication services; and (ii) selling handsets.

To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct good or service underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The standalone selling price is the price at which the Group would sell a promised good or service separately to the customer. The best evidence of a stand-alone selling price is the observable price of a good or service when the Group sells that good or service separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

The adoption of the new revenue standard in some cases resulted in the early recognition of revenue from the sale of handsets, which are usually recognized upon the transfer of control to the customer, basically due to the allocation of discounts between the performance obligations arising from the sale of plans that include mobile services as well as handsets. The difference between the carrying value of sales of handsets, and the amount received from the customer is recorded as a contractual asset and/or liability at the beginning of the contract. Revenue from telecommunication services, in turn, will be recognized in the statement of income based on the allocation of the transaction price, and to the extent that services are being provided to customers in monthly basis.

(4) Incremental contract acquisition costs

The Group pays the commission fees to authorized dealers when new customer subscribe for telecommunication services. The incremental contract acquisition costs are those commission fess that the Group incurs to acquire a contract with a customer that it would not have incurred if the contract had not been acquired. According to IFRS 15, the Group recognizes as an asset the incremental contract acquisition costs and amortize it over the expected period of benefit. However, as a practical expedient, the Group may recognize the incremental contract acquisition costs as an expense when incurred if the amortization period of the asset is one year or less.

2.27 Current and Deferred Income Tax

The tax expense for the period consists of current and deferred tax. Current and deferred tax is recognized in profit or loss, except to the extent that it relates to items recognized in other comprehensive income or directly in equity. In this case, the tax is also recognized in other comprehensive income or directly in equity, respectively.

The tax expense is measured at the amount expected to be paid to the taxation authorities, using the tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period.

Management periodically evaluates tax policies that are applied in tax returns in which applicable tax regulation is subject to interpretation. The Group recognizes current income tax on the basis of the amount expected to be paid to the tax authorities.

Deferred income tax is provided in full, using the liability method, on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. However, deferred income tax is not accounted for if it arises from initial recognition of an asset or liability in a transaction other than a business combination that at the time of the transaction affects neither accounting nor taxable profit or loss.

Deferred tax assets are recognized only if it is probable that future taxable amount will be available to utilize those temporary differences and losses.

The Group recognizes a deferred tax liability all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint arrangements, except to the extent that the Group is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. In addition, The Group recognizes a deferred tax asset for all deductible temporary differences arising from such investments to the extent that it is probable the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized.

Deferred tax assets and liabilities are offset when there is a legally enforceable right to offset current tax assets and liabilities and when the deferred tax balances relate to the same taxation authority. Current tax assets and tax liabilities are offset where the entity has a legally enforceable right to offset and intends either to settle on a net basis.

The Group adopts the consolidated corporate tax return and calculates income tax expenses and income tax liabilities of the Group based on systematic and reasonable methods.

2.28 Dividend

Dividend distribution to the Group’s shareholders is recognized as a liability in the financial statements in the period in which the dividends are approved by the Group’s shareholders.

2.29 Approval of the Financial Statements

The consolidated financial statements 2018 were approved for issue by the Board of Directors on March 29, 2019.

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Critical Accounting Estimates and Assumptions

12 Months Ended

Dec. 31, 2018

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Critical Accounting Estimates and Assumptions

3. Critical Accounting Estimates and Assumptions

The preparation of financial statements requires the Group to make estimates and assumptions concerning the future. Management also needs to exercise judgement in applying the Group’s accounting policies. Estimates and assumptions are continually evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the circumstances. As the resulting accounting estimates will, by definition, seldom equal the related actual results, it can contain a significant risk of causing a material adjustment.

The estimates and assumptions that have a significant risk of causing a material adjustment to the carrying amounts of assets and liabilities within the next financial year are discussed below. Additional information of significant judgement and assumptions of certain items are included in relevant notes.

3.1 Estimated Goodwill Impairment

The Group tests whether goodwill has suffered any impairment on an annual basis. The recoverable amount of cash-generating units (CGUs) is determined based on value-in-use calculations (Note 13).

3.2 Income Taxes

If certain portion of the taxable income is not used for investments or increase in wages or dividends in accordance with the Tax System For Recirculation of Corporate Income, the Group is liable to pay additional income tax calculated based on the tax laws. Accordingly, the measurement of current and deferred income tax is affected by the tax effects from the new tax system. As the Group’s income tax is dependent on the investments, increase in wages and dividends, there is an uncertainty measuring the final tax effects.

3.3 Fair Value of Derivatives and Financial Instruments

The fair value of financial instruments that are not traded in an active market is determined by using valuation techniques. The Group uses its judgment to select a variety of methods and make assumptions that are mainly based on market conditions existing at the end of each reporting period (Note 37).

3.4 Impairment of Financial Assets

The provision for impairment for financial assets are based on assumptions about risk of default and expected loss rates. The Group uses judgement in making these assumptions and selecting the inputs to the impairment calculation based on the Group’s past history, existing market conditions as well as forward looking estimates at the end of each reporting period.

3.5 Net Defined Benefit Liability

The present value of net defined benefit liability depends on a number of factors that are determined on an actuarial basis using a number of assumptions including the discount rate (Note 18).

3.6 Amortization of Contract Assets, Contract Liabilities and Contract Cost Assets

Contract assets, contract liabilities and contract cost assets recognized under the application of IFRS 15 are amortized over the expected periods of customer relationships which are from 20 months to 34 months. The estimate of the expected terms of customer relationship is based on the historical data. If management’s estimate changes, it may cause significant differences in the timing of revenue recognition and amounts recognized.

3.7 Provisions

As described in Note 17, the Group records provisions for litigation and assets retirement obligations at the end of the reporting period. The provisions are estimated based on the factors such as the historical experiences.

3.8 Useful Lives of Property and Equipment and Investment Property

The property and equipment, intangible assets, and investment properties, excluding land, goodwill, condominium memberships, golf club memberships and broadcast license, are depreciated using the straight-line method over their useful lives. The estimated useful lives are determined based on expected usage of the assets and the estimates can be materially affected by technical changes and other factors. The Group will increase depreciation expenses if the useful lives are considered shorter than the previously estimated useful lives.

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Financial Instruments by Category

12 Months Ended

Dec. 31, 2018

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Financial Instruments by Category

4. Financial Instruments by Category

Financial instruments by category as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
Financial assets	Loans and receivables		Assets at fair value through profit and loss		Derivatives used for hedge		Available- for-sale		Held-to- Maturity		Total
Cash and cash equivalents	￦	1,928,182	￦	—	￦	—	￦	—	￦	—	￦	1,928,182
Trade and other receivables		6,793,397		—		—		—		—		6,793,397
Other financial assets		1,333,317		5,813		7,389		380,953		151		1,727,623

(In millions of Korean won)	December 31, 2017
Financial liabilities	Liabilities at fair value through profit and loss		Derivatives used for hedge		Financial liabilities at amortized cost		Total
Trade and other payables	￦	—	￦	—	￦	8,427,457	￦	8,427,457
Borrowings		—		—		6,683,662		6,683,662
Other financial liabilities		5,051		93,770		87,670		186,491

(In millions of Korean won)	December 31, 2018
Financial assets	Financial assets at amortized cost		Financial assets at fair value through profit or loss		Financial assets at fair value through other comprehensive income		Derivatives used for hedging		Total
Cash and cash equivalents	￦	2,703,422	￦	—	￦	—	￦	—	￦	2,703,422
Trade and other receivables		5,425,996		—		1,097,348		—		6,523,344
Other financial assets		484,271		777,685		326,157		29,843		1,617,956

(In millions of Korean won)	December 31, 2018
Financial liabilities	Financial liabilities at amortized cost		Financial liabilities at fair values through profit and loss		Derivatives used for hedging		Total
Trade and other payables	￦	8,521,379	￦	—	￦	—	￦	8,521,379
Borrowings		6,648,293		—		—		6,648,293
Other financial liabilities		99,330		7,758		57,308		164,396

Gains or losses arising from financial instruments by category for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Financial assets at amortized cost
Interest income1	￦	129,813		￦	108,608		￦	93,233
Gain(loss) on foreign currency transaction4		(7,493	)		(11,949	)		19,396
Gain(loss) on foreign currency translation		3,083			(12,354	)		(2,901	)
Gain(loss) on disposal		(15,838	)		(20,351	)		44
Loss on valuation		(92,589	)		(44,219	)		(110,544	)
Financial assets at fair value through profit or loss
Interest income1		—			—			9,194
Dividend income		—			—			1,207
Gain on valuation		—			—			10,768
Gain on disposal		—			—			1,713
Financial assets at fair value through other comprehensive income
Interest income1		—			—			163,390
Dividend income		—			—			1,704
Impairment loss		—			—			(2,416	)
Loss on disposal		—			—			(13,818	)
Other comprehensive income for the year2		—			—			43,811
Assets at fair value through profit or loss
Dividend income		—			1			—
Gain on disposal		186			153			—
Loss on valuation		(7,184	)		(464	)		—
Derivatives used for hedging
Gain(loss) on transaction		—			(58,569	)		7,272
Gain(loss) on valuation		109,436			(63,640	)		22,065
Other comprehensive income for the year2		60,501			(44,429	)		20,078
Reclassified to profit or loss from other comprehensive income for the year2,3		(71,915	)		50,231			(15,891	)
Available-for-sale
Interest income1		40			453			—
Dividend income		3,926			5,174			—
Gain on disposal		22,695			89,598			—
Impairment loss		(966	)		(6,137	)		—
Other comprehensive income for the year2		10,925			51,235			—
Reclassified to profit or loss from other comprehensive income for the year2		(3,840	)		(55,450	)		—
Held-to-Maturity
Interest income1,4		213			—			—
Financial liabilities at fair value through profit or loss
Loss on disposal		(632	)		—			—
Gain(loss) on valuation		33			(3,078	)		(2,708	)
Derivatives used for hedging
Gain on transactions		8,329			—			20,678
Loss on valuation		(138	)		(145,885	)		42,195
Other comprehensive income for the year2		4,295			(66,624	)		(2,810	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(3,956	)		91,698			(28,388	)
Financial liabilities at amortized cost
Interest expense1		(337,219	)		(302,464	)		(296,894	)
Gain(loss) on repayment		—			—			(15	)
Gain(loss) foreign currency transaction4		(7,518	)		62,347			(30,956	)
Gain(loss) foreign currency translation		(112,864	)		225,695			(66,050	)
Total	￦	(308,677	)	￦	(150,420	)	￦	(116,643	)

1 BC Card, a subsidiary of the Group, recognized interest income as operating revenue. Interest income recognized as operating revenue is ￦21,021 million (2016: ￦14,380 million, 2017: ￦15,561 million) for the year ended December 31, 2018.

2 The amounts directly reflected in equity after adjustments of deferred income tax.

3 During the year, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year.

4 BC Card recognized gain/loss on foreign currency transaction as operating income and expenses. During the year, related gain/loss on foreign currency transaction recognized as operating income and expense is ￦20,422 million (2016: (-) ￦1,987 million, 2017: ￦11,049 million).

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Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Cash and Cash Equivalents

5. Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	Type	December 31, 2017	December 31, 2018	Description
Restricted cash and cash equivalents	Restricted deposit	￦16,837	￦23,970	Deposit restricted for governmental project and others

Cash and cash equivalents in the statement of financial position equal to cash and cash equivalents in the statement of cash flows.

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Trade and Other Receivables

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Trade and Other Receivables

6. Trade and Other Receivables

Trade and other receivables as at December 31, 2017 and 2018 are as follows:

	December 31, 2017
(In millions of Korean won)	Total amounts		Allowance for doubtful accounts			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,405,947	￦	(438,817	)	￦	(7,508	)	￦	2,959,622
Other receivables		3,071,532		(66,402	)		(187	)		3,004,943
	￦	6,477,479	￦	(505,219	)	￦	(7,695	)	￦	5,964,565
Non-current assets
Trade receivables	￦	366,108	￦	(610	)	￦	(12,803	)	￦	352,695
Other receivables		522,458		(17,970	)		(28,351	)		476,137
	￦	888,566	￦	(18,580	)	￦	(41,154	)	￦	828,832

	December 31, 2018
(In millions of Korean won)	Total amounts		Expected credit losses			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,422,086	￦	(357,548	)	￦	(9,873	)	￦	3,054,665
Other receivables		2,700,792		(74,948	)		(160	)		2,625,684
	￦	6,122,878	￦	(432,496	)	￦	(10,033	)	￦	5,680,349
Non-current assets
Trade receivables	￦	402,027	￦	(2,376	)	￦	(17,970	)	￦	381,681
Other receivables		506,061		(18,874	)		(25,873	)		461,314
	￦	908,088	￦	(21,250	)	￦	(43,843	)	￦	842,995

The fair values of trade and other receivables with original maturities less than one year equal to their carrying amounts because the discounting effect is immaterial. The fair value of trade and other receivables with original maturities longer than one year, which are mainly from sales of goods, is determined discounting the expected future cash flow at the weighted average interest rate.

Details of changes in allowance for doubtful accounts the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016						2017						2018
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	468,741		￦	250,842		￦	470,871		￦	141,616		￦	439,427		￦	84,372
Provision		84,975			7,736			38,888			5,809			91,282			21,783
Reversal or written-off		(80,518	)		(108,638	)		(70,121	)		(61,220	)		(170,597	)		(14,520	)
Changes in the scope of consolidation		215			56			(107	)		(35	)		—			—
Others		(2,542	)		(8,380	)		(104	)		(1,798	)		(188	)		2,187
Ending balance	￦	470,871		￦	141,616		￦	439,427		￦	84,372		￦	359,924		￦	93,822

Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs.

Details of other receivables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Loans	￦	84,682		￦	88,476
Receivables1		3,000,849			2,612,753
Accrued income		12,186			10,171
Refundable deposits		391,458			370,481
Loans receivable		34,273			54,952
Finance lease receivables		20,526			22,230
Others		21,478			21,757
Less: Allowance for doubtful accounts		(84,372	)		(93,822	)
	￦	3,481,080		￦	3,086,998

1 The settlement receivables of BC Card Co., Ltd. of ￦1,895,575 million (2017: ￦2,262,829 million) are included.

The maximum exposure of trade and other receivables to credit risk is the carrying amount of each class of receivables mentioned above as at December 31, 2018.

A portion of the trade receivables is classified as financial assets at fair value through other comprehensive income considering the trade receivables business model for managing the asset and the cash flow characteristics of the contract.

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Other Financial Assets and Liabilities

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Other Financial Assets and Liabilities

7. Other Financial Assets and Liabilities

Details of other financial assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other financial assets
Financial assets at amortized cost1,2	￦	1,333,368		￦	484,271
Financial assets at fair value through profit or loss1,2,3		5,913			777,685
Financial assets at fair value through other comprehensive income2		—			326,157
Available-for-sale financial assets		380,953			—
Derivative used for hedging		7,389			29,843
Less: Non-current		(754,992	)		(623,176	)
Current	￦	972,631		￦	994,780
Other financial liabilities
Financial liabilities at amortized cost	￦	87,669		￦	99,330
Financial liabilities at fair value through profit or loss		5,051			7,758
Derivatives used for hedging		93,771			57,308
Less: Non-current		(149,267	)		(163,454	)
Current	￦	37,224		￦	942

1 As at December 31, 2018, the Group’s financial assets amounting to ￦60,978 million (2017: ￦59,660 million), which consist of checking account deposits, deposits for Win-win Growth Cooperative loans and payment guarantee, are subject to withdrawal restrictions.

2 In the prior year, a portion of the equity instruments was classified as available-for-sale financial assets and held-to-maturity financial assets

3 As at December 31, 2018, MMW(Money Market Wrap) and MMT(Money Market Trust) amounting to ￦610,862 million is included in other financial assets.

Details of financial assets at fair value through profit or loss as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)		121
Equity Instruments (Unlisted)		62,911
Debt securities		714,653
Total		777,685
Less: non-current		(269,148	)
Current	￦	508,537

The maximum exposure of debt instruments of financial assets recognized at fair value through profit or loss to credit risk is carrying amount as at December 31, 2018.

Investment in Korea Software Financial Cooperative amounting to ￦1,136 million is provided as collateral.

￦94,531 million of available-for-sales was classified as financial assets at fair value through profit or loss in the prior year.

Details of financial asset at fair value through other comprehensive income as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)	￦	8,861
Equity Instruments (Unlisted)		310,387
Debt securities		6,909
Total		326,157
Less: non-current		(326,157	)
Current	￦	—

￦257,819 million of available-for-sales was classified as financial assets at fair value through other comprehensive income in the prior year.

Upon disposal of these equity investments, any balance within the accumulated other comprehensive income for these equity investments is not classified to profit or loss, but to retained earnings. Upon disposal of debt investments, remaining balance of the accumulated other comprehensive income of debt instruments is reclassified to profit or loss

Derivatives used for hedge as at December 31, 2017 and 2018, are as follows:

	December 31, 2017						December 31, 2018
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	2,633		￦	—		￦	599
Currency swap2		7,389			81,300			29,843			54,074
Currency forwards3		—			9,838			—			2,635
Total		7,389			93,771			29,843			57,308
Less: non-current		(4,675	)		(56,547	)		(4,732	)		(56,366	)
Current	￦	2,714		￦	37,224		￦	25,111		￦	942

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the bond.

2 The currency swap contract is to hedge the risk of variability in cash flow from the bond. In applying the cash flow hedge accounting, the Group hedges its exposures to cash flow fluctuation until September 7, 2034.

3 The currency forward contract is to hedge the risk of variability in cash flow from transactions in foreign currencies due to changes in foreign exchange rate.

The full value of a hedging derivative is classified as a non-current asset or liability if the remaining maturity of the hedged item is more than 12 months and, as a current asset or liability, if the maturity of the hedged item is less than 12 months.

The valuation gains and losses on the derivatives contracts for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016							2017							2018
Type of Transaction	Valuation gain		Valuation loss			Other comprehensive income1		Valuation gain		Valuation loss		Other comprehensive income1			Valuation gain		Valuation loss		Other comprehensive income1
Interest rate swap	￦	—	￦	148		￦	(142)	￦	38	￦	—	￦	637		￦	192	￦	—	￦	(488)
Currency swap		97,158		(10	)		85,479		19		187,468		(146,752	)		58,912		2,045		22,139
Currency forwards		12,278		—			146		—		22,114		(393	)		7,201		—		—
Total	￦	109,436	￦	138		￦	85,483	￦	57	￦	209,582	￦	(146,508)		￦	66,305	￦	2,045	￦	21,651

1 The amounts before adjustments of deferred income tax directly reflected in equity and allocation to the non-controlling interest.

The ineffective portion recognized in profit or loss on the cash flow hedge is valuation gain of ￦263 million for the current period (2016: valuation gain of ￦1,637 million, 2017: valuation loss of ￦1,961 million).

Details of financial liabilities at fair value through profit or loss as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	5,051	￦	7,758

The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017				2018
	Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	3,078	￦	—	￦	2,707

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Inventories

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Inventories

8. Inventories

Inventories as at December 31, 2017 and 2018, are as follows:

	December 31, 2017							December 31, 2018
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	504,321	￦	(58,293	)	￦	446,028	￦	794,020	￦	(113,581	)	￦	680,439
Others		195,999		—			195,999		394,195		—			394,195
Total	￦	700,320	￦	(58,293	)	￦	642,027	￦	1,188,215	￦	(113,581	)	￦	1,074,634

Cost of inventories recognized as expenses for year ended December 31, 2018, amounts to ￦3,926,199 million (2016: ￦3,589,809 million, 2017: ￦3,855,089 million) and valuation loss on inventory recognized amounts to ￦55,288 million for year ended December 31, 2018 (2016: reversal of valuation allowance of ￦20,223 million, 2017: valuation loss on inventory amounts to ￦11,165 million,).

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Other Assets and Liabilities

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Other Assets and Liabilities

9. Other Assets and Liabilities

Other assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other assets
Advance payments	￦	164,950		￦	162,784
Prepaid expenses1		241,078			1,667,372
Contract assets1		—			398,797
Others		5,997			4,490
Less: Non-current		(107,165	)		(545,895	)
Current	￦	304,860		￦	1,687,548
Other liabilities
Advances received	￦	375,792		￦	518,914
Withholdings		85,142			89,403
Unearned revenue		23,036			39,528
Contract liabilities1		—			347,462
Others		11,628			24,908
Less: Non-current		(237,284	)		(423,626	)
Current	￦	258,314		￦	596,589

1 As explained in Note 2, amounts include adjustments arising from adoption of IFRS 15(notes 26 and 41)

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Assets Held for Sale

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Assets Held for Sale

10. Assets Held for Sale

The Group decided to sell total shares of PT Mitra Transksi Indonesia, investments in associates, with the approval of the Board of Directors and shareholders. At the end of the reporting period, the associated asset amounting to ￦13,035 million is presented as held for sale. After classifying the asset as held for sale, share of net profit or loss from the associate is not recognized.

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Property and Equipment

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Property and Equipment

11. Property and Equipment

Changes in property and equipment for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,309,084		￦	3,729,228		￦	35,106,184		￦	1,895,332		￦	1,093,941		￦	43,133,769
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,604,496	)		(25,845,999	)		(1,370,409	)		(622	)		(28,821,658	)
Beginning, net		1,308,952			2,124,732			9,260,185			524,923			1,093,319			14,312,111
Acquisition and capital expenditure		1,948			120			237,218			129,464			2,262,681			2,631,431
Disposal and termination		(4,656	)		(4,022	)		(176,085	)		(8,242	)		(3,133	)		(196,138	)
Depreciation		—			(135,242	)		(2,469,459	)		(150,535	)		—			(2,755,236	)
Impairment		—			—			(9,256	)		(1	)		(28	)		(9,285	)
Transfer in (out)		26,764			25,305			2,227,808			10,344			(2,600,908	)		(310,687	)
Exclusion from scope of consolidation		—			(19	)		(772	)		(120	)		(34	)		(945	)
Transfer from(to) investment properties		(64,449	)		1,793			—			1,184			—			(61,472	)
Others		98			(245	)		(8,830	)		(179	)		(38,304	)		(47,460	)
Ending, net	￦	1,268,657		￦	2,012,422		￦	9,060,809		￦	506,838		￦	713,593		￦	13,562,319
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)

	2018
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)
Beginning, net		1,268,657			2,012,422			9,060,809			506,838			713,593			13,562,319
Acquisition and capital expenditure		9,897			1,728			137,088			101,832			2,037,085			2,287,630
Disposal and termination		(3,718	)		(2,640	)		(113,266	)		(4,336	)		(582	)		(124,542	)
Depreciation		—			(132,353	)		(2,398,782	)		(159,625	)		—			(2,690,760	)
Impairment		—			(5,551	)		(1,237	)		(8,935	)		(170	)		(15,893	)
Transfer in (out)		7,663			127,052			1,767,878			9,525			(1,911,094	)		1,024
Inclusion in scope of consolidation		—			44			4,228			2,526			—			6,798
Transfer from(to) investment properties		(3,080	)		5,366			—			37,077			—			39,363
Others		1,768			1,617			18,298			(6,521	)		(12,844	)		2,318
Ending, net	￦	1,281,187		￦	2,007,685		￦	8,475,016		￦	478,381		￦	825,988		￦	13,068,257
Acquisition cost	￦	1,281,319		￦	3,873,074		￦	36,327,007		￦	1,981,646		￦	826,583		￦	44,289,629
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,865,389	)		(27,851,991	)		(1,503,265	)		(595	)		(31,221,372	)

Details of property and equipment provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,115	￦	15,995		Borrowings	￦	2,730	Standard Chartered Bank, Korea Development Bank
Others		53,757		38,570				16,071	Shinhan Bank

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,163	￦	15,113		Borrowings	￦	7,878	Standard Chartered Bank, Korea Development Bank
Others		50,278		40,252				10,063	Shinhan Bank

The borrowing costs capitalized for qualifying assets amount to ￦7,329 million (2017: ￦8,473) in 2018. The interest rate applied to calculate the capitalized borrowing costs in 2018 is 3.22% (2017: 3.37% to 3.54%).

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Investment Properties

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Investment Properties

12. Investment Properties

Changes in investment properties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	302,750		￦	1,119,885		￦	78,765		￦	1,501,400
Less: Accumulated depreciation		—			(353,356	)		—			(353,356	)
Beginning, net		302,750			766,529			78,765			1,148,044
Acquisition		—			775			48,075			48,850
Disposal and termination		(3,493	)		(6,434	)		—			(9,927	)
Depreciation		—			(47,295	)		—			(47,295	)
Transfer from(to) property and equipment		64,449			(1,793	)		(1,184	)		61,472
Transfer and others		(6,916	)		80,986			(85,683	)		(11,613	)
Ending, net	￦	356,790		￦	792,768		￦	39,973		￦	1,189,531
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(398,919	)		—			(400,487	)

(In millions of Korean won)	2018
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation		(1,568	)		(398,919	)		—			(400,487	)
Beginning, net		356,790			792,768			39,973			1,189,531
Acquisition		1,111			7			74,145			75,263
Disposal and termination		(4,729	)		(10,238	)		—			(14,967	)
Depreciation		—			(44,653	)		—			(44,653	)
Transfer from(to) property and equipment		3,080			(5,366	)		(37,077	)		(39,363	)
Transfer and others		(7,404	)		9,597			(76,920	)		(74,727	)
Ending, net	￦	348,848		￦	742,115		￦	121		￦	1,091,084
Acquisition cost	￦	350,417		￦	1,168,379		￦	121		￦	1,518,917
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,569	)		(426,264	)		—			(427,833	)

The fair value of investment properties is ￦1,821,061 million as at December 31, 2018 (2017: ￦1,755,600 million). The fair value of investment properties is estimated based on the expected cash flow.

Rental income from investment properties is ￦207,795 million in 2018 (2017: ￦205,993 million) and direct operating expenses (including repairs and maintenance) arising from investment properties that generated rental income during the period are recognized as operating expenses.

Details of investment properties provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	583,778	￦	74,963	Deposits	￦	63,923
Land and Buildings	￦	7,897	￦	7,905	Borrowings	￦	5,270

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	548,567	￦	66,551	Deposits	￦	59,492
Land and Buildings	￦	5,292	￦	3,987	Borrowings	￦	3,322

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Intangible Assets

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Intangible Assets

13. Intangible Assets

Changes in intangible assets for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Goodwill			Development costs1			Software			Frequency usage rights			Others			Total
Acquisition cost		492,105			1,483,205			838,532			2,531,654			1,154,993			6,500,489
Less: Accumulated amortization (including accumulated impairment loss and others)		(238,619	)		(1,148,529	)		(641,394	)		(854,365	)		(594,779	)		(3,477,686	)
Beginning, net	￦	253,486		￦	334,676		￦	197,138		￦	1,677,289		￦	560,214		￦	3,022,803
Acquisition and capital expenditure		—			247,863			60,475			—			78,373			386,711
Disposal and termination		—			(14,806	)		(548	)		—			(11,859	)		(27,213	)
Amortization		—			(151,718	)		(73,174	)		(311,146	)		(99,112	)		(635,150	)
Impairment		(84,606	)		—			(3	)		—			(31,486	)		(116,095	)
Exclusion in scope of consolidation		—			(332	)		(3,216	)		—			(1,374	)		(4,922	)
Others		—			2,876			9,569			(1,201	)		(4,674	)		6,570
Ending, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,704
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,014
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)

1 The Group’s development costs mainly consist of acquisition costs to develop a combined billing system and an information management system.

	2018
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,013
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)
Beginning, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,703
Acquisition and capital expenditure		—			56,670			29,800			1,110,865			133,837			1,331,172
Disposal and termination		—			(3,436	)		(736	)		(558	)		(10,687	)		(15,417	)
Amortization		—			(147,304	)		(72,185	)		(318,815	)		(91,222	)		(629,526	)
Impairment		(518	)		—			(222	)		—			(12,256	)		(12,996	)
Inclusion in scope of consolidation		67,696			—			2,073			—			23,950			93,719
Others		—			10,621			16,973			66			(20,192	)		7,468
Ending, net	￦	236,058		￦	335,110		￦	165,944		￦	2,156,500		￦	513,511		￦	3,407,123
Acquisition cost		542,074			1,680,372			947,312			3,641,231			1,253,281			8,064,270
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,016	)		(1,345,262	)		(781,368	)		(1,484,731	)		(739,770	)		(4,657,147	)

The carrying amount of membership rights and others, excluding goodwill, with indefinite useful life not subject to amortization is ￦239,619 million (2017: ￦238,053) as at December 31, 2018.

The Group won a portion of the 3.5GHz and 28GHz bands at an auction in June 2018 under Article 11 (Assignment of Radio Frequencies for Consideration) of the Radio Waves Act. The purchase consideration for the right to use a radio frequency of the 3.5GHz and 28GHz bands are ￦968,000 million and ￦207,800 million, respectively. The group made down payments for the 3.5 GHz and 28 GHz bands in November 2018, and the remaining consideration for the 3.5 GHz and 28GHz bands will be paid in installments annually for 10 years and 5 years, respectively.

Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As at December 31, 2018, goodwill allocated to each cash-generation unit is as follows:

(In millions of Korean won) Cash generating Unit	Amount
Marketing/Customer
Telecom Wireless business1	￦	65,057
Finance
BC Card Co., Ltd.2		41,234
Others
GENIE Music Corporation (KT Music Corporation)3		55,114
PlayD Co., Ltd. (N SEARCH MARKETING Corporation)4		42,745
KT Telecop Co., Ltd.1		15,418
KT MOS Bukbu Co., Ltd and others		16,490
Total	￦	236,058

1 The recoverable amounts of mobile business are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 1.34% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 7.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on mobile business for the years ended December 31, 2018 and 2017.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 2.80% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 15.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018 and 2017.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on value in use calculation or fair value less cost to sell.

4 The recoverable amounts of PlayD Co., Ltd. (N search Marketing Co., Ltd.) are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 1.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 5.44% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.42% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on PlayD Co., Ltd. (N search Marketing Co., Ltd.) for the years ended December 31, 2018 and 2017.

In prior year, the recoverable amounts of Satellite TV segment are calculated based on value-in use calculations or fair value less costs to sell. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate (-0.77%) based on past performance and its expectation of future market changes. The Group determined cash flow projections based on past performance and its estimation of market growth. Specific risk of related operating segment was reflected in its 13.25% discount rate.

As a result of the impairment test, the Group recognized the impairment losses of ￦ 78,200 million on goodwill allocated to Satellite TV segment and ￦ 29,325 million on indefinite-lived intangible assets, and recognized the losses as operating expenses in the consolidated statement of profit or loss for the year ended December 31, 2017. It was resulted from intense competition between internets, IPTV, Cable TV service providers.

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Investments in Associates and Joint Ventures

12 Months Ended

Dec. 31, 2018

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Investments in Associates and Joint Ventures

14. Investments in Associates and Joint Ventures

Details of associates as at December 31, 2017 and 2018, are as follows:

	Percentage of ownership (%)						Location	Date of financial statements
	2017			2018
Korea Information & Technology Fund		33.3	%		33.3	%	Korea		December 31
KT-SB Venture Investment Fund1		50.0	%		50.0	%	Korea		December 31
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%	Korea		December 31
KT-CKP New Media Investment Fund		49.7	%		49.7	%	Korea		December 31
K Bank Inc.1		10.0	%		10.0	%	Korea		December 31

1 At the end of the reporting period, even though the Group (KT-SB Venture Investment Fund and KT-IBKC Future Investment Fund 1) has 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, cannot participate in determining the operating and financial policies. Also, 8.8% of non-voting convertible stock are excluded in deriving percentage of ownership of K bank Inc.

Changes in investments in associates and joint ventures for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures			Impairment			Others			Ending
Korea Information & Technology Fund	￦	134,969	￦	—		￦	4,275		￦	—		￦	290		￦	139,534
KT-SB Venture Investment Fund		4,736		(1,069	)		(725	)		—			—			2,942
Mongolian Telecommunications		6,244		—			(348	)		—			(5,896	)		—
KT Wibro Infra Co., Ltd.		52,200		(52,200	)		—			—			—			—
KT-IBKC Future Investment Fund1		3,621		7,500			(296	)		—			—			10,825
KT-CKP New Media Investment Fund		4,454		(2,970	)		810			—			—			2,294
K Bank Inc.		—		26,543			(17,244	)		—			32,809			42,108
Others		77,851		3,178			(1,952	)		(3,662	)		6,313			81,728
	￦	284,075	￦	(19,018	)	￦	(15,480	)	￦	(3,662	)	￦	33,516		￦	279,431

	2018
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Impairment		Others			Ending
Korea Information & Technology Fund	￦	139,534	￦	—		￦	15,037		￦	—	￦	(6,316	)	￦	148,255
KT-SB Venture Investment Fund		2,942		—			1,528			—		—			4,470
KT-IBKC Future Investment Fund1		10,825		(1,050	)		1,028			—		(842	)		9,961
KT-CKP New Media Investment Fund		2,294		(1,229	)		(784	)		—		—			281
K Bank Inc.		42,108		26,725			(19,504	)		—		3,326			52,655
Others2		81,728		2,466			8,607			—		(36,016	)		56,785
	￦	279,431	￦	26,912		￦	5,912		￦	—	￦	(39,848	)	￦	272,407

1 KT investment Co., Ltd., a subsidiary of the Group, recognized its share in net profit from associates and joint ventures as operating revenue and expense. These include its share in net loss from associates and joint ventures of ￦445 million (2017:￦1,588 million) recognized as operating expense during the period.

2 The Group classified total shares of PT Mitra Transksi Indonesia as assets held for sale (Note 10).

Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	144,874	￦	273,727	￦	—	￦	—
KT-SB Venture Investment		120		5,770		6		—
KT-IBKC Future Investment Fund 1		5,499		16,302		152		—
KT-CKP New Media Investment Fund		287		4,333		—		—
K Bank Inc.		1,258,969		92,137		1,116,154		1,177

(In millions of Korean won)	2017
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	36,462	￦	12,825		￦	1,868		￦	14,693		￦	739
KT-SB Venture Investment		3		(1,449	)		—			(1,449	)		—
KT-IBKC Future Investment Fund 1		15		(593	)		—			(593	)		—
KT-CKP New Media Investment Fund		1,593		1,632			—			1,632			—
K Bank Inc.		20,926		(83,787	)		(746	)		(84,533	)		—

(In millions of Korean won)	December 31, 2018
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	118,024	￦	326,740	￦	—	￦	—
KT-SB Venture Investment		4,322		4,624		6		—
KT-IBKC Future Investment Fund 1		19,922		—		—		—
KT-CKP New Media Investment Fund		25		540		—		—
K Bank Inc.		2,094,152		90,505		1,901,389		3,185

(In millions of Korean won)	2018
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	59,524	￦	45,110		￦	(13,422	)	￦	31,688		￦	1,842
KT-SB Venture Investment		—		3,056			—			3,056			—
KT-IBKC Future Investment Fund 1		2,665		2,057			—			2,057			—
KT-CKP New Media Investment Fund		371		(629	)		—			(629	)		—
K Bank Inc.		66,787		(79,671	)		1,432			(78,440	)		—

Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures as at and for the years end December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	418,601		33.33	%	￦	139,534	￦	—	￦	139,534
KT-SB Venture Investment		5,884		50.00	%		2,942		—		2,942
KT-IBKC Future Investment Fund 1		21,649		50.00	%		10,825		—		10,825
KT-CKP New Media Investment Fund		4,620		49.67	%		2,294		—		2,294
K Bank Inc.1		233,775		10.00	%		42,108		—		42,108

1 8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

	December 31, 2018
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	444,764		33.33	%	￦	148,255	￦	—	￦	148,255
KT-SB Venture Investment		8,940		50.00	%		4,470		—		4,470
KT-IBKC Future Investment Fund 1		19,922		50.00	%		9,961		—		9,961
KT-CKP New Media Investment Fund		565		49.70	%		280		—		280
K Bank Inc.1		280,083		10.00	%		52,655		—		52,655

1 8.8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

Due to discontinuance of equity method of accounting, the Group has not recognized loss from associates and joint ventures of ￦1,908 million for the year ended December 31, 2018 (for the year ended December 31, 2017: ￦4,391 million). The accumulated comprehensive loss of associates and joint ventures as at December 31, 2018, which was not recognized by the Group is ￦6,475 million (as at December 31, 2017: ￦17,045 million).

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Trade and Other Payables

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Trade and Other Payables

15. Trade and Other Payables

Details of trade and other payables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Current liabilities
Trade payables	￦	1,399,287	￦	1,236,489
Other payables		6,026,801		5,771,026
Total	￦	7,426,088	￦	7,007,515
Non-current liabilities
Trade payables	￦	4,787	￦	3,207
Other payables		996,582		1,510,657
Total	￦	1,001,369	￦	1,513,864

Details of other payables as at December 31, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Non-trade payables1	￦	4,775,177		￦	5,191,268
Accrued expenses		1,011,089			904,135
Operating deposits		850,999			819,968
Others		386,118			366,312
Less: non-current		(996,582	)		(1,510,657	)
Current	￦	6,026,801		￦	5,771,026

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦1,996,320 million related to credit card transactions are included as at December 31, 2018 (2017: ￦2,365,477 million).

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Borrowings

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Borrowings

16. Borrowings

Details of borrowings as at December 31, 2017 and 2018, are as follows:

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 07, 2034	6.50%		USD 100,000	￦	107,140			USD 100,000	￦	111,810
FR notes		Aug. 28, 2018	—		USD 300,000		321,420			—		—
MTNP notes		Apr. 22, 2019	2.63%		USD 350,000		374,990			USD 350,000		391,335
MTNP notes		Jan. 29, 2018	—		JPY 6,800,000		64,539			—		—
MTNP notes		Feb. 23, 2018	—		JPY 15,000,000		142,367			—		—
MTNP notes		July 18, 2026	2.50%		USD 400,000		428,560			USD 400,000		447,240
MTNP notes		Aug 07, 2022	2.63%		USD 400,000		428,560			USD 400,000		447,240
FR notes2		Aug 23, 2020	LIBOR(3M)+0.40%		—		—			USD 200,000		223,620
FR notes2		Aug 23, 2023	LIBOR(3M)+0.90%		—		—			USD 100,000		111,810
MTNP notes		July 06, 2020	0.31%		—		—			JPY 4,000,000		40,527
MTNP notes		July 06, 2021	0.38%		—		—			JPY 16,000,000		162,109
MTNP notes		Nov 13, 2020	0.30%		—		—			JPY 30,000,000		303,954
The 173-2nd Public bond		Aug. 06, 2018	—		—		100,000			—		—
The 179th Public bond		Mar. 29, 2018	—		—		260,000			—		—
The 180-2nd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
The 181-2nd Public bond		Aug. 26, 2018	—		—		90,000			—		—
The 181-3rd Public bond		Aug. 26, 2021	4.09%		—		250,000			—		250,000
The 182-2nd Public bond		Oct. 28, 2021	4.31%		—		100,000			—		100,000
The 183-2nd Public bond		Dec. 22, 2021	4.09%		—		90,000			—		90,000
The 183-3rd Public bond		Dec. 22, 2031	4.27%		—		160,000			—		160,000
The 184-1st Public bond		Apr. 10, 2018	—		—		120,000			—		—
The 184-2nd Public bond		Apr. 10, 2023	2.95%		—		190,000			—		190,000
The 184-3rd Public bond		Apr. 10, 2033	3.17%		—		100,000			—		100,000
The 185-1st Public bond		Sept. 16, 2018	—		—		200,000			—		—
The 185-2nd Public bond		Sept. 16, 2020	3.65%		—		300,000			—		300,000
The 186-2nd Public bond		June 26, 2019	3.08%		—		170,000			—		170,000
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2034	3.70%		—		100,000			—		100,000
The 187-2nd Public bond		Sept. 02, 2019	2.97%		—		220,000			—		220,000
The 187-3rd Public bond		Sept. 02, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 02, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	2.26%		—		160,000			—		160,000
The 188-2nd Public bond		Jan. 29, 2025	2.45%		—		240,000			—		240,000
The 188-3rd Public bond		Jan. 29, 2035	2.71%		—		50,000			—		50,000
The 189-1st Public bond		Jan. 28, 2019	1.76%		—		100,000			—		100,000
The 189-2nd Public bond		Jan. 28, 2021	1.95%		—		130,000			—		130,000
The 189-3rd Public bond		Jan. 28, 2026	2.20%		—		100,000			—		100,000
The 189-4th Public bond		Jan. 28, 2036	2.35%		—		70,000			—		70,000
The 190-1st Public bond		Jan. 29, 2021	2.55%		—		—			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		—			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		—			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		—			—		70,000
The 17th unsecured bond		Apr. 22, 2018	—		—		60,000			—		—
							5,987,576					6,029,645
Less: Current portion							(1,357,776	)				(880,940	)
Discount on bonds							(19,347	)				(20,056	)
Total						￦	4,610,453				￦	5,128,649

1 As at December 31, 2018, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered in the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTN Program has been suspended since 2007.

2 Libor (3M) are approximately 2.808 % as at December 31, 2018.

Short-term borrowings

	(In millions of Korean won)		December 31, 2017		December 31, 2018
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	3.78%	￦	—	￦	15,000
	Shinhan Bank	3.70% ~ 4.72%		113,300		59,800
	Sinhan Bank, Indonesia	8.90%		—		614
	Korea Development Bank	2.50% ~ 4.35%		12,000		16,200
	SooHyup Bank	4.57%		3,000		1,000
	Total		￦	128,300	￦	92,614

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Financial institution	Type	Annual interest rates		Foreign currency		Korean won			Foreign currency		Korean won
Export-Import Bank of Korea	Inter-Korean Cooperation Fund1		1.50%		—	￦	4,688			—	￦	3,948
Shinhan Bank	General loans		2.93%		—		30,000			—		5,000
	Facility loans		3.01%		—		6,000			—		30,000
	Vessel facility loans2		LIBOR(3M)+0.706%		USD 15,000		16,071			USD 9,000		10,063
KEB Hana Bank	General loans		3.95%		—		3,000			—		—
Standard Charted Bank	General loans		3.16%		—		8,000			—		6,000
NongHyup Bank	General loans		2.86%		—		8,000			—		8,000
	Facility loans		2.00%		—		123			—		104
Korea Development Bank	General loans		3.02%		—		—			—		10,000
	General loans		3.30%		—		30,000			—		30,000
Kookmin Bank	Facility loans		2.59%		—		2,333			—		—
NH Investment & Security Co., Ltd.	Commercial papers		3.17%		—		300,000			—		300,000
Others	Redeemable convertible preferred stock3		1.00%		—		950			—		950
	Kookmin Bank and other2		4.59%		USD 166,108		177,968			USD 127,023		142,025
						￦	587,133				￦	546,090
	Less: Current portion					￦	(87,398	)			￦	(394,927	)
	Total					￦	499,735				￦	151,163

1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period.

2 LIBOR(3M) is approximately 2.808% as at December 31, 2018.

3 Skylife TV Co., Ltd., a subsidiary of the Group, issued 1,900,000 of redeemable convertible preferred stock with a par value per share of ￦500 in 2010.

Repayment schedule of the Group’s borrowings including the portion of current liabilities as at December 31, 2018, is as follows:

(In millions of Korean won)
	Debentures						Borrowings						Total
	In local currency		In foreign currency		Sub- total		In local currency		In foreign currency		Sub- total
Jan 1, 2019 ~ Dec 31, 2019	￦	490,000	￦	391,335	￦	881,335	￦	436,518	￦	51,023	￦	487,541	￦	1,368,876
Jan 1, 2020 ~ Dec 31, 2020		460,000		568,101		1,028,101		1,468		47,054		48,522		1,076,623
Jan 1, 2021 ~ Dec 31, 2021		1,060,000		162,109		1,222,109		45,518		43,700		89,218		1,311,327
Jan 1, 2022 ~ Dec 31, 2022		—		447,240		447,240		518		10,925		11,443		458,683
After 2023		1,780,000		670,860		2,450,860		1,980		—		1,980		2,452,840
	￦	3,790,000	￦	2,239,645	￦	6,029,645	￦	486,002	￦	152,702	￦	638,704	￦	6,668,349

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Provisions

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Provisions

17. Provisions

Changes in provisions for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	19,038		￦	101,312		￦	76,829		￦	197,179
Increase (Transfer)		3,842			2,827			41,550			48,219
Usage		(1,740	)		(2,178	)		(22,382	)		(26,300	)
Reversal		(2,834	)		(1,723	)		(11,467	)		(16,024	)
Change in scope of consolidation		—			(22	)		(22	)		(44	)
Ending balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Current		17,238			1,766			59,168			78,172
Non-current		1,068			98,450			25,340			124,858
	2018
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Increase (Transfer)		44,593			25,975			33,378			103,946
Usage		(3,002	)		(3,181	)		(11,780	)		(17,963	)
Reversal		(1,137	)		(4,182	)		(1,818	)		(7,137	)
Ending balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Current		14,513			1,736			101,632			117,881
Non-current		44,247			117,092			2,656			163,995

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Net Defined Benefit Liabilities

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Net Defined Benefit Liabilities

18. Net Defined Benefit Liabilities

The amounts recognized in the statements of financial position are determined as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Present value of defined benefit obligations	￦	1,911,166		￦	2,201,876
Fair value of plan assets		(1,519,779	)		(1,643,046	)
Liabilities	￦	395,079		￦	561,269
Assets in the statement of financial position	￦	3,692		￦	2,439

Changes in the defined benefit obligations for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,713,184		￦	1,911,166
Current service cost		210,336			225,667
Interest expense		38,994			51,691
Benefit paid		(154,600	)		(121,372	)
Changes due to settlements of plan		(61	)		9,801
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		3,353			4,600
Actuarial gains and losses arising from changes in financial assumptions		36,946			116,458
Actuarial gains and losses arising from experience adjustments		63,583			(19,919	)
Changes in scope of Consolidation		(569	)		23,784
Ending	￦	1,911,166		￦	2,201,876

Changes in the fair value of plan assets for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,334,780		￦	1,519,779
Interest income		30,303			41,233
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(5,557	)		1,409
Benefits paid		(130,510	)		(116,303	)
Employer contributions		290,895			179,100
Changes in scope of consolidation		(132	)		17,828
Ending	￦	1,519,779		￦	1,643,046

Amounts recognized in the statement of profit or loss for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Current service cost	￦	205,114		￦	210,336		￦	225,667
Net Interest cost		12,141			8,691			10,458
Past service cost		424			(61	)		9,801
Transfer out		(8,737	)		(9,196	)		(13,881	)
Total expenses	￦	208,942		￦	209,770		￦	232,045

Principal actuarial assumptions used are as follows:

	December 31, 2016	December 31, 2017	December 31, 2018
Discount rate	2.43%	2.76%	2.77%
Future salary increase	4.10%	4.51%	4.61%

The sensitivity of the defined benefit obligations as at December 31, 2018, to changes in the principal assumptions is:

(In percentage, in millions of Korean won)	Effect on defined benefit obligation
	Changes in assumption	Increase in assumption			Decrease in assumption
Discount rate	0.5% point	￦	(72,851	)	￦	82,527
Salary growth rate	0.5% point		75,647			(63,267	)

A decrease in corporate bond yields will increase plan liabilities, although this will be partially offset by an increase in the value of the plans’ bond holdings.

The above sensitivity analyses are based on an assumption while holding all other assumptions constant. In practice, this is unlikely to occur, and changes in some of the assumptions may be correlated. The sensitivity of the defined benefit obligation to changes in principal actuarial assumptions is calculated using the projected unit credit method, the same method applied when calculating the defined benefit obligations recognized on the statement of financial position.

The Group actively monitors how the duration and the expected yield of the investments match the expected cash outflows arising from the pension obligations. Expected contributions to post-employment benefit plans for the year ending December 31, 2019, are ￦320,899 million.

The expected maturity analysis of undiscounted pension benefits as at December 31, 2018, is as follows:

(In millions of Korean won)	Less than 1 year		Between 1-2 years		Between 2-5 years		Over 5 years		Total
Pension benefits	￦	183,106	￦	225,706	￦	726,283	￦	3,972,768	￦	5,107,863

The weighted average duration of the defined benefit obligations is 7.4 years.

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Defined Contribution Plan

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Defined Contribution Plan

19. Defined Contribution Plan

Recognized expense related to the defined contribution plan for the year ended December 31, 2018, is ￦48,210 million (2016: ￦46,023 million, 2017: ￦45,936 million).

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Commitments and Contingencies

20. Commitments and Contingencies

As at December 31, 2018, major commitments with local financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency		Limit		Used amount
Bank overdraft	Kookmin Bank and others		KRW		1,697,000		—
Commercial papers	NH Investment & Securities Co., Ltd.		KRW		300,000		300,000
Inter-Korean Cooperation Fund	Export-Import Bank of Korea		KRW		37,700		3,948
Collateralized loan on electronic accounts receivable-trade	Shinhan Bank and others		KRW		495,560		70,759
Plus electronic notes payable	Industrial Bank of Korea		KRW		50,000		960
Loans for working capital	Korea Development Bank and others		KRW		254,300		158,000
Facility loans	Shinhan Bank and others		KRW		10,123		8,406
	Kookmin Bank and others		USD		212,000		127,024
Facility loans on ships	Shinhan Bank		USD		9,000		9,000
Export L/C	Shinhan Bank		USD		—		1,156
Derivatives transaction limit	Korea Development Bank		KRW		100,000		64,622
FX forward trading commitment	Shinhan Bank		USD		11,500		—
Total			KRW		2,944,683		606,695
			USD		232,500		137,180

As at December 31, 2018, guarantees received from financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency			Limit
Performance guarantee	Seoul Guarantee Insurance and others		KRW			299,689
			USD			1,200
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD			5,980
Guarantee for payment in Korean currency	Shinhan Bank and others		KRW			5
Guarantee for payment in foreign currency	KEB Hana and others		USD			51,766
			PLN	1		23,000
Comprehensive credit line	KEB Hana Bank and others		KRW			40,000
Comprehensive credit line	KEB Hana Bank		USD			10,000
Bid guarantee	KEB Hana Bank		USD			400
Bid guarantee			KRW			58,992
Performance guarantee /Warranty Guarantee	Korea Software Financial Cooperative and others		KRW			376,420
Guarantee for advances received/others			KRW			124,901
Bid guarantee			KRW			350
Warranty guarantee			KRW			1,037
Guarantees for licensing			KRW			4,070
Performance guarantee/Warranty Guarantee	Seoul Guarantee Insurance		KRW			996
Guarantee for public sale			KRW			120
Guarantee for deposits			KRW			3,525
Total			KRW			910,105
			USD			69,346
			PLN	1		23,000

1 Polish Zloty.

As at December 31, 2018, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won and thousands of foreign currencies)	Subject to payment guarantees	Creditor	Currency		Limit		Used amount		Period
KT Estate Inc.	Busan Gaya Centreville Buyers	Shinhan Bank		KRW		4,854		2,503		Nov 10, 2017 ~Oct. 31, 2020
KT Estate Inc.	Daegu Beomeo-Crossroads SeohanIDaum Buyers	Shinhan Bank		KRW		8,172		4,271		Oct 29, 2017 ~Nov. 30, 2020
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		KRW		538		—		Apr 19, 2018 ~Apr 19, 2019
KT Hitel Co., Ltd.	Korea Software Financial Cooperative	Yonsei University and others		KRW		34,715		1,616		Oct 22, 2018 ~Oct 22, 2021
BC Card Co., Ltd	PT BCcard Asia Pacific	Shinhan Bank, Indonesia		IDR		8,000,000		8,000,000		Sep 18, 2018 ~Sep 17, 2019

The Controlling Company is jointly and severally obligated with KT Sat Co., Ltd. to pay KT Sat Co., Ltd.’s liabilities incurred prior to spin-off. As at December 31, 2018, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ￦3,480 million.

For the year ended December 31, 2018, the Group made agreements with the Securitization Specialty Companies (2018: Giga LTE Thirty seventh to Forty second Securitization Specialty Co., Ltd., 2017: Giga LTE Thirty first to Thirty sixth Securitization Specialty Co., Ltd.), and disposed of its trade receivables related to handset sales. The Group also made asset management agreements with each securitization specialty company and in accordance with the agreement the Group will receive asset management fees upon liquidation of securitization specialty company.

As at December 31, 2018, the Group is a defendant in 172 lawsuits with the total claimed amount of ￦169,246 million (2017: ￦112,639 million). As at December 31, 2018, litigation provisions of ￦58,776 million for pending lawsuits and unasserted claims are recorded as liabilities for potential loss in the ordinary course of business. The final outcomes of the cases cannot be estimated at the end of the reporting period.

In December 2013, Asia Broadcast Satellite Holdings Ltd. (“ABS”) filed a request for meditation to the International Chamber of Commerce (“ICC”) for the compensation of damages from the ownership of the satellite Koreasat-3 (“K3”) and the alleged breach of the entrustment control contract related to K3, which was made and entered into with the Controlling Company and its subsidiary, KT Sat Co., Ltd. In July 2017, the ICC issued a partial ruling that ABS has the ownership of K3, and in March 2018, the final ruling was issued that KT Sat co., Ltd. should pay compensation for damages to ABS. However, in October 2017, the Controlling Company and its subsidiary, KT Sat Co., Ltd. filed a lawsuit seeking the cancellation of the partial ruling in the Federal Court of New York, and filed the other lawsuit in May 2018 seeking the cancellation of the final ruling. The Federal Court of New York dismissed the first case in April and the second case in July 2018. The Controlling Company and its subsidiary, KT Sat Co., Ltd. filed an appeal to the US Court of Appeals for the Second Circuit in August 2018. The outcome of the appeal cannot be reasonably estimated at the end of the reporting period.

According to the financial and other covenants included in certain debentures and borrowings, the Group is required to maintain certain financial ratios such as debt-to-equity ratio, use the funds for the designated purpose and report to the creditors periodically. The covenant also contains restriction on provision of additional collateral and disposal of certain assets.

At the end of the reporting period, the Group is offering construction completion guarantee agreement to development of Nonsan Hwagidong apartment complex. If a contingent event occurs in between November 24, 2017 and to August 9, 2019, the Group collaterally guarantees the debt of AbleNS 1st Co. up to ￦6,000 million.

At the end of the reporting period, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants.

At the end of the reporting period, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦1,474,009 million (2017: ￦622,059 million).

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Lease

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Lease

21. Lease

The Group’s non-cancellable lease arrangements as at December 31, 2018, are as follows:

Details of finance lease assets as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Acquisition costs	￦	325,975		￦	343,055
Less: Accumulated depreciation		(126,091	)		(152,244	)
Net balance	￦	199,884		￦	190,811

As at December 31, 2018, the Group recognized financial lease assets as other property and equipment. The related depreciation amounted to ￦63,070 million for the year ended December 31, 2018 (for the year ended December 31, 2017: ￦58,535 million).

Details of future minimum lease payments as at December 31, 2017 and 2018, under finance lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Total amount of minimum lease payments
Within one year	￦	88,441	￦	77,615
From one year to five years		132,113		124,498
More than five years		81		79
		220,635		202,192
Unrealized interest expense		43,758		38,334
Net amount of minimum lease payments
Within one year		68,651		59,324
From one year to five years		108,146		104,456
More than five years		80		78
Total	￦	176,877	￦	163,858

Details of future minimum lease payments as at December 31, 2017 and 2018, under operating lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Within one year	￦	109,258	￦	109,025
From one year to five years		266,434		263,395
Thereafter		1,635		1,153
Total	￦	377,327	￦	373,573

Operating lease expenses incurred for the years ended December 31, 2017 and 2018, amounted to ￦126,250 million and ￦132,225 million, respectively.

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Share Capital

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Share Capital

22. Share Capital

As at December 31, 2017 and 2018, the Group’s number of authorized shares is one billion.

December 31, 2017

December 31, 2018

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Ordinary shares1

261,111,808

￦

5,000

￦

1,564,499

261,111,808

￦

5,000

￦

1,564,499

1 The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

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Retained Earnings

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Retained Earnings

23. Retained Earnings

Details of retained earnings as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		4,527,539		5,822,458
Total	￦	9,961,150	￦	11,256,069

1 The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends, but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders.

2 The provision of research and development of human resources is separately accumulated with tax reserve fund during earned surplus disposal by Tax Reduction and Exemption Control Act of Korea. Reversal of this provision can be paid out as dividends according to related tax law.

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Accumulated Other Comprehensive Income and Other Components of Equity

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Accumulated Other Comprehensive Income and Other Components of Equity

24. Accumulated Other Comprehensive Income and Other Components of Equity

As at December 31, 2017 and 2018, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Changes in investments in associates and joint ventures	￦	(735	)	￦	(871	)
Loss on derivatives valuation		(3,463	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		—			96,704
Gain of valuation on available-for-sale		52,673			—
Exchange differences on translation for foreign operations		(17,490	)		(15,201	)
Total	￦	30,985		￦	50,158

Changes in accumulated other comprehensive income for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning			Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(10,883	)	￦	10,148		￦	—		￦	(735	)
Gain or loss on derivatives valuation		(34,309	)		(111,083	)		141,929			(3,463	)
Gain or loss of valuation on available-for-sale		54,106			54,017			(55,450	)		52,673
Exchange differences on translation for foreign operations		(10,346	)		(7,144	)		—			(17,490	)
Total	￦	(1,432	)	￦	(54,062	)	￦	86,479		￦	30,985

	2018
(In millions of Korean won)	Beginning			Changes in accounting policy		Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(735	)	￦	—	￦	(136	)	￦	—		￦	(871	)
Gain or loss on derivatives valuation		(3,463	)		—		17,268			(44,279	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		52,673			17,741		26,290			—			96,704
Exchange differences on translation for foreign operations		(17,490	)		—		2,289			—			(15,201	)
Total	￦	30,985		￦	17,741	￦	45,711		￦	(44,279	)	￦	50,158

The Group’s other components of equity as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Treasury stock1	￦	(853,108	)	￦	(830,874	)
Gain or loss on disposal of treasury stock2		873			(12,251	)
Share-based payments		6,483			5,956
Others3		(359,550	)		(343,914	)
Total	￦	(1,205,302	)	￦	(1,181,083	)

1 During the year ended December 31, 2018, the Group acquired treasury stock of 847,620 and disposed of 895,333 treasury shares.

2 The amount directly reflected in equity is ￦5,410 million (2017: ￦653 million) for the year ended December 31, 2018.

3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included.

As at December 31, 2017 and 2018, the details of treasury stock are as follows:

	December 31, 2017		December 31, 2018
Number of shares (in shares)		16,014,753		15,967,040
Amounts (In millions of Korean won)	￦	853,108	￦	830,874

Treasury stock is expected to be used for the stock compensation for the Group’s directors and employees and other purposes.

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Share-based Payments

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Share-based Payments

25. Share-based Payments

Details of share-based payments as at December 31, 2018, are as follows:

	12th grant
Grant date	August 2, 2018
Grantee	CEOs, inside directors, outside directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦28,350
Total compensation costs (in Korean won)	￦5,956 million
Estimated exercise date (exercise date)	During 2019
Valuation method	Fair value method

Changes in the number of stock options and the weighted-average exercise price as at December 31, 2017 and 2018, are as follows:

	2017
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
10th grant		318,506		—		193,094		125,412		—		—
11th grant		—		316,949		—		—		316,949		—
Total		318,506		316,949		193,094		125,412		316,949		—

	2018
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
11th grant		316,949		—		312,181		4,768		—		—
12th grant		—		353,325		—		—		353,325		—
Total		316,949		353,325		312,181		4,768		353,325		—

1 The closing price of ordinary shares at the time of exercise in 2018 was ￦27,300 (2017: ￦31,797).

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

26. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

The Group has recognized the following amounts relating to revenue in the statement of profit or loss:

(In millions of Korean won)	2018
Revenue from contracts with customers	￦	23,012,257
Revenue from other sources		423,793
Total revenue	￦	23,436,050

Operating revenues for the years ended December 31, 2018, are as follows:

(In millions of Korean won)	2018
Mobile services	￦	6,827,685
Fixed-line services:		4,869,253
Fixed-line and VoIP telephone services		1,708,319
Broadband Internet access services		2,112,763
Data communication services		1,048,171
Media and content		3,182,324
Financial services		3,444,917
Sale of goods		3,288,911
Others		1,822,960
Total	￦	23,436,050

Mobile and fixed-line service

Telecommunication service revenues include mobile and fixed-line(e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that is considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees).

Media and content services

Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading.

Media and contents services revenue are recognized when services are provided, based upon either usage or period of time.

Financial services

Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed.

Sale of goods

Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers.

The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract assets	￦	421,131	￦	398,797
Contract liabilities		282,836		347,461
Deferred revenue		88,732		96,198

The contract costs recognized as assets are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract costs recognized as assets	￦	1,306,409	￦	1,469,855

The Group recognized ￦1,397,318 million of operating expenses in the current reporting period which relates to contract cost assets.

In 2018, the recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905
Deferred revenue of joining/installment fee		39,975
Others		1,536
Total	￦	225,416

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Operating Expenses

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Operating Expenses

27. Operating Expenses

Operating expenses for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017			2018
Salaries and wages	￦	3,477,596	￦	3,568,456		￦	3,845,842
Depreciation		2,762,773		2,745,969			2,674,205
Amortization of intangible assets		582,493		618,533			607,527
Commissions		1,099,429		1,085,865			1,080,168
Interconnection charges		690,285		640,612			579,613
International interconnection fee		216,633		214,058			226,627
Purchase of inventories		3,407,263		4,053,693			4,414,094
Changes of inventories		162,323		(187,439	)		(432,607	)
Sales commission		1,968,035		2,201,778			1,942,841
Service cost		1,322,337		1,428,405			1,540,869
Utilities		323,406		323,313			323,411
Taxes and dues		255,480		279,574			285,131
Rent		455,457		448,772			460,377
Insurance premium		178,231		69,384			73,654
Installation fee		156,669		146,783			143,669
Advertising expenses		185,560		197,114			157,675
Research and development expenses		167,881		168,635			176,758
Card service cost		3,049,559		3,094,894			3,112,618
Others		1,319,688		1,379,438			1,122,718
Total	￦	21,781,098	￦	22,477,837		￦	22,335,190

Details of employee benefits for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Short-term employee benefits	￦	3,206,904	￦	3,297,944	￦	3,505,214
Post-employment benefits(Defined benefit plan)		208,942		209,770		232,045
Post-employment benefits(Defined contribution plan)		46,023		45,936		48,210
Post-employment benefits(Others)		8,017		6,949		51,934
Share-based payment		7,710		7,660		8,439
Total	￦	3,477,596	￦	3,568,259	￦	3,845,842

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Financial Income and Costs

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Financial Income and Costs

28. Financial Income and Costs

Details of financial income for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest income	￦	115,686	￦	93,078	￦	244,796
Gain on foreign currency transactions		24,915		79,653		17,175
Gain on foreign currency translation		12,165		225,580		3,691
Gain on settlement of derivatives		8,515		—		27,950
Gain on valuation of derivatives		109,436		57		66,305
Others		25,422		7,960		14,326
Total	￦	296,139	￦	406,328	￦	374,243

Details of financial costs for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest expenses	￦	337,219	￦	302,464	￦	296,874
Loss on foreign currency transactions		37,936		40,303		49,156
Loss on foreign currency translation		121,949		12,239		72,642
Loss on settlement of derivatives		632		58,569		—
Loss on valuation of derivatives		138		209,582		2,045
Loss on disposal of trade receivables		15,838		20,355		13,818
Impairment loss on available-for-sale financial assets		966		9		—
Others		409		1,010		1,124
Total	￦	515,087	￦	644,531	￦	435,659

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Deferred Income Tax and income Tax Expense

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Deferred Income Tax and income Tax Expense

29. Deferred Income Tax and income Tax Expense

The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	318,339		￦	428,690
Deferred tax assets to be recovered after more than 12 months		1,140,252			1,347,985
Deferred tax assets before offsetting		1,458,591			1,776,675
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(15,705	)		(413,409	)
Deferred tax liability to be recovered after more than 12 months		(859,126	)		(1,102,682	)
Deferred tax liabilities before offsetting		(874,831	)		(1,516,091	)
Deferred tax assets after offsetting	￦	712,222		￦	465,369
Deferred tax liabilities after offsetting	￦	128,462		￦	204,785

The gross movements on the deferred income tax account for the years ended December 31, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	563,729		￦	583,760
Changes in accounting policy		—			(374,307	)
Credited to the statement of profit or loss		(1,771	)		15,016
Charged to other comprehensive income		21,802			36,115
Ending	￦	583,760		￦	260,584

The movement in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdiction, is as follows:

(In millions of Korean won)	2017
	Beginning			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments	￦	(49,188	)	￦	49,188		￦	—		￦	—
Available-for-sale financial assets		(31,702	)		(164	)		1,346			(30,520	)
Investment in subsidiaries, associates, and joint ventures		(50,746	)		(42,659	)		(3,245	)		(96,650	)
Depreciation		(39,498	)		39,498			—			—
Advanced depreciation provision		(225,687	)		(22,905	)		—			(248,592	)
Deposits for severance benefits		(307,730	)		(80,126	)		—			(387,856	)
Accrued income		(2,024	)		(126	)		—			(2,150	)
Reserve for technology and human resource development		(747	)		433			—			(314	)
Others		(119,366	)		10,617			—			(108,749	)
Total	￦	(826,688	)	￦	(46,244	)	￦	(1,899	)	￦	(874,831	)
Deferred tax assets
Derivative instruments	￦	—		￦	34,572		￦	(9,848	)	￦	24,724
Provision for impairment or trade receivables		110,276			11,380			—			121,656
Inventory valuation		48			(48	)		—			—
Contribution for construction		18,091			180			—			18,271
Accrued expenses		80,356			10,683			—			91,039
Provisions		20,221			3,858			—			24,079
Property and equipment		232,915			(841	)		—			232,074
Defined benefit liabilities		372,492			67,751			26,806			467,049
Withholding of facilities expenses		6,910			472			—			7,382
Accrued payroll expenses		25,915			(10,786	)		—			15,129
Deduction of installment receivables		13,887			(13,887	)		—			—
Assets retirement obligation		18,086			2,750			—			20,836
Gain or loss foreign currency translation		67,701			(67,558	)		—			143
Deferred revenue		26,113			221			—			26,334
Real-estate sales		3,851			4,847			—			8,698
Tax credit carryforwards		199,599			(48,823	)		—			150,776
Tax loss carryforward		—			2,699			—			2,699
Others		193,956			47,003			6,743			247,702
Total	￦	1,390,417		￦	44,473		￦	23,701		￦	1,458,591
Net balance	￦	563,729		￦	(1,771	)	￦	21,802		￦	583,760

(In millions of Korean won)	2018
	Beginning			Changes in accounting policy			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Available-for-sale financial assets	￦	(30,520	)	￦	30,520		￦	—		￦	—		￦	—
Investment in subsidiaries, associates, and joint ventures		(96,650	)		—			2,867			179			(93,604	)
Depreciation		—			—			(424	)		—			(424	)
Advanced depreciation provision		(248,592	)		—			(64,592	)		—			(313,184	)
Deposits for severance benefits		(387,856	)		—			(11,126	)		—			(398,982	)
Accrued income		(2,150	)		—			592			—			(1,558	)
Reserve for technology and human resource development		(314	)		—			110			—			(204	)
Prepaid expenses		—			(352,139	)		(17,777	)		—			(369,916	)
Contract assets		—			(23,663	)		12,158			—			(11,505	)
Financial assets at fair value through profit or loss		—			(30,856	)		30,195			—			(661	)
Financial assets at fair value through other comprehensive income		—			(8,587	)		(17,638	)		(15,573	)		(41,798	)
Others		(108,749	)		—			(175,506	)		—			(284,255	)
Total	￦	(874,831	)	￦	(384,725	)	￦	(241,141	)	￦	(15,394	)	￦	(1,516,091	)
Deferred tax assets
Derivative instruments	￦	24,724		￦	—		￦	(26,128	)	￦	9,745		￦	8,341
Provision for impairment or trade receivables		121,656			(9,096	)		(12,673	)		—			99,887
Inventory valuation		—			—			121			—			121
Contribution for construction		18,271			—			(1,471	)		—			16,800
Unsettled expenses		106,168			—			21,729			—			127,897
Provisions		24,079			—			12,099			—			36,178
Property and equipment		232,074			—			(1,796	)		—			230,278
Defined benefit liabilities		467,049			—			3,980			42,813			513,842
Withholding of facilities expenses		7,382			—			(773	)		—			6,609
Deduction of installment receivables		—			—			42			—			42
Assets retirement obligation		20,836			—			3,696			—			24,532
Gain or loss foreign currency translation		143			—			10,529			—			10,672
Deferred revenue		26,334			15,809			(2,502	)		—			39,641
Real-estate sales		8,698			661			12,369			—			21,728
Tax loss carryforward		2,699			—			1,364			—			4,063
Trade receivables		—			2,890			(1,293	)		—			1,597
Others		247,702			154			284,742			(1,049	)		531,549
Total	￦	1,307,815		￦	10,418		￦	304,035		￦	51,509		￦	1,673,777
Temporary difference, net		432,984			(374,307	)		62,894			36,115			157,686
Tax credit carryforwards		150,776			—			(47,878	)		—			102,898
Total net balance	￦	583,760		￦	(374,307	)	￦	15,016		￦	36,115		￦	260,584

The tax impacts recognized directly to equity as at December 31, 2016, 2017, and 2018, are as follows:

	2016									2017									2018
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Loss on valuation of available-for-sale securities	￦	9,347		￦	(2,262	)	￦	7,085		￦	(5,561	)	￦	1,346		￦	(4,215	)	￦	—		￦	—		￦	—
Gain on valuation of financial assets at fair value through other comprehensive income		—			—			—			—			—			—			59,384			(15,573	)		43,811
Gain (loss) on valuation of hedge instruments		(14,611	)		3,536			(11,075	)		40,694			(9,848	)		30,846			(36,756	)		9,745			(27,011	)
Remeasurements of net defined benefit liabilities		5,558			(1,345	)		4,213			(110,768	)		26,806			(83,962	)		(116,324	)		42,813			(73,511	)
Share of gain(loss) of associates and joint ventures, and others		(641	)		155			(486	)		13,410			(3,245	)		10,165			(1,036	)		179			(857	)
Exchange differences on translation for foreign operations		(7,133	)		1,726			(5,407	)		(27,865	)		6,743			(21,122	)		3,989			(1,049	)		2,940
Total	￦	(7,480	)	￦	1,810		￦	(5,670	)	￦	(90,090	)	￦	21,802		￦	(68,288	)	￦	(90,743	)	￦	36,115		￦	(54,628	)

Details of income tax expense for the years ended December 31, 2016, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2016		2017		2018
Current income tax expense	￦	182,088	￦	268,885	￦	329,581
Impact of change in deferred taxes		152,102		1,771		(15,016	)
Income tax expense	￦	334,910	￦	270,656	￦	314,565

The tax on the Group’s profit before tax differs from the theoretical amount that would arise using the weighted average tax rate applicable to profits of the entities as follows:

(In millions of Korean won)	2016			2017			2018
Profit before income tax expense	￦	1,166,755		￦	816,997		￦	1,033,977
Statutory income tax expense	￦	282,355		￦	197,251		￦	273,982
Tax effect
Income not taxable for taxation purposes		(28,093	)		(19,268	)		(85,322	)
Non-deductible expenses		21,947			39,746			18,126
Tax credit		(13,764	)		(27,211	)		(20,319	)
Additional payment of income taxes		(4,780	)		976			11,439
Tax effect and adjustment on consolidation
Goodwill impairment		31,847			20,475			137
Eliminated dividend income form subsidiaries		40,087			34,305			31,966
Changes of out-side tax effect		(567	)		17,990			618
Investment in-kind		—			—			82,820
Others		5,878			6,392			1,118
Income tax expense	￦	334,910		￦	270,656		￦	314,565

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Earnings per Share

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Earnings per Share

30. Earnings per Share

Basic earnings per share is calculated by dividing the profit from operations attributable to equity holders of the Group by the weighted average number of ordinary shares outstanding during the period, excluding ordinary shares purchased by the Group and held as treasury stock.

Basic earnings per share from operations for the years ended December 31, 2016, 2017 and 2018, is calculated as follows:

	2016		2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090	￦	461,559	￦	645,571
Weighted average number of ordinary shares outstanding (In number of shares)		244,892,313		245,017,175		245,049,466
Basic earnings per share  (In Korean won)		3,043		1,884		2,634

Diluted earnings per share from operations is calculated by adjusting the weighted average number of ordinary shares outstanding to assume conversion of all dilutive potential ordinary shares. The Controlling Company has dilutive potential ordinary shares from convertible preferred stocks, stock options and other share-based payments.

Diluted earnings per share from operations for the years ended December 31, 2016, 2017 and 2018 is calculated as follows:

	2016			2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090		￦	461,559	￦	645,571
Adjusted net income attributable to ordinary shares (In millions of Korean won)		(67	)		—		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		745,023			461,559		645,571
Number of dilutive potential ordinary shares outstanding (In number of shares)		84,245			79,880		1,163
Weighted average number of ordinary shares outstanding (In number of shares)		244,976,558			245,097,055		245,050,629
Diluted earnings per share  (In Korean won)		3,041			1,883		2,634

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Dividend

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Dividend

31. Dividend

The dividends paid by the Group in 2018, 2017 and 2016 were ￦245,097 million (￦1,000 per share), ￦195,977 million (￦800 per share) and ￦122,425 million (￦500 per share), respectively. A dividend in respect of the year ended December 31, 2018, of ￦1,100 per share, amounting to a total dividend of ￦269,659 million, was approved at the shareholders’ meeting on March 29, 2019.

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Cash Generated from Operations

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Cash Generated from Operations

32. Cash Generated from Operations

Cash flows from operating activities for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
1. Profit for the year	￦	831,845		￦	546,341		￦	719,412
2. Adjustments to reconcile net income
Income tax expense		334,910			270,656			314,565
Interest income1		(130,066	)		(108,639	)		(265,817	)
Interest expense1		337,219			302,464			296,894
Dividends income		(3,926	)		(4,785	)		(2,910	)
Depreciation		2,821,779			2,802,531			2,735,413
Amortization of intangible assets		599,721			635,150			629,526
Provision for severance benefits		217,255			218,966			245,926
Impairment losses on trade receivables		92,711			45,704			113,064
Share of net profit or loss of associates and joint ventures		(2,547	)		15,480			5,912
Loss(gain) on disposal of associates and joint ventures		(1,450	)		979			(3,737	)
Impairment loss of associates and joint ventures		17,128			3,662			—
Loss on disposal of property and equipment and investment in properties		74,913			150,293			68,688
Loss(gain) on disposal of intangible assets		7,703			4,271			(4,256	)
Loss on impairment of intangible assets		135,264			116,095			12,997

(In millions of Korean won)	2016			2017			2018
Loss on foreign currency translation		109,784			(213,341	)		68,952
Loss(gain) on valuation and settlement of derivatives, net		(117,181	)		268,094			(92,210	)
Gain on disposal of financial assets at fair value through profit or loss		—			—			(1,712	)
Gain on valuation of financial assets at fair value through profit or loss		—			—			(10,768	)
Gain on disposal of financial assets at amortized cost		—			—			(44	)
Impairment losses on available-for-sale financial assets		966			9			—
Gain on disposal of available-for-sale financial assets		(22,695	)		(89,598	)		—
Others		64,863			(251,193	)		(55,969	)
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		216,818			(303,340	)		(81,217	)
Decrease(increase) in other receivables		(779,803	)		(346,013	)		356,643
Decrease(increase) in other current assets		48,549			11,792			(123,258	)
Decrease(increase) in other non-current assets		(51,765	)		(43,790	)		19,556
Decrease(increase) in inventories		167,873			(205,403	)		(480,543	)
Increase(decrease) in trade payables		(114,838	)		162,110			(167,841	)
Increase(decrease) in other payables		706,771			214,689			(448,301	)
Increase in other current liabilities		37,798			288,553			291,548
Increase in other non-current liabilities		30,762			174,618			144,072
Decrease(Increase) in provisions		(12,583	)		(12,574	)		85,946
Decrease(Increase) in deferred revenue		(69,179	)		(13,086	)		48,201
Increase in plan assets		(224,244	)		(203,420	)		(53,301	)
Payment of severance benefits		(121,835	)		(118,391	)		(153,209	)
4. Cash generated from operations (1+2+3)	￦	5,202,520		￦	4,318,884		￦	4,212,222

1 BC Card Co., Ltd. and other subsidiaries of the Group recognized interest income and expenses as operating income and expenses, respectively. Related interest income recognized as operating revenue is ￦21,021 million (2017: ￦15,561 million) and related interest expense recognized as operating expense is ￦21 million (2017: zero) for the year ended December 31, 2018.

The Group made agreements with securitization specialty companies and disposed of its trade receivables related to handset sales (Note 20). Cash flows from the disposals are presented in cash generated from operations.

Significant transactions not affecting cash flows for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Reclassification of the current portion of borrowings	￦	1,617,175		￦	1,416,066		￦	1,149,599
Reclassification of construction-in-progress to property and equipment		2,212,324			2,686,591			1,988,014
Reclassification of accounts payable from property and equipment		91,407			225,601			122,185
Reclassification of accounts payable from intangible assets		668,564			(227,108	)		584,595
Reclassification of payable from defined benefit liability		5,746			36,209			(31,838	)
Reclassification of payable from plan assets		(9,731	)		43,035			(9,497	)

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Changes in Liabilities Arising from Financing Activities

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Changes in Liabilities Arising from Financing Activities

33. Changes in Liabilities Arising from Financing Activities

Changes in liabilities arising from financial activities for the periods ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	8,120,791		￦	(1,163,917	)	￦	—	￦	(221,495	)	￦	—		￦	(2,206	)	￦	(49,511	)	￦	6,683,662
Financial lease liabilities		180,714			(71,735	)		68,938		—			—			—			(1,039	)		176,878
Derivative liabilities		16,901			—			—		130,674			(28,015	)		—			(20,740	)		98,820
Derivative assets		(227,318	)		71,370			—		76,552			(2,687	)		—			74,694			(7,389	)
Total	￦	8,091,088		￦	(1,164,282	)	￦	68,938	￦	(14,269	)	￦	(30,702	)	￦	(2,206	)	￦	3,404		￦	6,951,971
(In millions of Korean won)	2018
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	6,683,662		￦	(139,715	)	￦	—	￦	70,095		￦	—		￦	15,000		￦	19,252		￦	6,648,294
Financial lease liabilities		176,878			(73,885	)		61,187		—			—			—			(322	)		163,858
Derivative liabilities		98,820			(14,587	)		—		(37,344	)		35,809			—			(17,631	)		65,067
Derivative assets		(7,389	)		11,126			—		(22,474	)		(3,419	)		—			(7,687	)		(29,843	)
Total	￦	6,951,971		￦	(217,061	)	￦	61,187	￦	10,277		￦	32,390		￦	15,000		￦	(6,388	)	￦	6,847,376

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Segment Information

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Segment Information

34. Segment Information

The Group’s operating segments are as follows:

Details	Business service
Marketing/Customer	Mobile/fixed line telecommunication service and convergence business
Corporate customer business	B2B business and others
Finance	Credit card business and others
Satellite TV	Satellite TV business
Others	IT, facility security and global business, and others

Details of each segment for the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016
(In millions of Korean won)	Operating revenues			Operating income			Depreciation and Amortization
Marketing/Customer	￦	16,187,739		￦	1,093,377		￦	2,870,161
Finance		3,577,549			208,566			28,868
Satellite TV		668,945			79,987			98,895
Others		6,308,203			40,047			339,429
		26,742,436			1,421,977			3,337,353
Elimination		(3,578,234	)		(38,873	)		7,913
Consolidated amount	￦	23,164,202		￦	1,383,104		￦	3,345,266

	2017
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	16,242,552		￦	1,018,593		￦	2,895,930
Finance		3,637,917			205,678			28,827
Satellite TV		685,822			75,373			99,216
Others		6,651,552			(187,090	)		332,153
		27,217,843			1,112,554			3,356,126
Elimination		(3,670,914	)		(43,462	)		8,376
Consolidated amount	￦	23,546,929		￦	1,069,092		￦	3,364,502

	2018
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	14,061,629		￦	886,515		￦	2,293,809
Corporate customer business1		2,509,880			208,584			546,635
Finance		3,560,417			145,463			22,504
Satellite TV		690,821			66,735			98,310
Others		6,349,546			(154,130	)		313,511
		27,172,293			1,153,167			3,274,769
Elimination		(3,736,243	)		(52,307	)		6,963
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 The reporting segment of the current period has changed. However, the reporting segment of the prior period has not been restated to reflect the change.

Operating revenues for the year ended December 31, 2016, 2017 and 2018 and non-current assets as at December 31, 2017 and 2018 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues			Non-current assets1
Location	2016	2017	2018	2017.12.31	2018.12.31
Domestic	￦23,069,579	￦23,481,703	￦23,376,218	￦17,246,640	￦17,426,879
Overseas	94,623	65,226	59,832	137,914	139,585
Total	￦23,164,202	￦23,546,929	￦23,436,050	￦17,384,554	￦17,566,464

1 Non-current assets include property, plant and equipment, intangible assets and investment properties.

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Related Party Transactions

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Related Party Transactions

35. Related Party Transactions

The list of related party of the Group as at December 31, 2018, is as follows:

Relationship

Name of Entry

Associates and joint ventures

Korea Information & Technology Investment Fund, K- Realty CR-REITs No.1, KT-SB Venture Investment Fund, Boston Global Film & Contents Fund L.P., QTT Global (Group) Company Limited, CU Industrial Development Co., Ltd., PHI Healthcare. (HooH Healthcare Inc.), KD Living, Inc., Oscar Ent. Co., Ltd., KT-CKP New Media Investment Fund, LoginD Co., Ltd., K-REALTY CR-REIT 6, K Bank, Inc., ISU-kthContents Investment Fund, Daiwon Broadcasting Co., Ltd., KT-DSC creative economy youth start-up investment fund, Gyeonggi-KT Green Growth Fund, Korea electronic Vehicle charging service, PT. Mitra Transaksi Indonesia, K-REALTY RENTAL HOUSING REIT 2, AI RESEARCH INSTITUTE, KT-IBKC Future Investment Fund 1, Gyeonggi-KT Yoojin Superman Fund, FUNDA Co., Ltd., FUNDA Co., Ltd., CHAMP IT Co., Ltd., GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company, Alliance Internet Corp., JB Emerging Market Specialty Investment Private Equity Trust No.1, Little big pictures.

Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2017 and 2018, are as follows:

		December 31, 2017
		Receivables						Payables
(In millions of Korean won)		Trade receivables		Loans		Other receivables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	778	￦	—	￦	33,800	￦	—
	MOS GS Co., Ltd.		17		—		—		392
	MOS Daegu Co., Ltd.		1		—		—		1,388
	MOS Chungcheong Co., Ltd.		1		—		290		1,827
	MOS Gangnam Co., Ltd.		6		—		1		287
	MOS GB Co., Ltd.		17		—		1		778
	MOS BS Co., Ltd.		34		—		1		46
	MOS Honam Co., Ltd.		2		—		1		384
	K Bank, Inc.		1,338		—		7,994		296
	NgeneBio		1		2,510		—		3
	Others		54		—		1,281		2,135
	Total	￦	2,249	￦	2,510	￦	43,369	￦	7,536

		December 31, 2018
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Trade payables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	674	￦	30,910	￦	—	￦	—
	K Bank, Inc.		627		12,435		—		296
	Others		777		1,225		4		1,116
	Total	￦	2,078	￦	44,570	￦	4	￦	1,412

Significant transactions with related parties for the years ended December 31, 2016, 2017 and 2018, are as follows:

		2016
(In millions of Korean won)		Sales		Purchases2
Associates and joint ventures	KT Wibro Infra Co., Ltd.	￦	11	￦	391
	Smart Channel Co., Ltd.1		766		—
	K- Realty CR-REITs No.1		1,989		37,469
	MOS GS Co., Ltd.		663		17,361
	MOS Daegu Co., Ltd.		291		12,220
	MOS Chungcheong Co., Ltd.		408		13,469
	MOS Gangnam Co., Ltd.		412		15,797
	MOS GB Co., Ltd.		891		21,802
	MOS BS Co., Ltd.		441		15,346
	MOS Honam Co., Ltd.		418		14,389
	Others		1,719		29,422
	Total	￦	8,009	￦	177,666

1 The transactions for the year ended December 31, 2016, before Smart Channel Co., Ltd. was included in the consolidation scope.

2 Amounts include acquisition of primarily property and equipment.

		2017
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,233	￦	35,532
	MOS GS Co., Ltd.		704		16,946
	MOS Daegu Co., Ltd.		335		8,514
	MOS Chungcheong Co., Ltd.		455		15,542
	MOS Gangnam Co., Ltd.		484		16,380
	MOS GB Co., Ltd.		987		21,651
	MOS BS Co., Ltd.		460		15,957
	MOS Honam Co., Ltd.		493		14,294
	K Bank, Inc.		29,939		59
	NgeneBio2		43		—
	Others		1,149		11,384
	Total	￦	37,282	￦	156,259

1 The amount includes acquisition of primarily property and equipment.

2 It is the amount after excluded from consolidation during the year.

		2018
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,088	￦	31,984
	MOS GS Co., Ltd.2		493		12,023
	MOS Daegu Co., Ltd.2		229		8,775
	MOS Chungcheong Co., Ltd.2		540		9,159
	MOS Gangnam Co., Ltd.2		333		11,549
	MOS GB Co., Ltd.2		1,378		16,519
	MOS BS Co., Ltd.2		324		11,193
	MOS Honam Co., Ltd.2		331		10,499
	K Bank, Inc.		15,705		7,004
	NgeneBio3		3		—
	Others		2,888		9,547
	Total	￦	24,312	￦	128,252

1 Amounts include acquisition of primarily property and equipment.

2 It is the amount before excluded from consolidation during the year.

3 It is the amount before excluded from associates during the year

Key management compensation for the years ended December 31, 2016, 2017 and 2018, consists of:

(In millions of Korean won)	2016		2017		2018
Salaries and other short-term benefits	￦	2,629	￦	2,879	￦	2,762
Post-employment benefits		381		311		751
Stock-based compensation		1,237		1,331		878
Total	￦	4,247	￦	4,521	￦	4,391

Fund transactions with related parties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Equity contributions in cash		Dividend income
Associates and joint ventures
PT. Mitra Transaksi Indonesia	￦	5,194	￦	—
KT-IBKC future investment fund 1		7,500		—
CHAMP IT Co., Ltd.		750		—
Korea Electronic Vehicle Charging Service		864		—
Gyeonggi-KT Yoojin Superman Fund		1,000		—
K-REALTY CR REIT 1		—		5,392
K Bank, Inc.		26,543		—
Korea Information & Technology Investment Fund		—		739
MOS GS Co., Ltd.		—		12
MOS Daegu Co., Ltd.		—		12
MOS Chungcheong Co., Ltd.		—		12
MOS Gangnam Co., Ltd.		—		10
MOS GB Co., Ltd.		—		15
MOS BS Co., Ltd.		—		10
MOS Honam Co., Ltd.		—		10
Total	￦	41,851	￦	6,212

(In millions of Korean won)	2018
	Equity contributions in cash and others			Dividend income
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000		￦	—
KT-CKP New Media Investment Fund		(1,229	)		—
PT. Mitra Transaksi Indonesia1		1,567			—
Gyeonggi-KT Yoojin Superman Fund		1,000			—
KT-DSC creative economy youth start-up investment fund		(1,800	)		—
KT-IBKC future investment fund 1		(1,050	)		—
Korea Electronic Vehicle Charging Service		168			—
K Bank, Inc.		26,725			—
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company		(3,423	)		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		3,960			202
K-REALTY CR REIT 1		—			8,932
Korea Information & Technology Investment Fund		—			1,842
MOS GS Co., Ltd.2		(147	)		8
MOS Daegu Co., Ltd.2		(147	)		8
MOS Chungcheong Co., Ltd.2		(153	)		8
MOS Gangnam Co., Ltd.2		(180	)		10
MOS GB Co., Ltd.2		(203	)		12
MOS BS Co., Ltd.2		(183	)		10
MOS Honam Co., Ltd.2		(206	)		10
Daiwon Broadcasting Co., Ltd.		—			85
Boston Global Film & Contents Fund L.P.		(986	)		—
Gyeonggi-KT Green Growth Fund		—			19
Total	￦	24,713		￦	11,146

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

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Financial Risk Management

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Financial Risk Management

36. Financial Risk Management

(1) Financial Risk Factors

The Group’s activities expose it to a variety of financial risks: market risk (including currency risk, fair value interest rate risk, cash flow interest rate risk and price risk), credit risk and liquidity risk. The Group’s overall risk management program focuses on the unpredictability of financial markets and seeks to minimize potential adverse effects on the Group’s financial performance. The Group uses derivative financial instruments to hedge certain risk exposures such as cash flow risk.

The Group’s financial policy is set up in the long-term perspective and annually reported to the Board of Directors. The financial risk management is carried out by the Value Management Office, which identifies, evaluates and hedges financial risks. The treasury department in the Value Management Office considers various finance market conditions to estimate the effect from the market changes.

1) Market risk

The Group’s market risk management focuses on controlling the extent of exposure to the risk in order to minimize revenue volatility. Market risk is a risk that decreases value or profit of the Group’s portfolio due to changes in market interest rate, foreign exchange rate and other factors.

(i) Sensitivity analysis

Sensitivity analysis is performed for each type of market risk to which the Group is exposed. Reasonably possible changes in the relevant risk variable such as prevailing market interest rates, currency rates, equity prices or commodity prices are estimated and if the rate of change in the underlying risk variable is stable, the Group does not alter the chosen reasonably possible change in the risk variable. The reasonably possible change does not include remote or ‘worst case’ scenarios or ‘stress tests’.

(ii) Foreign exchange risk

The Group is exposed to foreign exchange risk arising from operating, investing and financing activities. Foreign exchange risk is managed within the range of the possible effect on the Group’s cash flows. Foreign exchange risk (i.e. foreign currency translation of overseas operating assets and liabilities) unaffecting the Group’s cash flows is not hedged but can be hedged at a particular situation.

As at December 31, 2016, 2017 and 2018, if the foreign exchange rate had strengthened/weakened by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of foreign exchange rate			Income before tax1			Shareholders’ equity
2016.12.31		10	%		(28,134	)		(23,817	)
		-10	%		28,134			23,817
2017.12.31		10	%		(10,132	)		(7,273	)
		-10	%		10,132			7,273
2018.12.31		10	%		(2,350	)		633
		-10	%		(2,851	)		(62	)

1 Computed with considering derivatives hedging effect applied by the Group to hedge foreign exchange risk of liabilities in foreign currencies

The above analysis is a simple sensitivity analysis which assumes that all the variables other than foreign exchange rates are held constant. Therefore, the analysis does not reflect any correlation between foreign exchange rates and other variables, nor the management’s decision to decrease the risk.

Details of financial assets and liabilities in foreign currencies as at December 31, 2016, 2017 and 2018, are as follows:

(In thousands of foreign currencies)	2016				2017				2018
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		210,474		2,536,090		236,476		1,908,831		279,327		1,893,782
SDR1		311		737		306		738		267		730
JPY		80,555		21,802,051		28,267		21,801,443		66,078		50,000,000
GBP		1		151		—		74		—		256
EUR		40		2,571		186		3,625		2		6
DZD2		471		—		47		—		618		—
CNY		15,262		381		46,555		10		16,315		271
UZS3		39,531		—		136,787		—		121,053		—
RWF4		1,203		—		3,346		—		857		—
THB5		—		—		—		—		1,685		1,685
IDR6		15,646,011		53,142,167		14,886,393		710,162		64,240,286		41,510,330
MMK7		2,750		—		84		—		84		—
TZS8		29,987		—		317,348		—		—		2,876
BWP9		15		—		42		—		897		—
HKD		254		—		—		—		—		—
BDT10		69,473		—		38,074		—		39,494		—
PLN11		106,025		—		338		—		26		—
VND12		515,412		—		311,649		—		467,272		—
XAF13		—		—		—		—		666		—
CHF14		—		—		—		12		—		—

1 Special Drawing Rights.

2 Algeria Dinar.

3 Uzbekistan Sum.

4 Rwanda Franc.

5 Thailand Bhat.

6 Indonesia Rupiah.

7 Myanmar Kyat.

8 Tanzanian Shilling.

9 Botswana Pula.

10 Bangladesh Taka.

11 Polish Zloty.

12 Vietnam Dong.

13 Central African Franc.

14 Confoederatio Helvetia Franc.

(iii) Price risk

As at December 31, 2016, 2017 and 2018, the Group is exposed to equity securities price risk because the securities held by the Group are traded in active markets. If the market prices had increased/decreased by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of price	Income before tax			Equity
2016.12.31	10%	￦	—		￦	539
	-10%		—			(539	)
2017.12.31	10%	￦	—		￦	686
	-10%		—			(686	)
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)

The above analysis is based on the assumption that the equity index had increased/decreased by 10% with all other variables held constant and all the Group’s marketable equity instruments had moved according to the historical correlation with the index. Gain or loss on equity securities classified as financial assets at fair value through profit or loss and financial assets at fair value through other comprehensive income can increase or decrease equity.

(iv) Cash flow and fair value interest rate risk

The Group’s interest rate risk arises from liabilities in foreign currency such as foreign currency debentures. Debentures in foreign currency issued at variable rates expose the Group to cash flow interest rate risk which is partially offset by swap transactions. Debentures and borrowings issued at fixed rates expose the Group to fair value interest rate risk. The Group sets the policy and operates to minimize the uncertainty of the changes in interest rates and financial costs.

As at December 31, 2016, 2017 and 2018, if the market interest rate had increased/decreased by 100 bp with other variables held constant, the effects on profit before income tax and shareholders’ equity would be as follows:

(In millions of Korean won)	Fluctuation of interest rate	Income before tax			Shareholders’ equity
2016.12.31	+ 100 bp	￦	(3,456	)	￦	(1,673	)
	- 100 bp		3,445			(5,025	)
2017.12.31	+ 100 bp	￦	1,942		￦	4,868
	- 100 bp		(1,954	)		(5,198	)
2018.12.31	+ 100 bp	￦	1,059		￦	9,689
	- 100 bp		(1,958	)		(10,237	)

The above analysis is a simple sensitivity analysis which assumes that all the variables other than market interest rates are held constant. Therefore, the analysis does not reflect any correlation between market interest rates and other variables, nor the management’s decision to decrease the risk.

2) Credit risk

Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises principally from the Group’s trade receivables from customers, debt securities and others.

- Risk management

Credit risk is managed on the Group basis with the purpose of minimizing financial loss. Credit risk arises from the normal transactions and investing activities, where clients or other party fails to discharge an obligation on contract conditions. To manage credit risk, the Group considers the counterparty’s credit based on the counterparty’s financial conditions, default history and other important factors.

Credit risk arises from cash and cash equivalents, derivative financial instruments and deposits with banks and financial institutions, as well as outstanding receivables. To minimize such risk, only the financial institutions with strong credit ratings are accepted.

The Group’s investments in debt instruments are considered to be low risk investments. The credit ratings of the investments are monitored for credit deterioration.

- Security

For some trade receivables, the Group may obtain security in the form of guarantees or letters of credit, etc. which can be called upon if the counterparty is in default under the terms of the agreement.

- Impairment of financial assets

The Group has four types of financial assets that are subject to the expected credit loss model:

• trade receivables for sales of goods and provision of services,

• contract assets relating to provision of services,

• debt investments carried at fair value through other comprehensive income, and

• other financial assets carried at amortized cost.

While cash equivalents are also subject to the impairment requirement, the identified impairment loss was immaterial.

As at December 31, 2017 and 2018, maximum exposure to credit risk is as follows.

(In millions of Korean won)	December 31, 2017		December 31, 2018
Cash and cash equivalents (except for cash on hand)	￦	1,926,620	￦	2,284,885
Trade and other receivables
Financial assets at amortized costs		6,793,397		5,425,996
Financial assets at fair value through other comprehensive income		—		1,097,348
Contract assets		—		398,797
Other financial assets
Derivatives financial assets for hedging		7,389		29,843
Financial assets at fair value through profit or loss		5,813		714,653
Financial assets at fair value through other comprehensive income		—		6,909
Financial assets at amortized costs		—		484,271
Available-for-sale financial assets		9,899		—
Held-to-maturity financial assets		151		—
Financial instruments and others		1,333,317		—
Financial guarantee contracts1		143,969		65,760
Total	￦	10,220,555	￦	10,508,462

1 It is total amount guaranteed by the Group according to the guarantee contracts.

(i) Trade receivables and contract assets

The Group applies the simplified approach to measuring expected credit losses which uses a lifetime expected loss allowance for all trade receivables and contract assets.

(ii) Cash equivalents (except for cash on hand)

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through profit or loss. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

(iii) Other financial assets at amortized costs

Other financial assets at amortized cost include time deposits, other long-term financial instruments and others. All of the financial assets at amortized costs are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Management consider ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term.

(iv) Financial assets at fair value through other comprehensive income

Financial assets at fair value through other comprehensive income include available-for-sale recognized in the prior financial year.

All of the debt investments at fair value through other comprehensive income are considered to have low credit risk, and the loss allowance recognized during the period was, therefore, limited to 12 months expected losses. Management consider ‘low credit risk’ for other instruments when they have a low risk of default and the issuer has a strong capacity to meet its contractual cash flow obligations in the near term.

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through other comprehensive income. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

(v) Financial assets at fair value through profit or loss

The Group is also exposed to credit risk in relation to financial assets that are measured at fair value through profit or loss. The maximum exposure at the end of the reporting period is the carrying amount of these investments.

3) Liquidity risk

The Group manages its liquidity risk by liquidity strategy and plans. The Group considers the maturity of financial assets and financial liabilities and the estimated cash flows from operations.

The table below analyzes the Group’s liabilities (including interest expenses) into relevant maturity groups based on the remaining period at the date of the end of each reporting period to the contractual maturity date. These amounts are contractual undiscounted cash flows and can differ from the amount in the financial statements.

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,882,861	￦	1,219,835	￦	161,497	￦	9,264,193
Borrowings(including debentures)		1,623,996		3,666,726		2,317,209		7,607,931
Other non-derivative financial liabilities		4,117		31,290		142,706		178,113
Financial guarantee contracts1		26,738		—		—		26,738
Total	￦	9,537,712	￦	4,917,851	￦	2,621,412	￦	17,076,975

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,287,436	￦	1,173,579	￦	492,429	￦	8,953,444
Borrowings(including debentures)		1,507,232		3,669,060		2,378,272		7,554,564
Other non-derivative financial liabilities		6,123		37,358		132,152		175,633
Financial guarantee contracts1		52,734		13,026		—		65,760
Total	￦	8,853,525	￦	4,893,023	￦	3,002,853	￦	16,749,401

1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed.

Cash outflow and inflow of derivatives settled gross or net are undiscounted contractual cash flow and can differ from the amount in the financial statements.

	December 31, 2016
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	1,174,147	￦	1,176,715	￦	536,005	￦	2,886,867
Inflow		1,302,112		1,306,199		588,559		3,196,870

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	638,171	￦	546,791	￦	526,633	￦	1,711,595
Inflow		608,270		568,976		509,558		1,686,804

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	455,343	￦	1,466,915	￦	517,301	￦	2,439,559
Inflow		484,505		1,492,718		519,133		2,496,356

(2) Management of Capital Risk

The Group’s objectives when managing capital are to safeguard the Group’s ability to continue as a going concern in order to provide returns for shareholders and benefits for other shareholders and to maintain an optimal capital structure to reduce the cost of capital.

The Group’s capital structure consists of liabilities including borrowings, cash and cash equivalents, and shareholders’ equity. The treasury department monitors the Group’s capital structure and considers cost of capital and risks related each capital component.

The debt-to-equity ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Total liabilities	￦	16,712,367		￦	17,815,630
Total equity		13,183,354			14,658,490
Debt-to-equity ratio		127	%		122	%

The Group manages capital on the basis of the gearing ratio. This ratio is calculated as net debt divided by total capital. Net debt is calculated as total borrowings less cash and cash equivalents. Total capital is calculated as ‘equity’ in the statement of financial position plus net debt.

The gearing ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won, %)	December 31, 2017			December 31, 2018
Total borrowings	￦	6,860,539		￦	6,648,293
Less: cash and cash equivalents		(1,928,182	)		(2,703,422	)
Net debt		4,932,357			3,944,871
Total equity		13,183,354			14,658,490
Total capital		18,115,711			18,603,361
Gearing ratio		27	%		21	%

(3) Offsetting Financial Assets and Financial Liabilities

Details of the Group’s recognized financial assets subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedge1	￦	3,284	￦	—		￦	3,284	￦	(3,284	)	￦	—	￦	—
Trade receivables2		85,755		(5,010	)		80,745		(73,109	)		—		7,636
Other financial assets		8,680		(436	)		8,244		(5,307	)		—		2,937
	￦	97,719	￦	(5,446	)	￦	92,273	￦	(81,700	)	￦	—	￦	10,573

(In millions of Korean won)	December 31, 2018
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables2	￦	78,833	￦	(1	)	￦	78,832	￦	(76,414	)	￦	—	￦	2,418
Other financial assets		19,825		—			19,825		(19,825	)		—		—
	￦	98,658	￦	(1	)	￦	98,657	￦	(96,239	)	￦	—	￦	2,418

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies

The Group’s recognized financial liabilities subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedging1	￦	26,135	￦	—		￦	26,135	￦	(3,284	)	￦	—	￦	22,851
Trade payables2		80,829		(5,217	)		75,612		(73,109	)		—		2,503
Other financial liabilities		5,549		(229	)		5,320		(5,307	)		—		13
	￦	112,513	￦	(5,446	)	￦	107,067	￦	(81,700	)	￦	—	￦	25,367

(In millions of Korean won)	December 31, 2018
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables2	￦	78,317	￦	—		￦	78,317	￦	(76,413	)	￦	—	￦	1,904
Other financial liabilities		19,827		(1	)		19,826		(19,825	)		—		1
	￦	98,144	￦	(1	)	￦	98,143	￦	(96,238	)	￦	—	￦	1,905

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies.

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Fair Value

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Fair Value

37. Fair Value

37.1 Fair Value of Financial Instruments by Category

Carrying amount and fair value of financial instruments by category as at December 31, 2017 and 2018, are as follows:

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	1,928,182		1	￦	2,703,422		1
Trade and other receivables
Financial assets measured at amortized cost		6,793,397		1		5,425,996		1
Financial assets at fair value through other comprehensive income		—		—		1,097,348		1,097,348
Other financial assets
Financial assets measured at amortized cost2		1,333,368		1		484,271		1
Financial assets at fair value through profit or loss2		5,913		5,913		777,685		777,685
Financial assets at fair value through other comprehensive income2		—		—		326,157		326,157
Available-for-sale financial assets3		319,402		319,402		—		—
Derivative financial assets for hedging		7,389		7,389		29,843		29,843
Total	￦	10,387,651			￦	10,844,722
Financial liabilities
Trade and other payables	￦	8,427,457		1	￦	8,521,379		1
Borrowings		6,683,662		6,738,326		6,648,293		1
Other financial liabilities
Financial liabilities at amortized cost		87,670		1		99,330		1

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial liabilities at fair value through profit or loss		5,051		5,051		7,758		7,758
Derivative financial liabilities for hedging		93,770		93,770		57,308		57,308
Total	￦	15,297,610			￦	15,334,068

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value.

2 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets and financial assets held-to-maturity.

3 As at December 31, 2017, equity instruments that do not have a quoted price in an active market are measured at cost because their fair value cannot be measured reliably and excluded from the fair value disclosures.

37.2 Fair Value Hierarchy

Assets measured at fair value or for which the fair value is disclosed are categorized within the fair value hierarchy, and the defined levels are as follows:

• Quoted prices (unadjusted) in active markets for identical assets or liabilities (Level 1).

• Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly (that is, prices) or indirectly (that is, derived from prices) (Level 2).

• Inputs for the asset or liability that are not based on observable market data (that is, unobservable inputs) (Level 3).

Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value or its fair value is disclosed as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Recurring fair value measurements
Other financial assets
Financial assets at fair value through profit or loss	￦	—	￦	—	￦	5,813	￦	5,813
Derivative financial assets for hedging		—		7,389		—		7,389
Available-for-sale financial assets		6,859		5,466		307,077		319,402
Disclosed fair value
Investment properties1		—		—		1,755,600		1,755,600
Total	￦	6,859	￦	12,855	￦	2,068,490	￦	2,088,204
Liabilities
Recurring fair value measurements
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	5,051	￦	5,051
Derivative financial liabilities for hedging		—		76,045		17,725		93,770
Total	￦	—	￦	76,045	￦	22,776	￦	98,821

1 The highest and best use of a non-financial asset does not differ from its current use.

	December 31, 2018
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,097,348	￦	—	￦	1,097,348
Other financial assets
Financial assets at fair value through profit or loss1		121		613,964		163,600		777,685
Financial assets at fair value through other comprehensive income1		8,861		5,760		311,536		326,157
Derivative financial assets for hedging		—		29,843		—		29,843
Disclosed fair value
Investment properties2		—		—		1,821,061		1,821,061
Total	￦	8,982	￦	1,746,915	￦	2,296,197	￦	4,052,094
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	7,758	￦	7,758
Derivative financial liabilities for hedging		—		47,125		10,183		57,308
Total	￦	—	￦	47,125	￦	17,941	￦	65,066

1 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

2 The highest and best use of a non-financial asset does not differ from its current use.

37.3 Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements

(a) Details of transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements are as follows:

There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements.

(b) Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Financial assets at fair value through profit or loss			Available-for-sale			Other derivative financial liabilities		Derivative financial liabilities for hedging
Beginning balance	￦	6,277		￦	287,889		￦	1,973	￦	—
Reclassification		—			(277	)		—		—
Amount recognized in other comprehensive income		—			58,450			—		(1,909	)
Purchases		—			85,287			—		—
Amount recognized in profit or loss		(464	)		(113	)		3,078		19,634
Sales		—			(124,159	)		—		—
Ending balance	￦	5,813		￦	307,077		￦	5,051	￦	17,725

	2018
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss3			Financial assets at fair value through other comprehensive income3			Financial liabilities at fair value through profit or loss2		Derivative financial liabilities for hedging1
Beginning balance	￦	97,547		￦	238,517		￦	5,051	￦	17,725
Changes in accounting policy		32,745			2,085			—		—
Purchases		21,365			8,802			—		—
Reclassification		1,581			(296	)		—		—
Changes in scope of consolidation		—			364			—		—
Sales		(1,852	)		(1,099	)		—		—
Amount recognized in profit or loss1,2		12,214			89			2,707		(17,255	)
Amount recognized in other comprehensive income1		—			63,074			—		9,713
Ending balance	￦	163,600		￦	311,536		￦	7,758	￦	10,183

1 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of both gain on valuation of derivatives and accumulated other comprehensive loss.

2 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of loss on valuation of derivatives.

3 In prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

37.4 Valuation Technique and the Inputs

Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Other financial assets
Derivative financial assets for hedging	￦	7,389		2	DCF Model
Available-for-sale financial assets		312,543		2,3	DCF Model
Financial assets at fair value through profit or loss		5,813		3	DCF Model
Investment properties		1,755,600		3	DCF Model
Liabilities
Other financial liabilities
Derivative financial liabilities for hedging	￦	93,770		2,3	Hull-White model, DCF Model
Other derivative financial liabilities		5,051		3	DCF Model, Comparable Company Analysis

	December 31, 2018
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,097,348		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		777,564		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		317,296		2,3	DCF Model
Derivative financial assets for hedging		29,843		2	DCF Model
Investment properties		1,821,061		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	7,758		3	DCF Model, Comparable Company Analysis
Derivative financial liabilities for hedging		57,308		2,3	Hull-White model, DCF Model

37.5 Valuation Processes for Fair Value Measurements Categorized Within Level 3

The Group uses external experts that perform the fair value measurements required for financial reporting purposes. External experts report directly to the chief financial officer (CFO), and discusses valuation processes and results with the CFO in line with the Group’s reporting dates.

37.6 Gains and losses on valuation at the transaction date

In the case that the Group values derivative financial instruments using inputs not based on observable market data, and the fair value calculated by the said valuation technique differs from the transaction price, then the fair value of the financial instruments is recognized as the transaction price. The difference between the fair value at initial recognition and the transaction price is deferred and amortized using a straight-line method by maturity of the financial instruments. However, in the case that inputs of the valuation techniques become observable in markets, the remaining deferred difference is immediately recognized in full in profit for the year.

In relation to this, details and changes of the total deferred difference for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017						2018
	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	—		￦	(8,470	)	￦	6,532		￦	(5,647	)
II. New transactions		7,126			—			—			—
III. Recognized at fair value through profit or loss		(594	)		2,823			(1,425	)		2,823
IV. Ending balance (I+II+III)	￦	6,532		￦	(5,647	)	￦	5,107		￦	(2,824	)

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Interests in Unconsolidated Structured Entities

12 Months Ended

Dec. 31, 2018

Investments accounted for using equity method [abstract]

Interests in Unconsolidated Structured Entities

38. Interests in Unconsolidated Structured Entities

Details of information about its interests in unconsolidated structured entities, which the Group does not have control over, including the nature, purpose and activities of the structured entity and how the structured entity is financed, are as follows:

Classes of entities

Nature, purpose, activities and others

Real estate finance

A structured entity incorporated for the purpose of real estate development is provided with funds by investors’ investments in equity and borrowings from financial institutions (including long-term and short-term loans and issuance of ABCP due in three months), and based on these, the structured entity implements activities such as real estate acquisition, development and mortgage loans. The structured entity repays loan principals with funds incurred from instalment house sales after the completion of real estate development or with collection of the principal of mortgage loan. The remaining shares are distributed to investors. As at December 31, 2018, this entity is engaged in real estate finance structured entity, and generates revenues by receiving dividends from direct investments in or receiving interests on loans to the structured entity. Financial institutions, including the Entity, are provided with guarantees including joint guarantees or real estate collateral from investors and others.

Classes of entities	Nature, purpose, activities and others
	Consequently, the entity is a priority over other parties in the preservation of claim. However, when the credit rating of investors and others decreases or when the value of real estate decreases, the entity may be obliged to cover losses.
PEF and investment funds	Minority investors including managing members contribute to PEF and investment funds incorporated for the purpose of providing funds to the small, medium, or venture entities, and the managing member implements activities such as investments in equity or loans based on the contributions. As at December 31, 2018, the entity is engaged in PEF and investment funds structured entity, and after contributing to PEF and investment funds, the entity receives dividends for operating revenues from these contributions. The entity is provided with underlying assets of PEF and investment funds as collateral. However, when the value of the underlying assets decreases, the entity may be obliged to cover losses.
Asset securitization	The Group transfers accounts receivable for handset sales to its Special Purpose Company (“SPC”) for asset securitization. SPC issues the asset-backed securities with accounts receivable for handset sales as an underlying asset, and makes payment for the underlying asset acquired.

Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,426,620	￦	3,779,377	￦	2,619,445	￦	7,825,442
Assets recognized in statement of financial position
Other financial assets	￦	21,800	￦	52,666	￦	—	￦	74,466
Joint ventures and associates		10,168		164,030		—		174,198
Total	￦	31,968	￦	216,696	￦	—	￦	248,664
Maximum loss exposure1
Investment assets	￦	31,968	￦	216,696	￦	—	￦	248,664
Total	￦	31,968	￦	216,696	￦	—	￦	248,664

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

(In millions of Korean won)	December 31, 2018
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,429,910	￦	3,701,718	￦	2,751,208	￦	7,882,836
Assets recognized in statement of financial position
Other financial assets	￦	24,421	￦	94,075	￦	—	￦	118,496
Joint ventures and associates		7,293		166,159		—		173,452
Total	￦	31,714	￦	260,234	￦	—	￦	291,948
Maximum loss exposure1
Investment assets	￦	31,714	￦	260,234	￦	—	￦	291,948
Total	￦	31,714	￦	260,234	￦	—	￦	291,948

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

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Information About Non-controlling Interests

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Information About Non-controlling Interests

39. Information About Non-controlling Interests

39.1 Changes in Accumulated Non-controlling Interests

Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2016, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2016
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	316,880	￦	22,445	￦	(8,279	)	￦	(1,370	)	￦	329,676
BC Card Co., Ltd.		30.46	%		322,921		47,068		(44,637	)		3,986			329,338
KT Powertel Co., Ltd.		55.15	%		50,926		112		—			713			51,751
KT Hitel Co., Ltd.		35.27	%		50,689		1,274		—			(165	)		51,798
KT Telecop Co., Ltd.		13.18	%		103,428		19		—			85			103,532

(In millions of Korean won)	December 31, 2017
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	329,676	￦	9,395	￦	(9,817	)	￦	(952	)	￦	328,302
BC Card Co., Ltd.		30.46	%		329,338		43,961		(29,490	)		(4,742	)		339,067
KT Powertel Co., Ltd.		55.15	%		51,751		1,165		—			137			53,053
KT Hitel Co., Ltd.		32.87	%		51,798		870		—			478			53,146
KT Telecop Co., Ltd.		13.18	%		103,532		381		—			(445	)		103,468

(In millions of Korean won)	December 31, 2018
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests			Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.46	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.15	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co., Ltd.		32.87	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.18	%		103,468		59			—			(170	)		103,357

39.2 Summarized Financial Information on Subsidiaries

The summarized financial information for each subsidiary with non-controlling interests that are material to the Group before inter-company eliminations is as follows:

Summarized consolidated statements of financial position as at December 31, 2016, 2017 and 2018, are as follows:

	December 31, 2016
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		35.27	%		13.18	%
Current assets	￦	352,980		￦	2,945,584		￦	69,046		￦	158,210		￦	63,802
Non-current assets		424,968			705,480			44,679			90,992			201,751
Current liabilities		151,329			2,530,832			17,910			45,277			53,903
Non-current liabilities		80,123			71,571			1,989			1,664			78,441
Equity		546,496			1,048,661			93,826			202,261			133,209
Operating revenue		668,945			3,567,512			81,390			198,994			315,948
Profit or loss for the year		68,863			163,131			202			4,298			143
Total comprehensive income		68,785			178,744			202			1,399			143
Cash flows from operating activities		155,399			92,818			7,271			28,987			60,461
Cash flows from investing activities		(210,480	)		(37,313	)		(8,191	)		(33,238	)		(45,243	)
Cash flows from financing activities before dividend paid to non-controlling interests		(16,647	)		(147,306	)		—			—			—
Dividend paid to non-controlling interests		(8,279	)		(44,637	)		—			—			—
Gain or loss foreign currency translation		—			(178	)		—			3			—
Net (decrease)/increase in cash and cash equivalents		(71,728	)		(91,801	)		(920	)		(4,251	)		15,218

	December 31, 2017
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	324,632		￦	3,225,262		￦	73,527		￦	150,368		￦	73,023
Non-current assets		468,261			823,001			41,598			107,872			191,330
Current liabilities		185,995			2,868,669			18,450			49,922			90,569
Non-current liabilities		24,555			86,369			487			3,021			41,064
Equity		582,343			1,093,225			96,188			205,297			132,720
Operating revenue		687,752			3,628,995			69,234			227,884			317,591
Profit or loss for the year		57,314			156,109			2,112			3,225			2,885
Total comprehensive income (loss)		55,586			141,719			2,362			3,036			(490	)
Cash flows from operating activities		99,269			108,203			13,895			28,320			57,262
Cash flows from investing activities		(81,758	)		(568,518	)		(17,354	)		(36,086	)		(43,483	)
Cash flows from financing activities before dividend paid to non-controlling interests		(19,739	)		(97,221	)		—			—			—
Dividend paid to non-controlling interests		(9,817	)		(29,490	)		—			—			—
Gain or loss foreign currency translation		—			(184	)		—			(47	)		—
Net (decrease)/increase in cash and cash equivalents		(2,228	)		(557,536	)		(3,459	)		(7,766	)		13,779

	December 31, 2018
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	301,739		￦	2,997,429		￦	84,785		￦	161,162		￦	52,367
Non-current assets		514,263			724,950			39,279			111,546			220,125
Current liabilities		112,411			2,520,050			27,187			63,231			85,648
Non-current liabilities		37,430			110,486			1,030			2,812			54,666
Equity		666,161			1,091,843			95,847			206,665			132,178
Operating revenue		694,059			3,551,715			65,620			279,117			328,262
Profit or loss for the year		52,010			70,889			(5,545	)		657			166
Total comprehensive income (loss)		47,787			116,604			(5,792	)		738			(1,517	)
Cash flows from operating activities		183,474			86,299			11,603			43,855			40,351
Cash flows from investing activities		(139,846	)		128,538			(2,580	)		(26,335	)		(76,969	)
Cash flows from financing activities		(77,647	)		(117,561	)		—			—			10,000
Net increase (decrease) in cash and cash equivalents		(34,019	)		97,276			9,023			17,520			(26,618	)
Cash and cash equivalents at beginning of year		65,747			177,826			6,626			21,647			32,326
Exchange differences		—			(13	)		—			19			—
Cash and cash equivalents at end of year		31,728			275,089			15,649			39,186			5,708

39.3 Transactions with Non-controlling Interests

The effect of changes in the ownership interest on the equity attributable to owners of the Group during 2016, 2017 and 2018 is summarized as follows:

(In millions of Korean won)	2016		2017			2018
Carrying amount of non-controlling interests acquired	￦	4,022	￦	(732	)	￦	(194	)
Consideration paid to non-controlling interests		7,347		6,173			11,312
Excess of consideration paid recognized in parent’s equity	￦	11,369	￦	5,441		￦	11,118

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Business Combination

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Business Combination

40. Business Combination

On May 31, 2018, the Group’s subsidiary, KT Telecop Co., Ltd. acquired the unmanned security business and SI (System Integration) business of SG Safety Corporation for ￦27,570 million. The acquisition is expected to increase the Group’s market share and competitiveness in the market. The Group additionally acquired treasury stock from MOS GB Co., Ltd. and MOS Chungcheong Co., Ltd., associates of the Group, for ￦11,048 million. The business combination is expected to enhance specialization and efficiency in installation of wireless network infrastructure and its maintenance. GENIE Music Corporation, a subsidiary of the Group, merged with CJ Digital Music Co., Ltd. (“acquired company”) by issuing 8,922,685 shares of subsidiaries to CJ ENM CO., Ltd., who owns 100% of shares of the acquired company, and acquiring all shares (1,600,000 shares) of the acquired company. The merger is expected to increase the Group’s market share in music service and distribution business, and also reduce costs through economies of scale.

Details of the business combination are as follows:

(In millions of Korean won)	Business line	Date	Purchase consideration
SG Safety Corporation	Unmanned security business	May 31, 2018	￦	27,544
KT MOS Bukbu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		8,160
KT MOS Nambu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		6,310
CJ Digital Music Co., Ltd.	Music distribution	October 10, 2018		50,948

Fair value of the purchase consideration from the business combination is as follows:

(In millions of Korean won)	SG Safety Corporation			KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Cash and cash equivalents	￦	28,000		￦	6,283	￦	4,765	￦	—
Settled receivables1		(456	)		—		—		—
Fair value of equity instruments previously held2		—			1,877		1,545		—
Fair value of equity instruments newly issued3		—			—		—		50,948
Total	￦	27,544		￦	8,160	￦	6,310	￦	50,948

1 Uncollected amount which incurred after the payment of consideration from adjustment of purchase consideration caused by additional retirement benefit.

2 The shares previously held by KT MOS Bukbu Co., Ltd. (93,994 ordinary shares) and KT MOS Nambu Co., Ltd. (65,831 ordinary shares), non-listed entities, were evaluated by using the profit approach.

3 The fair value (￦50,948 million) of 8,992,685 ordinary shares of GENIE Music Corporation, the consideration transferred, was based on the share price disclosed at the merger date. The issuance cost amounting to ￦31 million were deducted from deemed issuance price.

Fair value of the assets and liabilities recognized as a result of the acquisition at the acquisition date are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Recognized amounts of identifiable assets acquired	￦	17,763	￦	14,924	￦	12,242	￦	28,117
Cash and cash equivalents		—		7,864		3,340		1,556
Trade and other receivables		—		4,827		6,318		11,200
Other current assets		1,367		160		85		484
Inventories		—		—		—		5
Current income tax assets		—		—		75		—
Property and equipment		4,047		855		1,104		791
Intangible assets				997		478		1,860
Distribution agency contract (included in intangibles)		—		—		—		11,753
Contractual customer relationship (included in intangibles)		10,467		—		—		468
Deferred income tax assets		—		113		576		—
Other non-current assets		1,882		10		—		—
Other non-current financial assets		—		98		266		—
Recognized amounts of identifiable liabilities assumed		5,637		10,050		6,433		25,559
Trade and other payables		120		6,767		3,327		18,947
Borrowings		5,000		—		—		—
Other current liabilities		—		363		703		3,481
Current income tax liabilities		—		103		—
Post-employment benefit obligations		517		2,768		2,360		311
Deferred income tax liabilities		—		—		—		2,497
Other non-current liabilities		—		49		43		323
Total	￦	12,126	￦	4,874	￦	5,809	￦	2,558

As at December 31, 2018, details of the recognized goodwill as a result of the business combination are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration	￦	27,544	￦	8,160	￦	6,310	￦	50,948
Add: Non-controlling interests1		—		—		101		—
Less:
Fair value of identifiable net assets		12,126		4,874		5,809		2,558
Goodwill2	￦	15,418	￦	3,286	￦	602	￦	48,390

1 Non-controlling interests for KT MOS Nambu Co., Ltd. acquired during the year ended December 31, 2018 are measured at proportionate shares of acquiree’s identifiable net assets.

2 The goodwill from the business combination is attributable to economies of scale expected and the acquired customer relationships.

Details of cash outflows as a result of acquisition are as follows:

(In millions of Korean won)	SG Safety Corporation1		KT MOS Bukbu Co., Ltd			KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration
Cash1	￦	28,000	￦	6,283		￦	4,765	￦	—
Less:
Recognized amounts of cash and cash equivalents		—		7,864			3,340		1,556
Total	￦	28,000	￦	(1,581	)	￦	1,425	￦	(1,556	)

1 The difference from purchase considerations of ￦27,544 million is attributable to uncollected settled receivables.

Since the unmanned security business acquired from SG Safety Corporation is incorporated into the Group’s main business segment, the security services business, it is difficult to identify revenue and net profit generated from business combination during the reporting period.

Since KT MOS Bukbu Co., Ltd. and KT MOS Nambu Co., Ltd. are incorporated into the network business, it is difficult to identify revenue and net profit generated from business combination during the reporting period.

According to the contract, KT Telecop Co., Ltd. has the right to be reimbursed from SG Safety Corporation in the amount equivalent to 35 times the difference between the target revenue and monthly security business revenue as at December 31, 2023. However, as at the end of the reporting period, related reimbursement asset is not recognized since it is reasonably expected that the revenue will meet its target.

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Changes in Accounting Policies

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Changes in Accounting Policies

41. Changes in Accounting Policies

(1) Adoption of IFRS 15 Revenue from Contracts with Customers

As explained in Note 2, the Group has applied IFRS 15 Revenue from Contracts with Customers from January 1, 2018. In accordance with the transitional provisions in IFRS 15, comparative figures have not been restated. Financial statement line items affected by the adoption of the new rules in the current period are as follows:

The impact on the financial statements due to the application of IFRS 15 at the date of initial application (January 1, 2018) is as follows:

	January 1, 2018
(In millions of Korean won)	Before application of IFRS 15 (*)		Adjustment			After application of IFRS 15
Current assets	￦	9,828,525	￦	1,288,908		￦	11,117,433
Trade and other receivables		5,964,565		4,475			5,969,040
Inventories		642,027		—			642,027
Other current assets1,2		304,860		1,284,433			1,589,293
Others		2,917,073		—			2,917,073
Non-current assets		20,067,196		68,060			20,135,256
Trade and other receivables		828,832		(2,285	)		826,547
Deferred income tax assets		712,222		(352,273	)		359,949
Other non-current assets1,2		107,165		422,618			529,783
Others		18,418,977		—			18,418,977
Total assets	￦	29,895,721	￦	1,356,968		￦	31,252,689
Current liabilities	￦	9,474,162	￦	269,893		￦	9,744,055
Trade and other payables		7,426,088		297			7,426,385
Deferred revenue		17,906		33,655			51,561
Provisions		78,172		177			78,349
Other current liabilities1		258,315		235,764			494,079
Others		1,693,681		—			1,693,681
Non-current liabilities		7,238,205		80,236			7,318,441
Deferred revenue		91,698		23,831			115,529
Deferred income tax liabilities		128,462		6,905			135,367
Other non-current liabilities1		237,283		49,500			286,783
Others		6,780,762		—			6,780,762
Total liabilities	￦	16,712,367	￦	350,129		￦	17,062,496
Equity attribute to owners of the Controlling Company	￦	11,791,590	￦	929,866		￦	12,721,456
Non-controlling interest		1,391,764		76,973			1,468,737
Total equity	￦	13,183,354	￦	1,006,839		￦	14,190,193

(*) The amounts in this column are before the adjustments from the adoption of IFRS 9.

The effect of adoption of IFRS 15 on the consolidated financial statements for the year ended December 31, 2018, is as follows.

- Consolidated statement of financial position

	December 31, 2018
(In millions of Korean won)	Reported Amount (*)		Adjustments			Amount before application of IFRS 15
Current assets	￦	12,157,814	￦	(1,335,128	)	￦	10,822,686
Trade and other receivables		5,680,349		7,141			5,687,490
Inventories		1,074,634		53,035			1,127,669
Other current assets1,2		1,687,548		(1,395,304	)		292,244
Others		3,715,283		—			3,715,283
Non-current assets		20,316,306		(87,432	)		20,228,874
Trade and other receivables		842,995		4,617			847,612
Deferred income tax assets		465,369		356,928			822,297
Other non-current assets1,2		545,895		(448,977	)		96,918
Others		18,462,047		—			18,462,047
Total assets	￦	32,474,120	￦	(1,422,560	)	￦	31,051,560
Current liabilities	￦	9,394,123	￦	(318,260	)	￦	9,075,863
Deferred revenue		52,878		(38,057	)		14,821
Provisions		117,881		(565	)		117,316
Other current liabilities1		596,589		(279,638	)		316,951
Others		8,626,775		—			8,626,775
Non-current liabilities		8,421,507		(54,508	)		8,366,999
Deferred revenue		110,702		(27,233	)		83,469
Deferred income tax liabilities		204,785		(21,019	)		183,766
Other non-current liabilities1		423,626		(6,256	)		417,370
Others		7,682,394		—			7,682,394
Total liabilities	￦	17,815,630	￦	(372,768	)	￦	17,442,862
Equity attribute to owners of the Controlling Company	￦	13,129,901	￦	(970,430	)	￦	12,159,471
Non-controlling interest		1,528,589		(79,362	)		1,449,227
Total equity	￦	14,658,490	￦	(1,049,792	)	￦	13,608,698

(*) Amounts include adjustments arising from adoption of IFRS 9.

¹  Allocation the transaction price

With the implementation of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer. To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct goods or services underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The stand-alone selling price is the price at which the Group would sell promised goods or services separately to the customer. The best evidence of a stand-alone selling price is the observable price of a goods or services when the Group sells that goods or services separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

In relation to this, as at December 31, 2018, contract assets and contract liabilities are increased by ￦398,797 million (January 1, 2018: ￦421,131 million) and ￦347,461 million (January 1, 2018: ￦282,836 million), respectively.

²  Incremental costs of obtaining a contract

The Group pays the commission fees when new customer subscribe for telecommunication services. The incremental costs of obtaining a contract are those commission fees that the Group incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained.

According to IFRS 15, the Group recognizes as an asset the incremental cost of obtaining contract and amortize it through the contract period. However, as a practical expedient, the Group recognizes the incremental costs of obtaining a contracts as an expense when incurred if the amortization period of the asset is one year or less.

In relation to this, prepaid expenses are increased by ￦1,444,822 million as at December 31, 2018 (January 1, 2018: ￦1,285,443 million).

- Consolidated statement of profit or loss

	2018
(In millions of Korean won)	Reported Amount (*)			Adjustments			Amount before application of IFRS 15
Operating revenue	￦	23,436,050		￦	268,270		￦	23,704,320
Operating expenses		22,335,190			316,495			22,651,685
Operating profit		1,100,860			(48,225	)		1,052,635
Financial income		374,243			(3,862	)		370,381
Financial costs		435,659			16,860			452,519
Share of net losses of associates and joint venture		(5,467	)		—			(5,467	)
Profit before income tax		1,033,977			(68,947	)		965,030
Income tax expense		314,565			(17,944	)		296,621
Profit for the year	￦	719,412		￦	(51,003	)	￦	668,409

(*) Amounts include adjustments arising from adoption of IFRS 9.

- Consolidated statement of cash flows

The application of IFRS 15 has no material impact on cash flows from operating, investing and financing activities on the statements of cash flows.

(2) Adoption of IFRS 9 Financial Instruments

The Group has applied IFRS 9 Financial Instruments from January 1, 2018. In accordance with the transitional provisions in IFRS 9, comparative figures have not been adjusted.

IFRS 9 replaces IAS 39, Financial Instruments: Recognition and Measurement, relating to the recognition of financial assets and financial liabilities, classification, measurement and elimination of financial instruments, impairment of financial assets and hedge accounting. IFRS 9 also significantly amends other standards dealing with financial instruments such as IFRS 7 Financial Instruments: Disclosures.

(a) Beginning balance of retained earnings after adjustment

Details of the Group’s beginning balance of retained earnings after adjustment due to application of IFRS 9, are as follows:

(In millions of Korean won)	January 1, 2018
Beginning balance — IAS 39	￦	9,961,150
Reclassification of available-for-sale securities to financial assets at fair value through profit or loss		32,754
Reclassification of available-for-sale securities to financial assets at fair value through other comprehensive income		2,191
Increase in provision for impairment of financial assets at amortized cost		(1,817	)
Increase in provision with unused limit		(287	)
Decrease in deferred income tax assets		(8,395	)
Adjustments of non-controlled interests		(259	)
Adjustments to retained earnings from adoption of IFRS 9		24,187
Beginning balance of retained earnings — IFRS 9		9,985,337
Adjustment to retained earnings from adoption of IFRS 15		929,866
Beginning balance of retained earnings after adjustment	￦	10,915,203

(b) Classification and Measurement of Financial Instruments

On the date of initial application of IFRS 9, January 1, 2018, the Group’s management has assessed which business models apply to the financial assets held by the Group and has classified its financial instruments into the appropriate IFRS 9 categories. The main effects resulting from this reclassification are as follows:

(In millions of Korean won)	Classification in accordance with		Amount in accordance with
Account	IAS 39	IFRS 9	IAS 39		IFRS 9		Differences
Financial assets
Cash and cash equivalent	Loans and receivables	Financial assets measured at amortized cost	￦	1,928,182	￦	1,928,182	￦	—
Trade and other receivables	Loans and receivables	Financial assets measured at amortized cost		6,793,397		5,836,089		(1,028	)
		Financial assets at fair value through other comprehensive income				980,766		24,486
Other financial assets	Loans and receivables	Financial assets measured at amortized cost		1,333,317		462,075		(789)
		Financial assets at fair value through profit or loss				870,453		—
	Financial assets at fair value through profit or loss	Financial assets at fair value through profit or loss		5,813		5,813		—
	Derivative financial assets for hedging purpose	Derivative financial assets for hedging purpose		7,389		7,389		—
	Financial assets available-for-sale	Financial assets measured at amortized cost				28,603		—
		Financial assets at fair value through profit or loss		380,953		127,276		32,745
		Financial assets at fair value through other comprehensive income				259,904		2,085
	Financial assets held-to-maturity	Financial assets measured at amortized cost				51		—
		Financial assets at fair value through profit or loss		151		100		—
		Financial assets at fair value through other comprehensive income				—		—
Financial liabilities
Trade payables and payables	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		￦8,427,457		￦8,427,457		￦—
Borrowing	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		6,683,662		6,683,662		—
Other financial liabilities	Financial liabilities at fair value through profit or loss	Financial liabilities at fair value through profit or loss		5,051		5,051		—
Other financial liabilities	Derivative financial liabilities for hedging purpose	Derivative financial liabilities for hedging purpose		93,770		93,770		—
Other financial liabilities (*)	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		89,104		89,391		287

(*) The amount includes provisions of which loss allowance is remeasured due to adoption of IFRS 9.

The impact on these changes on the Group’s equity as at January 1, 2018, is as follows:

(In millions of Korean won)	Accumulated other comprehensive income			Retained earnings
Reclassification from loans and receivables to financial assets at fair value through other comprehensive income, and fair value assessment	￦	24,486		￦	—
Reclassification from available-for-sale financial assets to financial assets at fair value through profit or loss, and fair value assessment		(9	)		32,754
Reclassification from available-for-sale financial assets to financial assets at fair value through other comprehensive income		(106	)		2,191
Increase in provision for impairment of financial assets at amortized cost		—			(1,817	)
Increase in provision with unused limit		—			(287	)
Income tax effect		(6,734	)		(8,395	)
Adjustments of non-controlled interests		104			(259	)
Total adjustments from application of IFRS 9	￦	17,741		￦	24,187

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Events after Reporting Period

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Events after Reporting Period

42. Events after Reporting Period

Subsequent to the reporting period, public bonds issued are as follow:

	December 31, 2018
(In millions of Korean won)	Issue date		Carrying amount		Interest rate			Redemption date
The 191-1st Public bond		2019.01.15	￦	220,000		2.048	%		2022.01.14
The 191-2nd Public bond		2019.01.15		80,000		2.088	%		2024.01.15
The 191-3rd Public bond		2019.01.15		110,000		2.160	%		2029.01.15
The 191-4th Public bond		2019.01.15		90,000		2.213	%		2039.01.14

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Revision of prior financial statements

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Revision of prior financial statements

43. Revision of prior financial statements

The Group revised the prior period financial statements to correct errors in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system, and the details are as follows:

Consolidated Statements of financial position

(In millions of Korean won)	January 1, 2017						December 31, 2017
	As Previously Reported		Adjustments		As Revised		As Previously Reported		Adjustments		As Revised
Current assets	￦	9,716,020	￦	150,282	￦	9,866,302	￦	9,678,243	￦	150,282	￦	9,828,525
Trade and other receivables		5,327,352		150,282		5,477,634		5,814,283		150,282		5,964,565
Total assets	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721
Current liabilities	￦	9,523,137	￦	16,058	￦	9,539,195	￦	9,458,104	￦	16,058	￦	9,474,162
Trade and other payables		7,139,771		1,954		7,141,725		7,424,134		1,954		7,426,088
Current income tax liabilities		88,739		14,104		102,843		68,880		14,104		82,984
Total liabilities	￦	17,881,580	￦	16,058	￦	17,897,638	￦	16,696,309	￦	16,058	￦	16,712,367
Equity attribute to owners of the Controlling Company	￦	11,429,874	￦	134,224	￦	11,564,098	￦	11,657,366	￦	134,224	￦	11,791,590
Retained earnings		9,644,483		134,224		9,778,707		9,826,926		134,224		9,961,150
Total equity		12,782,718		134,224		12,916,942		13,049,130		134,224		13,183,354
Total liabilities and equity	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721

Consolidated Statement of operations & Comprehensive Income

(In millions of Korean won)	Year ended December 31, 2016
	As Previously Reported		Adjustments		As Revised
Operating revenue	￦	23,120,878	￦	43,324	￦	23,164,202
Operating profit		1,339,780		43,324		1,383,104
Profit before income tax		1,123,431		43,324		1,166,755
Income tax expense		328,314		6,596		334,910
Profit for the year	￦	795,117	￦	36,728	￦	831,845
Profit for the year attributable to the equity holders of the Controlling Company		708,362		36,728		745,090
Total comprehensive income for the year	￦	789,447	￦	36,728	￦	826,175
Total comprehensive income for the year attributable to the equity holders of the Controlling Company	￦	701,685	￦	36,728	￦	738,413

Consolidated Statements of changes in equity

(In millions of Korean won)

As Previously Reported

Adjustments

As Revised

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Balance at January 1, 2016

￦

9,049,971

￦

10,835,735

￦

97,496

￦

97,496

￦

9,147,467

￦

10,933,231

Balance at December 31, 2016

￦

9,644,483

￦

11,429,874

￦

134,224

￦

134,224

￦

9,778,707

￦

11,564,098

Balance at December 31, 2017

￦

9,826,926

￦

11,657,366

￦

134,224

￦

134,224

￦

9,961,150

￦

11,791,590

The increase in retained earnings due to revision of prior period financial statements before January 1, 2016 is ￦97,496 million.

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Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Basis of Preparation

2.1 Basis of Preparation

The consolidated financial statements of the Group have been prepared in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”).

The preparation of the consolidated financial statements requires the use of certain critical accounting estimates. It also requires management to exercise judgment in the process of applying the Group’s accounting policies. The areas involving a higher degree of judgment or complexity, or areas where assumptions and estimates are significant to the consolidated financial statements are disclosed in Note 3.

Correction (“revision”) of prior financial statements

During the year 2018, the Group identified errors related to prior years in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system. Pursuant to the guidance of Staff Accounting Bulletin (“SAB”) No. 99, “Materiality”, the Group evaluated the materiality of the misstatement quantitatively and qualitatively and has concluded that the amounts of misstatement were not material to its annual prior periods financial statements or trends of financial results. However, because of the significance of the cumulative out-of-period adjustment to the 2018 fiscal year, the financial statements for years prior to 2018 fiscal year have been revised in accordance with SAB No. 108, “Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements”. See Note 43 for further details on the impact of the revision.

Changes in Accounting Policy and Disclosures

2.2 Changes in Accounting Policy and Disclosures

(1) New and amended standards adopted by the Group

The Group has applied the following standards and amendments for the first time for their annual reporting period commencing January 1, 2018, and the application has following impacts on the consolidated financial statements.

- Amendments to IAS 28 Investments in Associates and Joint Ventures

When an investment in an associate or a joint venture is held by, or is held indirectly through, an entity that is a venture capital organization, or a mutual fund, unit trust and similar entities including investment-linked insurance funds, the entity may elect to measure each investment separately at fair value through profit or loss in accordance with IFRS 9. The amendment does not have a significant impact on the financial statements because the Group is not a venture capital organization.

- Amendments to IAS 40 Transfers of Investment Property

The amendment to IAS 40 clarifies that a transfer to, or from, investment property, including property under construction, can only be made if there has been a change in use that is supported by evidence, and the list of evidence for a change of use in the standard was re-characterized as a non-exclusive list of example. The amendment does not have a significant impact on the financial statements.

- Amendments to IFRS 2 Share-based Payment

Amendments to IFRS 2 clarify accounting for a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. Amendments also clarify that the measurement approach should treat the terms and conditions of a cash-settled award in the same way as for an equity-settled award. The amendment does not have a significant impact on the financial statements.

- Enactment of IFRIC 22 Foreign Currency Transaction and Advance Consideration

According to the enactment, the date of the transaction for the purpose of determining the exchange rate to use on initial recognition of the related asset, expense or income (or part of it) is the date on which an entity initially recognizes the non-monetary asset or non-monetary liability arising from the payment or receipt of advance consideration. The enactment does not have a significant impact on the financial statements.

- IFRS 9 Financial Instruments

The Group has applied IFRS 9 Financial Instruments on January 1, 2018, the date of initial application. In accordance with the transitional provisions in IFRS 9, comparative figures have not been restated, and the differences between previous book amounts and book amounts at the date of initial application are recognized to retained earnings. See Note 41 for further details on the impact of the application of the standard.

- IFRS 15 Revenue from Contracts with Customers

The Group has applied IFRS 15 Revenue from Contracts with Customers. In accordance with the transition provisions in IFRS 15, comparative figures have not been restated. The Group elected the modified retrospective approach, and recognized the cumulative impact of initially applying the revenue standard as an adjustment to retained earnings as at January 1, 2018, the period of initial application. See Note 41 for further details on the impact of the application of the standard.

(2) New standards and interpretations not yet adopted by the Group

Certain new accounting standards and interpretations that have been published that are not mandatory for annual reporting period commencing January 1, 2018 and have not been early adopted by the Group are set out below.

- Amendments to IFRS 16 Leases

IFRS 16 Leases issued on May 22, 2017 is effective for annual periods beginning on or after January 1, 2019, with early adoption permitted. This standard will replace IAS 17 Leases. The Group will apply the standards for annual periods beginning on or after January 1, 2019.

Under the new standard, with implementation of a single lease model, lessee is required to recognize assets and liabilities for all lease which lease term is over 12 months and underlying assets are not low value assets. A lessee is required to recognize a right-of-use asset and a lease liability representing its obligation to make lease payments.

The Group performed an impact assessment to identify potential financial effects of applying IFRS 16. The Group is analyzing the effects on the financial statements based on available information as at December 31, 2018 to identify effects on 2019 financial statements.

The Group will adopt IFRS 16 Leases effective January 1, 2019 using a modified retrospective method and will not restate comparative periods. The Group will carry forward the assessment of whether our contracts contain or are leases, classification of our leases and remaining lease terms. Based on the Group’s portfolio of leases as at December 31, 2018, approximately KRW 616,759 million of lease assets and liabilities will be recognized on the consolidated statement of financial position upon adoption. In the statement of cash flows, the repayment portion of the lease payments from existing operating leases will reduce net cash from/used in financing activities and no longer affect net cash from operating activities. Only the interest payments will remain in net cash from operating activities, the total of which will rise.

- Amendments to IFRS 9 Financial Instruments

The narrow-scope amendments made to IFRS 9 Financial Instruments enable entities to measure certain prepayable financial assets with negative compensation at amortized cost. When a modification of a financial liability measured at amortized cost that does not result in the derecognition, a modification gain or loss shall be recognized in profit or loss. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted.

- Amendments to IAS 19 Employee Benefits

The amendments require that an entity shall calculate current service cost and net interest for the remainder of the reporting period after a plan amendment, curtailment or settlement based on updated actuarial assumptions from the date of the change. The amendments also require that a reduction in a surplus must be recognized in profit or loss even if that surplus was not previously recognized because of the impact of the asset ceiling. The amendments are effective for plan amendments, curtailments and settlements occurring in reporting periods that begin on or after January 1, 2019.

- Amendments to IAS 28 Investments in Associates and Joint Ventures

The amendments clarify that an entity shall apply IFRS 9 to financial instruments in an associate or joint venture to which the equity method is not applied. These include long-term interests that, in substance, form part of the entity’s net investment in an associate or joint venture. These amendments will be applied for annual periods beginning on or after January 1, 2019, with early adoption permitted. In accordance with the transitional provisions in IFRS 9, the restatement of the comparative information is not required and the cumulative effects of initially applying the amendments retrospectively should be recognized in the beginning balance of retained earnings (or other components of equity, as appropriate) at the date of initial application.

- Enactment to IFRIC 23 Uncertainty over Income Tax Treatments

The Interpretation explains how to recognize and measure deferred and current income tax assets and liabilities where there is uncertainty over a tax treatment, and includes guidance on how to determine whether each uncertain tax treatment is considered separately or together. It also presents examples of circumstances where a judgement or estimate is required to be reassessed. This Interpretation will be applied for annual periods beginning on or after January 1, 2019, and an entity can either restate the comparative financial statements retrospectively or recognize the cumulative effect of initially applying the Interpretation as an adjustment in the beginning balance at the date of initial application.

- Annual Improvements to IFRS 2015 – 2017 Cycle:

• IFRS 3 Business Combination

The amendments clarify that when a party to a joint arrangement obtains control of a business that is a joint operation, and had rights to the assets and obligations for the liabilities relating to that joint operation immediately before the acquisition date, the transaction is a business combination achieved in stages. In such cases, the acquirer shall remeasure its entire previously held interest in the joint operation. These amendments will be applied to business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• IFRS 11 Joint Agreements

The amendments clarify that when a party that participates in, but does not have joint control of, a joint operation might obtain joint control of the joint operation in which the activity of the joint operation constitutes a business. In such cases, previously held interests in the joint operation are not remeasured. These amendments will be applied to transactions in which an entity obtains joint control on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

• Paragraph 57A of IAS 12 Income Tax

The amendment is applied to all the income tax consequences of dividends and requires an entity to recognize the income tax consequences of dividends in profit or loss, other comprehensive income or equity according to where the entity originally recognized those past transactions or events. These amendments will be applied for annual reporting periods beginning on or after January 1, 2019, with early adoption permitted.

• IAS 23 Borrowing Costs

The amendments clarify that if a specific borrowing remains outstanding after the related qualifying asset is ready for its intended use (or sale), it becomes part of general borrowings. These amendments will be applied to borrowing costs incurred on or after the beginning of the first annual reporting period beginning on or after January 1, 2019, with early adoption permitted.

Consolidation

2.3 Consolidation

The Group has prepared the consolidated financial statements in accordance with IFRS 10 Consolidated Financial Statements.

(1) Subsidiaries

Subsidiaries are all entities (including special purpose entities (“SPEs”)) over which the Group has control. The Group controls an entity when the Group is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power to direct the activities of the entity. Subsidiaries are fully consolidated from the date on which control is transferred to the Group. They are deconsolidated from the date that control ceases.

The acquisition method of accounting is used to account for business combinations by the Group. The consideration transferred is measured at the fair values of the assets transferred, and identifiable assets acquired and liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. The Group recognizes any non-controlling interest in the acquired entity on an acquisition-by-acquisition basis either at fair value or at the non-controlling interest’s proportionate share of the acquired entity’s net identifiable assets. All other non-controlling interests are measured at fair values, unless otherwise required by other standards. Acquisition-related costs are expensed as incurred.

The excess of consideration transferred, amount of any non-controlling interest in the acquired entity and acquisition-date fair value of any previous equity interest in the acquired entity over the fair value of the net identifiable assets acquired is recoded as goodwill. If those amounts are less than the fair value of the net identifiable assets of the business acquired, the difference is recognized directly in the profit or loss as a bargain purchase.

Intercompany transactions, balances and unrealized gains on transactions between group companies are eliminated. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment of the transferred asset. Accounting policies of subsidiaries have been changed where necessary to ensure consistency with the policies adopted by the Group.

(2) Changes in ownership interests in subsidiaries without change of control

Any difference between the amount of the adjustment to non-controlling interest that do not result in a loss of control and any consideration paid or received is recognized in a separate reserve within equity attributable to owners of the Controlling Group.

(3) Disposal of subsidiaries

When the Group ceases to consolidate for a subsidiary because of a loss of control, any retained interest in the subsidiary is remeasured to its fair value with the change in carrying amount recognized in profit or loss.

(4) Associates

Associates are all entities over which the Group has significant influence, and investments in associates are initially recognized at acquisition cost using the equity method. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If there is any objective evidence that the investment in the associate is impaired, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss.

(5) Joint arrangement

A joint arrangement, wherein two or more parties have joint control, is classified as either a joint operation or a joint venture. A joint operator recognizes its direct right to the assets, liabilities, revenues and expenses of joint operations and its share of any jointly held or incurred assets, liabilities, revenues and expenses. A joint venture has rights to the net assets relating to the joint venture and accounts for that investment using the equity method.

Segment Reporting

2.4 Segment Reporting

Information of each operating segment is reported in a manner consistent with the business segment reporting provided to the chief operating decision-maker (Note 34). The chief operating decision-maker is responsible for allocating resources and assessing performance of the operating segments.

Foreign Currency Translation

2.5 Foreign Currency Translation

(1) Functional and presentation currency

Items included in the financial statements of each of the Group’s entities are measured using the currency of the primary economic environment in which each entity operates (the “functional currency”). The consolidated financial statements are presented in Korean won, which is the Parent Company’s functional and presentation currency.

(2) Transactions and balances

Foreign currency transactions are translated into the functional currency using the exchange rates at the dates of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation of monetary assets and liabilities denominated in foreign currencies at year end exchange rates are generally recognized in profit or loss. They are deferred in other comprehensive income if they relate to qualifying cash flow hedges and qualifying effective portion of net investment hedges, or are attributable to monetary part of the net investment in a foreign operation.

Foreign exchange gains and losses are presented in the statement of profit or loss, within finance costs.

Non-monetary items that are measured at fair value in a foreign currency are translated using the exchange rates at the date when the fair value was determined. Translation differences on assets and liabilities carried at fair value are reported as part of the fair value gain or loss. For example, translation differences on non-monetary assets and liabilities such as equities held at fair value through profit or loss are recognized in profit or loss as part of the fair value gain or loss and translation differences on non-monetary assets such as equities classified as equity instruments at fair value through other comprehensive income are recognized in other comprehensive income.

(3) Translation to the presentation currency

The results and financial position of foreign operations that have a functional currency different from the presentation currency are translated into the presentation currency as follows:

• assets and liabilities for each statement of financial position presented are translated at the closing rate at the end of the reporting period,

• income and expenses for each statement of profit or loss are translated at average exchange rates for the period,

• equity is translated at the historical exchange rate, and

• all resulting exchange differences are recognized in other comprehensive income.

Cash and Cash Equivalents

2.6 Cash and Cash Equivalents

Cash and cash equivalents include cash on hand, deposits held at call with banks, and other short-term highly liquid investments with original maturities of less than three months.

Financial Assets

2.7 Financial Assets

(1) Classification

From January 1, 2018, the Group classifies its financial assets in the following measurement categories:

• those to be measured at fair value through profit or loss

• those to be measured at fair value through other comprehensive income, and

• those to be measured at amortized cost.

The classification depends on the Group’s business model for managing the financial assets and the contractual terms of the cash flows.

For financial assets measured at fair value, gains and losses will either be recorded in profit or loss or other comprehensive income. For investments in debt instruments, this will depend on the business model in which the investment is held. The Group reclassifies debt investments when, and only when its business model for managing those assets changes.

For investments in equity instruments that are not held for trading, this will depend on whether the Group has made an irrevocable election at the time of initial recognition to account for the equity investment at fair value through other comprehensive income. Changes in fair value of the investments in equity instruments that are not accounted for as other comprehensive income are recognized in profit or loss.

(2) Measurement

At initial recognition, the Group measures a financial asset at its fair value plus, in the case of a financial asset not at fair value through profit or loss, transaction costs that are directly attributable to the acquisition of the financial asset. Transaction costs of financial assets carried at fair value through profit or loss are expensed in profit or loss.

Hybrid (combined) contracts with embedded derivatives are considered in their entirety when determining whether their cash flows are solely payment of principal and interest.

A. Debt instruments

Subsequent measurement of debt instruments depends on the Group’s business model for managing the asset and the cash flow characteristics of the asset. The Group classifies its debt instruments into one of the following three measurement categories:

• Amortized cost: Assets that are held for collection of contractual cash flows where those cash flows represent solely payments of principal and interest are measured at amortized cost. A gain or loss on a debt investment that is subsequently measured at amortized cost and is not part of a hedging relationship is recognized in profit or loss when the asset is derecognized or impaired. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method.

• Fair value through other comprehensive income: Assets that are held for collection of contractual cash flows and for selling the financial assets, where the assets’ cash flows represent solely payments of principal and interest, are measured at fair value through other comprehensive income. Movements in the carrying amount are taken through other comprehensive income, except for the recognition of impairment loss (and reversal of impairment loss), interest income and foreign exchange gains and losses which are recognized in profit or loss. When the financial asset is derecognized, the cumulative gain or loss previously recognized in other comprehensive income is reclassified from equity to profit or loss. Interest income from these financial assets is included in ‘finance income’ using the effective interest rate method. Foreign exchange gains and losses are presented in ‘finance income or finance costs’ and impairment loss in ‘finance costs or operating expenses’.

• Fair value through profit or loss: Assets that do not meet the criteria for amortized cost or fair value through other comprehensive income are measured at fair value through profit or loss. A gain or loss on a debt investment that is subsequently measured at fair value through profit or loss and is not part of a hedging relationship is recognized in profit or loss and presented net in the statement of profit or loss within ‘finance income or finance costs’ in the period in which it arises.

B. Equity instruments

The Group subsequently measures all equity investments at fair value. Where the Group’s management has elected to present fair value gains and losses on equity investments in other comprehensive income, there is no subsequent reclassification of fair value gains and losses to profit or loss following the derecognition of the investment. Dividends from such investments continue to be recognized in profit or loss as ‘finance income’ when the Group’s right to receive payments is established.

Changes in the fair value of financial assets at fair value through profit or loss are recognized in ‘finance income or finance costs’ in the statement of profit or loss as applicable. Impairment loss (and reversal of impairment loss) on equity investments measured at fair value through other comprehensive income are not reported separately from other changes in fair value.

(3) Impairment

The Group assesses on a forward looking basis the expected credit losses associated with its debt instruments carried at amortized cost and fair value through other comprehensive income. The impairment methodology applied depends on whether there has been a significant increase in credit risk. For trade receivables and lease receivables, the Group applies the simplified approach, which requires expected lifetime credit losses to be recognized from initial recognition of the receivables.

(4) Recognition and Derecognition

Regular way purchases and sales of financial assets are recognized or derecognized on trade-date, the date on which the Group commits to purchase or sell the asset. Financial assets are derecognized when the rights to receive cash flows from the financial assets have expired or have been transferred and the Group has transferred substantially all the risks and rewards of ownership.

If a transfer does not result in derecognition because the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continues to recognize the transferred asset in its entirety and recognizes a financial liability for the consideration received.

(5) Offsetting of financial instruments

Financial assets and liabilities are offset and the net amount reported in the statements of financial position where there is a legally enforceable right to offset the recognized amounts and there is an intention to settle on a net basis or realize the assets and settle the liability simultaneously. The legally enforceable right must not be contingent on future events and must be enforceable in the normal course of business and in the event of default, insolvency or bankruptcy of the Group or the counterparty.

Derivative Instruments

2.8 Derivative Instruments

Derivatives are initially recognized at fair value on the date a derivative contract is entered into and are subsequently remeasured to their fair value at the end of each reporting period. The accounting for subsequent changes in fair value depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The Group has hedge relationships and designates certain derivatives as:

• hedges of a particular risk associated with the cash flows of recognized assets and liabilities and highly probable forecast transactions (cash flow hedges)

At inception of the hedge relationship, the Group documents the economic relationship between hedging instruments and hedged items including whether changes in the cash flows of the hedging instruments are expected to offset changes in the cash flows of hedged items.

The fair values of derivative financial instruments designated in hedge relationships are disclosed in Note 37.

The full fair value of a hedging derivative is classified as a non-current asset or liability when the remaining maturity of the hedged item is more than 12 months; it is classified as a current asset or liability when the remaining maturity of the hedged item is less than 12 months. A non-derivative financial asset and a non-derivative financial liability is classified as a current or non-current based on its expected maturity and its settlement, respectively.

The effective portion of changes in fair value of derivatives that are designated and qualify as cash flow hedges is recognized in the cash flow hedge reserve within equity, and the ineffective portion is recognized in ‘finance income (costs)’.

Amounts of changes in fair value of effective hedging instruments accumulated in equity are recognized as ‘finance income (costs)’ for the periods when the corresponding transactions affect profit or loss.

When a hedging instrument expires, or is sold, terminated, exercised, or when a hedge no longer meets the criteria for hedge accounting, any accumulated cash flow hedge reserve at that time remains in equity until the forecast transaction occurs, resulting in the recognition of a non-financial asset such as inventory. When the forecast transaction is no longer expected to occur, the cash flow hedge reserve and deferred costs of hedging that were reported in equity are immediately reclassified to profit or loss.

Trade Receivables

2.9 Trade Receivables

Trade receivables are recognized initially at fair value and subsequently measured at amortized cost using the effective interest method, less loss allowance. See Note 6 for further information about the Group’s accounting for trade receivables and Note 2.7 (3) for a description of the Group’s impairment policies.

Inventories

2.10 Inventories

Inventories are stated at the lower of cost and net realizable value. Cost is determined using the moving average method, except for inventories in-transit which is determined using the specific identification method.

Non-current Assets (or Disposal Group) Held-for-sale

2.11 Non-current Assets (or Disposal Group) Held-for-sale

Non-current assets (or disposal group) are classified as held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continuing use and a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less costs to sell.

Property and Equipment

2.12 Property and Equipment

Property and equipment are stated at historical cost less accumulated depreciation and accumulated impairment losses. Historical cost includes expenditures that is directly attributable to the acquisition of the items.

Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:

	Estimated Useful Life
Buildings	5 – 40 years
Structures	5 – 40 years
Machinery and equipment (Telecommunications equipment and others)	2 – 40 years
Others
Vehicles	4 – 6 years
Tools	4 – 6 years
Office equipment	2 – 6 years

The depreciation method, residual values and useful lives of property and equipment are reviewed at the end of each reporting period and, if appropriate, accounted for as changes in accounting estimates.

Investment Property

2.13 Investment Property

Investment property is a property held to earn rentals or for capital appreciation. An investment property is measured initially at its cost. After recognition as an asset, investment property is carried at cost less accumulated depreciation and impairment losses. Investment property, except for land, is depreciated using the straight-line method over their useful lives from 10 to 40 years.

Intangible Assets

2.14 Intangible Assets

(1) Goodwill

Goodwill is measured as explained in Note 2.3 (a) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Gains and losses on the disposal of subsidiaries and business include the carrying amount of goodwill relating to the subsidiaries and business sold.

For the purpose of impairment testing, goodwill acquired in a business combination is allocated to each of the CGUs, or group of CGUs, that is expected to benefit from the synergies of the combination. Goodwill is monitored at the operating segment level.

Goodwill impairment reviews are undertaken annually or more frequently if events or changes in circumstances indicate a potential impairment. The carrying amount of goodwill is compared to the recoverable amount, which is the higher of value in use and the fair value less costs to sell. Any impairment is recognized immediately as an expense and is not subsequently reversed.

(2) Intangible assets except goodwill

Intangible assets, except for goodwill, are initially recognized at its historical cost, and carried at cost less accumulated amortization and accumulated impairment losses. Membership rights (condominium membership and golf membership) that have an indefinite useful life are not subject to amortization because there is no foreseeable limit to the period over which the assets are expected to be utilized. The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:

	Estimated Useful Life
Development costs	5 – 6 years
Software	6 years
Industrial property rights	5 – 50 years
Frequency usage rights	5 – 10 years
Others1	2 – 50 years

¹  Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.

Borrowing Costs

2.15 Borrowing Costs

General and specific borrowing costs that are directly attributable to the acquisition, construction or production of a qualifying asset are capitalized during the period of time that is required to complete and prepare the asset for its intended use or sale. Investment income earned on the temporary investment of specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Other borrowing costs are expensed in the period in which they are incurred.

Government Grants

2.16 Government Grants

Grants from the government are recognized at their fair value where there is a reasonable assurance that the grant will be received and the Group will comply with all attached conditions. Government grants related to assets are presented in the statement of financial position by setting up the grant as deferred income that is recognized in profit or loss on a systematic basis over the useful life of the asset. Grants related to income are presented as a credit in the statement of profit or loss within ‘other income’.

Impairment of Non-Financial Assets

2.17 Impairment of Non-Financial Assets

Goodwill and intangible assets that have an indefinite useful life are not subject to amortization and are tested annually for impairment, or more frequently if events or changes in circumstances indicate that they might be impaired. Other assets are tested for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of an asset’s fair value less costs of disposal and value in use. Non-financial assets other than goodwill that suffered an impairment are reviewed for possible reversal of the impairment at the end of each reporting period.

Trade and other payables

2.18 Trade and other payables

These amounts represent liabilities for goods and services provided to the Group prior to the end of reporting period which are unpaid. Trade and other payables are presented as current liabilities, unless payment is not due within 12 months after the reporting period. They are recognized initially at their fair value and subsequently measured at amortized cost using the effective interest method.

Financial Liabilities

2.19 Financial Liabilities

(1) Classification and measurement

The Group’s financial liabilities at fair value through profit or loss are financial instruments held for trading. A financial liability is held for trading if it is incurred principally for the purpose of repurchasing in the near term. Derivatives that are not designated as hedging instruments or derivatives separated from financial instruments containing embedded derivatives are also categorized as held for trading.

The Group classifies non-derivative financial liabilities, except for financial liabilities at fair value through profit or loss, financial guarantee contracts and financial liabilities that arise when a transfer of financial assets does not qualify for derecognition, as financial liabilities carried at amortized cost and present as ‘trade payables’, ‘borrowings’ and ‘other financial liabilities’ in the statement of financial position.

Preferred shares that require mandatory redemption at a particular date are classified as liabilities. Interest expenses on these preferred shares using the effective interest method are recognized in the statement of profit or loss as ‘finance costs’, together with interest expenses recognized from other financial liabilities.

(2) Derecognition

Financial liabilities are removed from the statement of financial position when it is extinguished; for example, when the obligation specified in the contract is discharged or cancelled or expired or when the terms of an existing financial liability are substantially modified. The difference between the carrying amount of a financial liability extinguished or transferred to another party and the consideration paid (including any non-cash assets transferred or liabilities assumed) is recognized in profit or loss.

Financial Guarantee Contracts

2.20 Financial Guarantee Contracts

Financial guarantee contracts are recognized as a financial liability at the time the guarantee is issued. The liability is initially measured at fair value, subsequently at the higher of following and recognized in the statement of financial position within ‘other financial liabilities’.

• the amount determined in accordance with the expected credit loss model under IFRS 9 Financial Instruments and

• the amount initially recognized less, where appropriate, the cumulative amount of income recognized in accordance with IFRS 15 Revenue from Contracts with Customers

Employee Benefits

2.21 Employee Benefits

(1) Post-employment benefits

The Group operates both defined contribution and defined benefit pension plans.

A defined contribution plan is a pension plan under which the Group pays fixed contributions into a separate entity. The contributions are recognized as employee benefit expenses when an employee has rendered service.

A defined benefit plan is a pension plan that is not a defined contribution plan. Generally, post-employment benefits are payable after the completion of employment, and the benefit amount depended on the employee’s age, periods of service or salary levels. The liability recognized in the statement of financial position in respect of defined benefit pension plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of plan assets. The defined benefit obligation is calculated annually by independent actuaries using the projected unit credit method. The present value of the defined benefit obligation is determined by discounting the estimated future cash outflows using interest rates of high-quality corporate bonds that are denominated in the currency in which the benefits will be paid, and that have terms approximating to the terms of the related obligation. Remeasurement gains and losses arising from experience adjustments and changes in actuarial assumptions are recognized in the period in which they occur, directly in other comprehensive income.

Changes in the present value of the defined benefit obligation resulting from plan amendments or curtailments are recognized immediately in profit or loss as past service costs.

(2) Termination benefits

Termination benefits are payable when employment is terminated by the Group before the normal retirement date, or whenever an employee accepts voluntary redundancy in exchange for these benefits. The Group recognizes termination benefits at the earlier of the following dates: when the entity can no longer withdraw the offer of those benefits or when the entity recognizes costs for a restructuring.

(3) Long-term employee benefits

Certain entities within the Group provide long-term employee benefits that are entitled to employees with service period for ten years and above. The expected costs of these benefits are accrued over the period of employment using the same accounting methodology as used for defined benefit pension plans. The Group recognizes service cost, net interest on other long-term employee benefits and remeasurements as profit or loss for the year. These liabilities are valued annually by an independent qualified actuary.

Share-based payments

2.22 Share-based payments

Equity-settled share-based payment is recognized at fair value of equity instruments granted, and employee benefit expense is recognized over the vesting period. At the end of each period, the Group revises its estimates of the number of options that are expected to vest based on the non-market vesting and service conditions. It recognizes the impact of the revision to original estimates, if any, in profit or loss, with a corresponding adjustment to equity.

Provisions

2.23 Provisions

Provisions for service warranties, make good obligation, and legal claims are recognized when the Group has a present legal or constructive obligation as a result of past events, it is probable that an outflow of resources will be required to settle the obligation and the amount can be reliably estimated. Provisions are measured at the present value of management’s best estimate of the expenditure required to settle the present obligation at the end of the reporting period, and the increase in the provision due to the passage of time is recognized as interest expense.

Leases

2.24 Leases

(1) Lessee

A lease is an agreement, whereby the lessor conveys to the lessee, in return for a payment or series of payments, the right to use an asset for an agreed period of time. Leases where all the risks and rewards of ownership are not transferred to the Group are classified as operating leases. Lease payments under operating leases are recognized as expenses on a straight-line basis over the lease term.

Leases where the Group has substantially all the risks and rewards of ownership are classified as finance leases. Finance leases are capitalized as lease assets and liabilities at the lease’s inception at the fair value of the leased property or, if lower, the present value of the minimum lease payments.

(2) Lessor

A lease is classified as a finance lease if it transfers substantially all the risks and rewards incidental to ownership at the inception of the lease. A lease other than a finance lease is classified as an operating lease. Lease income from operating leases is recognized in income on a straight-line basis over the lease term. Initial direct costs incurred by the lessor in negotiating and arranging an operating lease is added to the carrying amount of the leased asset and recognized as an expense over the lease term on the same basis as the lease income.

Share Capital

2.25 Share Capital

The Group classifies ordinary shares as equity.

Where the Controlling Company purchases its own shares, the consideration paid, including any directly attributable incremental costs, is deducted from equity until the share are cancelled or reissued. When these treasury shares are reissued, any consideration received is including in equity attributable to the equity holders of the Controlling Company.

Revenue Recognition

2.26 Revenue Recognition

In May 2014, the IASB issued IFRS 15, which replaced IAS 18. This standard is applicable to years beginning on or after January 1, 2018. The Group adopted IFRS 15 retrospectively, with the cumulative effects of the initial application being recognized on the date of the initial application, on January 1, 2018. Accordingly, as provided for in this standard, the Group recorded the cumulative effect as at the date of the initial application of the standard as an adjustment to the initial balance in the retained earnings. In accordance with this transition method, the entity applied this pronouncement retrospectively only for contracts that are still in force as at the date of the initial application.

(1) Identification of contracts

The Group performed a comprehensive review of the commercial offers in force, in order to identify the principal contractual clauses and other contractual elements that may be significant regarding the adoption of the new accounting standard.

(2) Identifying performance obligations

With the application of IFRS 15, the Group identifies performance obligations with a customer such as mobile and fixed-line service, Media and content services, financial services and sale of goods. Accordingly, the Group will recognize revenue when, or to the extent that, it satisfies the performance obligations by transferring the goods or services that were promised to the customer.

Mobile and fixed-line service

Telecommunication service revenues include mobile and fixed-line(e.g., fixed-line and VoIP telephone, broadband internet access services and data communication services). These services represent a series of distinct services that is considered a separate performance obligation. Service revenue is recognized when services are provided, based upon either usage (e.g., minutes of traffic/bytes of data processed) or period of time (e.g., monthly service fees).

Media and content services

Revenue from media and content services primarily consists of installation fees and basic monthly charges of IPTV and satellite TV services, as well as revenue from digital content distribution, digital music streaming and downloading.

Media and contents services revenue are recognized when services are provided, based upon either usage or period of time.

Financial services

Financial services primarily include commissions for merchant fees paid by merchants to credit card companies for processing transactions. Revenue from the commission is recognized when the service obligation is performed.

Sale of goods

Revenue from sale of goods, primarily handsets related to our mobile services is recognized when a performance obligation is satisfied by transferring promised goods to customers.

(3) Allocation the transaction price and Revenue recognition

With the application of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer.

The Group verified the existence of two main performance obligations: (i) telecommunication services; and (ii) selling handsets.

To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct good or service underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The standalone selling price is the price at which the Group would sell a promised good or service separately to the customer. The best evidence of a stand-alone selling price is the observable price of a good or service when the Group sells that good or service separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

The adoption of the new revenue standard in some cases resulted in the early recognition of revenue from the sale of handsets, which are usually recognized upon the transfer of control to the customer, basically due to the allocation of discounts between the performance obligations arising from the sale of plans that include mobile services as well as handsets. The difference between the carrying value of sales of handsets, and the amount received from the customer is recorded as a contractual asset and/or liability at the beginning of the contract. Revenue from telecommunication services, in turn, will be recognized in the statement of income based on the allocation of the transaction price, and to the extent that services are being provided to customers in monthly basis.

(4) Incremental contract acquisition costs

The Group pays the commission fees to authorized dealers when new customer subscribe for telecommunication services. The incremental contract acquisition costs are those commission fess that the Group incurs to acquire a contract with a customer that it would not have incurred if the contract had not been acquired. According to IFRS 15, the Group recognizes as an asset the incremental contract acquisition costs and amortize it over the expected period of benefit. However, as a practical expedient, the Group may recognize the incremental contract acquisition costs as an expense when incurred if the amortization period of the asset is one year or less.

Current and Deferred Income Tax

2.27 Current and Deferred Income Tax

The tax expense for the period consists of current and deferred tax. Current and deferred tax is recognized in profit or loss, except to the extent that it relates to items recognized in other comprehensive income or directly in equity. In this case, the tax is also recognized in other comprehensive income or directly in equity, respectively.

The tax expense is measured at the amount expected to be paid to the taxation authorities, using the tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period.

Management periodically evaluates tax policies that are applied in tax returns in which applicable tax regulation is subject to interpretation. The Group recognizes current income tax on the basis of the amount expected to be paid to the tax authorities.

Deferred income tax is provided in full, using the liability method, on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the consolidated financial statements. However, deferred income tax is not accounted for if it arises from initial recognition of an asset or liability in a transaction other than a business combination that at the time of the transaction affects neither accounting nor taxable profit or loss.

Deferred tax assets are recognized only if it is probable that future taxable amount will be available to utilize those temporary differences and losses.

The Group recognizes a deferred tax liability all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint arrangements, except to the extent that the Group is able to control the timing of the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. In addition, The Group recognizes a deferred tax asset for all deductible temporary differences arising from such investments to the extent that it is probable the temporary difference will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized.

Deferred tax assets and liabilities are offset when there is a legally enforceable right to offset current tax assets and liabilities and when the deferred tax balances relate to the same taxation authority. Current tax assets and tax liabilities are offset where the entity has a legally enforceable right to offset and intends either to settle on a net basis.

The Group adopts the consolidated corporate tax return and calculates income tax expenses and income tax liabilities of the Group based on systematic and reasonable methods.

Dividend

2.28 Dividend

Dividend distribution to the Group’s shareholders is recognized as a liability in the financial statements in the period in which the dividends are approved by the Group’s shareholders.

Approval of the Financial Statements

2.29 Approval of the Financial Statements

The consolidated financial statements 2018 were approved for issue by the Board of Directors on March 29, 2019.

XML

General Information (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Consolidated Subsidiaries

The consolidated subsidiaries as at December 31, 2017 and 2018, are as follows:

			Controlling percentage ownership1 (%)
Subsidiary	Type of Business	Location	December 31, 2017	December 31, 2018	Closing month
KT Powertel Co., Ltd.2	Trunk radio system business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	91.4%	92.4%	December
KT Submarine Co., Ltd.2, 4	Submarine cable construction and maintenance	Korea	39.3%	39.3%	December
KT Telecop Co., Ltd.	Security service	Korea	86.8%	86.8%	December
KT Hitel Co., Ltd.	Data communication	Korea	67.1%	67.1%	December
KT Service Bukbu Co., Ltd.	Opening services of fixed line	Korea	67.3%	67.3%	December
KT Service Nambu Co., Ltd.	Opening services of fixed line	Korea	77.3%	77.3%	December
KT Commerce Inc.	B2C, B2B service	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.1	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.2	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.3	Investment fund	Korea	100.0%	100.0%	December
KT Strategic Investment Fund No.4	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	—	100.0%	December
BC Card Co., Ltd.	Credit card business	Korea	69.5%	69.5%	December
VP Inc.	Payment security service for credit card, others	Korea	50.9%	50.9%	December
H&C Network	Call centre for financial sectors	Korea	100.0%	100.0%	December
BC Card China Co., Ltd.	Software development and data processing	China	100.0%	100.0%	December
INITECH Co., Ltd.4	Internet banking ASP and security solutions	Korea	58.2%	58.2%	December
Smartro Co., Ltd.	VAN (Value Added Network) business	Korea	81.1%	81.1%	December
KTDS Co., Ltd.4	System integration and maintenance	Korea	95.5%	95.5%	December
KT M Hows Co., Ltd.	Mobile marketing	Korea	90.0%	90.0%	December
KT M&S Co., Ltd.	PCS distribution	Korea	100.0%	100.0%	December
GENIE Music Corporation(KT Music Corporation)2	Online music production and distribution	Korea	42.5%	36.0%	December
KT MOS Bukbu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	100.0%	December
KT MOS Nambu Co., Ltd.4	Telecommunication facility maintenance	Korea	—	98.4%	December
KT Skylife Co., Ltd.4	Satellite broadcasting business	Korea	50.3%	50.3%	December
Skylife TV Co., Ltd.	TV contents provider	Korea	92.6%	92.6%	December
KT Estate Inc.	Residential building development and supply	Korea	100.0%	100.0%	December
KT AMC Co., Ltd.	Asset management and consulting services	Korea	100.0%	100.0%	December
NEXR Co., Ltd.	Cloud system implementation	Korea	100.0%	100.0%	December
KTSB Data service	Data centre development and related service	Korea	51.0%	51.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3	Online advertisement	Korea	42.8%	42.8%	December
KT Sports Co., Ltd	Management of sports group	Korea	100.0%	100.0%	December
KT Music Contents Fund No.1	Music contents investment business	Korea	80.0%	80.0%	December
KT Music Contents Fund No.2	Music contents investment business	Korea	100.0%	100.0%	December
KT-Michigan Global Content Fund	Content investment business	Korea	88.6%	88.6%	December
Autopion Co., Ltd.	Service for information and communication	Korea	100.0%	100.0%	December
KTCS Corporation2,4	Database and online information provider	Korea	30.9%	30.9%	December
KTIS Corporation2,4	Database and online information provider	Korea	30.1%	30.1%	December
KT M mobile	Special category telecommunications operator and sales of communication device	Korea	100.0%	100.0%	December
KT Investment Co., Ltd.	Technology business finance	Korea	100.0%	100.0%	December
Whowho&Company Co., Ltd.	Software development and supply	Korea	100.0%	100.0%	December
PlayD Co., Ltd. (N Search Marketing Co., Ltd.)	Advertising agency business	Korea	100.0%	100.0%	December
Next connect PFV	Residential building development and supply	Korea	—	100.0%	December
KT Rwanda Networks Ltd.	Network installation and management	Rwanda	51.0%	51.0%	December
AOS Ltd.	System integration and maintenance	Rwanda	51.0%	51.0%	December
KT Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
KT ORS Belgium	Foreign investment business	Belgium	100.0%	100.0%	December
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.zo.o.	Electronic communication business	Poland	94.3%	96.2%	December
Korea Telecom China Co., Ltd.	Foreign telecommunication business	China	100.0%	100.0%	December
KT Dutch B.V.	Super iMax and East Telecom management	Netherlands	100.0%	100.0%	December
Super iMax LLC	Wireless high speed internet business	Uzbekistan	100.0%	100.0%	December
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.0%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. KT Indonesia	Foreign telecommunication business	Indonesia	99.0%	99.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hongkong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
KT Hong Kong Limited	Foreign investment business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December
Texnoprosistem LLP	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Company Limited	Internet advertising solution	Thailand	—	99.9%	December

1 Sum of the ownership interests owned by the Controlling Company and subsidiaries.

2 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company can exercise the majority voting rights in its decision-making process at all times considering the historical voting pattern at the shareholders’ meetings.

3 Although the Controlling Company owns less than 50% ownership in this entity, this entity is consolidated as the Controlling Company holds the majority of voting right based on an agreement with other investors.

4 The number of subsidiaries’ treasury stock is deducted from the total number of shares when calculating the controlling percentage ownership.

Changes in scope of consolidation in 2018 are as follows:

Changes	Location	Subsidiary	Reason
Included	Korea	BC-VP Strategic Investment Fund No.1	Newly established
	Korea	KT MOS Bukbu Co., Ltd.	Acquisition
	Korea	KT MOS Nambu Co., Ltd.	Acquisition
	Korea	Next connect PFV	Newly established
	Thailand	Nasmedia Thailand Company Limited	Newly established
Excluded	Korea	KT New Business Fund No.1	Liquidated

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2016, 2017 and 2018, follows:

(In millions of Korean won)	2016
	Total assets		Total liabilities		Operating revenues		Profit (loss) For the year
KT Powertel Co., Ltd.	￦	113,725	￦	19,899	￦	81,390	￦	202
KT Linkus Co., Ltd.		64,318		56,953		117,587		(3,830	)
KT Submarine Co., Ltd.		156,993		55,573		84,137		5,146
KT Telecop Co., Ltd.		265,553		132,344		315,948		143
KT Hitel Co., Ltd.		249,202		46,941		198,994		4,298
KT Service Bukbu Co., Ltd.		32,863		24,580		182,952		694
KT Service Nambu Co., Ltd.		32,621		24,282		218,602		772
BC Card Co., Ltd.1		3,651,065		2,602,404		3,567,512		163,131
H&C Network1		272,110		80,983		266,613		14,749
Nasmedia Co., Ltd.1		263,925		159,502		70,037		11,972
KTDS Co., Ltd.1		197,970		151,644		476,379		10,838
KT M Hows Co., Ltd.		28,539		18,466		19,922		2,865
KT M&S Co., Ltd.		247,854		227,507		724,144		(12,955	)
GENIE Music Corporation(KT Music Corporation)		110,080		41,953		111,450		8,235
KT Skylife Co., Ltd.1		777,948		231,452		668,945		68,863
KT Estate Inc.1		1,734,729		375,341		405,417		46,815
KTSB Data service		20,075		759		5,136		(1,983	)
KT Innoedu Co., Ltd.		6,477		7,259		15,599		103
KT Sat Co., Ltd.		744,653		253,041		144,594		36,266
KT Sports		16,925		13,573		48,476		(198	)
KT Music Contents Fund No.1		10,592		331		349		103
KT-Michigan Global Content Fund		16,250		163		133		(514	)
Autopion Co., Ltd.		6,163		2,794		7,772		(409	)
KT M mobile		131,446		20,369		112,532		(40,041	)
KT Investment Co., Ltd.1		39,506		23,123		10,130		(1,832	)
NgeneBio		6,361		4,733		244		(1,833	)
KTCS Corporation1		322,768		166,642		955,050		7,892
KTIS Corporation		221,176		63,871		436,914		9,991
Korea Telecom Japan Co., Ltd.		3,592		5,374		5,122		(1,391	)
Korea Telecom China Co., Ltd.		532		188		930		60
KT Dutch B.V.		34,197		73		166		85
Super iMax LLC		10,308		6,734		10,759		(1,802	)
East Telecom LLC		31,885		16,554		27,492		3,257
Korea Telecom America, Inc.		4,464		1,306		7,113		181
PT. KT Indonesia		16		—		—		(7	)
KT Rwanda Networks Ltd.		167,112		138,651		13,435		(31,455	)
KT Belgium		79,391		7		—		(67	)
KT ORS Belgium		2,013		23		—		(46	)
KBTO sp.zo.o.		1,166		2,378		21		(2,587	)
AOS Ltd.		10,025		3,179		14,481		(1,123	)
KT Hongkong Telecommunications Co., Ltd.		1,571		956		1,568		120

(In millions of Korean won)	2017
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	115,125	￦	18,937	￦	69,234	￦	2,112
KT Linkus Co., Ltd.		59,344		51,516		112,043		725
KT Submarine Co., Ltd.		142,797		34,056		73,985		8,243
KT Telecop Co., Ltd.		264,353		131,633		317,591		2,885
KT Hitel Co., Ltd.		258,240		52,943		227,884		3,225
KT Service Bukbu Co., Ltd.		29,281		22,096		194,837		688
KT Service Nambu Co., Ltd.		36,076		26,412		232,996		875
BC Card Co., Ltd.1		4,048,263		2,955,038		3,628,995		156,109
H&C Network1		273,856		65,446		277,622		16,104
Nasmedia Co., Ltd.1		315,967		188,197		120,667		26,676
KTDS Co., Ltd.1		144,922		93,343		459,266		11,584
KT M Hows Co., Ltd.		42,738		28,489		24,610		4,097
KT M&S Co., Ltd.		242,388		231,151		734,420		(9,707	)
GENIE Music Corporation (KT Music Corporation)		139,686		48,512		156,163		(3,401	)
KT Skylife Co., Ltd.1		792,893		210,550		687,752		57,314
KT Estate Inc.1		1,869,194		502,915		428,446		52,416
KTSB Data service		18,306		605		4,950		(1,651	)
KT Sat Co., Ltd.		742,391		220,804		147,649		29,601
KT Sports		11,131		7,805		53,357		(199	)
KT Music Contents Fund No.1		13,804		1,041		370		(499	)
KT Music Contents Fund No.2		7,500		11		—		(11	)
KT-Michigan Global Content Fund		14,575		147		159		(426	)
Autopion Co., Ltd.		6,306		3,530		6,679		(618	)
KT M mobile		93,601		21,453		159,684		(38,883	)
KT Investment Co., Ltd.1		54,673		38,313		8,794		(619	)
KTCS Corporation1		348,334		188,764		968,186		7,385
KTIS Corporation		223,818		62,569		438,597		8,337
Korea Telecom Japan Co., Ltd.1		1,554		2,788		2,772		536
Korea Telecom China Co., Ltd.		665		32		1,030		348
KT Dutch B.V.		30,312		50		206		169
Super iMax LLC		3,449		4,886		7,314		(4,584	)
East Telecom LLC1		11,672		11,748		19,663		(9,118	)
Korea Telecom America, Inc.		3,694		791		6,783		109
PT. KT Indonesia		8		—		—		(6	)
KT Rwanda Networks Ltd.2		151,359		139,561		15,931		(22,762	)
KT Belgium		86,455		8		49		(2	)
KT ORS Belgium		1,769		14		10		(10	)
KBTO sp.zo.o.		3,311		2,268		67		(3,456	)
AOS Ltd.2		9,437		4,519		8,952		(682	)
KT Hongkong Telecommunications Co., Ltd.		2,578		1,497		7,304		494

(In millions of Korean won)	2018
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	124,064	￦	28,217	￦	65,620	￦	(5,545	)
KT Linkus Co., Ltd.		54,147		44,895		106,337		1,216
KT Submarine Co., Ltd.		130,715		27,530		61,652		(4,286	)
KT Telecop Co., Ltd.		272,492		140,314		328,262		166
KT Hitel Co., Ltd.		272,708		66,043		279,117		657
KT Service Bukbu Co., Ltd.		30,599		23,964		195,961		(31	)
KT Service Nambu Co., Ltd.		37,452		27,939		230,088		160
BC Card Co., Ltd.1		3,722,379		2,630,536		3,551,715		70,889
H&C Network1		245,841		63,188		297,470		(15,944	)
Nasmedia Co., Ltd.1		303,112		161,164		106,805		20,596
KTDS Co., Ltd.1		148,675		95,834		434,302		8,586
KT M Hows Co., Ltd.		60,197		42,386		26,673		3,691
KT M&S Co., Ltd.		228,073		207,740		791,652		11,408
GENIE Music Corporation (KT Music Corporation)		221,559		75,827		171,314		6,374
KT MOS Bukbu Co., Ltd.		14,121		10,571		16,543		(782	)
KT MOS Nambu Co., Ltd.		14,313		8,927		14,941		(2,418	)
KT Skylife Co., Ltd.1		816,001		149,841		694,059		52,010
KT Estate Inc.1		1,695,995		304,712		569,269		51,854
KTSB Data service		8,632		523		4,627		(9,576	)
KT Sat Co., Ltd.		685,926		173,513		137,186		4,921
KT Sports Co., Ltd.		9,560		6,376		55,565		(154	)
KT Music Contents Fund No.1		14,092		1,035		559		294
KT Music Contents Fund No.2		7,629		281		150		(142	)
KT-Michigan Global Content Fund		12,741		—		869		(670	)
Autopion Co., Ltd.		8,838		5,801		12,035		453
KT M mobile		146,334		35,335		172,674		(10,085	)
KT Investment Co., Ltd.1		74,580		58,040		8,095		247
KTCS Corporation1		350,280		188,561		1,019,787		11,401
KTIS Corporation		229,246		68,997		451,532		7,900
Next connect PFV		385,769		34,370		143		(12,449	)
Korea Telecom Japan Co., Ltd.1		1,326		2,910		1,965		(126	)
Korea Telecom China Co., Ltd.		661		22		681		10
KT Dutch B.V.		31,693		41		191		105
Super iMax LLC		4,150		4,528		4,845		(424	)
East Telecom LLC1		16,590		14,263		15,087		2,639
Korea Telecom America, Inc.		4,218		832		7,554		350
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		144,129		162,801		15,150		(29,238	)
KT Belgium		90,172		1		29		(43	)
KT ORS Belgium		6,709		5		—		(46	)
KBTO sp.zo.o.		1,364		217		202		(3,771	)
AOS Ltd.2		14,018		4,952		6,300		(680	)
KT Hongkong Telecommunications Co., Ltd.		3,616		2,143		9,990		351

1 These companies are the intermediate controlling companies of other subsidiaries and the above financial information is from their consolidated financial statements.

2 At the end of the reporting period, convertible preferred stock issued by subsidiaries is included in liabilities.

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Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Estimated Useful Lives of Property, Plant and Equipment

Depreciation of all property, plant and equipment, except for land, is calculated using the straight-line method to allocate their cost, net of their residual values, over their estimated useful lives as follows:

	Estimated Useful Life
Buildings	5 – 40 years
Structures	5 – 40 years
Machinery and equipment (Telecommunications equipment and others)	2 – 40 years
Others
Vehicles	4 – 6 years
Tools	4 – 6 years
Office equipment	2 – 6 years

Summary of Amortization of Intangible Assets With Limited Useful Life

 The Group amortizes intangible assets with a limited useful life using the straight-line method over the following periods:

	Estimated Useful Life
Development costs	5 – 6 years
Software	6 years
Industrial property rights	5 – 50 years
Frequency usage rights	5 – 10 years
Others1	2 – 50 years

¹  Membership rights (condominium membership and golf membership) and broadcast license included in others are classified as intangible assets with indefinite useful life.

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Financial Instruments by Category (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Financial Instruments by Category

Financial instruments by category as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
Financial assets	Loans and receivables		Assets at fair value through profit and loss		Derivatives used for hedge		Available- for-sale		Held-to- Maturity		Total
Cash and cash equivalents	￦	1,928,182	￦	—	￦	—	￦	—	￦	—	￦	1,928,182
Trade and other receivables		6,793,397		—		—		—		—		6,793,397
Other financial assets		1,333,317		5,813		7,389		380,953		151		1,727,623

(In millions of Korean won)	December 31, 2017
Financial liabilities	Liabilities at fair value through profit and loss		Derivatives used for hedge		Financial liabilities at amortized cost		Total
Trade and other payables	￦	—	￦	—	￦	8,427,457	￦	8,427,457
Borrowings		—		—		6,683,662		6,683,662
Other financial liabilities		5,051		93,770		87,670		186,491

(In millions of Korean won)	December 31, 2018
Financial assets	Financial assets at amortized cost		Financial assets at fair value through profit or loss		Financial assets at fair value through other comprehensive income		Derivatives used for hedging		Total
Cash and cash equivalents	￦	2,703,422	￦	—	￦	—	￦	—	￦	2,703,422
Trade and other receivables		5,425,996		—		1,097,348		—		6,523,344
Other financial assets		484,271		777,685		326,157		29,843		1,617,956

(In millions of Korean won)	December 31, 2018
Financial liabilities	Financial liabilities at amortized cost		Financial liabilities at fair values through profit and loss		Derivatives used for hedging		Total
Trade and other payables	￦	8,521,379	￦	—	￦	—	￦	8,521,379
Borrowings		6,648,293		—		—		6,648,293
Other financial liabilities		99,330		7,758		57,308		164,396

Summary of Gains or Losses Arising From Financial Instruments by Category

Gains or losses arising from financial instruments by category for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Financial assets at amortized cost
Interest income1	￦	129,813		￦	108,608		￦	93,233
Gain(loss) on foreign currency transaction4		(7,493	)		(11,949	)		19,396
Gain(loss) on foreign currency translation		3,083			(12,354	)		(2,901	)
Gain(loss) on disposal		(15,838	)		(20,351	)		44
Loss on valuation		(92,589	)		(44,219	)		(110,544	)
Financial assets at fair value through profit or loss
Interest income1		—			—			9,194
Dividend income		—			—			1,207
Gain on valuation		—			—			10,768
Gain on disposal		—			—			1,713
Financial assets at fair value through other comprehensive income
Interest income1		—			—			163,390
Dividend income		—			—			1,704
Impairment loss		—			—			(2,416	)
Loss on disposal		—			—			(13,818	)
Other comprehensive income for the year2		—			—			43,811
Assets at fair value through profit or loss
Dividend income		—			1			—
Gain on disposal		186			153			—
Loss on valuation		(7,184	)		(464	)		—
Derivatives used for hedging
Gain(loss) on transaction		—			(58,569	)		7,272
Gain(loss) on valuation		109,436			(63,640	)		22,065
Other comprehensive income for the year2		60,501			(44,429	)		20,078
Reclassified to profit or loss from other comprehensive income for the year2,3		(71,915	)		50,231			(15,891	)
Available-for-sale
Interest income1		40			453			—
Dividend income		3,926			5,174			—
Gain on disposal		22,695			89,598			—
Impairment loss		(966	)		(6,137	)		—
Other comprehensive income for the year2		10,925			51,235			—
Reclassified to profit or loss from other comprehensive income for the year2		(3,840	)		(55,450	)		—
Held-to-Maturity
Interest income1,4		213			—			—
Financial liabilities at fair value through profit or loss
Loss on disposal		(632	)		—			—
Gain(loss) on valuation		33			(3,078	)		(2,708	)
Derivatives used for hedging
Gain on transactions		8,329			—			20,678
Loss on valuation		(138	)		(145,885	)		42,195
Other comprehensive income for the year2		4,295			(66,624	)		(2,810	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(3,956	)		91,698			(28,388	)
Financial liabilities at amortized cost
Interest expense1		(337,219	)		(302,464	)		(296,894	)
Gain(loss) on repayment		—			—			(15	)
Gain(loss) foreign currency transaction4		(7,518	)		62,347			(30,956	)
Gain(loss) foreign currency translation		(112,864	)		225,695			(66,050	)
Total	￦	(308,677	)	￦	(150,420	)	￦	(116,643	)

1 BC Card, a subsidiary of the Group, recognized interest income as operating revenue. Interest income recognized as operating revenue is ￦21,021 million (2016: ￦14,380 million, 2017: ￦15,561 million) for the year ended December 31, 2018.

2 The amounts directly reflected in equity after adjustments of deferred income tax.

3 During the year, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year.

4 BC Card recognized gain/loss on foreign currency transaction as operating income and expenses. During the year, related gain/loss on foreign currency transaction recognized as operating income and expense is ￦20,422 million (2016: (-) ￦1,987 million, 2017: ￦11,049 million).

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Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Restricted Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	Type	December 31, 2017	December 31, 2018	Description
Restricted cash and cash equivalents	Restricted deposit	￦16,837	￦23,970	Deposit restricted for governmental project and others

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Trade and Other Receivables (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Trade and Other Receivables

Trade and other receivables as at December 31, 2017 and 2018 are as follows:

	December 31, 2017
(In millions of Korean won)	Total amounts		Allowance for doubtful accounts			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,405,947	￦	(438,817	)	￦	(7,508	)	￦	2,959,622
Other receivables		3,071,532		(66,402	)		(187	)		3,004,943
	￦	6,477,479	￦	(505,219	)	￦	(7,695	)	￦	5,964,565
Non-current assets
Trade receivables	￦	366,108	￦	(610	)	￦	(12,803	)	￦	352,695
Other receivables		522,458		(17,970	)		(28,351	)		476,137
	￦	888,566	￦	(18,580	)	￦	(41,154	)	￦	828,832

	December 31, 2018
(In millions of Korean won)	Total amounts		Expected credit losses			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,422,086	￦	(357,548	)	￦	(9,873	)	￦	3,054,665
Other receivables		2,700,792		(74,948	)		(160	)		2,625,684
	￦	6,122,878	￦	(432,496	)	￦	(10,033	)	￦	5,680,349
Non-current assets
Trade receivables	￦	402,027	￦	(2,376	)	￦	(17,970	)	￦	381,681
Other receivables		506,061		(18,874	)		(25,873	)		461,314
	￦	908,088	￦	(21,250	)	￦	(43,843	)	￦	842,995

Summary of Changes in Allowance for Doubtful Accounts

Details of changes in allowance for doubtful accounts the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016						2017						2018
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	468,741		￦	250,842		￦	470,871		￦	141,616		￦	439,427		￦	84,372
Provision		84,975			7,736			38,888			5,809			91,282			21,783
Reversal or written-off		(80,518	)		(108,638	)		(70,121	)		(61,220	)		(170,597	)		(14,520	)
Changes in the scope of consolidation		215			56			(107	)		(35	)		—			—
Others		(2,542	)		(8,380	)		(104	)		(1,798	)		(188	)		2,187
Ending balance	￦	470,871		￦	141,616		￦	439,427		￦	84,372		￦	359,924		￦	93,822

Summary of Other Receivables

Details of other receivables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Loans	￦	84,682		￦	88,476
Receivables1		3,000,849			2,612,753
Accrued income		12,186			10,171
Refundable deposits		391,458			370,481
Loans receivable		34,273			54,952
Finance lease receivables		20,526			22,230
Others		21,478			21,757
Less: Allowance for doubtful accounts		(84,372	)		(93,822	)
	￦	3,481,080		￦	3,086,998

1 The settlement receivables of BC Card Co., Ltd. of ￦1,895,575 million (2017: ￦2,262,829 million) are included.

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Other Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Other Financial Assets and Liabilities

Details of other financial assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other financial assets
Financial assets at amortized cost1,2	￦	1,333,368		￦	484,271
Financial assets at fair value through profit or loss1,2,3		5,913			777,685
Financial assets at fair value through other comprehensive income2		—			326,157
Available-for-sale financial assets		380,953			—
Derivative used for hedging		7,389			29,843
Less: Non-current		(754,992	)		(623,176	)
Current	￦	972,631		￦	994,780
Other financial liabilities
Financial liabilities at amortized cost	￦	87,669		￦	99,330
Financial liabilities at fair value through profit or loss		5,051			7,758
Derivatives used for hedging		93,771			57,308
Less: Non-current		(149,267	)		(163,454	)
Current	￦	37,224		￦	942

1 As at December 31, 2018, the Group’s financial assets amounting to ￦60,978 million (2017: ￦59,660 million), which consist of checking account deposits, deposits for Win-win Growth Cooperative loans and payment guarantee, are subject to withdrawal restrictions.

2 In the prior year, a portion of the equity instruments was classified as available-for-sale financial assets and held-to-maturity financial assets

3 As at December 31, 2018, MMW(Money Market Wrap) and MMT(Money Market Trust) amounting to ￦610,862 million is included in other financial assets.

Summary of Financial Assets at Fair Value Through Profit or Loss

Details of financial assets at fair value through profit or loss as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)		121
Equity Instruments (Unlisted)		62,911
Debt securities		714,653
Total		777,685
Less: non-current		(269,148	)
Current	￦	508,537

Summary of Financial Assets at Fair Value Through Other Comprehensive Income

Details of financial asset at fair value through other comprehensive income as at December 31, 2018 are as follows:

(In millions of Korean won)	December 31, 2018
Equity Instruments (Listed)	￦	8,861
Equity Instruments (Unlisted)		310,387
Debt securities		6,909
Total		326,157
Less: non-current		(326,157	)
Current	￦	—

Summary of Derivative Financial Assets and Liabilities

Derivatives used for hedge as at December 31, 2017 and 2018, are as follows:

	December 31, 2017						December 31, 2018
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	2,633		￦	—		￦	599
Currency swap2		7,389			81,300			29,843			54,074
Currency forwards3		—			9,838			—			2,635
Total		7,389			93,771			29,843			57,308
Less: non-current		(4,675	)		(56,547	)		(4,732	)		(56,366	)
Current	￦	2,714		￦	37,224		￦	25,111		￦	942

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the bond.

2 The currency swap contract is to hedge the risk of variability in cash flow from the bond. In applying the cash flow hedge accounting, the Group hedges its exposures to cash flow fluctuation until September 7, 2034.

3 The currency forward contract is to hedge the risk of variability in cash flow from transactions in foreign currencies due to changes in foreign exchange rate.

Summary of Valuation Gains and Losses on Derivatives Contracts

The valuation gains and losses on the derivatives contracts for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016							2017							2018
Type of Transaction	Valuation gain		Valuation loss			Other comprehensive income1		Valuation gain		Valuation loss		Other comprehensive income1			Valuation gain		Valuation loss		Other comprehensive income1
Interest rate swap	￦	—	￦	148		￦	(142)	￦	38	￦	—	￦	637		￦	192	￦	—	￦	(488)
Currency swap		97,158		(10	)		85,479		19		187,468		(146,752	)		58,912		2,045		22,139
Currency forwards		12,278		—			146		—		22,114		(393	)		7,201		—		—
Total	￦	109,436	￦	138		￦	85,483	￦	57	￦	209,582	￦	(146,508)		￦	66,305	￦	2,045	￦	21,651

1 The amounts before adjustments of deferred income tax directly reflected in equity and allocation to the non-controlling interest.

Summary of Financial Liabilities at Fair Value Through Profit or Loss

Details of financial liabilities at fair value through profit or loss as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	5,051	￦	7,758

Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss

The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017				2018
	Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	3,078	￦	—	￦	2,707

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Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Inventories Net

Inventories as at December 31, 2017 and 2018, are as follows:

	December 31, 2017							December 31, 2018
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	504,321	￦	(58,293	)	￦	446,028	￦	794,020	￦	(113,581	)	￦	680,439
Others		195,999		—			195,999		394,195		—			394,195
Total	￦	700,320	￦	(58,293	)	￦	642,027	￦	1,188,215	￦	(113,581	)	￦	1,074,634

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Other Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Other Assets and Liabilities

Other assets and liabilities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Other assets
Advance payments	￦	164,950		￦	162,784
Prepaid expenses1		241,078			1,667,372
Contract assets1		—			398,797
Others		5,997			4,490
Less: Non-current		(107,165	)		(545,895	)
Current	￦	304,860		￦	1,687,548
Other liabilities
Advances received	￦	375,792		￦	518,914
Withholdings		85,142			89,403
Unearned revenue		23,036			39,528
Contract liabilities1		—			347,462
Others		11,628			24,908
Less: Non-current		(237,284	)		(423,626	)
Current	￦	258,314		￦	596,589

1 As explained in Note 2, amounts include adjustments arising from adoption of IFRS 15(notes 26 and 41)

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Changes in Property and Equipment

Changes in property and equipment for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,309,084		￦	3,729,228		￦	35,106,184		￦	1,895,332		￦	1,093,941		￦	43,133,769
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,604,496	)		(25,845,999	)		(1,370,409	)		(622	)		(28,821,658	)
Beginning, net		1,308,952			2,124,732			9,260,185			524,923			1,093,319			14,312,111
Acquisition and capital expenditure		1,948			120			237,218			129,464			2,262,681			2,631,431
Disposal and termination		(4,656	)		(4,022	)		(176,085	)		(8,242	)		(3,133	)		(196,138	)
Depreciation		—			(135,242	)		(2,469,459	)		(150,535	)		—			(2,755,236	)
Impairment		—			—			(9,256	)		(1	)		(28	)		(9,285	)
Transfer in (out)		26,764			25,305			2,227,808			10,344			(2,600,908	)		(310,687	)
Exclusion from scope of consolidation		—			(19	)		(772	)		(120	)		(34	)		(945	)
Transfer from(to) investment properties		(64,449	)		1,793			—			1,184			—			(61,472	)
Others		98			(245	)		(8,830	)		(179	)		(38,304	)		(47,460	)
Ending, net	￦	1,268,657		￦	2,012,422		￦	9,060,809		￦	506,838		￦	713,593		￦	13,562,319
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)

	2018
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,268,789		￦	3,750,861		￦	35,971,877		￦	1,920,571		￦	714,706		￦	43,626,804
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,738,439	)		(26,911,068	)		(1,413,733	)		(1,113	)		(30,064,485	)
Beginning, net		1,268,657			2,012,422			9,060,809			506,838			713,593			13,562,319
Acquisition and capital expenditure		9,897			1,728			137,088			101,832			2,037,085			2,287,630
Disposal and termination		(3,718	)		(2,640	)		(113,266	)		(4,336	)		(582	)		(124,542	)
Depreciation		—			(132,353	)		(2,398,782	)		(159,625	)		—			(2,690,760	)
Impairment		—			(5,551	)		(1,237	)		(8,935	)		(170	)		(15,893	)
Transfer in (out)		7,663			127,052			1,767,878			9,525			(1,911,094	)		1,024
Inclusion in scope of consolidation		—			44			4,228			2,526			—			6,798
Transfer from(to) investment properties		(3,080	)		5,366			—			37,077			—			39,363
Others		1,768			1,617			18,298			(6,521	)		(12,844	)		2,318
Ending, net	￦	1,281,187		￦	2,007,685		￦	8,475,016		￦	478,381		￦	825,988		￦	13,068,257
Acquisition cost	￦	1,281,319		￦	3,873,074		￦	36,327,007		￦	1,981,646		￦	826,583		￦	44,289,629
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,865,389	)		(27,851,991	)		(1,503,265	)		(595	)		(31,221,372	)

Summary of the Details of Property and Equipment Provided

Details of property and equipment provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,115	￦	15,995		Borrowings	￦	2,730	Standard Chartered Bank, Korea Development Bank
Others		53,757		38,570				16,071	Shinhan Bank

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	13,163	￦	15,113		Borrowings	￦	7,878	Standard Chartered Bank, Korea Development Bank
Others		50,278		40,252				10,063	Shinhan Bank

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Investment Properties (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Investment Properties

Changes in investment properties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	302,750		￦	1,119,885		￦	78,765		￦	1,501,400
Less: Accumulated depreciation		—			(353,356	)		—			(353,356	)
Beginning, net		302,750			766,529			78,765			1,148,044
Acquisition		—			775			48,075			48,850
Disposal and termination		(3,493	)		(6,434	)		—			(9,927	)
Depreciation		—			(47,295	)		—			(47,295	)
Transfer from(to) property and equipment		64,449			(1,793	)		(1,184	)		61,472
Transfer and others		(6,916	)		80,986			(85,683	)		(11,613	)
Ending, net	￦	356,790		￦	792,768		￦	39,973		￦	1,189,531
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(398,919	)		—			(400,487	)

(In millions of Korean won)	2018
	Land			Buildings			Construction- in-progress			Total
Acquisition cost	￦	358,358		￦	1,191,687		￦	39,973		￦	1,590,018
Less: Accumulated depreciation		(1,568	)		(398,919	)		—			(400,487	)
Beginning, net		356,790			792,768			39,973			1,189,531
Acquisition		1,111			7			74,145			75,263
Disposal and termination		(4,729	)		(10,238	)		—			(14,967	)
Depreciation		—			(44,653	)		—			(44,653	)
Transfer from(to) property and equipment		3,080			(5,366	)		(37,077	)		(39,363	)
Transfer and others		(7,404	)		9,597			(76,920	)		(74,727	)
Ending, net	￦	348,848		￦	742,115		￦	121		￦	1,091,084
Acquisition cost	￦	350,417		￦	1,168,379		￦	121		￦	1,518,917
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,569	)		(426,264	)		—			(427,833	)

Summary of Investment Properties Provided as Collateral

Details of investment properties provided as collateral as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	583,778	￦	74,963	Deposits	￦	63,923
Land and Buildings	￦	7,897	￦	7,905	Borrowings	￦	5,270

(In millions of Korean won)	December 31, 2018
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	548,567	￦	66,551	Deposits	￦	59,492
Land and Buildings	￦	5,292	￦	3,987	Borrowings	￦	3,322

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Intangible Assets

Changes in intangible assets for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Goodwill			Development costs1			Software			Frequency usage rights			Others			Total
Acquisition cost		492,105			1,483,205			838,532			2,531,654			1,154,993			6,500,489
Less: Accumulated amortization (including accumulated impairment loss and others)		(238,619	)		(1,148,529	)		(641,394	)		(854,365	)		(594,779	)		(3,477,686	)
Beginning, net	￦	253,486		￦	334,676		￦	197,138		￦	1,677,289		￦	560,214		￦	3,022,803
Acquisition and capital expenditure		—			247,863			60,475			—			78,373			386,711
Disposal and termination		—			(14,806	)		(548	)		—			(11,859	)		(27,213	)
Amortization		—			(151,718	)		(73,174	)		(311,146	)		(99,112	)		(635,150	)
Impairment		(84,606	)		—			(3	)		—			(31,486	)		(116,095	)
Exclusion in scope of consolidation		—			(332	)		(3,216	)		—			(1,374	)		(4,922	)
Others		—			2,876			9,569			(1,201	)		(4,674	)		6,570
Ending, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,704
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,014
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)

1 The Group’s development costs mainly consist of acquisition costs to develop a combined billing system and an information management system.

	2018
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
Acquisition cost		474,908			1,643,886			893,500			2,530,341			1,171,378			6,714,013
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,028	)		(1,225,327	)		(703,259	)		(1,165,399	)		(681,297	)		(4,081,310	)
Beginning, net	￦	168,880		￦	418,559		￦	190,241		￦	1,364,942		￦	490,081		￦	2,632,703
Acquisition and capital expenditure		—			56,670			29,800			1,110,865			133,837			1,331,172
Disposal and termination		—			(3,436	)		(736	)		(558	)		(10,687	)		(15,417	)
Amortization		—			(147,304	)		(72,185	)		(318,815	)		(91,222	)		(629,526	)
Impairment		(518	)		—			(222	)		—			(12,256	)		(12,996	)
Inclusion in scope of consolidation		67,696			—			2,073			—			23,950			93,719
Others		—			10,621			16,973			66			(20,192	)		7,468
Ending, net	￦	236,058		￦	335,110		￦	165,944		￦	2,156,500		￦	513,511		￦	3,407,123
Acquisition cost		542,074			1,680,372			947,312			3,641,231			1,253,281			8,064,270
Less; Accumulated amortization (including accumulated impairment loss and others)		(306,016	)		(1,345,262	)		(781,368	)		(1,484,731	)		(739,770	)		(4,657,147	)

Summary of Goodwill Allocated to Each Cash-Generation Unit

Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As at December 31, 2018, goodwill allocated to each cash-generation unit is as follows:

(In millions of Korean won) Cash generating Unit	Amount
Marketing/Customer
Telecom Wireless business1	￦	65,057
Finance
BC Card Co., Ltd.2		41,234
Others
GENIE Music Corporation (KT Music Corporation)3		55,114
PlayD Co., Ltd. (N SEARCH MARKETING Corporation)4		42,745
KT Telecop Co., Ltd.1		15,418
KT MOS Bukbu Co., Ltd and others		16,490
Total	￦	236,058

1 The recoverable amounts of mobile business are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 1.34% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 7.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on mobile business for the years ended December 31, 2018 and 2017.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 2.80% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 15.53% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018 and 2017.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on value in use calculation or fair value less cost to sell.

4 The recoverable amounts of PlayD Co., Ltd. (N search Marketing Co., Ltd.) are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 1.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 5.44% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.42% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGUs does not exceed the recoverable amount. Accordingly, the Group did not recognize the impairment loss on goodwill on PlayD Co., Ltd. (N search Marketing Co., Ltd.) for the years ended December 31, 2018 and 2017.

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Investments in Associates and Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Details of Associates

Details of associates as at December 31, 2017 and 2018, are as follows:

	Percentage of ownership (%)						Location	Date of financial statements
	2017			2018
Korea Information & Technology Fund		33.3	%		33.3	%	Korea		December 31
KT-SB Venture Investment Fund1		50.0	%		50.0	%	Korea		December 31
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%	Korea		December 31
KT-CKP New Media Investment Fund		49.7	%		49.7	%	Korea		December 31
K Bank Inc.1		10.0	%		10.0	%	Korea		December 31

1 At the end of the reporting period, even though the Group (KT-SB Venture Investment Fund and KT-IBKC Future Investment Fund 1) has 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, cannot participate in determining the operating and financial policies. Also, 8.8% of non-voting convertible stock are excluded in deriving percentage of ownership of K bank Inc.

Summary of Changes in Investments in Associates and Joint Ventures

Changes in investments in associates and joint ventures for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures			Impairment			Others			Ending
Korea Information & Technology Fund	￦	134,969	￦	—		￦	4,275		￦	—		￦	290		￦	139,534
KT-SB Venture Investment Fund		4,736		(1,069	)		(725	)		—			—			2,942
Mongolian Telecommunications		6,244		—			(348	)		—			(5,896	)		—
KT Wibro Infra Co., Ltd.		52,200		(52,200	)		—			—			—			—
KT-IBKC Future Investment Fund1		3,621		7,500			(296	)		—			—			10,825
KT-CKP New Media Investment Fund		4,454		(2,970	)		810			—			—			2,294
K Bank Inc.		—		26,543			(17,244	)		—			32,809			42,108
Others		77,851		3,178			(1,952	)		(3,662	)		6,313			81,728
	￦	284,075	￦	(19,018	)	￦	(15,480	)	￦	(3,662	)	￦	33,516		￦	279,431

	2018
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Impairment		Others			Ending
Korea Information & Technology Fund	￦	139,534	￦	—		￦	15,037		￦	—	￦	(6,316	)	￦	148,255
KT-SB Venture Investment Fund		2,942		—			1,528			—		—			4,470
KT-IBKC Future Investment Fund1		10,825		(1,050	)		1,028			—		(842	)		9,961
KT-CKP New Media Investment Fund		2,294		(1,229	)		(784	)		—		—			281
K Bank Inc.		42,108		26,725			(19,504	)		—		3,326			52,655
Others2		81,728		2,466			8,607			—		(36,016	)		56,785
	￦	279,431	￦	26,912		￦	5,912		￦	—	￦	(39,848	)	￦	272,407

1 KT investment Co., Ltd., a subsidiary of the Group, recognized its share in net profit from associates and joint ventures as operating revenue and expense. These include its share in net loss from associates and joint ventures of ￦445 million (2017:￦1,588 million) recognized as operating expense during the period.

2 The Group classified total shares of PT Mitra Transksi Indonesia as assets held for sale (Note 10).

Summary of Financial Information of Associates and Joint Ventures

Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	144,874	￦	273,727	￦	—	￦	—
KT-SB Venture Investment		120		5,770		6		—
KT-IBKC Future Investment Fund 1		5,499		16,302		152		—
KT-CKP New Media Investment Fund		287		4,333		—		—
K Bank Inc.		1,258,969		92,137		1,116,154		1,177

(In millions of Korean won)	2017
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	36,462	￦	12,825		￦	1,868		￦	14,693		￦	739
KT-SB Venture Investment		3		(1,449	)		—			(1,449	)		—
KT-IBKC Future Investment Fund 1		15		(593	)		—			(593	)		—
KT-CKP New Media Investment Fund		1,593		1,632			—			1,632			—
K Bank Inc.		20,926		(83,787	)		(746	)		(84,533	)		—

(In millions of Korean won)	December 31, 2018
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	118,024	￦	326,740	￦	—	￦	—
KT-SB Venture Investment		4,322		4,624		6		—
KT-IBKC Future Investment Fund 1		19,922		—		—		—
KT-CKP New Media Investment Fund		25		540		—		—
K Bank Inc.		2,094,152		90,505		1,901,389		3,185

(In millions of Korean won)	2018
	Operating revenue		Profit (loss) for the year			Other comprehensive income			Total comprehensive income			Dividends received from associates
Korea Information & Technology Fund	￦	59,524	￦	45,110		￦	(13,422	)	￦	31,688		￦	1,842
KT-SB Venture Investment		—		3,056			—			3,056			—
KT-IBKC Future Investment Fund 1		2,665		2,057			—			2,057			—
KT-CKP New Media Investment Fund		371		(629	)		—			(629	)		—
K Bank Inc.		66,787		(79,671	)		1,432			(78,440	)		—

Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures

Details of a reconciliation of the summarized financial information to the carrying amount of interests in the associates and joint ventures as at and for the years end December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	418,601		33.33	%	￦	139,534	￦	—	￦	139,534
KT-SB Venture Investment		5,884		50.00	%		2,942		—		2,942
KT-IBKC Future Investment Fund 1		21,649		50.00	%		10,825		—		10,825
KT-CKP New Media Investment Fund		4,620		49.67	%		2,294		—		2,294
K Bank Inc.1		233,775		10.00	%		42,108		—		42,108

1 8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

	December 31, 2018
(In millions of Korean won)	Net assets (a)		Percentage of ownership (b)			Share in net assets (c)=(a)x(b)		Intercompany transaction and others (d)		Book amount (c)+(d)
Korea Information & Technology Fund	￦	444,764		33.33	%	￦	148,255	￦	—	￦	148,255
KT-SB Venture Investment		8,940		50.00	%		4,470		—		4,470
KT-IBKC Future Investment Fund 1		19,922		50.00	%		9,961		—		9,961
KT-CKP New Media Investment Fund		565		49.70	%		280		—		280
K Bank Inc.1		280,083		10.00	%		52,655		—		52,655

1 8.8% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

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Trade and Other Payables (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Trade and Other Payables

Details of trade and other payables as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Current liabilities
Trade payables	￦	1,399,287	￦	1,236,489
Other payables		6,026,801		5,771,026
Total	￦	7,426,088	￦	7,007,515
Non-current liabilities
Trade payables	￦	4,787	￦	3,207
Other payables		996,582		1,510,657
Total	￦	1,001,369	￦	1,513,864

Summary of Other Payables

Details of other payables as at December 31, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Non-trade payables1	￦	4,775,177		￦	5,191,268
Accrued expenses		1,011,089			904,135
Operating deposits		850,999			819,968
Others		386,118			366,312
Less: non-current		(996,582	)		(1,510,657	)
Current	￦	6,026,801		￦	5,771,026

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦1,996,320 million related to credit card transactions are included as at December 31, 2018 (2017: ￦2,365,477 million).

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Borrowings (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Borrowings

Details of borrowings as at December 31, 2017 and 2018, are as follows:

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 07, 2034	6.50%		USD 100,000	￦	107,140			USD 100,000	￦	111,810
FR notes		Aug. 28, 2018	—		USD 300,000		321,420			—		—
MTNP notes		Apr. 22, 2019	2.63%		USD 350,000		374,990			USD 350,000		391,335
MTNP notes		Jan. 29, 2018	—		JPY 6,800,000		64,539			—		—
MTNP notes		Feb. 23, 2018	—		JPY 15,000,000		142,367			—		—
MTNP notes		July 18, 2026	2.50%		USD 400,000		428,560			USD 400,000		447,240
MTNP notes		Aug 07, 2022	2.63%		USD 400,000		428,560			USD 400,000		447,240
FR notes2		Aug 23, 2020	LIBOR(3M)+0.40%		—		—			USD 200,000		223,620
FR notes2		Aug 23, 2023	LIBOR(3M)+0.90%		—		—			USD 100,000		111,810
MTNP notes		July 06, 2020	0.31%		—		—			JPY 4,000,000		40,527
MTNP notes		July 06, 2021	0.38%		—		—			JPY 16,000,000		162,109
MTNP notes		Nov 13, 2020	0.30%		—		—			JPY 30,000,000		303,954
The 173-2nd Public bond		Aug. 06, 2018	—		—		100,000			—		—
The 179th Public bond		Mar. 29, 2018	—		—		260,000			—		—
The 180-2nd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
The 181-2nd Public bond		Aug. 26, 2018	—		—		90,000			—		—
The 181-3rd Public bond		Aug. 26, 2021	4.09%		—		250,000			—		250,000
The 182-2nd Public bond		Oct. 28, 2021	4.31%		—		100,000			—		100,000
The 183-2nd Public bond		Dec. 22, 2021	4.09%		—		90,000			—		90,000
The 183-3rd Public bond		Dec. 22, 2031	4.27%		—		160,000			—		160,000
The 184-1st Public bond		Apr. 10, 2018	—		—		120,000			—		—
The 184-2nd Public bond		Apr. 10, 2023	2.95%		—		190,000			—		190,000
The 184-3rd Public bond		Apr. 10, 2033	3.17%		—		100,000			—		100,000
The 185-1st Public bond		Sept. 16, 2018	—		—		200,000			—		—
The 185-2nd Public bond		Sept. 16, 2020	3.65%		—		300,000			—		300,000
The 186-2nd Public bond		June 26, 2019	3.08%		—		170,000			—		170,000
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2034	3.70%		—		100,000			—		100,000
The 187-2nd Public bond		Sept. 02, 2019	2.97%		—		220,000			—		220,000
The 187-3rd Public bond		Sept. 02, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 02, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	2.26%		—		160,000			—		160,000
The 188-2nd Public bond		Jan. 29, 2025	2.45%		—		240,000			—		240,000
The 188-3rd Public bond		Jan. 29, 2035	2.71%		—		50,000			—		50,000
The 189-1st Public bond		Jan. 28, 2019	1.76%		—		100,000			—		100,000
The 189-2nd Public bond		Jan. 28, 2021	1.95%		—		130,000			—		130,000
The 189-3rd Public bond		Jan. 28, 2026	2.20%		—		100,000			—		100,000
The 189-4th Public bond		Jan. 28, 2036	2.35%		—		70,000			—		70,000
The 190-1st Public bond		Jan. 29, 2021	2.55%		—		—			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		—			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		—			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		—			—		70,000
The 17th unsecured bond		Apr. 22, 2018	—		—		60,000			—		—
							5,987,576					6,029,645
Less: Current portion							(1,357,776	)				(880,940	)
Discount on bonds							(19,347	)				(20,056	)
Total						￦	4,610,453				￦	5,128,649

1 As at December 31, 2018, the Controlling Company has outstanding notes in the amount of USD 100 million with fixed interest rates under Medium Term Note Program (“MTNP”) registered in the Singapore Stock Exchange, which allowed issuance of notes of up to USD 2,000 million. However, the MTN Program has been suspended since 2007.

2 Libor (3M) are approximately 2.808 % as at December 31, 2018.

Summary of Short-term Borrowings

Short-term borrowings

	(In millions of Korean won)		December 31, 2017		December 31, 2018
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	3.78%	￦	—	￦	15,000
	Shinhan Bank	3.70% ~ 4.72%		113,300		59,800
	Sinhan Bank, Indonesia	8.90%		—		614
	Korea Development Bank	2.50% ~ 4.35%		12,000		16,200
	SooHyup Bank	4.57%		3,000		1,000
	Total		￦	128,300	￦	92,614

Summary of Long-term Borrowings

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2017					December 31, 2018
Financial institution	Type	Annual interest rates		Foreign currency		Korean won			Foreign currency		Korean won
Export-Import Bank of Korea	Inter-Korean Cooperation Fund1		1.50%		—	￦	4,688			—	￦	3,948
Shinhan Bank	General loans		2.93%		—		30,000			—		5,000
	Facility loans		3.01%		—		6,000			—		30,000
	Vessel facility loans2		LIBOR(3M)+0.706%		USD 15,000		16,071			USD 9,000		10,063
KEB Hana Bank	General loans		3.95%		—		3,000			—		—
Standard Charted Bank	General loans		3.16%		—		8,000			—		6,000
NongHyup Bank	General loans		2.86%		—		8,000			—		8,000
	Facility loans		2.00%		—		123			—		104
Korea Development Bank	General loans		3.02%		—		—			—		10,000
	General loans		3.30%		—		30,000			—		30,000
Kookmin Bank	Facility loans		2.59%		—		2,333			—		—
NH Investment & Security Co., Ltd.	Commercial papers		3.17%		—		300,000			—		300,000
Others	Redeemable convertible preferred stock3		1.00%		—		950			—		950
	Kookmin Bank and other2		4.59%		USD 166,108		177,968			USD 127,023		142,025
						￦	587,133				￦	546,090
	Less: Current portion					￦	(87,398	)			￦	(394,927	)
	Total					￦	499,735				￦	151,163

1 The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period.

2 LIBOR(3M) is approximately 2.808% as at December 31, 2018.

3 Skylife TV Co., Ltd., a subsidiary of the Group, issued 1,900,000 of redeemable convertible preferred stock with a par value per share of ￦500 in 2010.

Summary of Repayment of Borrowings Including the Current Liabilities

Repayment schedule of the Group’s borrowings including the portion of current liabilities as at December 31, 2018, is as follows:

(In millions of Korean won)
	Debentures						Borrowings						Total
	In local currency		In foreign currency		Sub- total		In local currency		In foreign currency		Sub- total
Jan 1, 2019 ~ Dec 31, 2019	￦	490,000	￦	391,335	￦	881,335	￦	436,518	￦	51,023	￦	487,541	￦	1,368,876
Jan 1, 2020 ~ Dec 31, 2020		460,000		568,101		1,028,101		1,468		47,054		48,522		1,076,623
Jan 1, 2021 ~ Dec 31, 2021		1,060,000		162,109		1,222,109		45,518		43,700		89,218		1,311,327
Jan 1, 2022 ~ Dec 31, 2022		—		447,240		447,240		518		10,925		11,443		458,683
After 2023		1,780,000		670,860		2,450,860		1,980		—		1,980		2,452,840
	￦	3,790,000	￦	2,239,645	￦	6,029,645	￦	486,002	￦	152,702	￦	638,704	￦	6,668,349

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Provisions (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Changes in Provisions

Changes in provisions for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	19,038		￦	101,312		￦	76,829		￦	197,179
Increase (Transfer)		3,842			2,827			41,550			48,219
Usage		(1,740	)		(2,178	)		(22,382	)		(26,300	)
Reversal		(2,834	)		(1,723	)		(11,467	)		(16,024	)
Change in scope of consolidation		—			(22	)		(22	)		(44	)
Ending balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Current		17,238			1,766			59,168			78,172
Non-current		1,068			98,450			25,340			124,858
	2018
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	18,306		￦	100,216		￦	84,508		￦	203,030
Increase (Transfer)		44,593			25,975			33,378			103,946
Usage		(3,002	)		(3,181	)		(11,780	)		(17,963	)
Reversal		(1,137	)		(4,182	)		(1,818	)		(7,137	)
Ending balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Current		14,513			1,736			101,632			117,881
Non-current		44,247			117,092			2,656			163,995

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Net Defined Benefit Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Statement [LineItems]

Summary of Amount Recognized in the Statements of Financial Position

The amounts recognized in the statements of financial position are determined as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Present value of defined benefit obligations	￦	1,911,166		￦	2,201,876
Fair value of plan assets		(1,519,779	)		(1,643,046	)
Liabilities	￦	395,079		￦	561,269
Assets in the statement of financial position	￦	3,692		￦	2,439

Summary of Changes in the Defined Benefit Obligations

Changes in the defined benefit obligations for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,713,184		￦	1,911,166
Current service cost		210,336			225,667
Interest expense		38,994			51,691
Benefit paid		(154,600	)		(121,372	)
Changes due to settlements of plan		(61	)		9,801
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		3,353			4,600
Actuarial gains and losses arising from changes in financial assumptions		36,946			116,458
Actuarial gains and losses arising from experience adjustments		63,583			(19,919	)
Changes in scope of Consolidation		(569	)		23,784
Ending	￦	1,911,166		￦	2,201,876

Changes in the fair value of plan assets for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	1,334,780		￦	1,519,779
Interest income		30,303			41,233
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(5,557	)		1,409
Benefits paid		(130,510	)		(116,303	)
Employer contributions		290,895			179,100
Changes in scope of consolidation		(132	)		17,828
Ending	￦	1,519,779		￦	1,643,046

Summary of Amounts Recognized in the Statement of Profit or Loss

Amounts recognized in the statement of profit or loss for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Current service cost	￦	205,114		￦	210,336		￦	225,667
Net Interest cost		12,141			8,691			10,458
Past service cost		424			(61	)		9,801
Transfer out		(8,737	)		(9,196	)		(13,881	)
Total expenses	￦	208,942		￦	209,770		￦	232,045

Summary of Principal Actuarial Assumptions

Principal actuarial assumptions used are as follows:

	December 31, 2016	December 31, 2017	December 31, 2018
Discount rate	2.43%	2.76%	2.77%
Future salary increase	4.10%	4.51%	4.61%

Summary of Expected Maturity Analysis of Undiscounted Pension Benefits

The expected maturity analysis of undiscounted pension benefits as at December 31, 2018, is as follows:

(In millions of Korean won)	Less than 1 year		Between 1-2 years		Between 2-5 years		Over 5 years		Total
Pension benefits	￦	183,106	￦	225,706	￦	726,283	￦	3,972,768	￦	5,107,863

Defined benefit obligations [member]

Statement [LineItems]

Summary of Sensitivity of the Defined Benefit Obligations

The sensitivity of the defined benefit obligations as at December 31, 2018, to changes in the principal assumptions is:

(In percentage, in millions of Korean won)	Effect on defined benefit obligation
	Changes in assumption	Increase in assumption			Decrease in assumption
Discount rate	0.5% point	￦	(72,851	)	￦	82,527
Salary growth rate	0.5% point		75,647			(63,267	)

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary Of Major Commitments With Local Financial Institutions

As at December 31, 2018, major commitments with local financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency		Limit		Used amount
Bank overdraft	Kookmin Bank and others		KRW		1,697,000		—
Commercial papers	NH Investment & Securities Co., Ltd.		KRW		300,000		300,000
Inter-Korean Cooperation Fund	Export-Import Bank of Korea		KRW		37,700		3,948
Collateralized loan on electronic accounts receivable-trade	Shinhan Bank and others		KRW		495,560		70,759
Plus electronic notes payable	Industrial Bank of Korea		KRW		50,000		960
Loans for working capital	Korea Development Bank and others		KRW		254,300		158,000
Facility loans	Shinhan Bank and others		KRW		10,123		8,406
	Kookmin Bank and others		USD		212,000		127,024
Facility loans on ships	Shinhan Bank		USD		9,000		9,000
Export L/C	Shinhan Bank		USD		—		1,156
Derivatives transaction limit	Korea Development Bank		KRW		100,000		64,622
FX forward trading commitment	Shinhan Bank		USD		11,500		—
Total			KRW		2,944,683		606,695
			USD		232,500		137,180

Summary of Guarantees Received from Financial Institutions

As at December 31, 2018, guarantees received from financial institutions are as follows:

(In millions of Korean won and thousands of foreign currencies)	Financial institution	Currency			Limit
Performance guarantee	Seoul Guarantee Insurance and others		KRW			299,689
			USD			1,200
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD			5,980
Guarantee for payment in Korean currency	Shinhan Bank and others		KRW			5
Guarantee for payment in foreign currency	KEB Hana and others		USD			51,766
			PLN	1		23,000
Comprehensive credit line	KEB Hana Bank and others		KRW			40,000
Comprehensive credit line	KEB Hana Bank		USD			10,000
Bid guarantee	KEB Hana Bank		USD			400
Bid guarantee			KRW			58,992
Performance guarantee /Warranty Guarantee	Korea Software Financial Cooperative and others		KRW			376,420
Guarantee for advances received/others			KRW			124,901
Bid guarantee			KRW			350
Warranty guarantee			KRW			1,037
Guarantees for licensing			KRW			4,070
Performance guarantee/Warranty Guarantee	Seoul Guarantee Insurance		KRW			996
Guarantee for public sale			KRW			120
Guarantee for deposits			KRW			3,525
Total			KRW			910,105
			USD			69,346
			PLN	1		23,000

1 Polish Zloty.

Summary Of Guarantees Provided By The Group For Third Parties

As at December 31, 2018, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won and thousands of foreign currencies)	Subject to payment guarantees	Creditor	Currency		Limit		Used amount		Period
KT Estate Inc.	Busan Gaya Centreville Buyers	Shinhan Bank		KRW		4,854		2,503		Nov 10, 2017 ~Oct. 31, 2020
KT Estate Inc.	Daegu Beomeo-Crossroads SeohanIDaum Buyers	Shinhan Bank		KRW		8,172		4,271		Oct 29, 2017 ~Nov. 30, 2020
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		KRW		538		—		Apr 19, 2018 ~Apr 19, 2019
KT Hitel Co., Ltd.	Korea Software Financial Cooperative	Yonsei University and others		KRW		34,715		1,616		Oct 22, 2018 ~Oct 22, 2021
BC Card Co., Ltd	PT BCcard Asia Pacific	Shinhan Bank, Indonesia		IDR		8,000,000		8,000,000		Sep 18, 2018 ~Sep 17, 2019

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Lease (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary Of Details Of Finance Lease Assets

Details of finance lease assets as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Acquisition costs	￦	325,975		￦	343,055
Less: Accumulated depreciation		(126,091	)		(152,244	)
Net balance	￦	199,884		￦	190,811

Summary Of Details Of Future Minimum Lease Payments Under Finance Lease Contracts

Details of future minimum lease payments as at December 31, 2017 and 2018, under finance lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Total amount of minimum lease payments
Within one year	￦	88,441	￦	77,615
From one year to five years		132,113		124,498
More than five years		81		79
		220,635		202,192
Unrealized interest expense		43,758		38,334
Net amount of minimum lease payments
Within one year		68,651		59,324
From one year to five years		108,146		104,456
More than five years		80		78
Total	￦	176,877	￦	163,858

Summary Of Details Of future Minimum Lease Payments Under Operating Lease Contracts

Details of future minimum lease payments as at December 31, 2017 and 2018, under operating lease contracts are summarized below:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Within one year	￦	109,258	￦	109,025
From one year to five years		266,434		263,395
Thereafter		1,635		1,153
Total	￦	377,327	￦	373,573

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Share Capital (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Share Capital

As at December 31, 2017 and 2018, the Group’s number of authorized shares is one billion.

December 31, 2017

December 31, 2018

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of outstanding shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Ordinary shares1

261,111,808

￦

5,000

￦

1,564,499

261,111,808

￦

5,000

￦

1,564,499

1 The Group retired 51,787,959 treasury shares against retained earnings. Therefore, the ordinary shares amount differs from the amount resulting from multiplying the number of shares issued.

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Retained Earnings (Tables)

12 Months Ended

Dec. 31, 2018

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Summary of Retained Earnings

Details of retained earnings as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017		December 31, 2018
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		4,527,539		5,822,458
Total	￦	9,961,150	￦	11,256,069

1 The Commercial Code of the Republic of Korea requires the Controlling Company to appropriate, as a legal reserve, an amount equal to a minimum of 10% of cash dividends paid until such reserve equals 50% of its issued share capital. The reserve is not available for the payment of cash dividends, but may be transferred to share capital with the approval of the Controlling Company’s Board of Directors or used to reduce accumulated deficit, if any, with the ratification of the Controlling Company’s majority shareholders.

2 The provision of research and development of human resources is separately accumulated with tax reserve fund during earned surplus disposal by Tax Reduction and Exemption Control Act of Korea. Reversal of this provision can be paid out as dividends according to related tax law.

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Accumulated Other Comprehensive Income and Other Components of Equity (Tables)

12 Months Ended

Dec. 31, 2018

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Summary of Accumulated Other Comprehensive Income

As at December 31, 2017 and 2018, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Changes in investments in associates and joint ventures	￦	(735	)	￦	(871	)
Loss on derivatives valuation		(3,463	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		—			96,704
Gain of valuation on available-for-sale		52,673			—
Exchange differences on translation for foreign operations		(17,490	)		(15,201	)
Total	￦	30,985		￦	50,158

Summary of Changes in Accumulated Other Comprehensive Income

Changes in accumulated other comprehensive income for the years ended December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Beginning			Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(10,883	)	￦	10,148		￦	—		￦	(735	)
Gain or loss on derivatives valuation		(34,309	)		(111,083	)		141,929			(3,463	)
Gain or loss of valuation on available-for-sale		54,106			54,017			(55,450	)		52,673
Exchange differences on translation for foreign operations		(10,346	)		(7,144	)		—			(17,490	)
Total	￦	(1,432	)	￦	(54,062	)	￦	86,479		￦	30,985

	2018
(In millions of Korean won)	Beginning			Changes in accounting policy		Increase/ decrease			Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(735	)	￦	—	￦	(136	)	￦	—		￦	(871	)
Gain or loss on derivatives valuation		(3,463	)		—		17,268			(44,279	)		(30,474	)
Gain on valuation of financial assets at fair value through other comprehensive income		52,673			17,741		26,290			—			96,704
Exchange differences on translation for foreign operations		(17,490	)		—		2,289			—			(15,201	)
Total	￦	30,985		￦	17,741	￦	45,711		￦	(44,279	)	￦	50,158

Summary of Other Components of Equity

The Group’s other components of equity as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Treasury stock1	￦	(853,108	)	￦	(830,874	)
Gain or loss on disposal of treasury stock2		873			(12,251	)
Share-based payments		6,483			5,956
Others3		(359,550	)		(343,914	)
Total	￦	(1,205,302	)	￦	(1,181,083	)

1 During the year ended December 31, 2018, the Group acquired treasury stock of 847,620 and disposed of 895,333 treasury shares.

2 The amount directly reflected in equity is ￦5,410 million (2017: ￦653 million) for the year ended December 31, 2018.

3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included.

Summary of Treasury Stock

As at December 31, 2017 and 2018, the details of treasury stock are as follows:

	December 31, 2017		December 31, 2018
Number of shares (in shares)		16,014,753		15,967,040
Amounts (In millions of Korean won)	￦	853,108	￦	830,874

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Share-based Payments (Tables)

12 Months Ended

Dec. 31, 2018

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Summary of Details of Share-Based Payments

Details of share-based payments as at December 31, 2018, are as follows:

	12th grant
Grant date	August 2, 2018
Grantee	CEOs, inside directors, outside directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦28,350
Total compensation costs (in Korean won)	￦5,956 million
Estimated exercise date (exercise date)	During 2019
Valuation method	Fair value method

Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price

Changes in the number of stock options and the weighted-average exercise price as at December 31, 2017 and 2018, are as follows:

	2017
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
10th grant		318,506		—		193,094		125,412		—		—
11th grant		—		316,949		—		—		316,949		—
Total		318,506		316,949		193,094		125,412		316,949		—

	2018
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
11th grant		316,949		—		312,181		4,768		—		—
12th grant		—		353,325		—		—		353,325		—
Total		316,949		353,325		312,181		4,768		353,325		—

1 The closing price of ordinary shares at the time of exercise in 2018 was ￦27,300 (2017: ￦31,797).

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Detail Explanation of Revenue in Statement of Profit or Loss

The Group has recognized the following amounts relating to revenue in the statement of profit or loss:

(In millions of Korean won)	2018
Revenue from contracts with customers	￦	23,012,257
Revenue from other sources		423,793
Total revenue	￦	23,436,050

Detail Explanation of Operating Revenue

Operating revenues for the years ended December 31, 2018, are as follows:

(In millions of Korean won)	2018
Mobile services	￦	6,827,685
Fixed-line services:		4,869,253
Fixed-line and VoIP telephone services		1,708,319
Broadband Internet access services		2,112,763
Data communication services		1,048,171
Media and content		3,182,324
Financial services		3,444,917
Sale of goods		3,288,911
Others		1,822,960
Total	￦	23,436,050

Detail Analysis of Contract with Customer Assets and Liabilities

The contract assets and liabilities recognized in relation to the revenues from contracts with customers are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract assets	￦	421,131	￦	398,797
Contract liabilities		282,836		347,461
Deferred revenue		88,732		96,198

Detail Analysis of Contract Costs Recognized as Assets

The contract costs recognized as assets are as follows:

(In millions of Korean won)	January 1, 2018		December 31, 2018
Contract costs recognized as assets	￦	1,306,409	￦	1,469,855

Detail of Revenue Arising from Carried-Forward Contract Liabilities

In 2018, the recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905
Deferred revenue of joining/installment fee		39,975
Others		1,536
Total	￦	225,416

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Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Operating Expenses

Operating expenses for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017			2018
Salaries and wages	￦	3,477,596	￦	3,568,456		￦	3,845,842
Depreciation		2,762,773		2,745,969			2,674,205
Amortization of intangible assets		582,493		618,533			607,527
Commissions		1,099,429		1,085,865			1,080,168
Interconnection charges		690,285		640,612			579,613
International interconnection fee		216,633		214,058			226,627
Purchase of inventories		3,407,263		4,053,693			4,414,094
Changes of inventories		162,323		(187,439	)		(432,607	)
Sales commission		1,968,035		2,201,778			1,942,841
Service cost		1,322,337		1,428,405			1,540,869
Utilities		323,406		323,313			323,411
Taxes and dues		255,480		279,574			285,131
Rent		455,457		448,772			460,377
Insurance premium		178,231		69,384			73,654
Installation fee		156,669		146,783			143,669
Advertising expenses		185,560		197,114			157,675
Research and development expenses		167,881		168,635			176,758
Card service cost		3,049,559		3,094,894			3,112,618
Others		1,319,688		1,379,438			1,122,718
Total	￦	21,781,098	￦	22,477,837		￦	22,335,190

Summary of Details of Employee Benefits

Details of employee benefits for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Short-term employee benefits	￦	3,206,904	￦	3,297,944	￦	3,505,214
Post-employment benefits(Defined benefit plan)		208,942		209,770		232,045
Post-employment benefits(Defined contribution plan)		46,023		45,936		48,210
Post-employment benefits(Others)		8,017		6,949		51,934
Share-based payment		7,710		7,660		8,439
Total	￦	3,477,596	￦	3,568,259	￦	3,845,842

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Financial Income and Costs (Tables)

12 Months Ended

Dec. 31, 2018

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Summary of Details of Financial Income

Details of financial income for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest income	￦	115,686	￦	93,078	￦	244,796
Gain on foreign currency transactions		24,915		79,653		17,175
Gain on foreign currency translation		12,165		225,580		3,691
Gain on settlement of derivatives		8,515		—		27,950
Gain on valuation of derivatives		109,436		57		66,305
Others		25,422		7,960		14,326
Total	￦	296,139	￦	406,328	￦	374,243

Summary of Details of Financial Costs

Details of financial costs for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016		2017		2018
Interest expenses	￦	337,219	￦	302,464	￦	296,874
Loss on foreign currency transactions		37,936		40,303		49,156
Loss on foreign currency translation		121,949		12,239		72,642
Loss on settlement of derivatives		632		58,569		—
Loss on valuation of derivatives		138		209,582		2,045
Loss on disposal of trade receivables		15,838		20,355		13,818
Impairment loss on available-for-sale financial assets		966		9		—
Others		409		1,010		1,124
Total	￦	515,087	￦	644,531	￦	435,659

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Deferred Income Tax and income Tax Expense (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities

The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2017 and 2018, is as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	318,339		￦	428,690
Deferred tax assets to be recovered after more than 12 months		1,140,252			1,347,985
Deferred tax assets before offsetting		1,458,591			1,776,675
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(15,705	)		(413,409	)
Deferred tax liability to be recovered after more than 12 months		(859,126	)		(1,102,682	)
Deferred tax liabilities before offsetting		(874,831	)		(1,516,091	)
Deferred tax assets after offsetting	￦	712,222		￦	465,369
Deferred tax liabilities after offsetting	￦	128,462		￦	204,785

Summary of Gross Movements on the Deferred Income Tax Account

The gross movements on the deferred income tax account for the years ended December 31, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2017			2018
Beginning	￦	563,729		￦	583,760
Changes in accounting policy		—			(374,307	)
Credited to the statement of profit or loss		(1,771	)		15,016
Charged to other comprehensive income		21,802			36,115
Ending	￦	583,760		￦	260,584

Summary of Movement in Deferred Income Tax Assets and Liabilities

The movement in deferred income tax assets and liabilities during the year, without taking into consideration the offsetting of balances within the same tax jurisdiction, is as follows:

(In millions of Korean won)	2017
	Beginning			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments	￦	(49,188	)	￦	49,188		￦	—		￦	—
Available-for-sale financial assets		(31,702	)		(164	)		1,346			(30,520	)
Investment in subsidiaries, associates, and joint ventures		(50,746	)		(42,659	)		(3,245	)		(96,650	)
Depreciation		(39,498	)		39,498			—			—
Advanced depreciation provision		(225,687	)		(22,905	)		—			(248,592	)
Deposits for severance benefits		(307,730	)		(80,126	)		—			(387,856	)
Accrued income		(2,024	)		(126	)		—			(2,150	)
Reserve for technology and human resource development		(747	)		433			—			(314	)
Others		(119,366	)		10,617			—			(108,749	)
Total	￦	(826,688	)	￦	(46,244	)	￦	(1,899	)	￦	(874,831	)
Deferred tax assets
Derivative instruments	￦	—		￦	34,572		￦	(9,848	)	￦	24,724
Provision for impairment or trade receivables		110,276			11,380			—			121,656
Inventory valuation		48			(48	)		—			—
Contribution for construction		18,091			180			—			18,271
Accrued expenses		80,356			10,683			—			91,039
Provisions		20,221			3,858			—			24,079
Property and equipment		232,915			(841	)		—			232,074
Defined benefit liabilities		372,492			67,751			26,806			467,049
Withholding of facilities expenses		6,910			472			—			7,382
Accrued payroll expenses		25,915			(10,786	)		—			15,129
Deduction of installment receivables		13,887			(13,887	)		—			—
Assets retirement obligation		18,086			2,750			—			20,836
Gain or loss foreign currency translation		67,701			(67,558	)		—			143
Deferred revenue		26,113			221			—			26,334
Real-estate sales		3,851			4,847			—			8,698
Tax credit carryforwards		199,599			(48,823	)		—			150,776
Tax loss carryforward		—			2,699			—			2,699
Others		193,956			47,003			6,743			247,702
Total	￦	1,390,417		￦	44,473		￦	23,701		￦	1,458,591
Net balance	￦	563,729		￦	(1,771	)	￦	21,802		￦	583,760

(In millions of Korean won)	2018
	Beginning			Changes in accounting policy			Statement of profit or loss			Other comprehensive income			Ending
Deferred tax liabilities
Available-for-sale financial assets	￦	(30,520	)	￦	30,520		￦	—		￦	—		￦	—
Investment in subsidiaries, associates, and joint ventures		(96,650	)		—			2,867			179			(93,604	)
Depreciation		—			—			(424	)		—			(424	)
Advanced depreciation provision		(248,592	)		—			(64,592	)		—			(313,184	)
Deposits for severance benefits		(387,856	)		—			(11,126	)		—			(398,982	)
Accrued income		(2,150	)		—			592			—			(1,558	)
Reserve for technology and human resource development		(314	)		—			110			—			(204	)
Prepaid expenses		—			(352,139	)		(17,777	)		—			(369,916	)
Contract assets		—			(23,663	)		12,158			—			(11,505	)
Financial assets at fair value through profit or loss		—			(30,856	)		30,195			—			(661	)
Financial assets at fair value through other comprehensive income		—			(8,587	)		(17,638	)		(15,573	)		(41,798	)
Others		(108,749	)		—			(175,506	)		—			(284,255	)
Total	￦	(874,831	)	￦	(384,725	)	￦	(241,141	)	￦	(15,394	)	￦	(1,516,091	)
Deferred tax assets
Derivative instruments	￦	24,724		￦	—		￦	(26,128	)	￦	9,745		￦	8,341
Provision for impairment or trade receivables		121,656			(9,096	)		(12,673	)		—			99,887
Inventory valuation		—			—			121			—			121
Contribution for construction		18,271			—			(1,471	)		—			16,800
Unsettled expenses		106,168			—			21,729			—			127,897
Provisions		24,079			—			12,099			—			36,178
Property and equipment		232,074			—			(1,796	)		—			230,278
Defined benefit liabilities		467,049			—			3,980			42,813			513,842
Withholding of facilities expenses		7,382			—			(773	)		—			6,609
Deduction of installment receivables		—			—			42			—			42
Assets retirement obligation		20,836			—			3,696			—			24,532
Gain or loss foreign currency translation		143			—			10,529			—			10,672
Deferred revenue		26,334			15,809			(2,502	)		—			39,641
Real-estate sales		8,698			661			12,369			—			21,728
Tax loss carryforward		2,699			—			1,364			—			4,063
Trade receivables		—			2,890			(1,293	)		—			1,597
Others		247,702			154			284,742			(1,049	)		531,549
Total	￦	1,307,815		￦	10,418		￦	304,035		￦	51,509		￦	1,673,777
Temporary difference, net		432,984			(374,307	)		62,894			36,115			157,686
Tax credit carryforwards		150,776			—			(47,878	)		—			102,898
Total net balance	￦	583,760		￦	(374,307	)	￦	15,016		￦	36,115		￦	260,584

Summary of Tax Impacts Recognized Directly To Equity

The tax impacts recognized directly to equity as at December 31, 2016, 2017, and 2018, are as follows:

	2016									2017									2018
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Loss on valuation of available-for-sale securities	￦	9,347		￦	(2,262	)	￦	7,085		￦	(5,561	)	￦	1,346		￦	(4,215	)	￦	—		￦	—		￦	—
Gain on valuation of financial assets at fair value through other comprehensive income		—			—			—			—			—			—			59,384			(15,573	)		43,811
Gain (loss) on valuation of hedge instruments		(14,611	)		3,536			(11,075	)		40,694			(9,848	)		30,846			(36,756	)		9,745			(27,011	)
Remeasurements of net defined benefit liabilities		5,558			(1,345	)		4,213			(110,768	)		26,806			(83,962	)		(116,324	)		42,813			(73,511	)
Share of gain(loss) of associates and joint ventures, and others		(641	)		155			(486	)		13,410			(3,245	)		10,165			(1,036	)		179			(857	)
Exchange differences on translation for foreign operations		(7,133	)		1,726			(5,407	)		(27,865	)		6,743			(21,122	)		3,989			(1,049	)		2,940
Total	￦	(7,480	)	￦	1,810		￦	(5,670	)	￦	(90,090	)	￦	21,802		￦	(68,288	)	￦	(90,743	)	￦	36,115		￦	(54,628	)

Summary of Details of Income Tax Expense

Details of income tax expense for the years ended December 31, 2016, 2017 and 2018, are calculated as follows:

(In millions of Korean won)	2016		2017		2018
Current income tax expense	￦	182,088	￦	268,885	￦	329,581
Impact of change in deferred taxes		152,102		1,771		(15,016	)
Income tax expense	￦	334,910	￦	270,656	￦	314,565

Summary of Tax on the Group's Profit Before Tax

The tax on the Group’s profit before tax differs from the theoretical amount that would arise using the weighted average tax rate applicable to profits of the entities as follows:

(In millions of Korean won)	2016			2017			2018
Profit before income tax expense	￦	1,166,755		￦	816,997		￦	1,033,977
Statutory income tax expense	￦	282,355		￦	197,251		￦	273,982
Tax effect
Income not taxable for taxation purposes		(28,093	)		(19,268	)		(85,322	)
Non-deductible expenses		21,947			39,746			18,126
Tax credit		(13,764	)		(27,211	)		(20,319	)
Additional payment of income taxes		(4,780	)		976			11,439
Tax effect and adjustment on consolidation
Goodwill impairment		31,847			20,475			137
Eliminated dividend income form subsidiaries		40,087			34,305			31,966
Changes of out-side tax effect		(567	)		17,990			618
Investment in-kind		—			—			82,820
Others		5,878			6,392			1,118
Income tax expense	￦	334,910		￦	270,656		￦	314,565

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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Basic and Diluted Earnings per Share From Operations

Basic earnings per share from operations for the years ended December 31, 2016, 2017 and 2018, is calculated as follows:

	2016		2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090	￦	461,559	￦	645,571
Weighted average number of ordinary shares outstanding (In number of shares)		244,892,313		245,017,175		245,049,466
Basic earnings per share  (In Korean won)		3,043		1,884		2,634

Diluted earnings per share from operations for the years ended December 31, 2016, 2017 and 2018 is calculated as follows:

	2016			2017		2018
Profit attributable to ordinary shares (In millions of Korean won)	￦	745,090		￦	461,559	￦	645,571
Adjusted net income attributable to ordinary shares (In millions of Korean won)		(67	)		—		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		745,023			461,559		645,571
Number of dilutive potential ordinary shares outstanding (In number of shares)		84,245			79,880		1,163
Weighted average number of ordinary shares outstanding (In number of shares)		244,976,558			245,097,055		245,050,629
Diluted earnings per share  (In Korean won)		3,041			1,883		2,634

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Cash Generated from Operations (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Cash Flows from Operating Activities

Cash flows from operating activities for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
1. Profit for the year	￦	831,845		￦	546,341		￦	719,412
2. Adjustments to reconcile net income
Income tax expense		334,910			270,656			314,565
Interest income1		(130,066	)		(108,639	)		(265,817	)
Interest expense1		337,219			302,464			296,894
Dividends income		(3,926	)		(4,785	)		(2,910	)
Depreciation		2,821,779			2,802,531			2,735,413
Amortization of intangible assets		599,721			635,150			629,526
Provision for severance benefits		217,255			218,966			245,926
Impairment losses on trade receivables		92,711			45,704			113,064
Share of net profit or loss of associates and joint ventures		(2,547	)		15,480			5,912
Loss(gain) on disposal of associates and joint ventures		(1,450	)		979			(3,737	)
Impairment loss of associates and joint ventures		17,128			3,662			—
Loss on disposal of property and equipment and investment in properties		74,913			150,293			68,688
Loss(gain) on disposal of intangible assets		7,703			4,271			(4,256	)
Loss on impairment of intangible assets		135,264			116,095			12,997

(In millions of Korean won)	2016			2017			2018
Loss on foreign currency translation		109,784			(213,341	)		68,952
Loss(gain) on valuation and settlement of derivatives, net		(117,181	)		268,094			(92,210	)
Gain on disposal of financial assets at fair value through profit or loss		—			—			(1,712	)
Gain on valuation of financial assets at fair value through profit or loss		—			—			(10,768	)
Gain on disposal of financial assets at amortized cost		—			—			(44	)
Impairment losses on available-for-sale financial assets		966			9			—
Gain on disposal of available-for-sale financial assets		(22,695	)		(89,598	)		—
Others		64,863			(251,193	)		(55,969	)
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		216,818			(303,340	)		(81,217	)
Decrease(increase) in other receivables		(779,803	)		(346,013	)		356,643
Decrease(increase) in other current assets		48,549			11,792			(123,258	)
Decrease(increase) in other non-current assets		(51,765	)		(43,790	)		19,556
Decrease(increase) in inventories		167,873			(205,403	)		(480,543	)
Increase(decrease) in trade payables		(114,838	)		162,110			(167,841	)
Increase(decrease) in other payables		706,771			214,689			(448,301	)
Increase in other current liabilities		37,798			288,553			291,548
Increase in other non-current liabilities		30,762			174,618			144,072
Decrease(Increase) in provisions		(12,583	)		(12,574	)		85,946
Decrease(Increase) in deferred revenue		(69,179	)		(13,086	)		48,201
Increase in plan assets		(224,244	)		(203,420	)		(53,301	)
Payment of severance benefits		(121,835	)		(118,391	)		(153,209	)
4. Cash generated from operations (1+2+3)	￦	5,202,520		￦	4,318,884		￦	4,212,222

1 BC Card Co., Ltd. and other subsidiaries of the Group recognized interest income and expenses as operating income and expenses, respectively. Related interest income recognized as operating revenue is ￦21,021 million (2017: ￦15,561 million) and related interest expense recognized as operating expense is ￦21 million (2017: zero) for the year ended December 31, 2018.

Summary of Significant Transactions not Affecting Cash Flows

Significant transactions not affecting cash flows for the years ended December 31, 2016, 2017 and 2018, are as follows:

(In millions of Korean won)	2016			2017			2018
Reclassification of the current portion of borrowings	￦	1,617,175		￦	1,416,066		￦	1,149,599
Reclassification of construction-in-progress to property and equipment		2,212,324			2,686,591			1,988,014
Reclassification of accounts payable from property and equipment		91,407			225,601			122,185
Reclassification of accounts payable from intangible assets		668,564			(227,108	)		584,595
Reclassification of payable from defined benefit liability		5,746			36,209			(31,838	)
Reclassification of payable from plan assets		(9,731	)		43,035			(9,497	)

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Changes in Liabilities Arising from Financing Activities (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Changes in Liabilities Arising from Financial Activities

Changes in liabilities arising from financial activities for the periods ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	8,120,791		￦	(1,163,917	)	￦	—	￦	(221,495	)	￦	—		￦	(2,206	)	￦	(49,511	)	￦	6,683,662
Financial lease liabilities		180,714			(71,735	)		68,938		—			—			—			(1,039	)		176,878
Derivative liabilities		16,901			—			—		130,674			(28,015	)		—			(20,740	)		98,820
Derivative assets		(227,318	)		71,370			—		76,552			(2,687	)		—			74,694			(7,389	)
Total	￦	8,091,088		￦	(1,164,282	)	￦	68,938	￦	(14,269	)	￦	(30,702	)	￦	(2,206	)	￦	3,404		￦	6,951,971
(In millions of Korean won)	2018
	Beginning			Cash flows			Non-cash														Ending
							Newly acquired		Exchange difference			Fair value change			Scope changes			Others
Borrowing	￦	6,683,662		￦	(139,715	)	￦	—	￦	70,095		￦	—		￦	15,000		￦	19,252		￦	6,648,294
Financial lease liabilities		176,878			(73,885	)		61,187		—			—			—			(322	)		163,858
Derivative liabilities		98,820			(14,587	)		—		(37,344	)		35,809			—			(17,631	)		65,067
Derivative assets		(7,389	)		11,126			—		(22,474	)		(3,419	)		—			(7,687	)		(29,843	)
Total	￦	6,951,971		￦	(217,061	)	￦	61,187	￦	10,277		￦	32,390		￦	15,000		￦	(6,388	)	￦	6,847,376

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Segment Information

Details of each segment for the years ended December 31, 2016, 2017 and 2018, are as follows:

	2016
(In millions of Korean won)	Operating revenues			Operating income			Depreciation and Amortization
Marketing/Customer	￦	16,187,739		￦	1,093,377		￦	2,870,161
Finance		3,577,549			208,566			28,868
Satellite TV		668,945			79,987			98,895
Others		6,308,203			40,047			339,429
		26,742,436			1,421,977			3,337,353
Elimination		(3,578,234	)		(38,873	)		7,913
Consolidated amount	￦	23,164,202		￦	1,383,104		￦	3,345,266

	2017
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	16,242,552		￦	1,018,593		￦	2,895,930
Finance		3,637,917			205,678			28,827
Satellite TV		685,822			75,373			99,216
Others		6,651,552			(187,090	)		332,153
		27,217,843			1,112,554			3,356,126
Elimination		(3,670,914	)		(43,462	)		8,376
Consolidated amount	￦	23,546,929		￦	1,069,092		￦	3,364,502

	2018
(In millions of Korean won)	Operating revenues			Operating Income (loss)			Depreciation and Amortization
Marketing/Customer	￦	14,061,629		￦	886,515		￦	2,293,809
Corporate customer business1		2,509,880			208,584			546,635
Finance		3,560,417			145,463			22,504
Satellite TV		690,821			66,735			98,310
Others		6,349,546			(154,130	)		313,511
		27,172,293			1,153,167			3,274,769
Elimination		(3,736,243	)		(52,307	)		6,963
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 The reporting segment of the current period has changed. However, the reporting segment of the prior period has not been restated to reflect the change.

Summary of Operating Revenues and Non Current Assets by Geographical Regions

Operating revenues for the year ended December 31, 2016, 2017 and 2018 and non-current assets as at December 31, 2017 and 2018 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues			Non-current assets1
Location	2016	2017	2018	2017.12.31	2018.12.31
Domestic	￦23,069,579	￦23,481,703	￦23,376,218	￦17,246,640	￦17,426,879
Overseas	94,623	65,226	59,832	137,914	139,585
Total	￦23,164,202	￦23,546,929	￦23,436,050	￦17,384,554	￦17,566,464

1 Non-current assets include property, plant and equipment, intangible assets and investment properties.

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Related Parties Outstanding Balances of Receivables and Payables

Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2017 and 2018, are as follows:

		December 31, 2017
		Receivables						Payables
(In millions of Korean won)		Trade receivables		Loans		Other receivables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	778	￦	—	￦	33,800	￦	—
	MOS GS Co., Ltd.		17		—		—		392
	MOS Daegu Co., Ltd.		1		—		—		1,388
	MOS Chungcheong Co., Ltd.		1		—		290		1,827
	MOS Gangnam Co., Ltd.		6		—		1		287
	MOS GB Co., Ltd.		17		—		1		778
	MOS BS Co., Ltd.		34		—		1		46
	MOS Honam Co., Ltd.		2		—		1		384
	K Bank, Inc.		1,338		—		7,994		296
	NgeneBio		1		2,510		—		3
	Others		54		—		1,281		2,135
	Total	￦	2,249	￦	2,510	￦	43,369	￦	7,536

		December 31, 2018
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Trade payables		Other payables
Associates and joint ventures	K-REALTY CR REITs No.1	￦	674	￦	30,910	￦	—	￦	—
	K Bank, Inc.		627		12,435		—		296
	Others		777		1,225		4		1,116
	Total	￦	2,078	￦	44,570	￦	4	￦	1,412

Summary of Significant Transactions With Related Parties

Significant transactions with related parties for the years ended December 31, 2016, 2017 and 2018, are as follows:

		2016
(In millions of Korean won)		Sales		Purchases2
Associates and joint ventures	KT Wibro Infra Co., Ltd.	￦	11	￦	391
	Smart Channel Co., Ltd.1		766		—
	K- Realty CR-REITs No.1		1,989		37,469
	MOS GS Co., Ltd.		663		17,361
	MOS Daegu Co., Ltd.		291		12,220
	MOS Chungcheong Co., Ltd.		408		13,469
	MOS Gangnam Co., Ltd.		412		15,797
	MOS GB Co., Ltd.		891		21,802
	MOS BS Co., Ltd.		441		15,346
	MOS Honam Co., Ltd.		418		14,389
	Others		1,719		29,422
	Total	￦	8,009	￦	177,666

1 The transactions for the year ended December 31, 2016, before Smart Channel Co., Ltd. was included in the consolidation scope.

2 Amounts include acquisition of primarily property and equipment.

		2017
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,233	￦	35,532
	MOS GS Co., Ltd.		704		16,946
	MOS Daegu Co., Ltd.		335		8,514
	MOS Chungcheong Co., Ltd.		455		15,542
	MOS Gangnam Co., Ltd.		484		16,380
	MOS GB Co., Ltd.		987		21,651
	MOS BS Co., Ltd.		460		15,957
	MOS Honam Co., Ltd.		493		14,294
	K Bank, Inc.		29,939		59
	NgeneBio2		43		—
	Others		1,149		11,384
	Total	￦	37,282	￦	156,259

1 The amount includes acquisition of primarily property and equipment.

2 It is the amount after excluded from consolidation during the year.

		2018
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,088	￦	31,984
	MOS GS Co., Ltd.2		493		12,023
	MOS Daegu Co., Ltd.2		229		8,775
	MOS Chungcheong Co., Ltd.2		540		9,159
	MOS Gangnam Co., Ltd.2		333		11,549
	MOS GB Co., Ltd.2		1,378		16,519
	MOS BS Co., Ltd.2		324		11,193
	MOS Honam Co., Ltd.2		331		10,499
	K Bank, Inc.		15,705		7,004
	NgeneBio3		3		—
	Others		2,888		9,547
	Total	￦	24,312	￦	128,252

1 Amounts include acquisition of primarily property and equipment.

2 It is the amount before excluded from consolidation during the year.

3 It is the amount before excluded from associates during the year

Summary of Key Management Compensation

Key management compensation for the years ended December 31, 2016, 2017 and 2018, consists of:

(In millions of Korean won)	2016		2017		2018
Salaries and other short-term benefits	￦	2,629	￦	2,879	￦	2,762
Post-employment benefits		381		311		751
Stock-based compensation		1,237		1,331		878
Total	￦	4,247	￦	4,521	￦	4,391

Summary of Fund Transactions With Related Parties

Fund transactions with related parties for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017
	Equity contributions in cash		Dividend income
Associates and joint ventures
PT. Mitra Transaksi Indonesia	￦	5,194	￦	—
KT-IBKC future investment fund 1		7,500		—
CHAMP IT Co., Ltd.		750		—
Korea Electronic Vehicle Charging Service		864		—
Gyeonggi-KT Yoojin Superman Fund		1,000		—
K-REALTY CR REIT 1		—		5,392
K Bank, Inc.		26,543		—
Korea Information & Technology Investment Fund		—		739
MOS GS Co., Ltd.		—		12
MOS Daegu Co., Ltd.		—		12
MOS Chungcheong Co., Ltd.		—		12
MOS Gangnam Co., Ltd.		—		10
MOS GB Co., Ltd.		—		15
MOS BS Co., Ltd.		—		10
MOS Honam Co., Ltd.		—		10
Total	￦	41,851	￦	6,212

(In millions of Korean won)	2018
	Equity contributions in cash and others			Dividend income
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000		￦	—
KT-CKP New Media Investment Fund		(1,229	)		—
PT. Mitra Transaksi Indonesia1		1,567			—
Gyeonggi-KT Yoojin Superman Fund		1,000			—
KT-DSC creative economy youth start-up investment fund		(1,800	)		—
KT-IBKC future investment fund 1		(1,050	)		—
Korea Electronic Vehicle Charging Service		168			—
K Bank, Inc.		26,725			—
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company		(3,423	)		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		3,960			202
K-REALTY CR REIT 1		—			8,932
Korea Information & Technology Investment Fund		—			1,842
MOS GS Co., Ltd.2		(147	)		8
MOS Daegu Co., Ltd.2		(147	)		8
MOS Chungcheong Co., Ltd.2		(153	)		8
MOS Gangnam Co., Ltd.2		(180	)		10
MOS GB Co., Ltd.2		(203	)		12
MOS BS Co., Ltd.2		(183	)		10
MOS Honam Co., Ltd.2		(206	)		10
Daiwon Broadcasting Co., Ltd.		—			85
Boston Global Film & Contents Fund L.P.		(986	)		—
Gyeonggi-KT Green Growth Fund		—			19
Total	￦	24,713		￦	11,146

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

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Financial Risk Management (Tables)

12 Months Ended

Dec. 31, 2018

Statement [LineItems]

Summary of Maximum Exposure to Credit Risk

As at December 31, 2017 and 2018, maximum exposure to credit risk is as follows.

(In millions of Korean won)	December 31, 2017		December 31, 2018
Cash and cash equivalents (except for cash on hand)	￦	1,926,620	￦	2,284,885
Trade and other receivables
Financial assets at amortized costs		6,793,397		5,425,996
Financial assets at fair value through other comprehensive income		—		1,097,348
Contract assets		—		398,797
Other financial assets
Derivatives financial assets for hedging		7,389		29,843
Financial assets at fair value through profit or loss		5,813		714,653
Financial assets at fair value through other comprehensive income		—		6,909
Financial assets at amortized costs		—		484,271
Available-for-sale financial assets		9,899		—
Held-to-maturity financial assets		151		—
Financial instruments and others		1,333,317		—
Financial guarantee contracts1		143,969		65,760
Total	￦	10,220,555	￦	10,508,462

1 It is total amount guaranteed by the Group according to the guarantee contracts.

Summary of Contractual Undiscounted Cash Flows

The table below analyzes the Group’s liabilities (including interest expenses) into relevant maturity groups based on the remaining period at the date of the end of each reporting period to the contractual maturity date. These amounts are contractual undiscounted cash flows and can differ from the amount in the financial statements.

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,882,861	￦	1,219,835	￦	161,497	￦	9,264,193
Borrowings(including debentures)		1,623,996		3,666,726		2,317,209		7,607,931
Other non-derivative financial liabilities		4,117		31,290		142,706		178,113
Financial guarantee contracts1		26,738		—		—		26,738
Total	￦	9,537,712	￦	4,917,851	￦	2,621,412	￦	17,076,975

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	7,287,436	￦	1,173,579	￦	492,429	￦	8,953,444
Borrowings(including debentures)		1,507,232		3,669,060		2,378,272		7,554,564
Other non-derivative financial liabilities		6,123		37,358		132,152		175,633
Financial guarantee contracts1		52,734		13,026		—		65,760
Total	￦	8,853,525	￦	4,893,023	￦	3,002,853	￦	16,749,401

1 It is total amount guaranteed by the Group according to guarantee contracts. Cash flow from financial guarantee contracts is classified as the maturity group in the earliest period when the financial guarantee contracts can be executed.

Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow

	December 31, 2016
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	1,174,147	￦	1,176,715	￦	536,005	￦	2,886,867
Inflow		1,302,112		1,306,199		588,559		3,196,870

	December 31, 2017
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	638,171	￦	546,791	￦	526,633	￦	1,711,595
Inflow		608,270		568,976		509,558		1,686,804

	December 31, 2018
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	455,343	￦	1,466,915	￦	517,301	￦	2,439,559
Inflow		484,505		1,492,718		519,133		2,496,356

Summary of Debt-to-equity Ratios

The debt-to-equity ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017			December 31, 2018
Total liabilities	￦	16,712,367		￦	17,815,630
Total equity		13,183,354			14,658,490
Debt-to-equity ratio		127	%		122	%

Summary of Gearing Ratios

The gearing ratios as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won, %)	December 31, 2017			December 31, 2018
Total borrowings	￦	6,860,539		￦	6,648,293
Less: cash and cash equivalents		(1,928,182	)		(2,703,422	)
Net debt		4,932,357			3,944,871
Total equity		13,183,354			14,658,490
Total capital		18,115,711			18,603,361
Gearing ratio		27	%		21	%

Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements

Details of the Group’s recognized financial assets subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedge1	￦	3,284	￦	—		￦	3,284	￦	(3,284	)	￦	—	￦	—
Trade receivables2		85,755		(5,010	)		80,745		(73,109	)		—		7,636
Other financial assets		8,680		(436	)		8,244		(5,307	)		—		2,937
	￦	97,719	￦	(5,446	)	￦	92,273	￦	(81,700	)	￦	—	￦	10,573

(In millions of Korean won)	December 31, 2018
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables2	￦	78,833	￦	(1	)	￦	78,832	￦	(76,414	)	￦	—	￦	2,418
Other financial assets		19,825		—			19,825		(19,825	)		—		—
	￦	98,658	￦	(1	)	￦	98,657	￦	(96,239	)	￦	—	￦	2,418

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies

Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements

The Group’s recognized financial liabilities subject to enforceable master netting arrangements or similar agreements are as follows:

(In millions of Korean won)	December 31, 2017
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Derivative used for hedging1	￦	26,135	￦	—		￦	26,135	￦	(3,284	)	￦	—	￦	22,851
Trade payables2		80,829		(5,217	)		75,612		(73,109	)		—		2,503
Other financial liabilities		5,549		(229	)		5,320		(5,307	)		—		13
	￦	112,513	￦	(5,446	)	￦	107,067	￦	(81,700	)	￦	—	￦	25,367

(In millions of Korean won)	December 31, 2018
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables2	￦	78,317	￦	—		￦	78,317	￦	(76,413	)	￦	—	￦	1,904
Other financial liabilities		19,827		(1	)		19,826		(19,825	)		—		1
	￦	98,144	￦	(1	)	￦	98,143	￦	(96,238	)	￦	—	￦	1,905

1 It is the amount applied with master netting arrangements under the standard contract of International Swap and Derivatives Association (ISDA).

2 It is the amount for the Controlling Company and KT Powertel Co., Ltd, a subsidiary of the Group, applied with netting arrangements under the reference offer of the telecommunication facility interconnection and sharing data among telecommunications companies.

Currency risk [Member]

Statement [LineItems]

Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity

As at December 31, 2016, 2017 and 2018, if the foreign exchange rate had strengthened/weakened by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of foreign exchange rate			Income before tax1			Shareholders’ equity
2016.12.31		10	%		(28,134	)		(23,817	)
		-10	%		28,134			23,817
2017.12.31		10	%		(10,132	)		(7,273	)
		-10	%		10,132			7,273
2018.12.31		10	%		(2,350	)		633
		-10	%		(2,851	)		(62	)

1 Computed with considering derivatives hedging effect applied by the Group to hedge foreign exchange risk of liabilities in foreign currencies

Summary of Details of Financial Assets and Liabilities in Foreign Currencies

Details of financial assets and liabilities in foreign currencies as at December 31, 2016, 2017 and 2018, are as follows:

(In thousands of foreign currencies)	2016				2017				2018
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		210,474		2,536,090		236,476		1,908,831		279,327		1,893,782
SDR1		311		737		306		738		267		730
JPY		80,555		21,802,051		28,267		21,801,443		66,078		50,000,000
GBP		1		151		—		74		—		256
EUR		40		2,571		186		3,625		2		6
DZD2		471		—		47		—		618		—
CNY		15,262		381		46,555		10		16,315		271
UZS3		39,531		—		136,787		—		121,053		—
RWF4		1,203		—		3,346		—		857		—
THB5		—		—		—		—		1,685		1,685
IDR6		15,646,011		53,142,167		14,886,393		710,162		64,240,286		41,510,330
MMK7		2,750		—		84		—		84		—
TZS8		29,987		—		317,348		—		—		2,876
BWP9		15		—		42		—		897		—
HKD		254		—		—		—		—		—
BDT10		69,473		—		38,074		—		39,494		—
PLN11		106,025		—		338		—		26		—
VND12		515,412		—		311,649		—		467,272		—
XAF13		—		—		—		—		666		—
CHF14		—		—		—		12		—		—

1 Special Drawing Rights.

2 Algeria Dinar.

3 Uzbekistan Sum.

4 Rwanda Franc.

5 Thailand Bhat.

6 Indonesia Rupiah.

7 Myanmar Kyat.

8 Tanzanian Shilling.

9 Botswana Pula.

10 Bangladesh Taka.

11 Polish Zloty.

12 Vietnam Dong.

13 Central African Franc.

14 Confoederatio Helvetia Franc.

Equity price risk [Member]

Statement [LineItems]

Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity

As at December 31, 2016, 2017 and 2018, the Group is exposed to equity securities price risk because the securities held by the Group are traded in active markets. If the market prices had increased/decreased by 10% with all other variables held constant, the effects on profit before income tax and shareholders’ equity would have been as follows:

(In millions of Korean won)	Fluctuation of price	Income before tax			Equity
2016.12.31	10%	￦	—		￦	539
	-10%		—			(539	)
2017.12.31	10%	￦	—		￦	686
	-10%		—			(686	)
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)

Interest rate risk [Member]

Statement [LineItems]

Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity

As at December 31, 2016, 2017 and 2018, if the market interest rate had increased/decreased by 100 bp with other variables held constant, the effects on profit before income tax and shareholders’ equity would be as follows:

(In millions of Korean won)	Fluctuation of interest rate	Income before tax			Shareholders’ equity
2016.12.31	+ 100 bp	￦	(3,456	)	￦	(1,673	)
	- 100 bp		3,445			(5,025	)
2017.12.31	+ 100 bp	￦	1,942		￦	4,868
	- 100 bp		(1,954	)		(5,198	)
2018.12.31	+ 100 bp	￦	1,059		￦	9,689
	- 100 bp		(1,958	)		(10,237	)

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Fair Value (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Carrying Amount and Fair Value of Financial Instruments by Category

Carrying amount and fair value of financial instruments by category as at December 31, 2017 and 2018, are as follows:

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	1,928,182		1	￦	2,703,422		1
Trade and other receivables
Financial assets measured at amortized cost		6,793,397		1		5,425,996		1
Financial assets at fair value through other comprehensive income		—		—		1,097,348		1,097,348
Other financial assets
Financial assets measured at amortized cost2		1,333,368		1		484,271		1
Financial assets at fair value through profit or loss2		5,913		5,913		777,685		777,685
Financial assets at fair value through other comprehensive income2		—		—		326,157		326,157
Available-for-sale financial assets3		319,402		319,402		—		—
Derivative financial assets for hedging		7,389		7,389		29,843		29,843
Total	￦	10,387,651			￦	10,844,722
Financial liabilities
Trade and other payables	￦	8,427,457		1	￦	8,521,379		1
Borrowings		6,683,662		6,738,326		6,648,293		1
Other financial liabilities
Financial liabilities at amortized cost		87,670		1		99,330		1

	December 31, 2017				December 31, 2018
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial liabilities at fair value through profit or loss		5,051		5,051		7,758		7,758
Derivative financial liabilities for hedging		93,770		93,770		57,308		57,308
Total	￦	15,297,610			￦	15,334,068

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value.

2 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets and financial assets held-to-maturity.

3 As at December 31, 2017, equity instruments that do not have a quoted price in an active market are measured at cost because their fair value cannot be measured reliably and excluded from the fair value disclosures.

Summary of Fair Value Hierarchy Classifications of Financial Assets and Financial Liabilities That are Measured at Fair Value

Fair value hierarchy classifications of the financial assets and financial liabilities that are measured at fair value or its fair value is disclosed as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Recurring fair value measurements
Other financial assets
Financial assets at fair value through profit or loss	￦	—	￦	—	￦	5,813	￦	5,813
Derivative financial assets for hedging		—		7,389		—		7,389
Available-for-sale financial assets		6,859		5,466		307,077		319,402
Disclosed fair value
Investment properties1		—		—		1,755,600		1,755,600
Total	￦	6,859	￦	12,855	￦	2,068,490	￦	2,088,204
Liabilities
Recurring fair value measurements
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	5,051	￦	5,051
Derivative financial liabilities for hedging		—		76,045		17,725		93,770
Total	￦	—	￦	76,045	￦	22,776	￦	98,821

1 The highest and best use of a non-financial asset does not differ from its current use.

Summary of Fair Value Non of Financial Instruments

	December 31, 2018
(In millions of Korean won)	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,097,348	￦	—	￦	1,097,348
Other financial assets
Financial assets at fair value through profit or loss1		121		613,964		163,600		777,685
Financial assets at fair value through other comprehensive income1		8,861		5,760		311,536		326,157
Derivative financial assets for hedging		—		29,843		—		29,843
Disclosed fair value
Investment properties2		—		—		1,821,061		1,821,061
Total	￦	8,982	￦	1,746,915	￦	2,296,197	￦	4,052,094
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	—	￦	7,758	￦	7,758
Derivative financial liabilities for hedging		—		47,125		10,183		57,308
Total	￦	—	￦	47,125	￦	17,941	￦	65,066

1 In the prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

2 The highest and best use of a non-financial asset does not differ from its current use.

Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements

(b) Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2017 and 2018, are as follows:

	2017
(In millions of Korean won)	Financial assets at fair value through profit or loss			Available-for-sale			Other derivative financial liabilities		Derivative financial liabilities for hedging
Beginning balance	￦	6,277		￦	287,889		￦	1,973	￦	—
Reclassification		—			(277	)		—		—
Amount recognized in other comprehensive income		—			58,450			—		(1,909	)
Purchases		—			85,287			—		—
Amount recognized in profit or loss		(464	)		(113	)		3,078		19,634
Sales		—			(124,159	)		—		—
Ending balance	￦	5,813		￦	307,077		￦	5,051	￦	17,725

	2018
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss3			Financial assets at fair value through other comprehensive income3			Financial liabilities at fair value through profit or loss2		Derivative financial liabilities for hedging1
Beginning balance	￦	97,547		￦	238,517		￦	5,051	￦	17,725
Changes in accounting policy		32,745			2,085			—		—
Purchases		21,365			8,802			—		—
Reclassification		1,581			(296	)		—		—
Changes in scope of consolidation		—			364			—		—
Sales		(1,852	)		(1,099	)		—		—
Amount recognized in profit or loss1,2		12,214			89			2,707		(17,255	)
Amount recognized in other comprehensive income1		—			63,074			—		9,713
Ending balance	￦	163,600		￦	311,536		￦	7,758	￦	10,183

1 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of both gain on valuation of derivatives and accumulated other comprehensive loss.

2 Amount recognized in profit or loss of derivative financial liabilities for hedging are comprised of loss on valuation of derivatives.

3 In prior year, a portion of the equity instrument was classified as available-for-sale financial assets.

Summary of Valuation Techniques and Inputs

Valuation techniques and inputs used in the recurring, non-recurring fair value measurements and disclosed fair values categorized within Level 2 and Level 3 of the fair value hierarchy as at December 31, 2017 and 2018, are as follows:

	December 31, 2017
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Other financial assets
Derivative financial assets for hedging	￦	7,389		2	DCF Model
Available-for-sale financial assets		312,543		2,3	DCF Model
Financial assets at fair value through profit or loss		5,813		3	DCF Model
Investment properties		1,755,600		3	DCF Model
Liabilities
Other financial liabilities
Derivative financial liabilities for hedging	￦	93,770		2,3	Hull-White model, DCF Model
Other derivative financial liabilities		5,051		3	DCF Model, Comparable Company Analysis

	December 31, 2018
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,097,348		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		777,564		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		317,296		2,3	DCF Model
Derivative financial assets for hedging		29,843		2	DCF Model
Investment properties		1,821,061		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	7,758		3	DCF Model, Comparable Company Analysis
Derivative financial liabilities for hedging		57,308		2,3	Hull-White model, DCF Model

Summary of Details and Changes of Total Deferred Difference

In relation to this, details and changes of the total deferred difference for the years ended December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	2017						2018
	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	—		￦	(8,470	)	￦	6,532		￦	(5,647	)
II. New transactions		7,126			—			—			—
III. Recognized at fair value through profit or loss		(594	)		2,823			(1,425	)		2,823
IV. Ending balance (I+II+III)	￦	6,532		￦	(5,647	)	￦	5,107		￦	(2,824	)

XML

Interests in Unconsolidated Structured Entities (Tables)

12 Months Ended

Dec. 31, 2018

Investments accounted for using equity method [abstract]

Summary of Unconsolidated Structured Entities and Nature of Risks

Details of scale of unconsolidated structured entities and nature of the risks associated with an entity’s interests in unconsolidated structured entities as at December 31, 2017 and 2018, are as follows:

(In millions of Korean won)	December 31, 2017
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,426,620	￦	3,779,377	￦	2,619,445	￦	7,825,442
Assets recognized in statement of financial position
Other financial assets	￦	21,800	￦	52,666	￦	—	￦	74,466
Joint ventures and associates		10,168		164,030		—		174,198
Total	￦	31,968	￦	216,696	￦	—	￦	248,664
Maximum loss exposure1
Investment assets	￦	31,968	￦	216,696	￦	—	￦	248,664
Total	￦	31,968	￦	216,696	￦	—	￦	248,664

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

(In millions of Korean won)	December 31, 2018
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,429,910	￦	3,701,718	￦	2,751,208	￦	7,882,836
Assets recognized in statement of financial position
Other financial assets	￦	24,421	￦	94,075	￦	—	￦	118,496
Joint ventures and associates		7,293		166,159		—		173,452
Total	￦	31,714	￦	260,234	￦	—	￦	291,948
Maximum loss exposure1
Investment assets	￦	31,714	￦	260,234	￦	—	￦	291,948
Total	￦	31,714	￦	260,234	￦	—	￦	291,948

1 It includes the investments recognized in the Group’s financial statements and the amounts which are probable to be determined when certain conditions are met by agreements including purchase agreements, credit granting and others.

XML

Information About Non-controlling Interests (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Changes in Accumulated Non-controlling Interests

Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2016, 2017 and 2018 are as follows:

(In millions of Korean won)	December 31, 2016
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	316,880	￦	22,445	￦	(8,279	)	￦	(1,370	)	￦	329,676
BC Card Co., Ltd.		30.46	%		322,921		47,068		(44,637	)		3,986			329,338
KT Powertel Co., Ltd.		55.15	%		50,926		112		—			713			51,751
KT Hitel Co., Ltd.		35.27	%		50,689		1,274		—			(165	)		51,798
KT Telecop Co., Ltd.		13.18	%		103,428		19		—			85			103,532

(In millions of Korean won)	December 31, 2017
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests		Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	329,676	￦	9,395	￦	(9,817	)	￦	(952	)	￦	328,302
BC Card Co., Ltd.		30.46	%		329,338		43,961		(29,490	)		(4,742	)		339,067
KT Powertel Co., Ltd.		55.15	%		51,751		1,165		—			137			53,053
KT Hitel Co., Ltd.		32.87	%		51,798		870		—			478			53,146
KT Telecop Co., Ltd.		13.18	%		103,532		381		—			(445	)		103,468

(In millions of Korean won)	December 31, 2018
	Non- controlling Interests rate (%)			Accumulated non-controlling interests at the beginning of the year		Profit or loss allocated to non-controlling interests			Dividend paid to non- controlling interests			Others			Accumulated non-controlling interests at the end of the year
KT Skylife Co., Ltd.		49.73	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.46	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.15	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co., Ltd.		32.87	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.18	%		103,468		59			—			(170	)		103,357

Summary of Financial Information on Subsidiaries

Summarized consolidated statements of financial position as at December 31, 2016, 2017 and 2018, are as follows:

	December 31, 2016
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		35.27	%		13.18	%
Current assets	￦	352,980		￦	2,945,584		￦	69,046		￦	158,210		￦	63,802
Non-current assets		424,968			705,480			44,679			90,992			201,751
Current liabilities		151,329			2,530,832			17,910			45,277			53,903
Non-current liabilities		80,123			71,571			1,989			1,664			78,441
Equity		546,496			1,048,661			93,826			202,261			133,209
Operating revenue		668,945			3,567,512			81,390			198,994			315,948
Profit or loss for the year		68,863			163,131			202			4,298			143
Total comprehensive income		68,785			178,744			202			1,399			143
Cash flows from operating activities		155,399			92,818			7,271			28,987			60,461
Cash flows from investing activities		(210,480	)		(37,313	)		(8,191	)		(33,238	)		(45,243	)
Cash flows from financing activities before dividend paid to non-controlling interests		(16,647	)		(147,306	)		—			—			—
Dividend paid to non-controlling interests		(8,279	)		(44,637	)		—			—			—
Gain or loss foreign currency translation		—			(178	)		—			3			—
Net (decrease)/increase in cash and cash equivalents		(71,728	)		(91,801	)		(920	)		(4,251	)		15,218

	December 31, 2017
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	324,632		￦	3,225,262		￦	73,527		￦	150,368		￦	73,023
Non-current assets		468,261			823,001			41,598			107,872			191,330
Current liabilities		185,995			2,868,669			18,450			49,922			90,569
Non-current liabilities		24,555			86,369			487			3,021			41,064
Equity		582,343			1,093,225			96,188			205,297			132,720
Operating revenue		687,752			3,628,995			69,234			227,884			317,591
Profit or loss for the year		57,314			156,109			2,112			3,225			2,885
Total comprehensive income (loss)		55,586			141,719			2,362			3,036			(490	)
Cash flows from operating activities		99,269			108,203			13,895			28,320			57,262
Cash flows from investing activities		(81,758	)		(568,518	)		(17,354	)		(36,086	)		(43,483	)
Cash flows from financing activities before dividend paid to non-controlling interests		(19,739	)		(97,221	)		—			—			—
Dividend paid to non-controlling interests		(9,817	)		(29,490	)		—			—			—
Gain or loss foreign currency translation		—			(184	)		—			(47	)		—
Net (decrease)/increase in cash and cash equivalents		(2,228	)		(557,536	)		(3,459	)		(7,766	)		13,779

	December 31, 2018
(In millions of Korean won)	KT Skylife Co., Ltd.			BC Card Co., Ltd.			KT Powertel Co., Ltd.			KT Hitel Co., Ltd.			KT Telecop Co., Ltd.
Non-controlling Interests rate (%)		49.73	%		30.46	%		55.15	%		32.87	%		13.18	%
Current assets	￦	301,739		￦	2,997,429		￦	84,785		￦	161,162		￦	52,367
Non-current assets		514,263			724,950			39,279			111,546			220,125
Current liabilities		112,411			2,520,050			27,187			63,231			85,648
Non-current liabilities		37,430			110,486			1,030			2,812			54,666
Equity		666,161			1,091,843			95,847			206,665			132,178
Operating revenue		694,059			3,551,715			65,620			279,117			328,262
Profit or loss for the year		52,010			70,889			(5,545	)		657			166
Total comprehensive income (loss)		47,787			116,604			(5,792	)		738			(1,517	)
Cash flows from operating activities		183,474			86,299			11,603			43,855			40,351
Cash flows from investing activities		(139,846	)		128,538			(2,580	)		(26,335	)		(76,969	)
Cash flows from financing activities		(77,647	)		(117,561	)		—			—			10,000
Net increase (decrease) in cash and cash equivalents		(34,019	)		97,276			9,023			17,520			(26,618	)
Cash and cash equivalents at beginning of year		65,747			177,826			6,626			21,647			32,326
Exchange differences		—			(13	)		—			19			—
Cash and cash equivalents at end of year		31,728			275,089			15,649			39,186			5,708

Summary of Changes in Ownership Interest on the Equity Attributable to Owners

The effect of changes in the ownership interest on the equity attributable to owners of the Group during 2016, 2017 and 2018 is summarized as follows:

(In millions of Korean won)	2016		2017			2018
Carrying amount of non-controlling interests acquired	￦	4,022	￦	(732	)	￦	(194	)
Consideration paid to non-controlling interests		7,347		6,173			11,312
Excess of consideration paid recognized in parent’s equity	￦	11,369	￦	5,441		￦	11,118

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Business Combination (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Business Combination

Details of the business combination are as follows:

(In millions of Korean won)	Business line	Date	Purchase consideration
SG Safety Corporation	Unmanned security business	May 31, 2018	￦	27,544
KT MOS Bukbu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		8,160
KT MOS Nambu Co., Ltd.	Telecommunication facility maintenance	September 30, 2018		6,310
CJ Digital Music Co., Ltd.	Music distribution	October 10, 2018		50,948

Fair value of the purchase consideration from the business combination is as follows:

(In millions of Korean won)	SG Safety Corporation			KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Cash and cash equivalents	￦	28,000		￦	6,283	￦	4,765	￦	—
Settled receivables1		(456	)		—		—		—
Fair value of equity instruments previously held2		—			1,877		1,545		—
Fair value of equity instruments newly issued3		—			—		—		50,948
Total	￦	27,544		￦	8,160	￦	6,310	￦	50,948

1 Uncollected amount which incurred after the payment of consideration from adjustment of purchase consideration caused by additional retirement benefit.

2 The shares previously held by KT MOS Bukbu Co., Ltd. (93,994 ordinary shares) and KT MOS Nambu Co., Ltd. (65,831 ordinary shares), non-listed entities, were evaluated by using the profit approach.

3 The fair value (￦50,948 million) of 8,992,685 ordinary shares of GENIE Music Corporation, the consideration transferred, was based on the share price disclosed at the merger date. The issuance cost amounting to ￦31 million were deducted from deemed issuance price.

Schedule of Fair Value of Assets and Liabilities Recognized as a Result of Acquisition at Acquisition Date

Fair value of the assets and liabilities recognized as a result of the acquisition at the acquisition date are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Recognized amounts of identifiable assets acquired	￦	17,763	￦	14,924	￦	12,242	￦	28,117
Cash and cash equivalents		—		7,864		3,340		1,556
Trade and other receivables		—		4,827		6,318		11,200
Other current assets		1,367		160		85		484
Inventories		—		—		—		5
Current income tax assets		—		—		75		—
Property and equipment		4,047		855		1,104		791
Intangible assets				997		478		1,860
Distribution agency contract (included in intangibles)		—		—		—		11,753
Contractual customer relationship (included in intangibles)		10,467		—		—		468
Deferred income tax assets		—		113		576		—
Other non-current assets		1,882		10		—		—
Other non-current financial assets		—		98		266		—
Recognized amounts of identifiable liabilities assumed		5,637		10,050		6,433		25,559
Trade and other payables		120		6,767		3,327		18,947
Borrowings		5,000		—		—		—
Other current liabilities		—		363		703		3,481
Current income tax liabilities		—		103		—
Post-employment benefit obligations		517		2,768		2,360		311
Deferred income tax liabilities		—		—		—		2,497
Other non-current liabilities		—		49		43		323
Total	￦	12,126	￦	4,874	￦	5,809	￦	2,558

Schedule of Recognized Goodwill as a Result of Business Combination

As at December 31, 2018, details of the recognized goodwill as a result of the business combination are as follows:

(In millions of Korean won)	SG Safety Corporation		KT MOS Bukbu Co., Ltd		KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration	￦	27,544	￦	8,160	￦	6,310	￦	50,948
Add: Non-controlling interests1		—		—		101		—
Less:
Fair value of identifiable net assets		12,126		4,874		5,809		2,558
Goodwill2	￦	15,418	￦	3,286	￦	602	￦	48,390

1 Non-controlling interests for KT MOS Nambu Co., Ltd. acquired during the year ended December 31, 2018 are measured at proportionate shares of acquiree’s identifiable net assets.

2 The goodwill from the business combination is attributable to economies of scale expected and the acquired customer relationships.

Schedule of Cash Outflows as a Result of Acquisition

Details of cash outflows as a result of acquisition are as follows:

(In millions of Korean won)	SG Safety Corporation1		KT MOS Bukbu Co., Ltd			KT MOS Nambu Co., Ltd.		CJ Digital Music Co., Ltd.
Purchase consideration
Cash1	￦	28,000	￦	6,283		￦	4,765	￦	—
Less:
Recognized amounts of cash and cash equivalents		—		7,864			3,340		1,556
Total	￦	28,000	￦	(1,581	)	￦	1,425	￦	(1,556	)

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Changes in Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Impact on Financial Statements Due to Application of IFRS 15 at the Date of Initial Application

The impact on the financial statements due to the application of IFRS 15 at the date of initial application (January 1, 2018) is as follows:

	January 1, 2018
(In millions of Korean won)	Before application of IFRS 15 (*)		Adjustment			After application of IFRS 15
Current assets	￦	9,828,525	￦	1,288,908		￦	11,117,433
Trade and other receivables		5,964,565		4,475			5,969,040
Inventories		642,027		—			642,027
Other current assets1,2		304,860		1,284,433			1,589,293
Others		2,917,073		—			2,917,073
Non-current assets		20,067,196		68,060			20,135,256
Trade and other receivables		828,832		(2,285	)		826,547
Deferred income tax assets		712,222		(352,273	)		359,949
Other non-current assets1,2		107,165		422,618			529,783
Others		18,418,977		—			18,418,977
Total assets	￦	29,895,721	￦	1,356,968		￦	31,252,689
Current liabilities	￦	9,474,162	￦	269,893		￦	9,744,055
Trade and other payables		7,426,088		297			7,426,385
Deferred revenue		17,906		33,655			51,561
Provisions		78,172		177			78,349
Other current liabilities1		258,315		235,764			494,079
Others		1,693,681		—			1,693,681
Non-current liabilities		7,238,205		80,236			7,318,441
Deferred revenue		91,698		23,831			115,529
Deferred income tax liabilities		128,462		6,905			135,367
Other non-current liabilities1		237,283		49,500			286,783
Others		6,780,762		—			6,780,762
Total liabilities	￦	16,712,367	￦	350,129		￦	17,062,496
Equity attribute to owners of the Controlling Company	￦	11,791,590	￦	929,866		￦	12,721,456
Non-controlling interest		1,391,764		76,973			1,468,737
Total equity	￦	13,183,354	￦	1,006,839		￦	14,190,193

(*) The amounts in this column are before the adjustments from the adoption of IFRS 9.

The effect of adoption of IFRS 15 on the consolidated financial statements for the year ended December 31, 2018, is as follows.

- Consolidated statement of financial position

	December 31, 2018
(In millions of Korean won)	Reported Amount (*)		Adjustments			Amount before application of IFRS 15
Current assets	￦	12,157,814	￦	(1,335,128	)	￦	10,822,686
Trade and other receivables		5,680,349		7,141			5,687,490
Inventories		1,074,634		53,035			1,127,669
Other current assets1,2		1,687,548		(1,395,304	)		292,244
Others		3,715,283		—			3,715,283
Non-current assets		20,316,306		(87,432	)		20,228,874
Trade and other receivables		842,995		4,617			847,612
Deferred income tax assets		465,369		356,928			822,297
Other non-current assets1,2		545,895		(448,977	)		96,918
Others		18,462,047		—			18,462,047
Total assets	￦	32,474,120	￦	(1,422,560	)	￦	31,051,560
Current liabilities	￦	9,394,123	￦	(318,260	)	￦	9,075,863
Deferred revenue		52,878		(38,057	)		14,821
Provisions		117,881		(565	)		117,316
Other current liabilities1		596,589		(279,638	)		316,951
Others		8,626,775		—			8,626,775
Non-current liabilities		8,421,507		(54,508	)		8,366,999
Deferred revenue		110,702		(27,233	)		83,469
Deferred income tax liabilities		204,785		(21,019	)		183,766
Other non-current liabilities1		423,626		(6,256	)		417,370
Others		7,682,394		—			7,682,394
Total liabilities	￦	17,815,630	￦	(372,768	)	￦	17,442,862
Equity attribute to owners of the Controlling Company	￦	13,129,901	￦	(970,430	)	￦	12,159,471
Non-controlling interest		1,528,589		(79,362	)		1,449,227
Total equity	￦	14,658,490	￦	(1,049,792	)	￦	13,608,698

(*) Amounts include adjustments arising from adoption of IFRS 9.

¹  Allocation the transaction price

With the implementation of IFRS 15, the Group allocates the transaction price to each performance obligation identified in the contract based on a relative stand-alone selling prices of the goods or services being provided to the customer. To allocate the transaction price to each performance obligation on a relative stand-alone price basis, the Group determines the stand-alone selling price at contract inception of the distinct goods or services underlying each performance obligation in the contract and allocate the transaction price in proportion to those stand-alone selling price. The stand-alone selling price is the price at which the Group would sell promised goods or services separately to the customer. The best evidence of a stand-alone selling price is the observable price of a goods or services when the Group sells that goods or services separately in similar circumstances and to similar customers. The Group recognizes the allocated amount as contract assets or contract liabilities, and amortizes it through the remaining period which is adjusted in operating income.

In relation to this, as at December 31, 2018, contract assets and contract liabilities are increased by ￦398,797 million (January 1, 2018: ￦421,131 million) and ￦347,461 million (January 1, 2018: ￦282,836 million), respectively.

²  Incremental costs of obtaining a contract

The Group pays the commission fees when new customer subscribe for telecommunication services. The incremental costs of obtaining a contract are those commission fees that the Group incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained.

According to IFRS 15, the Group recognizes as an asset the incremental cost of obtaining contract and amortize it through the contract period. However, as a practical expedient, the Group recognizes the incremental costs of obtaining a contracts as an expense when incurred if the amortization period of the asset is one year or less.

In relation to this, prepaid expenses are increased by ￦1,444,822 million as at December 31, 2018 (January 1, 2018: ￦1,285,443 million).

- Consolidated statement of profit or loss

	2018
(In millions of Korean won)	Reported Amount (*)			Adjustments			Amount before application of IFRS 15
Operating revenue	￦	23,436,050		￦	268,270		￦	23,704,320
Operating expenses		22,335,190			316,495			22,651,685
Operating profit		1,100,860			(48,225	)		1,052,635
Financial income		374,243			(3,862	)		370,381
Financial costs		435,659			16,860			452,519
Share of net losses of associates and joint venture		(5,467	)		—			(5,467	)
Profit before income tax		1,033,977			(68,947	)		965,030
Income tax expense		314,565			(17,944	)		296,621
Profit for the year	￦	719,412		￦	(51,003	)	￦	668,409

(*) Amounts include adjustments arising from adoption of IFRS 9.

Summary of Beginning Balance of Retained Earnings after Adjustment Due to Application of IFRS 9

Details of the Group’s beginning balance of retained earnings after adjustment due to application of IFRS 9, are as follows:

(In millions of Korean won)	January 1, 2018
Beginning balance — IAS 39	￦	9,961,150
Reclassification of available-for-sale securities to financial assets at fair value through profit or loss		32,754
Reclassification of available-for-sale securities to financial assets at fair value through other comprehensive income		2,191
Increase in provision for impairment of financial assets at amortized cost		(1,817	)
Increase in provision with unused limit		(287	)
Decrease in deferred income tax assets		(8,395	)
Adjustments of non-controlled interests		(259	)
Adjustments to retained earnings from adoption of IFRS 9		24,187
Beginning balance of retained earnings — IFRS 9		9,985,337
Adjustment to retained earnings from adoption of IFRS 15		929,866
Beginning balance of retained earnings after adjustment	￦	10,915,203

Summary of Effects Resulting from Classification and Measurement of Financial Instruments

The main effects resulting from this reclassification are as follows:

(In millions of Korean won)	Classification in accordance with		Amount in accordance with
Account	IAS 39	IFRS 9	IAS 39		IFRS 9		Differences
Financial assets
Cash and cash equivalent	Loans and receivables	Financial assets measured at amortized cost	￦	1,928,182	￦	1,928,182	￦	—
Trade and other receivables	Loans and receivables	Financial assets measured at amortized cost		6,793,397		5,836,089		(1,028	)
		Financial assets at fair value through other comprehensive income				980,766		24,486
Other financial assets	Loans and receivables	Financial assets measured at amortized cost		1,333,317		462,075		(789)
		Financial assets at fair value through profit or loss				870,453		—
	Financial assets at fair value through profit or loss	Financial assets at fair value through profit or loss		5,813		5,813		—
	Derivative financial assets for hedging purpose	Derivative financial assets for hedging purpose		7,389		7,389		—
	Financial assets available-for-sale	Financial assets measured at amortized cost				28,603		—
		Financial assets at fair value through profit or loss		380,953		127,276		32,745
		Financial assets at fair value through other comprehensive income				259,904		2,085
	Financial assets held-to-maturity	Financial assets measured at amortized cost				51		—
		Financial assets at fair value through profit or loss		151		100		—
		Financial assets at fair value through other comprehensive income				—		—
Financial liabilities
Trade payables and payables	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		￦8,427,457		￦8,427,457		￦—
Borrowing	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		6,683,662		6,683,662		—
Other financial liabilities	Financial liabilities at fair value through profit or loss	Financial liabilities at fair value through profit or loss		5,051		5,051		—
Other financial liabilities	Derivative financial liabilities for hedging purpose	Derivative financial liabilities for hedging purpose		93,770		93,770		—
Other financial liabilities (*)	Other financial liabilities measured at amortized cost	Financial assets measured at amortized cost		89,104		89,391		287

(*) The amount includes provisions of which loss allowance is remeasured due to adoption of IFRS 9.

Summary of Impact on Changes in Equity

The impact on these changes on the Group’s equity as at January 1, 2018, is as follows:

(In millions of Korean won)	Accumulated other comprehensive income			Retained earnings
Reclassification from loans and receivables to financial assets at fair value through other comprehensive income, and fair value assessment	￦	24,486		￦	—
Reclassification from available-for-sale financial assets to financial assets at fair value through profit or loss, and fair value assessment		(9	)		32,754
Reclassification from available-for-sale financial assets to financial assets at fair value through other comprehensive income		(106	)		2,191
Increase in provision for impairment of financial assets at amortized cost		—			(1,817	)
Increase in provision with unused limit		—			(287	)
Income tax effect		(6,734	)		(8,395	)
Adjustments of non-controlled interests		104			(259	)
Total adjustments from application of IFRS 9	￦	17,741		￦	24,187

XML

Events after Reporting Period (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Public Bonds Issued After Reporting Period

Subsequent to the reporting period, public bonds issued are as follow:

	December 31, 2018
(In millions of Korean won)	Issue date		Carrying amount		Interest rate			Redemption date
The 191-1st Public bond		2019.01.15	￦	220,000		2.048	%		2022.01.14
The 191-2nd Public bond		2019.01.15		80,000		2.088	%		2024.01.15
The 191-3rd Public bond		2019.01.15		110,000		2.160	%		2029.01.15
The 191-4th Public bond		2019.01.15		90,000		2.213	%		2039.01.14

XML

Revision of prior financial statements (Tables)

12 Months Ended

Dec. 31, 2018

Text block [abstract]

Summary of Revision of Prior Period Financial Statements

The Group revised the prior period financial statements to correct errors in relation to the under-statement of revenue due to omission of data transferring from billing system to finance system, and the details are as follows:

Consolidated Statements of financial position

(In millions of Korean won)	January 1, 2017						December 31, 2017
	As Previously Reported		Adjustments		As Revised		As Previously Reported		Adjustments		As Revised
Current assets	￦	9,716,020	￦	150,282	￦	9,866,302	￦	9,678,243	￦	150,282	￦	9,828,525
Trade and other receivables		5,327,352		150,282		5,477,634		5,814,283		150,282		5,964,565
Total assets	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721
Current liabilities	￦	9,523,137	￦	16,058	￦	9,539,195	￦	9,458,104	￦	16,058	￦	9,474,162
Trade and other payables		7,139,771		1,954		7,141,725		7,424,134		1,954		7,426,088
Current income tax liabilities		88,739		14,104		102,843		68,880		14,104		82,984
Total liabilities	￦	17,881,580	￦	16,058	￦	17,897,638	￦	16,696,309	￦	16,058	￦	16,712,367
Equity attribute to owners of the Controlling Company	￦	11,429,874	￦	134,224	￦	11,564,098	￦	11,657,366	￦	134,224	￦	11,791,590
Retained earnings		9,644,483		134,224		9,778,707		9,826,926		134,224		9,961,150
Total equity		12,782,718		134,224		12,916,942		13,049,130		134,224		13,183,354
Total liabilities and equity	￦	30,664,298	￦	150,282	￦	30,814,580	￦	29,745,439	￦	150,282	￦	29,895,721

Consolidated Statement of operations & Comprehensive Income

(In millions of Korean won)	Year ended December 31, 2016
	As Previously Reported		Adjustments		As Revised
Operating revenue	￦	23,120,878	￦	43,324	￦	23,164,202
Operating profit		1,339,780		43,324		1,383,104
Profit before income tax		1,123,431		43,324		1,166,755
Income tax expense		328,314		6,596		334,910
Profit for the year	￦	795,117	￦	36,728	￦	831,845
Profit for the year attributable to the equity holders of the Controlling Company		708,362		36,728		745,090
Total comprehensive income for the year	￦	789,447	￦	36,728	￦	826,175
Total comprehensive income for the year attributable to the equity holders of the Controlling Company	￦	701,685	￦	36,728	￦	738,413

Consolidated Statements of changes in equity

(In millions of Korean won)

As Previously Reported

Adjustments

As Revised

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Retained earnings

Owners of the Controlling Company

Balance at January 1, 2016

￦

9,049,971

￦

10,835,735

￦

97,496

￦

97,496

￦

9,147,467

￦

10,933,231

Balance at December 31, 2016

￦

9,644,483

￦

11,429,874

￦

134,224

￦

134,224

￦

9,778,707

￦

11,564,098

Balance at December 31, 2017

￦

9,826,926

￦

11,657,366

￦

134,224

￦

134,224

￦

9,961,150

￦

11,791,590

The increase in retained earnings due to revision of prior period financial statements before January 1, 2016 is ￦97,496 million.

XML

General Information - Additional Information (Detail) - shares	Jul. 02, 2001	May 09, 1999
Disclosure of general information [line items]
Number of additional shares issued	55,502,161	24,282,195
Government Owned shares [member]
Disclosure of general information [line items]
Number of additional shares issued		20,813,311

XML

General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017
Disclosure of subsidiaries [line items]
Total assets	₩ 32,474,120	₩ 29,895,721		₩ 31,252,689	₩ 30,814,580
Total liabilities	17,815,630	16,712,367		₩ 17,062,496	₩ 17,897,638
Operating revenues	23,436,050	23,546,929	₩ 23,164,202
Profit (loss) for the year	₩ 719,412	₩ 546,341	₩ 831,845
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Powertel Co., Ltd.	KT Powertel Co., Ltd.	KT Powertel Co., Ltd.
Total assets	₩ 124,064	₩ 115,125	₩ 113,725
Type of Business	Trunk radio system business
Total liabilities	₩ 28,217	18,937	19,899
Location	Korea
Operating revenues	₩ 65,620	₩ 69,234	81,390
Controlling percentage ownership	44.80%	44.80%
Profit (loss) for the year	₩ (5,545)	₩ 2,112	₩ 202
Closing month	December
KT Linkus Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Linkus Co., Ltd.	KT Linkus Co., Ltd.	KT Linkus Co., Ltd.
Total assets	₩ 54,147	₩ 59,344	₩ 64,318
Type of Business	Public telephone maintenance
Total liabilities	₩ 44,895	51,516	56,953
Location	Korea
Operating revenues	₩ 106,337	₩ 112,043	117,587
Controlling percentage ownership	92.40%	91.40%
Profit (loss) for the year	₩ 1,216	₩ 725	₩ (3,830)
Closing month	December
KT Submarine Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Submarine Co., Ltd.	KT Submarine Co., Ltd.	KT Submarine Co., Ltd.
Total assets	₩ 130,715	₩ 142,797	₩ 156,993
Type of Business	Submarine cable construction and maintenance
Total liabilities	₩ 27,530	34,056	55,573
Location	Korea
Operating revenues	₩ 61,652	₩ 73,985	84,137
Controlling percentage ownership	39.30%	39.30%
Profit (loss) for the year	₩ (4,286)	₩ 8,243	₩ 5,146
Closing month	December
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Telecop Co., Ltd.	KT Telecop Co., Ltd.	KT Telecop Co., Ltd.
Total assets	₩ 272,492	₩ 264,353	₩ 265,553
Type of Business	Security service
Total liabilities	₩ 140,314	131,633	132,344
Location	Korea
Operating revenues	₩ 328,262	₩ 317,591	315,948
Controlling percentage ownership	86.80%	86.80%
Profit (loss) for the year	₩ 166	₩ 2,885	₩ 143
Closing month	December
KT Hitel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Hitel Co., Ltd.	KT Hitel Co., Ltd.	KT Hitel Co., Ltd.
Total assets	₩ 272,708	₩ 258,240	₩ 249,202
Type of Business	Data communication
Total liabilities	₩ 66,043	52,943	46,941
Location	Korea
Operating revenues	₩ 279,117	₩ 227,884	198,994
Controlling percentage ownership	67.10%	67.10%
Profit (loss) for the year	₩ 657	₩ 3,225	₩ 4,298
Closing month	December
KT service bukbu Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Service Bukbu Co., Ltd.	KT Service Bukbu Co., Ltd.	KT Service Bukbu Co., Ltd.
Total assets	₩ 30,599	₩ 29,281	₩ 32,863
Type of Business	Opening services of fixed line
Total liabilities	₩ 23,964	22,096	24,580
Location	Korea
Operating revenues	₩ 195,961	₩ 194,837	182,952
Controlling percentage ownership	67.30%	67.30%
Profit (loss) for the year	₩ (31)	₩ 688	₩ 694
Closing month	December
KT service nambu Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Service Nambu Co., Ltd.	KT Service Nambu Co., Ltd.	KT Service Nambu Co., Ltd.
Total assets	₩ 37,452	₩ 36,076	₩ 32,621
Type of Business	Opening services of fixed line
Total liabilities	₩ 27,939	26,412	24,282
Location	Korea
Operating revenues	₩ 230,088	₩ 232,996	218,602
Controlling percentage ownership	77.30%	77.30%
Profit (loss) for the year	₩ 160	₩ 875	₩ 772
Closing month	December
KT Commerce Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Commerce Inc.
Type of Business	B2C, B2B service
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KT Strategic Investment Fund No.1 [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.1
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KT Strategic Investment Fund No.2 [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.2
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KT Strategic Investment Fund No.3 [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.3
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KT strategic investment fund number four [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.4
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
BCVP Strategic Investment Fund Number One [member]
Disclosure of subsidiaries [line items]
Subsidiary	BC-VP Strategic Investment Fund No.1
Type of Business	Investment fund
Location	Korea
Controlling percentage ownership	100.00%
Closing month	December
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	BC Card Co., Ltd.	BC Card Co., Ltd.	BC Card Co., Ltd.1
Total assets	₩ 3,722,379	₩ 4,048,263	₩ 3,651,065
Type of Business	Credit card business
Total liabilities	₩ 2,630,536	2,955,038	2,602,404
Location	Korea
Operating revenues	₩ 3,551,715	₩ 3,628,995	3,567,512
Controlling percentage ownership	69.50%	69.50%
Profit (loss) for the year	₩ 70,889	₩ 156,109	₩ 163,131
Closing month	December
VP Inc. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	VP Inc.
Type of Business	Payment security service for credit card, others
Location	Korea
Controlling percentage ownership	50.90%	50.90%
Closing month	December
H&C Network [member]
Disclosure of subsidiaries [line items]
Subsidiary	H&C Network	H&C Network	H&C Network1
Total assets	₩ 245,841	₩ 273,856	₩ 272,110
Type of Business	Call centre for financial sectors
Total liabilities	₩ 63,188	65,446	80,983
Location	Korea
Operating revenues	₩ 297,470	₩ 277,622	266,613
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (15,944)	₩ 16,104	₩ 14,749
Closing month	December
BC Card China Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	BC Card China Co., Ltd.
Type of Business	Software development and data processing
Location	China
Controlling percentage ownership	100.00%	100.00%
Closing month	December
INITECH Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	INITECH Co., Ltd.
Type of Business	Internet banking ASP and security solutions
Location	Korea
Controlling percentage ownership	58.20%	58.20%
Closing month	December
Smartro Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Smartro Co., Ltd.
Type of Business	VAN (Value Added Network) business
Location	Korea
Controlling percentage ownership	81.10%	81.10%
Closing month	December
KTDS Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTDS Co., Ltd.	KTDS Co., Ltd.	KTDS Co., Ltd.1
Total assets	₩ 148,675	₩ 144,922	₩ 197,970
Type of Business	System integration and maintenance
Total liabilities	₩ 95,834	93,343	151,644
Location	Korea
Operating revenues	₩ 434,302	₩ 459,266	476,379
Controlling percentage ownership	95.50%	95.50%
Profit (loss) for the year	₩ 8,586	₩ 11,584	₩ 10,838
Closing month	December
KT M Hows Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M Hows Co., Ltd.	KT M Hows Co., Ltd.	KT M Hows Co., Ltd.
Total assets	₩ 60,197	₩ 42,738	₩ 28,539
Type of Business	Mobile marketing
Total liabilities	₩ 42,386	28,489	18,466
Location	Korea
Operating revenues	₩ 26,673	₩ 24,610	19,922
Controlling percentage ownership	90.00%	90.00%
Profit (loss) for the year	₩ 3,691	₩ 4,097	₩ 2,865
Closing month	December
KT M&S Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M&S Co., Ltd.	KT M&S Co., Ltd.	KT M&S Co., Ltd.
Total assets	₩ 228,073	₩ 242,388	₩ 247,854
Type of Business	PCS distribution
Total liabilities	₩ 207,740	231,151	227,507
Location	Korea
Operating revenues	₩ 791,652	₩ 734,420	724,144
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 11,408	₩ (9,707)	₩ (12,955)
Closing month	December
GENIE Music Corporation K T Music Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	GENIE Music Corporation(KT Music Corporation)
Type of Business	Online music production and distribution
Location	Korea
Controlling percentage ownership	36.00%	42.50%
Closing month	December
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Bukbu Co., Ltd.
Total assets	₩ 14,121
Type of Business	Telecommunication facility maintenance
Total liabilities	₩ 10,571
Location	Korea
Operating revenues	₩ 16,543
Controlling percentage ownership	100.00%
Profit (loss) for the year	₩ (782)
Closing month	December
KTMOS Nambu Co.,Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Nambu Co., Ltd.
Total assets	₩ 14,313
Type of Business	Telecommunication facility maintenance
Total liabilities	₩ 8,927
Location	Korea
Operating revenues	₩ 14,941
Controlling percentage ownership	98.40%
Profit (loss) for the year	₩ (2,418)
Closing month	December
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Skylife Co., Ltd.	KT Skylife Co., Ltd.	KT Skylife Co., Ltd.1
Total assets	₩ 816,001	₩ 792,893	₩ 777,948
Type of Business	Satellite broadcasting business
Total liabilities	₩ 149,841	210,550	231,452
Location	Korea
Operating revenues	₩ 694,059	₩ 687,752	668,945
Controlling percentage ownership	50.30%	50.30%
Profit (loss) for the year	₩ 52,010	₩ 57,314	₩ 68,863
Closing month	December
Skylife TV Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Skylife TV Co., Ltd.
Type of Business	TV contents provider
Location	Korea
Controlling percentage ownership	92.60%	92.60%
Closing month	December
KT Estate Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Estate Inc.	KT Estate Inc.	KT Estate Inc.1
Total assets	₩ 1,695,995	₩ 1,869,194	₩ 1,734,729
Type of Business	Residential building development and supply
Total liabilities	₩ 304,712	502,915	375,341
Location	Korea
Operating revenues	₩ 569,269	₩ 428,446	405,417
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 51,854	₩ 52,416	₩ 46,815
Closing month	December
KT AMC Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT AMC Co., Ltd.
Type of Business	Asset management and consulting services
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
NEXR Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	NEXR Co., Ltd.
Type of Business	Cloud system implementation
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KTSB Data service [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTSB Data service	KTSB Data service	KTSB Data service
Total assets	₩ 8,632	₩ 18,306	₩ 20,075
Type of Business	Data centre development and related service
Total liabilities	₩ 523	605	759
Location	Korea
Operating revenues	₩ 4,627	₩ 4,950	5,136
Controlling percentage ownership	51.00%	51.00%
Profit (loss) for the year	₩ (9,576)	₩ (1,651)	₩ (1,983)
Closing month	December
KT Sat Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sat Co., Ltd.	KT Sat Co., Ltd.	KT Sat Co., Ltd.
Total assets	₩ 685,926	₩ 742,391	₩ 744,653
Type of Business	Satellite communication business
Total liabilities	₩ 173,513	220,804	253,041
Location	Korea
Operating revenues	₩ 137,186	₩ 147,649	144,594
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 4,921	₩ 29,601	₩ 36,266
Closing month	December
Nasmedia Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.
Total assets	₩ 303,112	₩ 315,967	₩ 263,925
Type of Business	Online advertisement
Total liabilities	₩ 161,164	188,197	159,502
Location	Korea
Operating revenues	₩ 106,805	₩ 120,667	70,037
Controlling percentage ownership	42.80%	42.80%
Profit (loss) for the year	₩ 20,596	₩ 26,676	₩ 11,972
Closing month	December
KT sports [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sports Co., Ltd	KT Sports	KT Sports
Total assets		₩ 11,131	₩ 16,925
Type of Business	Management of sports group
Total liabilities		7,805	13,573
Location	Korea
Operating revenues		₩ 53,357	48,476
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year		₩ (199)	₩ (198)
Closing month	December
KT music contents fund no.1 [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Music Contents Fund No.1	KT Music Contents Fund No.1	KT Music Contents Fund No.1
Total assets	₩ 14,092	₩ 13,804	₩ 10,592
Type of Business	Music contents investment business
Total liabilities	₩ 1,035	1,041	331
Location	Korea
Operating revenues	₩ 559	₩ 370	349
Controlling percentage ownership	80.00%	80.00%
Profit (loss) for the year	₩ 294	₩ (499)	₩ 103
Closing month	December
K T Music Contents Fund No.2 [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Music Contents Fund No.2
Type of Business	Music contents investment business
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
KT-Michigan global content fund [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT-Michigan Global Content Fund	KT-Michigan Global Content Fund	KT-Michigan Global Content Fund
Total assets	₩ 12,741	₩ 14,575	₩ 16,250
Type of Business	Content investment business
Total liabilities		147	163
Location	Korea
Operating revenues	₩ 869	₩ 159	133
Controlling percentage ownership	88.60%	88.60%
Profit (loss) for the year	₩ (670)	₩ (426)	₩ (514)
Closing month	December
Autopion Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Autopion Co., Ltd.	Autopion Co., Ltd.	Autopion Co., Ltd.
Total assets	₩ 8,838	₩ 6,306	₩ 6,163
Type of Business	Service for information and communication
Total liabilities	₩ 5,801	3,530	2,794
Location	Korea
Operating revenues	₩ 12,035	₩ 6,679	7,772
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 453	₩ (618)	₩ (409)
Closing month	December
KTCS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTCS Corporation	KTCS Corporation	KTCS Corporation1
Total assets	₩ 350,280	₩ 348,334	₩ 322,768
Type of Business	Database and online information provider
Total liabilities	₩ 188,561	188,764	166,642
Location	Korea
Operating revenues	₩ 1,019,787	₩ 968,186	955,050
Controlling percentage ownership	30.90%	30.90%
Profit (loss) for the year	₩ 11,401	₩ 7,385	₩ 7,892
Closing month	December
KTIS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTIS Corporation	KTIS Corporation	KTIS Corporation
Total assets	₩ 229,246	₩ 223,818	₩ 221,176
Type of Business	Database and online information provider
Total liabilities	₩ 68,997	62,569	63,871
Location	Korea
Operating revenues	₩ 451,532	₩ 438,597	436,914
Controlling percentage ownership	30.10%	30.10%
Profit (loss) for the year	₩ 7,900	₩ 8,337	₩ 9,991
Closing month	December
KT M mobile [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M mobile	KT M mobile	KT M mobile
Total assets	₩ 146,334	₩ 93,601	₩ 131,446
Type of Business	Special category telecommunications operator and sales of communication device
Total liabilities	₩ 35,335	21,453	20,369
Location	Korea
Operating revenues	₩ 172,674	₩ 159,684	112,532
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (10,085)	₩ (38,883)	₩ (40,041)
Closing month	December
KT Investment Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Investment Co., Ltd.	KT Investment Co., Ltd.	KT Investment Co., Ltd.1
Total assets	₩ 74,580	₩ 54,673	₩ 39,506
Type of Business	Technology business finance
Total liabilities	₩ 58,040	38,313	23,123
Location	Korea
Operating revenues	₩ 8,095	₩ 8,794	10,130
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 247	₩ (619)	₩ (1,832)
Closing month	December
Whowho&Company Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Whowho&Company Co., Ltd.
Type of Business	Software development and supply
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
PlayD Co., Ltd. (N Search Marketing Co., Ltd.) [member]
Disclosure of subsidiaries [line items]
Subsidiary	PlayD Co., Ltd. (N Search Marketing Co., Ltd.)
Type of Business	Advertising agency business
Location	Korea
Controlling percentage ownership	100.00%	100.00%
Closing month	December
Next Connect PFV [member]
Disclosure of subsidiaries [line items]
Subsidiary	Next connect PFV
Total assets	₩ 385,769
Type of Business	Residential building development and supply
Total liabilities	₩ 34,370
Location	Korea
Operating revenues	₩ 143
Controlling percentage ownership	100.00%
Profit (loss) for the year	₩ (12,449)
Closing month	December
KT Rwanda Networks Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Rwanda Networks Ltd.	KT Rwanda Networks Ltd.	KT Rwanda Networks Ltd.
Total assets	₩ 144,129	₩ 151,359	₩ 167,112
Type of Business	Network installation and management
Total liabilities	₩ 162,801	139,561	138,651
Location	Rwanda
Operating revenues	₩ 15,150	₩ 15,931	13,435
Controlling percentage ownership	51.00%	51.00%
Profit (loss) for the year	₩ (29,238)	₩ (22,762)	₩ (31,455)
Closing month	December
AOS Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	AOS Ltd.	AOS Ltd.	AOS Ltd.
Total assets	₩ 14,018	₩ 9,437	₩ 10,025
Type of Business	System integration and maintenance
Total liabilities	₩ 4,952	4,519	3,179
Location	Rwanda
Operating revenues	₩ 6,300	₩ 8,952	14,481
Controlling percentage ownership	51.00%	51.00%
Profit (loss) for the year	₩ (680)	₩ (682)	₩ (1,123)
Closing month	December
KT Belgium [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Belgium	KT Belgium	KT Belgium
Total assets	₩ 90,172	₩ 86,455	₩ 79,391
Type of Business	Foreign investment business
Total liabilities	₩ 1	8	7
Location	Belgium
Operating revenues	₩ 29	₩ 49
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (43)	₩ (2)	₩ (67)
Closing month	December
KT ORS Belgium [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT ORS Belgium	KT ORS Belgium	KT ORS Belgium
Total assets	₩ 6,709	₩ 1,769	₩ 2,013
Type of Business	Foreign investment business
Total liabilities	₩ 5	14	23
Location	Belgium
Operating revenues		₩ 10
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (46)	₩ (10)	₩ (46)
Closing month	December
Korea Telecom Japan Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Korea Telecom Japan Co., Ltd.	Korea Telecom Japan Co., Ltd.	Korea Telecom Japan Co., Ltd.
Total assets	₩ 1,326	₩ 1,554	₩ 3,592
Type of Business	Foreign telecommunication business
Total liabilities	₩ 2,910	2,788	5,374
Location	Japan
Operating revenues	₩ 1,965	₩ 2,772	5,122
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (126)	₩ 536	₩ (1,391)
Closing month	December
KBTO sp.zo.o. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KBTO sp.zo.o.	KBTO sp.zo.o.	KBTO sp.zo.o.
Total assets	₩ 1,364	₩ 3,311	₩ 1,166
Type of Business	Electronic communication business
Total liabilities	₩ 217	2,268	2,378
Location	Poland
Operating revenues	₩ 202	₩ 67	21
Controlling percentage ownership	96.20%	94.30%
Profit (loss) for the year	₩ (3,771)	₩ (3,456)	₩ (2,587)
Closing month	December
Korea Telecom China Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Korea Telecom China Co., Ltd.	Korea Telecom China Co., Ltd.	Korea Telecom China Co., Ltd.
Total assets	₩ 661	₩ 665	₩ 532
Type of Business	Foreign telecommunication business
Total liabilities	₩ 22	32	188
Location	China
Operating revenues	₩ 681	₩ 1,030	930
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 10	₩ 348	₩ 60
Closing month	December
KT Dutch B.V. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Dutch B.V.	KT Dutch B.V.	KT Dutch B.V.
Total assets	₩ 31,693	₩ 30,312	₩ 34,197
Type of Business	Super iMax and East Telecom management
Total liabilities	₩ 41	50	73
Location	Netherlands
Operating revenues	₩ 191	₩ 206	166
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 105	₩ 169	₩ 85
Closing month	December
Super iMax LLC [member]
Disclosure of subsidiaries [line items]
Subsidiary	Super iMax LLC	Super iMax LLC	Super iMax LLC
Total assets	₩ 4,150	₩ 3,449	₩ 10,308
Type of Business	Wireless high speed internet business
Total liabilities	₩ 4,528	4,886	6,734
Location	Uzbekistan
Operating revenues	₩ 4,845	₩ 7,314	10,759
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (424)	₩ (4,584)	₩ (1,802)
Closing month	December
East Telecom LLC [member]
Disclosure of subsidiaries [line items]
Subsidiary	East Telecom LLC	East Telecom LLC	East Telecom LLC
Total assets	₩ 16,590	₩ 11,672	₩ 31,885
Type of Business	Fixed line telecommunication business
Total liabilities	₩ 14,263	11,748	16,554
Location	Uzbekistan
Operating revenues	₩ 15,087	₩ 19,663	27,492
Controlling percentage ownership	91.00%	91.00%
Profit (loss) for the year	₩ 2,639	₩ (9,118)	₩ 3,257
Closing month	December
Korea Telecom America, Inc. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Korea Telecom America, Inc.	Korea Telecom America, Inc.	Korea Telecom America, Inc.
Total assets	₩ 4,218	₩ 3,694	₩ 4,464
Type of Business	Foreign telecommunication business
Total liabilities	₩ 832	791	1,306
Location	USA
Operating revenues	₩ 7,554	₩ 6,783	7,113
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 350	₩ 109	₩ 181
Closing month	December
PT. KT Indonesia [member]
Disclosure of subsidiaries [line items]
Subsidiary	PT. KT Indonesia	PT. KT Indonesia	PT. KT Indonesia
Total assets	₩ 8	₩ 8	₩ 16
Type of Business	Foreign telecommunication business
Location	Indonesia
Controlling percentage ownership	99.00%	99.00%
Profit (loss) for the year		₩ (6)	₩ (7)
Closing month	December
PT BC card Asia Pacific [member]
Disclosure of subsidiaries [line items]
Subsidiary	PT. BC Card Asia Pacific
Type of Business	Software development and supply
Location	Indonesia
Controlling percentage ownership	99.90%	99.90%
Closing month	December
KT Hongkong Telecommunications Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Hongkong Telecommunications Co., Ltd.	KT Hongkong Telecommunications Co., Ltd.	KT Hongkong Telecommunications Co., Ltd.
Total assets	₩ 3,616	₩ 2,578	₩ 1,571
Type of Business	Fixed line communication business
Total liabilities	₩ 2,143	1,497	956
Location	Hong Kong
Operating revenues	₩ 9,990	₩ 7,304	1,568
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 351	₩ 494	₩ 120
Closing month	December
KT Hong kong Limited [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Hong Kong Limited
Type of Business	Foreign investment business
Location	Hong Kong
Controlling percentage ownership	100.00%	100.00%
Closing month	December
Korea Telecom Singapore Pte.Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Korea Telecom Singapore Pte. Ltd.
Type of Business	Foreign investment business
Location	Singapore
Controlling percentage ownership	100.00%	100.00%
Closing month	December
Texnoprosistem LLP [member]
Disclosure of subsidiaries [line items]
Subsidiary	Texnoprosistem LLP
Type of Business	Fixed line internet business
Location	Uzbekistan
Controlling percentage ownership	100.00%	100.00%
Closing month	December
Nasmedia Thailand Company Limited [member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia Thailand Company Limited
Type of Business	Internet advertising solution
Location	Thailand
Controlling percentage ownership	99.90%
Closing month	December
GENIE Music Corporation(KT Music Corporation) [member]
Disclosure of subsidiaries [line items]
Subsidiary	GENIE Music Corporation (KT Music Corporation)	GENIE Music Corporation(KT Music Corporation)	GENIE Music Corporation (KT Music Corporation)
Total assets	₩ 221,559	₩ 139,686	₩ 110,080
Total liabilities	75,827	48,512	41,953
Operating revenues	171,314	156,163	111,450
Profit (loss) for the year	₩ 6,374	₩ (3,401)	₩ 8,235
KT Sports Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sports Co., Ltd.
Total assets	₩ 9,560
Total liabilities	6,376
Operating revenues	55,565
Profit (loss) for the year	₩ (154)
KT music contents fund number two [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Music Contents Fund No.2	KT Music Contents Fund No.2
Total assets	₩ 7,629	₩ 7,500
Total liabilities	281	11
Operating revenues	150
Profit (loss) for the year	₩ (142)	₩ (11)
KT Innoedu Co., Ltd. [Member]
Disclosure of subsidiaries [line items]
Subsidiary			KT Innoedu Co., Ltd.
Total assets			₩ 6,477
Total liabilities			7,259
Operating revenues			15,599
Profit (loss) for the year			₩ 103
NgeneBio [member]
Disclosure of subsidiaries [line items]
Subsidiary			NgeneBio
Total assets			₩ 6,361
Total liabilities			4,733
Operating revenues			244
Profit (loss) for the year			₩ (1,833)

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Significant Accounting Policies - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)
Disclosure of significant accounting policies [line items]
Lease term	Lease term is over 12 months
Description of assets which are not low value	Underlying assets are not low value assets
Useful lives of investment property, excluding land depreciated cost model	10 to 40 years
IFRS 16 leases [member]
Disclosure of significant accounting policies [line items]
Lease assets and liabilities	₩ 616,759

XML

Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 - 40 years
Structures [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 - 40 years
Machinery and equipment (Telecommunications equipment and others) [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 - 40 years
Vehicles [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	4 - 6 years
Tools [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	4 - 6 years
Office equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 - 6 years

XML

Significant Accounting Policies - Summary of Amortization of Intangible Assets With Limited Useful Life (Detail)	12 Months Ended
	Dec. 31, 2018
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 - 6 years
Software [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	6 years
Industrial property rights [Member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 - 50 years
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 - 10 years
Others [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	2 - 50 years

XML

Critical Accounting Estimates and Assumptions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Bottom of range [member]
Disclosure of changes in accounting estimates [line items]
Amortization term of contract assets and contract liabilities	20 months
Top of range [member]
Disclosure of changes in accounting estimates [line items]
Amortization term of contract assets and contract liabilities	34 months

XML

Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	₩ 8,521,379	₩ 8,427,457
Borrowings	6,648,293	6,683,662
Other financial liabilities	164,396	186,491
Cash and cash equivalents	2,703,422	1,928,182	₩ 2,900,311	₩ 2,900,311	₩ 2,559,464
Trade and other receivables	6,523,344	6,793,397
Other financial assets	1,617,956	1,727,623
Loans and receivables [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	2,703,422	1,928,182
Trade and other receivables	5,425,996	6,793,397
Other financial assets	484,271	1,333,317
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	777,685	5,813
Derivative used for hedge [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	57,308	93,770
Other financial assets	29,843	7,389
Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets		380,953
Held-to-maturity financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets		151
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	7,758	5,051
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	8,521,379	8,427,457
Borrowings	6,648,293	6,683,662
Other financial liabilities	99,330	₩ 87,670
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other receivables	1,097,348
Other financial assets	₩ 326,157

XML

Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Interest income	₩ 244,796	₩ 93,078	₩ 115,686
Interest expense	(296,874)	(302,464)	(337,219)
Dividend income	11,146	6,212
Total	(116,643)	(150,420)	(308,677)
Other comprehensive income for the year	(54,628)	(68,288)	(5,670)
Reclassified to profit or loss from other comprehensive income for the year	(44,279)	86,479
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on disposal			(632)
Gain (loss) on valuation	(2,708)	(3,078)	33
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on transaction	20,678		8,329
Gain (loss) on valuation	42,195	(145,885)	(138)
Other comprehensive income for the year	(2,810)	(66,624)	4,295
Reclassified to profit or loss from other comprehensive income for the year	(28,388)	91,698	(3,956)
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(296,894)	(302,464)	(337,219)
Gain(loss) on repayment	(15)
Gain (loss) foreign currency transaction	(30,956)	62,347	(7,518)
Gain(loss) foreign currency translation	(66,050)	225,695	(112,864)
Financial assets at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	93,233	108,608	129,813
Gain (loss) foreign currency transaction	19,396	(11,949)	(7,493)
Gain (loss) on foreign currency translation	(2,901)	(12,354)	3,083
Gain (loss) on disposal	44	(20,351)	(15,838)
Gain (loss) on valuation	(110,544)	(44,219)	(92,589)
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	9,194
Dividend income	1,207
Gain (loss) on disposal	1,713
Gain (loss) on valuation	10,768
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	163,390
Dividend income	1,704
Gain (loss) on disposal	(13,818)
Impairment loss	(2,416)
Other comprehensive income for the year	43,811
Asset at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Dividend income		1
Gain (loss) on disposal		153	186
Gain (loss) on valuation		(464)	(7,184)
Derivative financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on transaction	7,272	(58,569)
Gain (loss) on valuation	22,065	(63,640)	109,436
Other comprehensive income for the year	20,078	(44,429)	60,501
Reclassified to profit or loss from other comprehensive income for the year	₩ (15,891)	50,231	(71,915)
Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Interest income		453	40
Dividend income		5,174	3,926
Gain (loss) on disposal		89,598	22,695
Impairment loss		(6,137)	(966)
Other comprehensive income for the year		51,235	10,925
Reclassified to profit or loss from other comprehensive income for the year		₩ (55,450)	(3,840)
Held-to-maturity financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Interest income			₩ 213

XML

Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	₩ 244,796	₩ 93,078	₩ 115,686
Profit and loss from foreign currency transaction	17,175	79,653	24,915
BC Card Co., Ltd. [member]
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	21,021	15,561	14,380
Profit and loss from foreign currency transaction	₩ 20,422	₩ 11,049	₩ (1,987)

XML

Cash and Cash Equivalents to Restricted Cash - Summary of Restricted Cash and Cash Equivalents (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Deposit restricted for governmental project and others	₩ 23,970	₩ 16,837

XML

Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of financial assets [line items]
Trade receivables	₩ 3,054,665		₩ 2,959,622
Other receivables	2,625,684		3,004,943
Trade and other receivables, net	5,680,349	₩ 5,969,040	5,964,565	₩ 5,477,634
Trade receivables	381,681		352,695
Other receivables	461,314		476,137
Trade and other receivables, net	842,995	₩ 826,547	828,832	₩ 709,011
Gross carrying amount [member]
Disclosure of financial assets [line items]
Trade receivables	3,422,086		3,405,947
Other receivables	2,700,792		3,071,532
Trade and other receivables, net	6,122,878		6,477,479
Trade receivables	402,027		366,108
Other receivables	506,061		522,458
Trade and other receivables, net	908,088		888,566
Allowance for doubtful accounts [member]
Disclosure of financial assets [line items]
Trade receivables			(438,817)
Other receivables			(66,402)
Trade and other receivables, net			(505,219)
Trade receivables			(610)
Other receivables			(17,970)
Trade and other receivables, net			(18,580)
Expected credit losses [member]
Disclosure of financial assets [line items]
Trade receivables	(357,548)
Other receivables	(74,948)
Trade and other receivables, net	(432,496)
Trade receivables	(2,376)
Other receivables	(18,874)
Trade and other receivables, net	(21,250)
Present value discount [member]
Disclosure of financial assets [line items]
Trade receivables	(9,873)		(7,508)
Other receivables	(160)		(187)
Trade and other receivables, net	(10,033)		(7,695)
Trade receivables	(17,970)		(12,803)
Other receivables	(25,873)		(28,351)
Trade and other receivables, net	₩ (43,843)		₩ (41,154)

XML

Trade and Other Receivables - Summary of Changes in Allowance for Doubtful Accounts (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	₩ 439,427	₩ 470,871	₩ 468,741
Provision	91,282	38,888	84,975
Reversal or written-off	(170,597)	(70,121)	(80,518)
Changes in the scope of consolidation		(107)	215
Others	(188)	(104)	(2,542)
Ending balance	359,924	439,427	470,871
Other receivables [member]
Disclosure of financial assets [line items]
Beginning balance	84,372	141,616	250,842
Provision	21,783	5,809	7,736
Reversal or written-off	(14,520)	(61,220)	(108,638)
Changes in the scope of consolidation		(35)	56
Others	2,187	(1,798)	(8,380)
Ending balance	₩ 93,822	₩ 84,372	₩ 141,616

XML

Trade and Other Receivables - Summary of Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of financial assets [line items]
Receivables	₩ 6,523,344	₩ 6,793,397
Other receivables [member]
Disclosure of financial assets [line items]
Loans	88,476	84,682
Receivables	2,612,753	3,000,849
Accrued income	10,171	12,186
Refundable deposits	370,481	391,458
Loans receivable	54,952	34,273
Finance lease receivables	22,230	20,526
Others	21,757	21,478
Less Allowance for doubtful accounts	(93,822)	(84,372)	₩ (141,616)	₩ (250,842)
Other receivables	₩ 3,086,998	₩ 3,481,080

XML

Trade and Other Receivables - Summary of Other Receivables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
BC Card Co., Ltd. [member]
Disclosure of financial assets [line items]
Settlement receivable included in other receivables	₩ 1,895,575	₩ 2,262,829

XML

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Other financial assets
Financial assets at amortized cost	₩ 484,271	₩ 1,333,368
Financial assets at fair value through profit or loss	777,685	5,913
Financial assets at fair value through other comprehensive income	326,157
Available-for-sale financial assets		380,953
Derivative used for hedging	29,843	7,389
Less: Non-current	(623,176)	(754,992)	₩ (664,726)
Current	994,780	972,631	720,555
Other financial liabilities
Financial liabilities at amortized cost	99,330	87,669
Financial liabilities at fair value through profit or loss	7,758	5,051
Derivatives used for hedging	57,308	93,771
Less: Non-current	(163,454)	(149,267)	(108,431)
Current	₩ 942	₩ 37,224	₩ 233

XML

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Other financial assets	₩ 1,617,956	₩ 1,727,623
Ustream Inc. [member]
Disclosure of detailed information about financial instruments [line items]
Proceeds from the disposal of Subsidiary	60,978	₩ 59,660
Money Market Wrap and Money Market Trust [member] | Ustream Inc. [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	₩ 610,862

XML

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [line items]
Equity Instruments	₩ 777,685	₩ 5,913
Less: non-current	(269,148)
Current	508,537
Equity Instruments Listed [member]
Disclosure of financial assets [line items]
Equity Instruments	121
Equity Instruments Unlisted [member]
Disclosure of financial assets [line items]
Equity Instruments	62,911
Debt securities [member]
Disclosure of financial assets [line items]
Equity Instruments	₩ 714,653

XML

Other Financial Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Available-for-sales financial assets at fair value through profit or loss	₩ 94,531
Available-for-sales classified as financial assets at fair value through other comprehensive income	257,819
Ineffective portion recognized in profit or loss cash flow hedge valuation gain	263	₩ 1,961	₩ 1,637
Korea software financial cooperative [member]
Disclosure of detailed information about financial instruments [line items]
Available-for-sale financial assets investment amount	₩ 1,136

XML

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 326,157
Less: non-current	(326,157)
Current	0
Equity Instruments Listed [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	8,861
Equity Instruments Unlisted [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	310,387
Debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 6,909

XML

Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Assets, Total	₩ 29,843	₩ 7,389
Less: Assets, non-current	(4,732)	(4,675)
Assets, Current	25,111	2,714
Liabilities, Total	57,308	93,771
Less: Liabilities, non-current	(56,366)	(56,547)
Liabilities, Current	942	37,224
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Liabilities, Total	599	2,633
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	29,843	7,389
Liabilities, Total	54,074	81,300
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Liabilities, Total	₩ 2,635	₩ 9,838

XML

Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Valuation gain	₩ 66,305	₩ 57	₩ 109,436
Valuation loss	2,045	209,582	138
Other comprehensive income	21,651	(146,508)	85,483
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	192	38
Valuation loss			148
Other comprehensive income	(488)	637	(142)
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	58,912	19	97,158
Valuation loss	2,045	187,468	(10)
Other comprehensive income	22,139	(146,752)	85,479
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain	₩ 7,201		12,278
Valuation loss		22,114
Other comprehensive income		₩ (393)	₩ 146

XML

Other Financial Assets and Liabilities - Summary of Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	₩ 7,758	₩ 5,051

XML

Other Financial Assets and Liabilities - Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 7,758	₩ 5,051
Valuation loss on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 2,707	₩ 3,078

XML

Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of inventories [line items]
Inventories	₩ 1,074,634	₩ 642,027	₩ 642,027	₩ 454,588
Merchandise [member]
Disclosure of inventories [line items]
Inventories	680,439		446,028
Others [member]
Disclosure of inventories [line items]
Inventories	394,195		195,999
Gross carrying amount [member]
Disclosure of inventories [line items]
Inventories	1,188,215		700,320
Gross carrying amount [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	794,020		504,321
Gross carrying amount [member] | Others [member]
Disclosure of inventories [line items]
Inventories	394,195		195,999
Valuation allowance [member]
Disclosure of inventories [line items]
Inventories	(113,581)		(58,293)
Valuation allowance [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	₩ (113,581)		₩ (58,293)

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Inventories - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Classes of current inventories [abstract]
Inventories recognised as expense	₩ 3,926,199	₩ 3,855,089	₩ 3,589,809
Valuation loss and reversal of valuation loss	₩ 55,288	₩ 11,165	₩ (20,223)

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Other Assets and Liabilities - Summary of Other Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Other assets
Advance payments	₩ 162,784		₩ 164,950
Prepaid expenses	1,667,372		241,078
Contract assets	398,797
Others	4,490		5,997
Less: Non-current	(545,895)	₩ (529,783)	(107,165)	₩ (106,099)
Current	1,687,548	1,589,293	304,860	311,135
Other liabilities
Advances received	518,914		375,792
Withholdings	89,403		85,142
Unearned revenue	39,528		23,036
Contract liabilities	347,462
Others	24,908		11,628
Less: Non-current	(423,626)	(286,783)	(237,284)	(58,761)
Current	₩ 596,589	₩ 494,079	₩ 258,314	₩ 342,291

XML

Assets Held for Sale - Additional Information (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Disclosure Of Assets Held For Sale [abstract]
Assets held for sale	₩ 13,035

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Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	₩ 13,562,319	₩ 14,312,111
Acquisition and capital expenditure	2,287,630	2,631,431
Disposal and termination	(124,542)	(196,138)
Depreciation	(2,690,760)	(2,755,236)
Impairment	(15,893)	(9,285)
Transfer in (out)	1,024	(310,687)
Inclusion in scope of consolidation	6,798
Exclusion from scope of consolidation		(945)
Transfer from(to) investment properties	39,363	(61,472)
Others	2,318	(47,460)
Ending, net	13,068,257	13,562,319
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	43,626,804	43,133,769
Ending, net	44,289,629	43,626,804
Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(30,064,485)	(28,821,658)
Ending, net	(31,221,372)	(30,064,485)
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,268,657	1,308,952
Acquisition and capital expenditure	9,897	1,948
Disposal and termination	(3,718)	(4,656)
Transfer in (out)	7,663	26,764
Transfer from(to) investment properties	(3,080)	(64,449)
Others	1,768	98
Ending, net	1,281,187	1,268,657
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,268,789	1,309,084
Ending, net	1,281,319	1,268,789
Land [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(132)	(132)
Ending, net	(132)	(132)
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	2,012,422	2,124,732
Acquisition and capital expenditure	1,728	120
Disposal and termination	(2,640)	(4,022)
Depreciation	(132,353)	(135,242)
Impairment	(5,551)
Transfer in (out)	127,052	25,305
Inclusion in scope of consolidation	44
Exclusion from scope of consolidation		(19)
Transfer from(to) investment properties	5,366	1,793
Others	1,617	(245)
Ending, net	2,007,685	2,012,422
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	3,750,861	3,729,228
Ending, net	3,873,074	3,750,861
Buildings [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,738,439)	(1,604,496)
Ending, net	(1,865,389)	(1,738,439)
Machinery and equipment1 [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	9,060,809	9,260,185
Acquisition and capital expenditure	137,088	237,218
Disposal and termination	(113,266)	(176,085)
Depreciation	(2,398,782)	(2,469,459)
Impairment	(1,237)	(9,256)
Transfer in (out)	1,767,878	2,227,808
Inclusion in scope of consolidation	4,228
Exclusion from scope of consolidation		(772)
Others	18,298	(8,830)
Ending, net	8,475,016	9,060,809
Machinery and equipment1 [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	35,971,877	35,106,184
Ending, net	36,327,007	35,971,877
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(26,911,068)	(25,845,999)
Ending, net	(27,851,991)	(26,911,068)
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	506,838	524,923
Acquisition and capital expenditure	101,832	129,464
Disposal and termination	(4,336)	(8,242)
Depreciation	(159,625)	(150,535)
Impairment	(8,935)	(1)
Transfer in (out)	9,525	10,344
Inclusion in scope of consolidation	2,526
Exclusion from scope of consolidation		(120)
Transfer from(to) investment properties	37,077	1,184
Others	(6,521)	(179)
Ending, net	478,381	506,838
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,920,571	1,895,332
Ending, net	1,981,646	1,920,571
Others [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,413,733)	(1,370,409)
Ending, net	(1,503,265)	(1,413,733)
Construction-in-progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	713,593	1,093,319
Acquisition and capital expenditure	2,037,085	2,262,681
Disposal and termination	(582)	(3,133)
Impairment	(170)	(28)
Transfer in (out)	(1,911,094)	(2,600,908)
Exclusion from scope of consolidation		(34)
Others	(12,844)	(38,304)
Ending, net	825,988	713,593
Construction-in-progress [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	714,706	1,093,941
Ending, net	826,583	714,706
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,113)	(622)
Ending, net	₩ (595)	₩ (1,113)

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Property and Equipment - Summary of the Details of Property and Equipment Provided (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 6,648,293	₩ 6,683,662
Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	13,163	13,115
Secured amount	₩ 15,113	₩ 15,995
Related line item	Borrowings	Borrowings
Related amount	₩ 7,878	₩ 2,730
Secured party	Standard Chartered Bank, Korea Development Bank	Standard Chartered Bank, Korea Development Bank
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	₩ 50,278	₩ 53,757
Secured amount	40,252	38,570
Related amount	₩ 10,063	₩ 16,071
Secured party	Shinhan Bank	Shinhan Bank

XML

Property and Equipment - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Borrowing cost capitalized	₩ 7,329	₩ 8,473
Interest rate of capitalized borrowing cost	3.22%
Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Interest rate of capitalized borrowing cost		3.37%
Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Interest rate of capitalized borrowing cost		3.54%

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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 1,189,531	₩ 1,148,044
Acquisition	75,263	48,850
Disposal and termination	(14,967)	(9,927)
Depreciation	(44,653)	(47,295)
Transfer from(to) property and equipment	(39,363)	61,472
Transfer and others	(74,727)	(11,613)
Ending balance	1,091,084	1,189,531
Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,590,018	1,501,400
Ending balance	1,518,917	1,590,018
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(400,487)	(353,356)
Ending balance	(427,833)	(400,487)
Land [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	356,790	302,750
Acquisition	1,111
Disposal and termination	(4,729)	(3,493)
Transfer from(to) property and equipment	3,080	64,449
Transfer and others	(7,404)	(6,916)
Ending balance	348,848	356,790
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	358,358	302,750
Ending balance	350,417	358,358
Land [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(1,568)
Ending balance	(1,569)	(1,568)
Buildings [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	792,768	766,529
Acquisition	7	775
Disposal and termination	(10,238)	(6,434)
Depreciation	(44,653)	(47,295)
Transfer from(to) property and equipment	(5,366)	(1,793)
Transfer and others	9,597	80,986
Ending balance	742,115	792,768
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,191,687	1,119,885
Ending balance	1,168,379	1,191,687
Buildings [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(398,919)	(353,356)
Ending balance	(426,264)	(398,919)
Investment property, construction-in-progress [Member]
Disclosure of detailed information about investment property [line items]
Beginning balance	39,973	78,765
Acquisition	74,145	48,075
Transfer from(to) property and equipment	(37,077)	(1,184)
Transfer and others	(76,920)	(85,683)
Ending balance	121	39,973
Investment property, construction-in-progress [Member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	39,973	78,765
Ending balance	₩ 121	₩ 39,973

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Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about investment property [abstract]
Fair value of investment properties	₩ 1,821,061	₩ 1,755,600
Rental income from investment properties	₩ 207,795	₩ 205,993

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Investment Properties - Summary of Investment Properties Provided as Collateral (Detail) - Land and buildings [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Deposits 1 [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	₩ 548,567	₩ 583,778
Secured amount	₩ 66,551	₩ 74,963
Related account	Deposits	Deposits
Related amount	₩ 59,492	₩ 63,923
Borrowings [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	5,292	7,897
Secured amount	₩ 3,987	₩ 7,905
Related account	Borrowings	Borrowings
Related amount	₩ 3,322	₩ 5,270

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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Beginning, net	₩ 2,632,704	₩ 3,022,803
Acquisition and capital expenditure	1,331,172	386,711
Disposal and termination	(15,417)	(27,213)
Amortization	(629,526)	(635,150)	₩ (599,721)
Impairment	(12,996)	(116,095)
Inclusion in scope of consolidation	93,719
Exclusion in scope of consolidation		(4,922)
Others	7,468	6,570
Ending, net	3,407,123	2,632,704	3,022,803
Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	6,714,014	6,500,489
Ending, net	8,064,270	6,714,014	6,500,489
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(4,081,310)	(3,477,686)
Ending, net	(4,657,147)	(4,081,310)	(3,477,686)
Goodwill [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	168,880	253,486
Impairment	(518)	(84,606)
Inclusion in scope of consolidation	67,696
Ending, net	236,058	168,880	253,486
Goodwill [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	474,908	492,105
Ending, net	542,074	474,908	492,105
Goodwill [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(306,028)	(238,619)
Ending, net	(306,016)	(306,028)	(238,619)
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	418,559	334,676
Acquisition and capital expenditure	56,670	247,863
Disposal and termination	(3,436)	(14,806)
Amortization	(147,304)	(151,718)
Exclusion in scope of consolidation		(332)
Others	10,621	2,876
Ending, net	335,110	418,559	334,676
Development costs [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,643,886	1,483,205
Ending, net	1,680,372	1,643,886	1,483,205
Development costs [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,225,327)	(1,148,529)
Ending, net	(1,345,262)	(1,225,327)	(1,148,529)
Software [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	190,241	197,138
Acquisition and capital expenditure	29,800	60,475
Disposal and termination	(736)	(548)
Amortization	(72,185)	(73,174)
Impairment	(222)	(3)
Inclusion in scope of consolidation	2,073
Exclusion in scope of consolidation		(3,216)
Others	16,973	9,569
Ending, net	165,944	190,241	197,138
Software [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	893,500	838,532
Ending, net	947,312	893,500	838,532
Software [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(703,259)	(641,394)
Ending, net	(781,368)	(703,259)	(641,394)
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,364,942	1,677,289
Acquisition and capital expenditure	1,110,865
Disposal and termination	(558)
Amortization	(318,815)	(311,146)
Others	66	(1,201)
Ending, net	2,156,500	1,364,942	1,677,289
Frequency usage rights [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	2,530,341	2,531,654
Ending, net	3,641,231	2,530,341	2,531,654
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,165,399)	(854,365)
Ending, net	(1,484,731)	(1,165,399)	(854,365)
Others [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	490,081	560,214
Acquisition and capital expenditure	133,837	78,373
Disposal and termination	(10,687)	(11,859)
Amortization	(91,222)	(99,112)
Impairment	(12,256)	(31,486)
Inclusion in scope of consolidation	23,950
Exclusion in scope of consolidation		(1,374)
Others	(20,192)	(4,674)
Ending, net	513,511	490,081	560,214
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,171,378	1,154,993
Ending, net	1,253,281	1,171,378	1,154,993
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(681,297)	(594,779)
Ending, net	₩ (739,770)	₩ (681,297)	₩ (594,779)

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Intangible Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]
Indefinite useful life	₩ 239,619	₩ 238,053
Description of calculation of recoverable amount	the recoverable amounts of Satellite TV segment are calculated based on value-in use calculations or fair value less costs to sell. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five year. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate (-0.77%) based on past performance and its expectation of future market changes. The Group determined cash flow projections based on past performance and its estimation of market growth. Specific risk of related operating segment was reflected in its 13.25% discount rate.
Impairment loss on indefinite-lived intangible assets	₩ 12,997	₩ 116,095	₩ 135,264
Satellite TV segment [member]
Disclosure of detailed information about intangible assets [line items]
Annual growth rate	0.00%
Expected revenue growth rate	(0.77%)
Discount rate	13.25%
Impairment loss on goodwill	₩ 78,200
Impairment loss on indefinite-lived intangible assets	29,325
Frequency usage rights for 3.5GHz band [member] | Assignment of radio frequencies [member]
Disclosure of detailed information about intangible assets [line items]
Purchase consideration	₩ 968,000
Consideration payment period	10 years
Frequency usage rights for twenty 28GHz band [member] | Assignment of radio frequencies [member]
Disclosure of detailed information about intangible assets [line items]
Purchase consideration	₩ 207,800
Consideration payment period	5 years

XML

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 236,058
Telecom Wireless Business [member] | Marketing [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	65,057
BC Card Co., Ltd. [member] | Finance [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	41,234
GENIE Music Corporation K T Music Corporation [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	55,114
PlayD Co., Ltd. (N SEARCH MARKETING Corporation) [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	42,745
KT Telecop Co., Ltd. [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	15,418
KT MOS Bukbu Co Ltd and others [member] | Others [member]
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 16,490

XML

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Parenthetical) (Detail) - KRW (₩)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]
Description of calculation of recoverable amount	the recoverable amounts of Satellite TV segment are calculated based on value-in use calculations or fair value less costs to sell. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five year. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate (-0.77%) based on past performance and its expectation of future market changes. The Group determined cash flow projections based on past performance and its estimation of market growth. Specific risk of related operating segment was reflected in its 13.25% discount rate.
Marketing [member] | Telecom Wireless Business [member]
Disclosure of detailed information about intangible assets [line items]
Annual growth rate	0.00%
Expected revenue growth rate	1.34%
Discount rate	7.53%
Impairment loss on goodwill	₩ 0	₩ 0
Description of calculation of recoverable amount	The recoverable amounts of mobile business are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five year. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 1.34% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 7.53% used reflected specific risks relating to the relevant CGUs
Finance [member] | BC Card Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Annual growth rate	0.00%
Expected revenue growth rate	2.80%
Discount rate	15.53%
Impairment loss on goodwill	₩ 0	0
Description of calculation of recoverable amount	The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 0.0% was applied for the cash flows expected to be incurred after five year. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 2.80% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 15.53% used reflected specific risks relating to the relevant CGUs.
Others [member] | PlayD Co., Ltd. (N SEARCH MARKETING Corporation) [member]
Disclosure of detailed information about intangible assets [line items]
Annual growth rate	1.00%
Expected revenue growth rate	5.44%
Discount rate	10.42%
Impairment loss on goodwill	₩ 0	₩ 0
Description of calculation of recoverable amount	The recoverable amounts of PlayD Co., Ltd. (N search Marketing Co., Ltd.) are calculated based on value-in use calculations. These calculations use cash flow projections for the next five years based on financial budgets. An annual growth rate of 1.0% was applied for the cash flows expected to be incurred after five year. This growth rate does not exceed the long-term average growth rate of the industry which the cash-generate unit belongs in. The Group estimated its revenue growth rate 5.44% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 10.42% used reflected specific risks relating to the relevant CGUs.

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Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Korea Information & Technology Fund [member]
Disclosure of associates [line items]
Percentage of ownership	33.30%	33.30%
Location	Korea
Date of financial statements	--12-31
KT-SB Venture Investment Fund [member]
Disclosure of associates [line items]
Percentage of ownership	50.00%	50.00%
Location	Korea
Date of financial statements	--12-31
KT-IBKC future investment fund [member]
Disclosure of associates [line items]
Percentage of ownership	50.00%	50.00%
Location	Korea
Date of financial statements	--12-31
KT-CKP New Media Investment Fund [member]
Disclosure of associates [line items]
Percentage of ownership	49.70%	49.70%
Location	Korea
Date of financial statements	--12-31
K Bank Inc. [member]
Disclosure of associates [line items]
Percentage of ownership	10.00%	10.00%
Location	Korea
Date of financial statements	--12-31

XML

Investments in Associates and Joint Ventures - Summary of Details of Associates (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
K Bank Inc. [member]
Disclosure of associates [line items]
Percentage of non-voting convertible stock are excluded	8.80%	8.00%

XML

Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	₩ 279,431	₩ 284,075
Acquisition (Disposal)	26,912	(19,018)
Share of net profit from associates and joint ventures	5,912	(15,480)
Impairment		(3,662)
Others	(39,848)	33,516
Ending	272,407	279,431
Korea Information & Technology Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	139,534	134,969
Share of net profit from associates and joint ventures	15,037	4,275
Others	(6,316)	290
Ending	148,255	139,534
KT-SB Venture Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	2,942	4,736
Acquisition (Disposal)		(1,069)
Share of net profit from associates and joint ventures	1,528	(725)
Ending	4,470	2,942
Mongolian Telecommunications [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning		6,244
Share of net profit from associates and joint ventures		(348)
Others		(5,896)
KT Wibro Infra Co., Ltd. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning		52,200
Acquisition (Disposal)		(52,200)
KT-CKP New Media Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	2,294	4,454
Acquisition (Disposal)	(1,229)	(2,970)
Share of net profit from associates and joint ventures	(784)	810
Ending	281	2,294
Others [Member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	81,728	77,851
Acquisition (Disposal)	2,466	3,178
Share of net profit from associates and joint ventures	8,607	(1,952)
Impairment		(3,662)
Others	(36,016)	6,313
Ending	56,785	81,728
KT-IBKC future investment fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	10,825	3,621
Acquisition (Disposal)	(1,050)	7,500
Share of net profit from associates and joint ventures	1,028	(296)
Others	(842)
Ending	9,961	10,825
K Bank Inc. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Beginning	42,108
Acquisition (Disposal)	26,725	26,543
Share of net profit from associates and joint ventures	(19,504)	(17,244)
Others	3,326	32,809
Ending	₩ 52,655	₩ 42,108

XML

Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Share gain from associates and joint ventures	₩ (5,467)	₩ (13,892)	₩ 2,599
KT Investment Co., Ltd. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Share gain from associates and joint ventures	₩ 445	₩ 1,588

XML

Investments in Associates and Joint Ventures - Summary of Financial Information of Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	₩ 12,157,814	₩ 9,828,525		₩ 11,117,433	₩ 9,866,302
Non-current assets	20,316,306	20,067,196		20,135,256	20,948,278
Current liabilities	9,394,123	9,474,162		9,744,055	9,539,195
Non-current liabilities	8,421,507	7,238,205		₩ 7,318,441	₩ 8,358,443
Operating revenue	23,436,050	23,546,929	₩ 23,164,202
Profit (loss) for the year	719,412	546,341	831,845
Other comprehensive income	(54,628)	(68,288)	(5,670)
Total comprehensive income	664,784	478,053	₩ 826,175
Korea Information & Technology Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	118,024	144,874
Non-current assets	326,740	273,727
Operating revenue	59,524	36,462
Profit (loss) for the year	45,110	12,825
Other comprehensive income	(13,422)	1,868
Total comprehensive income	31,688	14,693
Dividends received from associates	1,842	739
KT-SB Venture Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	4,322	120
Non-current assets	4,624	5,770
Current liabilities	6	6
Operating revenue		3
Profit (loss) for the year	3,056	(1,449)
Total comprehensive income	3,056	(1,449)
KT-IBKC future investment fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	19,922	5,499
Non-current assets		16,302
Current liabilities		152
Operating revenue	2,665	15
Profit (loss) for the year	2,057	(593)
Total comprehensive income	2,057	(593)
KT-CKP New Media Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	25	287
Non-current assets	540	4,333
Operating revenue	371	1,593
Profit (loss) for the year	(629)	1,632
Total comprehensive income	(629)	1,632
K Bank Inc. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Current assets	2,094,152	1,258,969
Non-current assets	90,505	92,137
Current liabilities	1,901,389	1,116,154
Non-current liabilities	3,185	1,177
Operating revenue	66,787	20,926
Profit (loss) for the year	(79,671)	(83,787)
Other comprehensive income	1,432	(746)
Total comprehensive income	₩ (78,440)	₩ (84,533)

XML

Investments in Associates and Joint Ventures - Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Book amount	₩ 272,407	₩ 279,431	₩ 284,075
K Bank Inc. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Net assets	₩ 280,083	₩ 233,775
Percentage of ownership	10.00%	10.00%
Share in net assets	₩ 52,655	₩ 42,108
Book amount	52,655	42,108
Korea Information & Technology Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Net assets	₩ 444,764	₩ 418,601
Percentage of ownership	33.30%	33.30%
Share in net assets	₩ 148,255	₩ 139,534
Book amount	148,255	139,534
KT-SB Venture Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Net assets	₩ 8,940	₩ 5,884
Percentage of ownership	50.00%	50.00%
Share in net assets	₩ 4,470	₩ 2,942
Book amount	4,470	2,942
KT-IBKC future investment fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Net assets	₩ 19,922	₩ 21,649
Percentage of ownership	50.00%	50.00%
Share in net assets	₩ 9,961	₩ 10,825
Book amount	9,961	10,825
KT-CKP New Media Investment Fund [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Net assets	₩ 565	₩ 4,620
Percentage of ownership	49.70%	49.70%
Share in net assets	₩ 280	₩ 2,294
Book amount	₩ 280	₩ 2,294

XML

Investments in Associates and Joint Ventures - Summary of Reconciliation of Carrying Amount of Interests in the Associates and Joint Ventures (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
K Bank Inc. [member]
Disclosure of information about unconsolidated structured entities controlled by investment entity [line items]
Percentage of non-voting convertible stock are excluded	8.80%	8.00%

XML

Investments in Associates and Joint Ventures - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of associates [abstract]
Loss from associates and joint ventures not recognized	₩ 1,908	₩ 4,391
Accumulated comprehensive loss of associates and joint ventures not recognized	₩ 6,475	₩ 17,045

XML

Trade and Other Payables - Summary of Trade and Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Current liabilities
Trade payables	₩ 1,236,489		₩ 1,399,287
Other payables	5,771,026		6,026,801
Total	7,007,515	₩ 7,426,385	7,426,088	₩ 7,141,725
Non-current liabilities
Trade payables	3,207		4,787
Other payables	1,510,657		996,582
Total	₩ 1,513,864		₩ 1,001,369	₩ 1,188,311

XML

Trade and Other Payables - Summary of Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Trade and other payables [abstract]
Non-trade payables	₩ 5,191,268	₩ 4,775,177
Accrued expenses	904,135	1,011,089
Operating deposits	819,968	850,999
Others	366,312	386,118
Less: non-current	(1,510,657)	(996,582)
Current	₩ 5,771,026	₩ 6,026,801

XML

Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trade and other payables [abstract]
Settlement payables related to credit card transaction	₩ 1,996,320	₩ 2,365,477

XML

Borrowings - Summary of Borrowings (Detail) ¥ in Thousands, $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Less: Current portion	₩ (1,368,481)			₩ (1,573,474)			₩ (1,820,001)
Borrowings	6,648,293			6,683,662
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 6,668,349
Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 07, 2034
Annual interest rates	6.50%	6.50%	6.50%
Gross carrying amount [member] | Aug. 28, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 28, 2018
Gross carrying amount [member] | Apr. 22, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 22, 2019
Annual interest rates	2.63%	2.63%	2.63%
Gross carrying amount [member] | Jan. 29, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2018
Gross carrying amount [member] | Feb. 23, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Feb. 23, 2018
Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 18, 2026
Annual interest rates	2.50%	2.50%	2.50%
Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug 07, 2022
Annual interest rates	2.63%	2.63%	2.63%
Gross carrying amount [member] | Aug 23, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug 23, 2020
Annual interest rates description	LIBOR(3M)+0.40%
Annual interest rates adjustment rate	0.40%	0.40%	0.40%
Gross carrying amount [member] | Aug 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug 23, 2023
Annual interest rates description	LIBOR(3M)+0.90%
Annual interest rates adjustment rate	0.90%	0.90%	0.90%
Gross carrying amount [member] | July 06, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 06, 2020
Annual interest rates	0.31%	0.31%	0.31%
Gross carrying amount [member] | July 06, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 06, 2021
Annual interest rates	0.38%	0.38%	0.38%
Gross carrying amount [member] | Nov 13, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov 13, 2020
Annual interest rates	0.30%	0.30%	0.30%
Gross carrying amount [member] | Aug. 06, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 06, 2018
Gross carrying amount [member] | Mar. 29, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Mar. 29, 2018
Gross carrying amount [member] | Apr. 26, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 26, 2021
Annual interest rates	4.71%	4.71%	4.71%
Gross carrying amount [member] | Aug. 26, 2016 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 26, 2018
Gross carrying amount [member] | Aug. 26, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 26, 2021
Annual interest rates	4.09%	4.09%	4.09%
Gross carrying amount [member] | Oct. 28, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 28, 2021
Annual interest rates	4.31%	4.31%	4.31%
Gross carrying amount [member] | Dec. 22, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 22, 2021
Annual interest rates	4.09%	4.09%	4.09%
Gross carrying amount [member] | Dec. 22, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Dec. 22, 2031
Annual interest rates	4.27%	4.27%	4.27%
Gross carrying amount [member] | Apr. 10, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2018
Gross carrying amount [member] | Apr. 10, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2023
Annual interest rates	2.95%	2.95%	2.95%
Gross carrying amount [member] | Apr. 10, 2033 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 10, 2033
Annual interest rates	3.17%	3.17%	3.17%
Gross carrying amount [member] | Sept. 16, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 16, 2018
Gross carrying amount [member] | Sept. 16, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 16, 2020
Annual interest rates	3.65%	3.65%	3.65%
Gross carrying amount [member] | June 26, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 26, 2019
Annual interest rates	3.08%	3.08%	3.08%
Gross carrying amount [member] | June 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 26, 2024
Annual interest rates	3.42%	3.42%	3.42%
Gross carrying amount [member] | June 26, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 26, 2034
Annual interest rates	3.70%	3.70%	3.70%
Gross carrying amount [member] | Sept. 02, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 02, 2019
Annual interest rates	2.97%	2.97%	2.97%
Gross carrying amount [member] | Sept. 02, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 02, 2024
Annual interest rates	3.31%	3.31%	3.31%
Gross carrying amount [member] | Sept. 02, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 02, 2034
Annual interest rates	3.55%	3.55%	3.55%
Gross carrying amount [member] | Jan. 29, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2020
Annual interest rates	2.26%	2.26%	2.26%
Gross carrying amount [member] | Jan. 29, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2025
Annual interest rates	2.45%	2.45%	2.45%
Gross carrying amount [member] | Jan. 29, 2035 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2035
Annual interest rates	2.71%	2.71%	2.71%
Gross carrying amount [member] | Jan. 28, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2019
Annual interest rates	1.76%	1.76%	1.76%
Gross carrying amount [member] | Jan. 28, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2021
Annual interest rates	1.95%	1.95%	1.95%
Gross carrying amount [member] | Jan. 28, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2026
Annual interest rates	2.20%	2.20%	2.20%
Gross carrying amount [member] | Jan. 28, 2036 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 28, 2036
Annual interest rates	2.35%	2.35%	2.35%
Gross carrying amount [member] | Jan. 29, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 29, 2021
Annual interest rates	2.55%	2.55%	2.55%
Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2023
Annual interest rates	2.75%	2.75%	2.75%
Gross carrying amount [member] | Jan. 30, 2028 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2028
Annual interest rates	2.95%	2.95%	2.95%
Gross carrying amount [member] | Jan. 30, 2038 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 30, 2038
Annual interest rates	2.93%	2.93%	2.93%
Gross carrying amount [member] | Apr. 22, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 22, 2018
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Less: Current portion	₩ (880,940)			(1,357,776)
Discount on bonds	(20,056)			(19,347)
Borrowings	5,128,649			4,610,453
Debentures [member] | Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	6,029,645			5,987,576
Debentures [member] | Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	111,810		$ 100,000	107,140		$ 100,000
Debentures [member] | Gross carrying amount [member] | Aug. 28, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				321,420		300,000
Debentures [member] | Gross carrying amount [member] | Apr. 22, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	391,335		350,000	374,990		350,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				64,539	¥ 6,800,000
Debentures [member] | Gross carrying amount [member] | Feb. 23, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				142,367	¥ 15,000,000
Debentures [member] | Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	447,240		400,000	428,560		400,000
Debentures [member] | Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	447,240		400,000	428,560		$ 400,000
Debentures [member] | Gross carrying amount [member] | Aug 23, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	223,620		200,000
Debentures [member] | Gross carrying amount [member] | Aug 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	111,810		$ 100,000
Debentures [member] | Gross carrying amount [member] | July 06, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	40,527	¥ 4,000,000
Debentures [member] | Gross carrying amount [member] | July 06, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	162,109	16,000,000
Debentures [member] | Gross carrying amount [member] | Nov 13, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	303,954	¥ 30,000,000
Debentures [member] | Gross carrying amount [member] | Aug. 06, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				100,000
Debentures [member] | Gross carrying amount [member] | Mar. 29, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				260,000
Debentures [member] | Gross carrying amount [member] | Apr. 26, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	380,000			380,000
Debentures [member] | Gross carrying amount [member] | Aug. 26, 2016 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				90,000
Debentures [member] | Gross carrying amount [member] | Aug. 26, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	250,000			250,000
Debentures [member] | Gross carrying amount [member] | Oct. 28, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Dec. 22, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	90,000			90,000
Debentures [member] | Gross carrying amount [member] | Dec. 22, 2031 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	160,000			160,000
Debentures [member] | Gross carrying amount [member] | Apr. 10, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				120,000
Debentures [member] | Gross carrying amount [member] | Apr. 10, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	190,000			190,000
Debentures [member] | Gross carrying amount [member] | Apr. 10, 2033 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Sept. 16, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				200,000
Debentures [member] | Gross carrying amount [member] | Sept. 16, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	300,000			300,000
Debentures [member] | Gross carrying amount [member] | June 26, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000			170,000
Debentures [member] | Gross carrying amount [member] | June 26, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000			110,000
Debentures [member] | Gross carrying amount [member] | June 26, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Sept. 02, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	220,000			220,000
Debentures [member] | Gross carrying amount [member] | Sept. 02, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000			170,000
Debentures [member] | Gross carrying amount [member] | Sept. 02, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	160,000			160,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	240,000			240,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2035 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000			50,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2019 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	130,000			130,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000			100,000
Debentures [member] | Gross carrying amount [member] | Jan. 28, 2036 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000			70,000
Debentures [member] | Gross carrying amount [member] | Jan. 29, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	150,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2038 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 70,000
Debentures [member] | Gross carrying amount [member] | Apr. 22, 2018 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				₩ 60,000

XML

Borrowings - Summary of Borrowings (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Borrowings | ₩	₩ 6,648,293		₩ 6,683,662
Libor rate	2.808%	2.808%
Medium Term Note Programme [member] | Fixed interest rate [member]
Disclosure of detailed information about borrowings [line items]
Borrowings		$ 100,000,000
Medium Term Note Programme [member] | Top of range [member] | Fixed interest rate [member]
Disclosure of detailed information about borrowings [line items]
Borrowings		$ 2,000,000,000

XML

Borrowings - Summary of Short-term Borrowing (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 92,614	₩ 128,300
NongHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	15,000
Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	59,800	113,300
Sinhan Bank, Indonesia [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	614
Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	16,200	12,000
SooHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 1,000	₩ 3,000
Short-term borrowings [member] | NongHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.78%
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.70%
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.72%
Short-term borrowings [member] | Sinhan Bank, Indonesia [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	8.90%
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.50%
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.35%
Short-term borrowings [member] | SooHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.57%

XML

Borrowings - Summary of Long-term Borrowings (Detail) $ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 6,648,293		₩ 6,683,662
Total	₩ 5,279,812		5,110,188		₩ 6,300,790
Shinhan Bank [member] | Vessel facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates adjustment rate	2.808%	2.808%
Kookmin Bank [member] | Vessel facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates adjustment rate	2.808%	2.808%
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 546,090		587,133
Less: Current portion	(394,927)		(87,398)
Total	151,163		499,735
Long-term borrowings [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 30,000		30,000
Long-term borrowings [member] | Export-Import Bank of Korea [member] | Inter-Korean Cooperation Fund [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.50%	1.50%
Borrowings	₩ 3,948		4,688
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.93%	2.93%
Borrowings	₩ 5,000		30,000
Long-term borrowings [member] | Shinhan Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.01%	3.01%
Borrowings	₩ 30,000		6,000
Long-term borrowings [member] | Shinhan Bank [member] | Vessel facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR (3M)+0.706%
Annual interest rates adjustment rate	0.706%	0.706%
Borrowings	₩ 10,063	$ 9,000	16,071	$ 15,000
Long-term borrowings [member] | KEB Hana Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.95%	3.95%
Borrowings			3,000
Long-term borrowings [member] | Standard Charted Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.16%	3.16%
Borrowings	₩ 6,000		8,000
Long-term borrowings [member] | NongHyup Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.86%	2.86%
Borrowings	₩ 8,000		8,000
Long-term borrowings [member] | NongHyup Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.00%	2.00%
Borrowings	₩ 104		123
Long-term borrowings [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.30%	3.30%
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.02%	3.02%
Borrowings	₩ 10,000
Long-term borrowings [member] | Kookmin Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.59%	2.59%
Borrowings			2,333
Long-term borrowings [member] | NH Investment & Security Co., Ltd. [member] | Commercial papers [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.17%	3.17%
Borrowings	₩ 300,000		300,000
Long-term borrowings [member] | Other Financial Instruments [member] | Redeemable convertible preferred stock [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.00%	1.00%
Borrowings	₩ 950		950
Long-term borrowings [member] | Other Financial Instruments [member] | Kookmin Bank and other [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.59%	4.59%
Borrowings	₩ 142,025	$ 127,023	₩ 177,968	$ 166,108

XML

Borrowings - Summary of Long-term Borrowings (Parenthetical) (Detail) - ₩ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2010
Inter-Korean Cooperation Fund [member]
Disclosure of detailed information about borrowings [line items]
Long term debt repayment	The above Inter-Korean Cooperation Fund is repayable in installments over 13 years after a seven-year grace period.
Vessel facility loans [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	2.808%
Vessel facility loans [member] | Kookmin Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	2.808%
Redeemable convertible preferred stock [member]
Disclosure of detailed information about borrowings [line items]
Shares issued		1,900,000
Par value per share		₩ 500

XML

Borrowings - Summary of Repayment of Borrowings Including the Current Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 6,648,293	₩ 6,683,662
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	5,128,649	4,610,453
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	546,090	587,133
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	6,668,349
Gross carrying amount [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	6,029,645	₩ 5,987,576
Gross carrying amount [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	3,790,000
Gross carrying amount [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,239,645
Gross carrying amount [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	638,704
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	486,002
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	152,702
Gross carrying amount [member] | Over 12 months [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,368,876
Gross carrying amount [member] | Over 12 months [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	881,335
Gross carrying amount [member] | Over 12 months [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	490,000
Gross carrying amount [member] | Over 12 months [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	391,335
Gross carrying amount [member] | Over 12 months [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	487,541
Gross carrying amount [member] | Over 12 months [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	436,518
Gross carrying amount [member] | Over 12 months [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	51,023
Gross carrying amount [member] | Between 1-2 years [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,076,623
Gross carrying amount [member] | Between 1-2 years [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,028,101
Gross carrying amount [member] | Between 1-2 years [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	460,000
Gross carrying amount [member] | Between 1-2 years [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	568,101
Gross carrying amount [member] | Between 1-2 years [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	48,522
Gross carrying amount [member] | Between 1-2 years [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,468
Gross carrying amount [member] | Between 1-2 years [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	47,054
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,311,327
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,222,109
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,060,000
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	162,109
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	89,218
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	45,518
Gross carrying amount [member] | Jan 1, 2021 ~ Dec 31, 2021 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	43,700
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	458,683
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	447,240
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	447,240
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	11,443
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	518
Gross carrying amount [member] | Jan 1, 2022 ~ Dec 31, 2022 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	10,925
Gross carrying amount [member] | More than 5 years [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,452,840
Gross carrying amount [member] | More than 5 years [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,450,860
Gross carrying amount [member] | More than 5 years [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,780,000
Gross carrying amount [member] | More than 5 years [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	670,860
Gross carrying amount [member] | More than 5 years [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,980
Gross carrying amount [member] | More than 5 years [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 1,980

XML

Provisions - Summary of Changes in Provisions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017
Disclosure of other provisions [line items]
Beginning balance	₩ 203,030	₩ 197,179
Increase (Transfer)	103,946	48,219
Usage	(17,963)	(26,300)
Reversal	(7,137)	(16,024)
Change in scope of consolidation		(44)
Ending balance	281,876	203,030
Current	117,881	78,172	₩ 78,349	₩ 96,485
Non-current	163,995	124,858		₩ 100,694
Litigation [member]
Disclosure of other provisions [line items]
Beginning balance	18,306	19,038
Increase (Transfer)	44,593	3,842
Usage	(3,002)	(1,740)
Reversal	(1,137)	(2,834)
Ending balance	58,760	18,306
Current	14,513	17,238
Non-current	44,247	1,068
Restoration cost [member]
Disclosure of other provisions [line items]
Beginning balance	100,216	101,312
Increase (Transfer)	25,975	2,827
Usage	(3,181)	(2,178)
Reversal	(4,182)	(1,723)
Change in scope of consolidation		(22)
Ending balance	118,828	100,216
Current	1,736	1,766
Non-current	117,092	98,450
Others [member]
Disclosure of other provisions [line items]
Beginning balance	84,508	76,829
Increase (Transfer)	33,378	41,550
Usage	(11,780)	(22,382)
Reversal	(1,818)	(11,467)
Change in scope of consolidation		(22)
Ending balance	104,288	84,508
Current	101,632	59,168
Non-current	₩ 2,656	₩ 25,340

XML

Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of net defined benefit liability (asset) [abstract]
Present value of defined benefit obligations	₩ 2,201,876	₩ 1,911,166
Fair value of plan assets	(1,643,046)	(1,519,779)
Liabilities	561,269	395,079	₩ 378,404
Assets in the statement of financial position	₩ 2,439	₩ 3,692

XML

Net Defined Benefit Liabilities - Summary of Changes in the Defined Benefit Obligations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ (225,667)	₩ (210,336)	₩ (205,114)
Interest expense	(10,458)	(8,691)	(12,141)
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	1,911,166	1,713,184
Current service cost	225,667	210,336
Interest expense	51,691	38,994
Benefit paid	(121,372)	(154,600)
Changes due to settlements of plan	9,801	(61)
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions	4,600	3,353
Actuarial gains and losses arising from changes in financial assumptions	116,458	36,946
Actuarial gains and losses arising from experience adjustments	(19,919)	63,583
Changes in scope of consolidation	23,784	(569)
Ending balance	₩ 2,201,876	₩ 1,911,166	₩ 1,713,184

XML

Net Defined Benefit Liabilities - Summary of Changes in the Fair Value of Plan Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]
Interest income	₩ (10,458)	₩ (8,691)	₩ (12,141)
Plan assets [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning	1,519,779	1,334,780
Interest income	41,233	30,303
Remeasurements:
Return on plan assets (excluding amounts included in interest income)	1,409	(5,557)
Benefits paid	(116,303)	(130,510)
Employer contributions	179,100	290,895
Changes in scope of consolidation	17,828	(132)
Ending	₩ 1,643,046	₩ 1,519,779	₩ 1,334,780

XML

Net Defined Benefit Liabilities - Summary of Amounts Recognized in the Statement of Profit or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in net defined benefit liability (asset) [abstract]
Current service cost	₩ 225,667	₩ 210,336	₩ 205,114
Net Interest cost	10,458	8,691	12,141
Past service cost	9,801	(61)	424
Transfer out	(13,881)	(9,196)	(8,737)
Total expenses	₩ 232,045	₩ 209,770	₩ 208,942

XML

Net Defined Benefit Liabilities - Summary of Principal Actuarial Assumptions (Detail)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [abstract]
Discount rate	2.77%	2.76%	2.43%
Future salary increase	4.61%	4.51%	4.10%

XML

Net Defined Benefit Liabilities - Summary of Sensitivity of the Defined Benefit Obligations (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line items]
Percentage changes in assumption	0.50%
Effect on defined benefit obligation, increase in assumption	₩ (72,851)
Effect on defined benefit obligation, decrease in assumption	₩ 82,527
Salary growth rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line items]
Percentage changes in assumption	0.50%
Effect on defined benefit obligation, increase in assumption	₩ 75,647
Effect on defined benefit obligation, decrease in assumption	₩ (63,267)

XML

Net Defined Benefit Liabilities - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2019 KRW (₩)	Dec. 31, 2018 yr
Disclosure of net defined benefit liability (asset) [Line Items]
Weighted average duration of the defined benefit obligations | yr		7.4
Subsequent event [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Expected contributions to post-employment benefit plans | ₩	₩ 320,899

XML

Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 5,107,863
Less than 1 year [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	183,106
Between 1-2 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	225,706
Between 2-5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	726,283
More than 5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 3,972,768

XML

Defined Contribution Plan - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Classes of employee benefits expense [abstract]
Defined Contribution plan recognized expenses	₩ 48,210	₩ 45,936	₩ 46,023

XML

Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2018 $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of detailed information about borrowings [line items]
Limit	₩ 2,944,683	$ 232,500
Used amount	606,695	137,180
Bank overdraft [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	1,697,000
Commercial papers [member] | NH Investment & Security Co., Ltd. [member]
Disclosure of detailed information about borrowings [line items]
Limit	300,000
Used amount	300,000
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	37,700
Used amount	3,948
Collateralised loans on electronic receivable-trade [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	495,560
Used amount	70,759
Plus electronic notes payable [member] | Industrial Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	50,000
Used amount	960
Loans for working capital [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	254,300
Used amount	158,000
Facility loans [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		212,000
Used amount | $		127,024
Facility loans [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	10,123
Used amount	8,406
Facility loans on ships [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		9,000
Used amount | $		9,000
Export L C [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Used amount | $		1,156
Derivatives transaction limit [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit	100,000
Used amount	₩ 64,622
FX forward trading commitment [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		$ 11,500

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Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2018 zł in Thousands, $ in Thousands, ₩ in Millions	KRW (₩)	PLN (zł)	USD ($)
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 910,105	zł 23,000	$ 69,346
Performance guarantee [member] | Seoul Guarantee Insurance and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	299,689		1,200
Guarantee for import letters of credit [member] | Industrial Bank of Korea and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $			5,980
Guarantee for payment in korean currency [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	5
Guarantee for payment in foreign currency [member] | KEB Hana Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit		zł 23,000	51,766
Comprehensive credit line [member] | KEB Hana Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	40,000
Comprehensive credit line [member] | KEB Hana Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $			10,000
Bid guarantee [member] | KEB Hana Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	58,992		$ 400
Bid guarantee [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	350
Performance guarantee/Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	376,420
Performance guarantee/Warrant guarantee [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	996
Guarantee for advances received/others [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	124,901
Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	1,037
Guarantees for licensing [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	4,070
Guarantees for public sale [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	120
Guarantees for deposits [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 3,525

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Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Used amount	₩ 6,648,293	₩ 6,683,662
Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Daegu Beomeo-Crossroads SeohanIDaum Buyers
Limit	₩ 8,172
Used amount	₩ 4,271
Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Shinhan Bank
Limit	₩ 538
KT Estate Inc. [member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Busan Gaya Centreville Buyers
Limit	₩ 4,854
Used amount	₩ 2,503
KT Hitel Co., Ltd. [member] | Yonsei University and others [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Korea Software Financial Cooperative
Limit	₩ 34,715
Used amount	₩ 1,616
PT BC card Asia Pacific [member] | Shinhan Bank Indonesia [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	PT BCcard Asia Pacific
Limit	₩ 8,000,000
Used amount	₩ 8,000,000
Bottom of range [member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct 29,2017
Bottom of range [member] | Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr 19,2018
Bottom of range [member] | KT Estate Inc. [member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov 10,2017
Bottom of range [member] | KT Hitel Co., Ltd. [member] | Yonsei University and others [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct 22,2018
Bottom of range [member] | PT BC card Asia Pacific [member] | Shinhan Bank Indonesia [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep 18,2018
Top of range [member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov 30,2020
Top of range [member] | Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr 19,2019
Top of range [member] | KT Estate Inc. [member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct 31,2020
Top of range [member] | KT Hitel Co., Ltd. [member] | Yonsei University and others [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct 22,2021
Top of range [member] | PT BC card Asia Pacific [member] | Shinhan Bank Indonesia [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sep 17,2019

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Commitments and Contingencies - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩) Lawsuits	Dec. 31, 2017 KRW (₩)
Commitments and contingencies [abstract]
Severally liable for reimbursement	₩ 3,480
Number of lawsuits | Lawsuits	172
Litigation settlement claim amount	₩ 169,246	₩ 112,639
Litigation provision	58,776
Collaterally guarantees the debt	₩ 6,000
New town development consortium percentage of ownership interest	2.50%
Contract amount not yet recognized as liabilities	₩ 1,474,009	₩ 622,059

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Lease - Summary of Details of Finance Lease Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of recognised finance lease as assets by lessee [Line Items]
Finance lease assets	₩ 190,811	₩ 199,884
Gross carrying amount [member]
Disclosure of recognised finance lease as assets by lessee [Line Items]
Finance lease assets	343,055	325,975
Accumulated depreciation and amortisation [member]
Disclosure of recognised finance lease as assets by lessee [Line Items]
Finance lease assets	₩ (152,244)	₩ (126,091)

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Lease - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about arrangements involving legal form of lease [abstract]
Depreciation property plant and equipment	₩ 63,070	₩ 58,535
Operating lease expenses incurred	₩ 132,225	₩ 126,250

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Lease - Summary of Details of Future Minimum Lease Payments under Finance Lease Contracts (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]
Total amount of minimum lease payments	₩ 202,192	₩ 220,635
Unrealized interest expense	38,334	43,758
Net amount of minimum lease payments	163,858	176,877
Less than 1 year [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Total amount of minimum lease payments	77,615	88,441
Net amount of minimum lease payments	59,324	68,651
1-5 years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Total amount of minimum lease payments	124,498	132,113
Net amount of minimum lease payments	104,456	108,146
More than 5 years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Total amount of minimum lease payments	79	81
Net amount of minimum lease payments	₩ 78	₩ 80

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Lease - Summary of Details of Future Minimum Lease Payments under Operating Lease Contracts (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [Line Items]
Net amount of minimum lease payments	₩ 373,573	₩ 377,327
Less than 1 year [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Net amount of minimum lease payments	109,025	109,258
1-5 years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Net amount of minimum lease payments	263,395	266,434
More than 5 years [member]
Disclosure of finance lease and operating lease by lessee [Line Items]
Net amount of minimum lease payments	₩ 1,153	₩ 1,635

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Share Capital - Additional Information (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017
Disclosure of classes of share capital [abstract]
Number of authorized shares	1,000,000,000	1,000,000,000

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Share Capital - Summary of Share Capital (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of classes of share capital [Line Items]
Ordinary Shares	₩ 1,564,499	₩ 1,564,499	₩ 1,564,499
Ordinary shares [member]
Disclosure of classes of share capital [Line Items]
Number of outstanding shares	261,111,808	261,111,808
Par value per share	₩ 5,000	₩ 5,000
Ordinary Shares	₩ 1,564,499	₩ 1,564,499

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Share Capital - Summary of Share Capital (Parenthetical) (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017
Disclosure of classes of share capital [abstract]
Treasury shares	51,787,959	51,787,959

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Retained Earnings - Summary of Retained Earnings (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
Miscellaneous equity [abstract]
Legal reserve	₩ 782,249	₩ 782,249
Voluntary reserves	4,651,362	4,651,362
Unappropriated retained earnings	5,822,458	4,527,539
Total	₩ 11,256,069	₩ 9,961,150	₩ 9,778,707	₩ 9,778,707	₩ 9,147,467

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Retained Earnings - Summary of Retained Earnings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017
Miscellaneous equity [abstract]
Minimum percentage of cash dividend declared appropriation to legal reserve	10.00%
Percentage of legal reserve equal to capital stock issued	50.00%

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Accumulated Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016
Total accumulated other comprehensive income	₩ 50,158	₩ 30,985	₩ (1,432)	₩ (1,432)
Changes in investments in associates and joint ventures [member]
Total accumulated other comprehensive income	(871)	(735)		(10,883)
Loss on derivatives valuation [member]
Total accumulated other comprehensive income	(30,474)	(3,463)		(34,309)
Gain on valuation of financial assets at fair value through other comprehensive income [member]
Total accumulated other comprehensive income	96,704	52,673
Gain of valuation on available for sale [member]
Total accumulated other comprehensive income		52,673		54,106
Exchange differences on translation for foreign operations [member]
Total accumulated other comprehensive income	₩ (15,201)	₩ (17,490)		₩ (10,346)

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Beginning	₩ 30,985	₩ (1,432)
Changes in accounting policy	17,741
Increase /decrease	45,711	(54,062)
Reclassified to gain or loss	(44,279)	86,479
Ending	50,158	30,985
Changes in investments in associates and joint ventures [member]
Beginning	(735)	(10,883)
Increase /decrease	(136)	10,148
Ending	(871)	(735)
Loss on derivatives valuation [member]
Beginning	(3,463)	(34,309)
Increase /decrease	17,268	(111,083)
Reclassified to gain or loss	(44,279)	141,929
Ending	(30,474)	(3,463)
Gain on valuation of financial assets at fair value through other comprehensive income [member]
Beginning	52,673
Changes in accounting policy	17,741
Increase /decrease	26,290
Ending	96,704	52,673
Gain of valuation on available for sale [member]
Beginning	52,673	54,106
Increase /decrease		54,017
Reclassified to gain or loss		(55,450)
Ending		52,673
Exchange differences on translation for foreign operations [member]
Beginning	(17,490)	(10,346)
Increase /decrease	2,289	(7,144)
Ending	₩ (15,201)	₩ (17,490)

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Other Components of Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Miscellaneous equity [abstract]
Treasury stock	₩ (830,874)	₩ (853,108)
Gain or loss on disposal of treasury stock	(12,251)	873
Share-based payments	5,956	6,483
Others	(343,914)	(359,550)
Total	₩ (1,181,083)	₩ (1,205,302)	₩ (1,217,934)

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Other Components of Equity (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Miscellaneous equity [abstract]
Number of treasury shares acquired	847,620
Number of treasury shares disposed	895,333
Treasury shares, Amount directly reflected in equity	₩ 653	₩ 5,410

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Miscellaneous equity [abstract]
Number of shares (in shares)	15,967,040	16,014,753
Amounts (In millions of Korean won)	₩ 830,874	₩ 853,108

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Share-based Payments - Summary of Details of Share-based Payments (Detail) - KRW (₩)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Grant date	12th grant August 2, 2018
Vesting conditions	Service condition: 1 year Non-marketperformance condition: achievement of performance
Fair value per option	₩ 28,350
Total compensation costs	₩ 5,956,000,000	₩ 6,483,000,000

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Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	316,949	318,506
Granted	353,325	316,949
Expired	312,181	193,094
Exercised	4,768	125,412
Ending	353,325	316,949
Number of shares exercisable	0	0
10th Grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning		318,506
Expired		193,094
Exercised		125,412
Number of shares exercisable		0
11th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	316,949
Granted		316,949
Expired	312,181
Exercised	4,768
Ending		316,949
Number of shares exercisable	0	0
12th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Granted	353,325
Ending	353,325
Number of shares exercisable	0

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Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Parenthetical) (Detail) - KRW (₩)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Closing price of ordinary shares	₩ 27,300	₩ 31,797

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Explanation of Revenue in Statement of Profit or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 23,012,257
Revenue from other sources	423,793
Operating revenue	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail explanation of Operating revenue (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Mobile services	₩ 6,827,685
Fixed-line services:	4,869,253
Fixed-line and VoIP telephone services	1,708,319
Broadband Internet access services	2,112,763
Data communication services	1,048,171
Media and content	3,182,324
Financial services	3,444,917
Sale of goods	3,288,911
Others	1,822,960
Operating revenue	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Disclosure of revenue from contracts with customers [line items]
Deferred revenue	₩ 39,528		₩ 23,036
Revenue from contracts with customers [member]
Disclosure of revenue from contracts with customers [line items]
Contract assets	398,797	₩ 421,131
Contract liabilities	347,461	282,836
Deferred revenue	₩ 96,198	₩ 88,732

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract Costs Recognized as Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Contract costs recognized as assets	₩ 1,469,855	₩ 1,306,409

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Operating expenses	₩ 1,397,318

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail of Revenue Arising from Carried-Forward Contract Liabilities (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Allocation of the transaction price	₩ 183,905
Deferred revenue of joining/installment fee	39,975
Others	1,536
Total	₩ 225,416

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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit (loss) [abstract]
Salaries and wages	₩ 3,845,842	₩ 3,568,456	₩ 3,477,596
Depreciation	2,674,205	2,745,969	2,762,773
Amortization of intangible assets	607,527	618,533	582,493
Commissions	1,080,168	1,085,865	1,099,429
Interconnection charges	579,613	640,612	690,285
International interconnection fee	226,627	214,058	216,633
Purchase of inventories	4,414,094	4,053,693	3,407,263
Changes of inventories	(432,607)	(187,439)	162,323
Sales commission	1,942,841	2,201,778	1,968,035
Service cost	1,540,869	1,428,405	1,322,337
Utilities	323,411	323,313	323,406
Taxes and dues	285,131	279,574	255,480
Rent	460,377	448,772	455,457
Insurance premium	73,654	69,384	178,231
Installation fee	143,669	146,783	156,669
Advertising expenses	157,675	197,114	185,560
Research and development expenses	176,758	168,635	167,881
Card service cost	3,112,618	3,094,894	3,049,559
Others	1,122,718	1,379,438	1,319,688
Total	₩ 22,335,190	₩ 22,477,837	₩ 21,781,098

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Operating Expenses - Summary of Details of Employee Benefits (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit (loss) [abstract]
Short-term employee benefits	₩ 3,505,214	₩ 3,297,944	₩ 3,206,904
Post-employment benefits(Defined benefit plan)	232,045	209,770	208,942
Post-employment benefits(Defined contribution plan)	48,210	45,936	46,023
Post-employment benefits(Others)	51,934	6,949	8,017
Share-based payment	8,439	7,660	7,710
Total	₩ 3,845,842	₩ 3,568,259	₩ 3,477,596

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Financial Income and Costs - Summary of Details of Financial Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Profit (loss) [abstract]
Interest income	₩ 244,796	₩ 93,078	₩ 115,686
Gain on foreign currency transactions	17,175	79,653	24,915
Gain on foreign currency translation	3,691	225,580	12,165
Gain on settlement of derivatives	27,950		8,515
Gain on valuation of derivatives	66,305	57	109,436
Others	14,326	7,960	25,422
Total	₩ 374,243	₩ 406,328	₩ 296,139

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Financial Income and Costs - Summary of Details of Financial Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Finance Income [line items]
Interest expenses	₩ 296,874	₩ 302,464	₩ 337,219
Loss on foreign currency transactions	49,156	40,303	37,936
Loss on foreign currency translation	72,642	12,239	121,949
Loss on settlement of derivatives		58,569	632
Loss on valuation of derivatives	2,045	209,582	138
Others	1,124	1,010	409
Total	435,659	644,531	515,087
Loans and receivables [member]
Disclosure Of Finance Income [line items]
Loss on disposal of trade receivables	₩ 13,818	20,355	15,838
Available-for-sale [member]
Disclosure Of Finance Income [line items]
Impairment loss on available-for-sale financial assets		₩ 9	₩ 966

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Deferred Income Tax and Income Tax Expense - Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	₩ 465,369	₩ 359,949	₩ 712,222	₩ 701,409
Deferred income tax liabilities	204,785	₩ 135,367	128,462	₩ 137,680
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	1,776,675		1,458,591
Deferred income tax liabilities	1,516,091		874,831
Gross carrying amount [member] | Less than 1 year [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	428,690		318,339
Deferred income tax liabilities	413,409		15,705
Gross carrying amount [member] | Over 12 months [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	1,347,985		1,140,252
Deferred income tax liabilities	₩ 1,102,682		₩ 859,126

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Deferred Income Tax and Income Tax Expense - Summary of Gross Movements on the Deferred Income Tax Account (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets and liabilities [abstract]
Beginning	₩ 583,760	₩ 563,729
Changes in accounting policy	(374,307)
Credited to the statement of profit or loss	15,016	(1,771)	₩ (152,102)
Charged to other comprehensive income	36,115	21,802	1,810
Ending	₩ 260,584	₩ 583,760	₩ 563,729

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Deferred Income Tax and Income Tax Expense - Summary of Movement in Deferred Income Tax Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	₩ 583,760	₩ 563,729
Changes in accounting policy	(374,307)
Statement of operations	15,016	(1,771)	₩ (152,102)
Other comprehensive income	36,115	21,802
Ending	260,584	583,760	563,729
Deferred tax derivative liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(30,520)	(49,188)
Changes in accounting policy	30,520
Statement of operations		49,188
Ending		(30,520)	(49,188)
Deferred tax liabilities available for sale financial assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(30,520)	(31,702)
Statement of operations		(164)
Other comprehensive income		1,346
Ending		(30,520)	(31,702)
Deferred tax liabilities investment in subsidiaries associates and joint ventures [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(96,650)	(50,746)
Statement of operations	2,867	(42,659)
Other comprehensive income	179	(3,245)
Ending	(93,604)	(96,650)	(50,746)
Deferred tax liabilities depreciation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning		(39,498)
Statement of operations	(424)	39,498
Ending	(424)		(39,498)
Deferred tax liabilities advanced depreciation provision [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(248,592)	(225,687)
Statement of operations	(64,592)	(22,905)
Ending	(313,184)	(248,592)	(225,687)
Deferred tax liabilities deposits for severance benefits [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(387,856)	(307,730)
Statement of operations	(11,126)	(80,126)
Ending	(398,982)	(387,856)	(307,730)
Deferred tax liabilities accrued income [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(2,150)	(2,024)
Statement of operations	592	(126)
Ending	(1,558)	(2,150)	(2,024)
Deferred tax liabilities reserve for technology and human resource development [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(314)	(747)
Statement of operations	110	433
Ending	(204)	(314)	(747)
Other deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(108,749)	(119,366)
Statement of operations	(175,506)	10,617
Ending	(284,255)	(108,749)	(119,366)
Deferred tax liabilities prepaid expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Changes in accounting policy	(352,139)
Statement of operations	(17,777)
Ending	(369,916)
Deferred tax derivative assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	24,724
Statement of operations	(26,128)	34,572
Other comprehensive income	9,745	(9,848)
Ending	8,341	24,724
Deferred tax assets provision for impairment or trade receivables [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	121,656	110,276
Changes in accounting policy	(9,096)
Statement of operations	(12,673)	11,380
Ending	99,887	121,656	110,276
Deferred tax assets inventory valuation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning		48
Statement of operations	121	(48)
Ending	121		48
Deferred tax assets contribution for construction [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	18,271	18,091
Statement of operations	(1,471)	180
Ending	16,800	18,271	18,091
Deferred tax assets accrued expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	91,039	80,356
Statement of operations		10,683
Ending		91,039	80,356
Deferred Tax Assets Provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	24,079	20,221
Statement of operations	12,099	3,858
Ending	36,178	24,079	20,221
Deferred tax assets property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	232,074
Statement of operations	(1,796)
Ending	230,278	232,074
Deferred Tax assets assets retirement obligation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	20,836	18,086
Statement of operations	3,696	2,750
Ending	24,532	20,836	18,086
Deferred tax assets withholding of facilities expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	7,382	6,910
Statement of operations	(773)	472
Ending	6,609	7,382	6,910
Deferred tax assets accrued payroll expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	15,129	25,915
Statement of operations		(10,786)
Ending		15,129	25,915
Deferred tax assets deduction of installment receivables [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning		13,887
Statement of operations	42	(13,887)
Ending	42		13,887
Deferred tax assets property and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	232,074	232,915
Statement of operations		(841)
Ending		232,074	232,915
Deferred tax assets gain or loss foreign currency translation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	143	67,701
Statement of operations	10,529	(67,558)
Ending	10,672	143	67,701
Deferred tax assets deferred revenue [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	26,334	26,113
Changes in accounting policy	15,809
Statement of operations	(2,502)	221
Ending	39,641	26,334	26,113
Deferred tax assets real-estate sales [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	8,698	3,851
Changes in accounting policy	661
Statement of operations	12,369	4,847
Ending	21,728	8,698	3,851
Deferred tax assets tax loss carryforward [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	2,699
Statement of operations	1,364	2,699
Ending	4,063	2,699
Other deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	247,702	193,956
Changes in accounting policy	154
Statement of operations	284,742	47,003
Other comprehensive income	(1,049)	6,743
Ending	531,549	247,702	193,956
Deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	1,458,591	1,390,417
Changes in accounting policy	10,418
Statement of operations	304,035	44,473
Other comprehensive income	51,509	23,701
Ending	1,673,777	1,458,591	1,390,417
Deferred tax assets defined benefit liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	467,049	372,492
Statement of operations	3,980	67,751
Other comprehensive income	42,813	26,806
Ending	513,842	467,049	372,492
Deferred tax assets tax credit carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	150,776	199,599
Statement of operations	(47,878)	(48,823)
Ending	102,898	150,776	199,599
Deferred tax liabilities contract assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Changes in accounting policy	(23,663)
Statement of operations	12,158
Ending	(11,505)
Deferred tax liabilities financial assets at fair value through profit or loss [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Changes in accounting policy	(30,856)
Statement of operations	30,195
Ending	(661)
Deferred tax liabilities Financial assets at fair value through other comprehensive income [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Changes in accounting policy	(8,587)
Statement of operations	(17,638)
Other comprehensive income	(15,573)
Ending	(41,798)
Deferred tax assets unsettled expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	106,168
Statement of operations	21,729
Ending	127,897	106,168
Deferred tax assets trade receivables [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Changes in accounting policy	2,890
Statement of operations	(1,293)
Ending	1,597
Temporary differences [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	432,984
Changes in accounting policy	(374,307)
Statement of operations	62,894
Other comprehensive income	36,115
Ending	157,686	432,984
Deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(874,831)	(826,688)
Changes in accounting policy	(384,725)
Statement of operations	(241,141)	(46,244)
Other comprehensive income	(15,394)	(1,899)
Ending	₩ (1,516,091)	₩ (874,831)	₩ (826,688)

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Deferred Income Tax and Income Tax Expense - Summary of Tax Impacts Recognized Directly To Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets and liabilities [abstract]
Loss on valuation of available-for-sale securities, Before recognition		₩ (5,561)	₩ 9,347
Gain on valuation of financial assets at fair value through other comprehensive income, Before recognition	₩ 59,384
Gain (loss) on valuation of hedge instruments (loss)liabilities, Before recognition	(36,756)	40,694	(14,611)
Remeasurements of net defined benefit liabilities, Before recognition	(116,324)	(110,768)	5,558
Share of Gain (loss) of associates and joint ventures, and others, Before recognition	(1,036)	13,410	(641)
Exchange differences on translation for foreign operations, Before recognition	3,989	(27,865)	(7,133)
Total, Before recognition	(90,743)	(90,090)	(7,480)
Loss on valuation of available-for-sale securities, Tax effect		1,346	(2,262)
Gain on valuation of financial assets at fair value through other comprehensive income, Tax effect	(15,573)
Gain (loss) on valuation of hedge instruments (loss)liabilities, Tax effect	9,745	(9,848)	3,536
Remeasurements of net defined benefit liabilities, Tax effect	42,813	26,806	(1,345)
Share of Gain (loss) of associates and joint ventures, and others, Tax effect	179	(3,245)	155
Exchange differences on translation for foreign operations, Tax effect	(1,049)	6,743	1,726
Total, Tax effect	36,115	21,802	1,810
Loss on valuation of available-for-sale securities, After recognition		(4,215)	7,085
Gain on valuation of financial assets at fair value through other comprehensive income, After recognition	43,811
Gain (loss) on valuation of hedge instruments (loss)liabilities, After recognition	(27,011)	30,846	(11,075)
Remeasurements of net defined benefit liabilities, After recognition	(73,511)	(83,962)	4,213
Share of Gain (loss) of associates and joint ventures, and others, After recognition	(857)	10,165	(486)
Exchange differences on translation for foreign operations, After recognition	2,940	(21,122)	(5,407)
Total other comprehensive loss	₩ (54,628)	₩ (68,288)	₩ (5,670)

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Deferred Income Tax and Income Tax Expense - Summary of Details of Income Tax Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets and liabilities [abstract]
Current income tax expense	₩ 329,581	₩ 268,885	₩ 182,088
Impact of change in deferred taxes	(15,016)	1,771	152,102
Income tax expense	₩ 314,565	₩ 270,656	₩ 334,910

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Deferred Income Tax and Income Tax Expense - Summary of Tax on the Group's Profit Before Tax (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets and liabilities [abstract]
Profit before income tax expense	₩ 1,033,977	₩ 816,997	₩ 1,166,755
Statutory income tax expense	273,982	197,251	282,355
Tax effect
Income not taxable for taxation purposes	(85,322)	(19,268)	(28,093)
Non-deductible expenses	18,126	39,746	21,947
Tax credit	(20,319)	(27,211)	(13,764)
Additional payment of income taxes	11,439	976	(4,780)
Tax effect and adjustment on consolidation
Goodwill impairment	137	20,475	31,847
Eliminated dividend income form subsidiaries	31,966	34,305	40,087
Changes of out-side tax effect	618	17,990	(567)
Tax effect of investment in kind	82,820
Others	1,118	6,392	5,878
Income tax expense	₩ 314,565	₩ 270,656	₩ 334,910

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Earnings per Share - Summary of Basic and Diluted Earnings per Share from Operations (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic earnings per share [abstract]
Profit (loss) attributable to ordinary shares	₩ 645,571	₩ 461,559	₩ 745,090
Weighted average number of ordinary shares outstanding	245,049,466	245,017,175	244,892,313
Basic earnings per share (In Korean won)	₩ 2,634	₩ 1,884	₩ 3,043
Profit attributable to ordinary shares (In millions of Korean won)	₩ 645,571	₩ 461,559	₩ 745,090
Adjusted net income attributable to ordinary shares (In millions of Korean won)			(67)
Diluted profit attributable to ordinary shares (In millions of Korean won)	₩ 645,571	₩ 461,559	₩ 745,023
Number of dilutive potential ordinary shares outstanding	1,163	79,880	84,245
Weighted average number of ordinary shares outstanding	245,050,629	245,097,055	244,976,558
Diluted earnings per share (In Korean won)	₩ 2,634	₩ 1,883	₩ 3,041

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Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Dividends [abstract]
Dividends paid	₩ 245,097	₩ 195,977	₩ 122,425
Dividends paid per share	₩ 1,000	₩ 800	₩ 500
Dividends declared	₩ 269,659
Dividends declared per share	₩ 1,100

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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from (used in) operating activities [abstract]
Profit for the year	₩ 719,412	₩ 546,341	₩ 831,845
Adjustments to reconcile net income
Income tax expense	314,565	270,656	334,910
Interest income	(265,817)	(108,639)	(130,066)
Interest expense	296,894	302,464	337,219
Dividends income	(2,910)	(4,785)	(3,926)
Depreciation	2,735,413	2,802,531	2,821,779
Amortization of intangible assets	629,526	635,150	599,721
Provision for severance benefits	245,926	218,966	217,255
Impairment losses on trade receivables	113,064	45,704	92,711
Share of net profit or loss of associates and joint ventures	5,912	15,480	(2,547)
Loss (gain) on disposal of associates and joint ventures	(3,737)	979	(1,450)
Impairment loss of associates and joint ventures		3,662	17,128
Loss on disposal of property and equipment and investment in properties	68,688	150,293	74,913
Loss (gain) on disposal of intangible assets	(4,256)	4,271	7,703
Loss on impairment of intangible assets	12,997	116,095	135,264
Loss on foreign currency translation	68,952	(213,341)	109,784
Loss(gain) on valuation and settlement of derivatives, net	(92,210)	268,094	(117,181)
Gain on disposal of financial assets at fair value through profit or loss	(1,712)
Gain on valuation of financial assets at fair value through profit or loss	(10,768)
Gain on disposal of financial assets at amortized cost	(44)
Impairment losses on available-for-sale financial assets		9	966
Gain on disposal of available-for-sale financial assets		(89,598)	(22,695)
Others	(55,969)	(251,193)	64,863
Changes in operating assets and liabilities
Decrease(increase) in trade receivables	(81,217)	(303,340)	216,818
Decrease(increase) in other receivables	356,643	(346,013)	(779,803)
Decrease(increase) in other current assets	(123,258)	11,792	48,549
Decrease(increase) in other non-current assets	19,556	(43,790)	(51,765)
Decrease(increase) in inventories	(480,543)	(205,403)	167,873
Increase(decrease) in trade payables	(167,841)	162,110	(114,838)
Increase(decrease) in other payables	(448,301)	214,689	706,771
Increase in other current liabilities	291,548	288,553	37,798
Increase in other non-current liabilities	144,072	174,618	30,762
Decrease(Increase) in provisions	85,946	(12,574)	(12,583)
Decrease(Increase) in deferred revenue	48,201	(13,086)	(69,179)
Increase in plan assets	(53,301)	(203,420)	(224,244)
Payment of severance benefits	(153,209)	(118,391)	(121,835)
Cash generated from operations (1+2+3)	₩ 4,212,222	₩ 4,318,884	₩ 5,202,520

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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from (used in) operating activities [abstract]
Interest income recognized as operating revenue	₩ 21,021	₩ 15,561
Interest expense recognized as operating expense	₩ 21	₩ 0

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Cash Generated from Operations - Summary of Significant Transactions not Affecting Cash Flows (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from (used in) operating activities [abstract]
Reclassification of the current portion of borrowings	₩ 1,149,599	₩ 1,416,066	₩ 1,617,175
Reclassification of construction-in-progress to property and equipment	1,988,014	2,686,591	2,212,324
Reclassification of accounts payable from property and equipment	122,185	225,601	91,407
Reclassification of accounts payable from intangible assets	584,595	(227,108)	668,564
Reclassification of payable from defined benefit liability	(31,838)	36,209	5,746
Reclassification of payable from plan assets	₩ (9,497)	₩ 43,035	₩ (9,731)

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Changes in Liabilities Arising from Financing Activities - Summary of Changes in Liabilities Arising from Financial Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	₩ 6,951,971	₩ 8,091,088
Cash flows	(217,061)	(1,164,282)
Newly acquired	61,187	68,938
Exchange difference	10,277	(14,269)
Fair value change	32,390	(30,702)
Scope changes	15,000	(2,206)
Other changes	(6,388)	3,404
Ending	6,847,376	6,951,971
Borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	6,683,662	8,120,791
Cash flows	(139,715)	(1,163,917)
Exchange difference	70,095	(221,495)
Scope changes	15,000	(2,206)
Other changes	19,252	(49,511)
Ending	6,648,294	6,683,662
Financial lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	176,878	180,714
Cash flows	(73,885)	(71,735)
Newly acquired	61,187	68,938
Other changes	(322)	(1,039)
Ending	163,858	176,878
Derivative assets [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	(7,389)	(227,318)
Cash flows	11,126	71,370
Exchange difference	(22,474)	76,552
Fair value change	(3,419)	(2,687)
Other changes	(7,687)	74,694
Ending	(29,843)	(7,389)
Derivative liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	98,820	16,901
Cash flows	(14,587)
Exchange difference	(37,344)	130,674
Fair value change	35,809	(28,015)
Other changes	(17,631)	(20,740)
Ending	₩ 65,067	₩ 98,820

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Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of operating segments [Line Items]
Operating revenues	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202
Operating income (loss)	1,100,860	1,069,092	1,383,104
Depreciation and Amortization	3,281,732	3,364,502	3,345,266
Operating segments [member]
Disclosure of operating segments [Line Items]
Operating revenues	27,172,293	27,217,843	26,742,436
Operating income (loss)	1,153,167	1,112,554	1,421,977
Depreciation and Amortization	3,274,769	3,356,126	3,337,353
Operating segments [member] | Marketing/Customer [member]
Disclosure of operating segments [Line Items]
Operating revenues	14,061,629	16,242,552	16,187,739
Operating income (loss)	886,515	1,018,593	1,093,377
Depreciation and Amortization	2,293,809	2,895,930	2,870,161
Operating segments [member] | Finance [member]
Disclosure of operating segments [Line Items]
Operating revenues	3,560,417	3,637,917	3,577,549
Operating income (loss)	145,463	205,678	208,566
Depreciation and Amortization	22,504	28,827	28,868
Operating segments [member] | Satellite TV [member]
Disclosure of operating segments [Line Items]
Operating revenues	690,821	685,822	668,945
Operating income (loss)	66,735	75,373	79,987
Depreciation and Amortization	98,310	99,216	98,895
Operating segments [member] | Corporate customer business [member]
Disclosure of operating segments [Line Items]
Operating revenues	2,509,880
Operating income (loss)	208,584
Depreciation and Amortization	546,635
Operating segments [member] | Others [member]
Disclosure of operating segments [Line Items]
Operating revenues	6,349,546	6,651,552	6,308,203
Operating income (loss)	(154,130)	(187,090)	40,047
Depreciation and Amortization	313,511	332,153	339,429
Elimination [member]
Disclosure of operating segments [Line Items]
Operating revenues	(3,736,243)	(3,670,914)	(3,578,234)
Operating income (loss)	(52,307)	(43,462)	(38,873)
Depreciation and Amortization	₩ 6,963	₩ 8,376	₩ 7,913

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Segment Information - Summary of Operating Revenues and Non Current Assets by Geographical Regions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [Line Items]
Operating revenues	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202
Non-current assets	17,566,464	17,384,554
Domestic [member]
Disclosure of geographical areas [Line Items]
Operating revenues	23,376,218	23,481,703	23,069,579
Non-current assets	17,426,879	17,246,640
Overseas [member]
Disclosure of geographical areas [Line Items]
Operating revenues	59,832	65,226	₩ 94,623
Non-current assets	₩ 139,585	₩ 137,914

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Related Party Transactions - Summary of Related Parties Outstanding Balances of Receivables and Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Trade receivables [member]
Disclosure of transactions between related parties [line items]
Receivables	₩ 2,078	₩ 2,249
Trade receivables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Receivables	674	778
Trade receivables [member] | MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		17
Trade receivables [member] | MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Trade receivables [member] | MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Trade receivables [member] | MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		6
Trade receivables [member] | MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		17
Trade receivables [member] | MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		34
Trade receivables [member] | MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		2
Trade receivables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Receivables	627	1,338
Trade receivables [member] | NgeneBio [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Trade receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receivables	777	54
Loans and receivables [member]
Disclosure of transactions between related parties [line items]
Receivables	44,570	2,510
Loans and receivables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Receivables	30,910
Loans and receivables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Receivables	12,435
Loans and receivables [member] | NgeneBio [member]
Disclosure of transactions between related parties [line items]
Receivables		2,510
Loans and receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receivables	1,225
Other receivables [member]
Disclosure of transactions between related parties [line items]
Receivables	4	43,369
Other receivables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Receivables		33,800
Other receivables [member] | MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		290
Other receivables [member] | MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Other receivables [member] | MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Other receivables [member] | MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Other receivables [member] | MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Receivables		1
Other receivables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Receivables		7,994
Other receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Receivables	4	1,281
Other payables [member]
Disclosure of transactions between related parties [line items]
Payables	1,412	7,536
Other payables [member] | MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		392
Other payables [member] | MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		1,388
Other payables [member] | MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		1,827
Other payables [member] | MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		287
Other payables [member] | MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		778
Other payables [member] | MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		46
Other payables [member] | MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Payables		384
Other payables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Payables	296	296
Other payables [member] | NgeneBio [member]
Disclosure of transactions between related parties [line items]
Payables		3
Other payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	₩ 1,116	₩ 2,135

XML

Related Party Transactions - Summary of Significant Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [line items]
Sales	₩ 24,312	₩ 37,282	₩ 8,009
Purchases	128,252	156,259	177,666
KT Wibro Infra Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			11
Purchases			391
Smart Channel Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			766
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Sales	2,088	2,233	1,989
Purchases	31,984	35,532	37,469
MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	493	704	663
Purchases	12,023	16,946	17,361
MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	229	335	291
Purchases	8,775	8,514	12,220
MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	540	455	408
Purchases	9,159	15,542	13,469
MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	333	484	412
Purchases	11,549	16,380	15,797
MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	1,378	987	891
Purchases	16,519	21,651	21,802
MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	324	460	441
Purchases	11,193	15,957	15,346
MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales	331	493	418
Purchases	10,499	14,294	14,389
Others [member]
Disclosure of transactions between related parties [line items]
Sales	2,888	1,149	1,719
Purchases	9,547	11,384	₩ 29,422
K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Sales	15,705	29,939
Purchases	7,004	59
NgeneBio [member]
Disclosure of transactions between related parties [line items]
Sales	₩ 3	₩ 43

XML

Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [abstract]
Salaries and other short-term benefits	₩ 2,762	₩ 2,879	₩ 2,629
Post-employment benefits	751	311	381
Stock-based compensation	878	1,331	1,237
Total	₩ 4,391	₩ 4,521	₩ 4,247

XML

Related Party Transactions - Summary of Fund Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [line items]
Equity contributions in cash	₩ 24,713
Equity contributions in cash		₩ 41,851
Dividend income	11,146	6,212
PT. Mitra Transaksi Indonesia [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	1,567
Equity contributions in cash		5,194
KT-IBKC future investment fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(1,050)
Equity contributions in cash		7,500
CHAMP IT Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		750
Korea Electronic Vehicle Charging Service [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	168
Equity contributions in cash		864
Gyeonggi-KT Yoojin Superman Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	1,000
Equity contributions in cash		1,000
K-REALTY CR REIT [member]
Disclosure of transactions between related parties [line items]
Dividend income	8,932	5,392
K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	26,725
Equity contributions in cash		26,543
Korea information & technology investment fund [member]
Disclosure of transactions between related parties [line items]
Dividend income	1,842	739
MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(147)
Dividend income	8	12
MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(147)
Dividend income	8	12
MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(153)
Dividend income	8	12
MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(180)
Dividend income	10	10
MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(203)
Dividend income	12	15
MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(183)
Dividend income	10	10
MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(206)
Dividend income	10	₩ 10
PHI Healthcare Inc [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	1,000
KT-CKP New Media Investment Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(1,229)
KT-DSC creative economy youth start-up investment fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(1,800)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Company [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(3,423)
JB Emerging Market Specialty Investment Private Equity Trust No one[member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	3,960
Dividend income	202
Daiwon Broadcasting Co., Ltd. [Member]
Disclosure of transactions between related parties [line items]
Dividend income	85
Boston Global Film Contents Fund Lp [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	(986)
Gyeonggi KT Green Growth Fund [member]
Disclosure of transactions between related parties [line items]
Dividend income	₩ 19

XML

Financial Risk Management - Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
10% strengthening in foreign exchange rate [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of foreign exchange rate	10.00%	10.00%	10.00%
Income before tax	₩ (2,350)	₩ (10,132)	₩ (28,134)
Shareholders' equity	₩ 633	₩ (7,273)	₩ (23,817)
10% weakening in foreign exchange rate [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of foreign exchange rate	(10.00%)	(10.00%)	(10.00%)
Income before tax	₩ (2,851)	₩ 10,132	₩ 28,134
Shareholders' equity	₩ (62)	₩ 7,273	₩ 23,817
Ten percentage increase in market equity price [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of price	10.00%	10.00%	10.00%
Income before tax	₩ 12
Shareholders' equity	₩ 898	₩ 686	₩ 539
10% decrease in market equity price [member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of price	(10.00%)	(10.00%)	(10.00%)
Income before tax	₩ (12)
Shareholders' equity	₩ (898)	₩ (686)	₩ (539)
100 basis point increase in market interest rate [Member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of interest rate	1.00%	1.00%	1.00%
Income before tax	₩ 1,059	₩ 1,942	₩ (3,456)
Shareholders' equity	₩ 9,689	₩ 4,868	₩ (1,673)
100 basis point decrease in market interest rate [Member]
Disclosure of detailed information about financial instruments [line items]
Fluctuation of interest rate	1.00%	1.00%	1.00%
Income before tax	₩ (1,958)	₩ (1,954)	₩ 3,445
Shareholders' equity	₩ (10,237)	₩ (5,198)	₩ (5,025)

XML

Financial Risk Management - Summary of Details of Financial Assets and Liabilities in Foreign Currencies (Detail) € in Thousands, ₫ in Thousands, ฿ in Thousands, ৳ in Thousands, دج in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, zł in Thousands, Tsh in Thousands, SFr in Thousands, Rp in Thousands, P in Thousands, K in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, in Thousands, in Thousands, in Thousands, ₩ in Millions	Dec. 31, 2018 KRW (₩)	Dec. 31, 2018 BDT (৳)	Dec. 31, 2018 BWP (P)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 DZD (دج)	Dec. 31, 2018 GBP (£)	Dec. 31, 2018 IDR (Rp)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 MMK (K)	Dec. 31, 2018 PLN (zł)	Dec. 31, 2018 RWF (FRw)	Dec. 31, 2018 TZS (Tsh)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 VND (₫)	Dec. 31, 2018 UZS ( )	Dec. 31, 2018 XDR ( )	Dec. 31, 2018 THB (฿)	Dec. 31, 2018 XAF ( )	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 BDT (৳)	Dec. 31, 2017 BWP (P)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 DZD (دج)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 IDR (Rp)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 MMK (K)	Dec. 31, 2017 PLN (zł)	Dec. 31, 2017 RWF (FRw)	Dec. 31, 2017 TZS (Tsh)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 VND (₫)	Dec. 31, 2017 UZS ( )	Dec. 31, 2017 XDR ( )	Dec. 31, 2017 CHF (SFr)	Dec. 31, 2016 BDT (৳)	Dec. 31, 2016 BWP (P)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 DZD (دج)	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 HKD ($)	Dec. 31, 2016 IDR (Rp)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 MMK (K)	Dec. 31, 2016 PLN (zł)	Dec. 31, 2016 RWF (FRw)	Dec. 31, 2016 TZS (Tsh)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 VND (₫)	Dec. 31, 2016 UZS ( )	Dec. 31, 2016 XDR ( )
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,844,722																			₩ 10,387,651
Financial liabilities	₩ 15,334,068																			₩ 15,297,610
Currency risk [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		৳ 39,494	P 897	¥ 16,315	دج 618		Rp 64,240,286	€ 2	¥ 66,078	K 84	zł 26	FRw 857		$ 279,327	₫ 467,272	121,053	267	฿ 1,685	666		৳ 38,074	P 42	¥ 46,555	دج 47		Rp 14,886,393	€ 186	¥ 28,267	K 84	zł 338	FRw 3,346	Tsh 317,348	$ 236,476	₫ 311,649	136,787	306		৳ 69,473	P 15	¥ 15,262	دج 471	£ 1	$ 254	Rp 15,646,011	€ 40	¥ 80,555	K 2,750	zł 106,025	FRw 1,203	Tsh 29,987	$ 210,474	₫ 515,412	39,531	311
Financial liabilities				¥ 271		£ 256	Rp 41,510,330	€ 6	¥ 50,000,000				Tsh 2,876	$ 1,893,782			730	฿ 1,685					¥ 10		£ 74	Rp 710,162	€ 3,625	¥ 21,801,443					$ 1,908,831			738	SFr 12			¥ 381		£ 151		Rp 53,142,167	€ 2,571	¥ 21,802,051					$ 2,536,090			737

XML

Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 10,508,462	₩ 10,220,555
Cash and cash equivalents (except for cash on hand) [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	2,284,885	1,926,620
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	5,425,996	6,793,397
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	1,097,348
Contract assets [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	398,797
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	29,843	7,389
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	714,653	5,813
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	6,909
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	484,271
Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		9,899
Held-to-maturity financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		151
Financial instruments and others [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk		1,333,317
Financial guarantee contracts [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 65,760	₩ 143,969

XML

Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	₩ 8,953,444	₩ 9,264,193
Borrowings(including debentures)	7,554,564	7,607,931
Other non-derivative financial liabilities	175,633	178,113
Financial guarantee contracts	65,760	26,738
Total	16,749,401	17,076,975
Less than 1 year [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	7,287,436	7,882,861
Borrowings(including debentures)	1,507,232	1,623,996
Other non-derivative financial liabilities	6,123	4,117
Financial guarantee contracts	52,734	26,738
Total	8,853,525	9,537,712
1-5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	1,173,579	1,219,835
Borrowings(including debentures)	3,669,060	3,666,726
Other non-derivative financial liabilities	37,358	31,290
Financial guarantee contracts	13,026
Total	4,893,023	4,917,851
More than 5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	492,429	161,497
Borrowings(including debentures)	2,378,272	2,317,209
Other non-derivative financial liabilities	132,152	142,706
Total	₩ 3,002,853	₩ 2,621,412

XML

Financial Risk Management - Summary of Cash Outflow and Inflow of Derivatives Settled Gross or Net are Undiscounted Contractual Cash Flow (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	₩ 2,439,559	₩ 1,711,595	₩ 2,886,867
Inflow	2,496,356	1,686,804	3,196,870
Less than 1 year [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	455,343	638,171	1,174,147
Inflow	484,505	608,270	1,302,112
1-5 years [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	1,466,915	546,791	1,176,715
Inflow	1,492,718	568,976	1,306,199
More than 5 years [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	517,301	526,633	536,005
Inflow	₩ 519,133	₩ 509,558	₩ 588,559

XML

Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [abstract]
Total liabilities	₩ 17,815,630	₩ 16,712,367	₩ 17,062,496	₩ 17,897,638
Total equity	₩ 14,658,490	₩ 13,183,354	₩ 14,190,193	₩ 12,916,942	₩ 12,916,942	₩ 12,253,627
Debt-to-equity ratio	122.00%	127.00%

XML

Financial Risk Management - Summary of Gearing Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [abstract]
Total borrowings	₩ 6,648,293	₩ 6,860,539
Less: cash and cash equivalents	(2,703,422)	(1,928,182)		₩ (2,900,311)	₩ (2,900,311)	₩ (2,559,464)
Net debt	3,944,871	4,932,357
Total equity	14,658,490	13,183,354	₩ 14,190,193	₩ 12,916,942	₩ 12,916,942	₩ 12,253,627
Total capital	₩ 18,603,361	₩ 18,115,711
Gearing ratio	21.00%	27.00%

XML

Financial Risk Management - Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of offsetting of financial assets [line items]
Gross assets	₩ 98,658	₩ 97,719
Gross liabilities offset	(1)	(5,446)
Net amounts presented in the statement of financial position	98,657	92,273
Amounts not offset, Financial instruments	(96,239)	(81,700)
Amounts not offset, Cash collateral	0	0
Net amount	2,418	10,573
Derivative used for hedge [member]
Disclosure of offsetting of financial assets [line items]
Gross assets		3,284
Net amounts presented in the statement of financial position		3,284
Amounts not offset, Financial instruments		(3,284)
Amounts not offset, Cash collateral		0
Trade receivables [member]
Disclosure of offsetting of financial assets [line items]
Gross assets	78,833	85,755
Gross liabilities offset	(1)	(5,010)
Net amounts presented in the statement of financial position	78,832	80,745
Amounts not offset, Financial instruments	(76,414)	(73,109)
Amounts not offset, Cash collateral	0	0
Net amount	2,418	7,636
Other Financial Assets1 [member]
Disclosure of offsetting of financial assets [line items]
Gross assets	19,825	8,680
Gross liabilities offset		(436)
Net amounts presented in the statement of financial position	19,825	8,244
Amounts not offset, Financial instruments	(19,825)	(5,307)
Amounts not offset, Cash collateral	₩ 0	0
Net amount		₩ 2,937

XML

Financial Risk Management - Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	₩ 98,144	₩ 112,513
Gross assets offset	(1)	(5,446)
Net amounts presented in the statement of financial position	98,143	107,067
Amounts not offset, Financial instruments	(96,238)	(81,700)
Amounts not offset, Cash collateral	0	0
Net amount	1,905	25,367
Derivative used for hedge [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities		26,135
Net amounts presented in the statement of financial position		26,135
Amounts not offset, Financial instruments		(3,284)
Amounts not offset, Cash collateral		0
Net amount		22,851
Trade payables [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	78,317	80,829
Gross assets offset		(5,217)
Net amounts presented in the statement of financial position	78,317	75,612
Amounts not offset, Financial instruments	(76,413)	(73,109)
Amounts not offset, Cash collateral	0	0
Net amount	1,904	2,503
Other [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	19,827	5,549
Gross assets offset	(1)	(229)
Net amounts presented in the statement of financial position	19,826	5,320
Amounts not offset, Financial instruments	(19,825)	(5,307)
Amounts not offset, Cash collateral	0	0
Net amount	₩ 1	₩ 13

XML

Fair Value - Summary of Carrying Amount and Fair Value of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,844,722	₩ 10,387,651
Financial liabilities	15,334,068	15,297,610
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	8,521,379	8,427,457
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	6,648,293	6,683,662
Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	99,330	87,670
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,758	5,051
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	57,308	93,770
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,703,422	1,928,182
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	5,425,996	6,793,397
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,097,348
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	484,271	1,333,368
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	777,685	5,913
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	326,157
Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		319,402
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	29,843	7,389
Fair value [member] | Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		6,738,326
Fair value [member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,758	5,051
Fair value [member] | Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	57,308	93,770
Fair value [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,097,348
Fair value [member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	777,685	5,913
Fair value [member] | Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	326,157
Fair value [member] | Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		319,402
Fair value [member] | Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 29,843	₩ 7,389

XML

Fair Value - Summary of Fair Value Hierarchy Classifications of Financial Assets and Financial Liabilities That are Measured at Fair Value (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss	₩ 777,685	₩ 5,913
Derivative financial assets for hedging	29,843	7,389
Available-for-sale financial assets		380,953
Investment properties	1,091,084	1,189,531	₩ 1,148,044
Financial assets, at fair value		2,088,204
Financial liabilities at fair value through profit or loss	7,758	5,051
Derivative financial liabilities for hedging	57,308	93,771
Financial liabilities, at fair value		98,821
Recurring fair value measurement [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss		5,813
Derivative financial assets for hedging		7,389
Available-for-sale financial assets		319,402
Financial liabilities at fair value through profit or loss		5,051
Derivative financial liabilities for hedging		93,770
Not measured at fair value in statement of financial position but for which fair value is disclosed [Member]
Disclosure of detailed information about financial instruments [line items]
Investment properties		1,755,600
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, at fair value		6,859
Level 1 [Member] | Recurring fair value measurement [Member]
Disclosure of detailed information about financial instruments [line items]
Available-for-sale financial assets		6,859
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets for hedging	29,843	7,389
Financial assets, at fair value		12,855
Financial liabilities, at fair value		76,045
Level 2 [Member] | Recurring fair value measurement [Member]
Disclosure of detailed information about financial instruments [line items]
Derivative financial assets for hedging		7,389
Available-for-sale financial assets		5,466
Derivative financial liabilities for hedging		76,045
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Investment properties	₩ 1,821,061	1,755,600
Financial assets, at fair value		2,068,490
Financial liabilities, at fair value		22,776
Level 3 [Member] | Recurring fair value measurement [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets at fair value through profit or loss		5,813
Available-for-sale financial assets		307,077
Financial liabilities at fair value through profit or loss		5,051
Derivative financial liabilities for hedging		17,725
Level 3 [Member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [Member]
Disclosure of detailed information about financial instruments [line items]
Investment properties		₩ 1,755,600

XML

Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
Disclosure of detailed information about financial instruments [line items]
Non financial assets	₩ 4,052,094
Non financial liabilities	65,066
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	8,982
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,746,915
Non financial liabilities	47,125
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	2,296,197
Non financial liabilities	17,941
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,097,348
Financial assets at fair value through other comprehensive income [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,097,348
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	777,685
Financial assets at fair value through profit or loss [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	121
Financial assets at fair value through profit or loss [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	613,964
Financial assets at fair value through profit or loss [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	163,600
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	326,157
Other financial assets at fair value through other comprehensive income [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	8,861
Other financial assets at fair value through other comprehensive income [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	5,760
Other financial assets at fair value through other comprehensive income [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	311,536
Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	29,843
Derivative financial assets for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	29,843
Investment Properties [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,821,061
Investment Properties [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,821,061
Other financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	7,758
Other financial liabilities at fair value through profit or loss [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	7,758
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	57,308
Derivative financial liabilities for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	47,125
Derivative financial liabilities for hedging [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	₩ 10,183

XML

Fair Value - Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 10,387,651
Ending balance	10,844,722	₩ 10,387,651
Beginning balance	15,297,610
Ending balance	15,334,068	15,297,610
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	5,913
Ending balance	777,685	5,913
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	5,813	6,277
Amount recognized in profit or loss		(464)
Ending balance		5,813
Recurring fair value measurement [Member] | Level 3 [Member] | Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	307,077	287,889
Purchases		85,287
Reclassification		(277)
Sales		(124,159)
Amount recognized in profit or loss		(113)
Amount recognized in other comprehensive income		58,450
Ending balance		307,077
Recurring fair value measurement [Member] | Level 3 [Member] | Other derivative liabilities [Member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	5,051	1,973
Purchases		0
Reclassification		0
Sales		0
Amount recognized in profit or loss		3,078
Ending balance		5,051
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	17,725
Changes in accounting policy	0
Purchases	0	0
Reclassification	0	0
Changes in scope of consolidation	0
Sales	0	0
Amount recognized in profit or loss	(17,255)	19,634
Amount recognized in other comprehensive income	9,713	(1,909)
Ending balance	10,183	17,725
Recurring fair value measurement [Member] | Level 3 [Member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	5,051
Changes in accounting policy	0
Purchases	0
Reclassification	0
Changes in scope of consolidation	0
Sales	0
Amount recognized in profit or loss	2,707
Ending balance	7,758	5,051
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	97,547
Changes in accounting policy	32,745
Purchases	21,365
Reclassification	1,581
Sales	(1,852)
Amount recognized in profit or loss	12,214
Ending balance	163,600	97,547
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	238,517
Changes in accounting policy	2,085
Purchases	8,802
Reclassification	(296)
Changes in scope of consolidation	364
Sales	(1,099)
Amount recognized in profit or loss	89
Amount recognized in other comprehensive income	63,074
Ending balance	₩ 311,536	₩ 238,517

XML

Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Financial assets at fair value through other comprehensive income	₩ 326,157
Other financial assets
Available-for-sale financial assets		₩ 380,953
Financial assets at fair value through profit or loss	777,685	5,913
Financial assets at fair value through other comprehensive income	326,157
Derivative financial assets for hedging	29,843	7,389
Investment properties	1,091,084	1,189,531	₩ 1,148,044
Other financial liabilities
Financial liabilities at fair value through profit or loss	7,758	5,051
Derivative financial liabilities for hedging	57,308	93,771
Level 2 [Member]
Other financial assets
Derivative financial assets for hedging	₩ 29,843	₩ 7,389
Other financial liabilities
Valuation techniques	DCF Model	DCF Model
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member]
Other financial liabilities
Valuation techniques	DCF Model
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member] | Trades and other receivables [member]
Assets
Financial assets at fair value through other comprehensive income	₩ 1,097,348
Other financial assets
Financial assets at fair value through other comprehensive income	1,097,348
Level 2, 3 [Member]
Other financial liabilities
Derivative financial liabilities for hedging	₩ 57,308	₩ 93,770
Valuation techniques	Hull-White model, DCF Model	Hull-White model, DCF Model
Level 2, 3 [Member] | Financial assets at fair value through profit or loss [member]
Other financial assets
Available-for-sale financial assets		₩ 312,543
Financial assets at fair value through profit or loss	₩ 777,564
Other financial liabilities
Valuation techniques	DCF Model, Adjusted net asset model	DCF Model
Level 2, 3 [Member] | Financial assets at fair value through other comprehensive income [member]
Assets
Financial assets at fair value through other comprehensive income	₩ 317,296
Other financial assets
Financial assets at fair value through other comprehensive income	₩ 317,296
Other financial liabilities
Valuation techniques	DCF Model
Level 3 [Member]
Other financial assets
Investment properties	₩ 1,821,061	₩ 1,755,600
Other financial liabilities
Valuation techniques		DCF Model
Valuation techniques	DCF Model	DCF Model, Comparable Company Analysis
Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Other financial assets
Financial assets at fair value through profit or loss		₩ 5,813
Other financial liabilities
Other derivative financial liabilities		₩ 5,051
Financial liabilities at fair value through profit or loss	₩ 7,758
Valuation techniques		DCF Model
Valuation techniques	DCF Model, Comparable Company Analysis

XML

Fair Value - Summary of Details and Changes of Total Deferred Difference (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 10,387,651
Recognized at fair value through profit or loss	777,685	₩ 5,913
Ending balance	10,844,722	10,387,651
Beginning balance	15,297,610
Recognized at fair value through profit or loss	7,758	5,051
Ending balance	15,334,068	15,297,610
Derivatives held for trading [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	(5,647)	(8,470)
New transactions	0	0
Recognized at fair value through profit or loss	2,823	2,823
Ending balance	(2,824)	(5,647)
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	6,532
New transactions		7,126
Recognized at fair value through profit or loss	(1,425)	(594)
Ending balance	₩ 5,107	₩ 6,532

XML

Interests in Unconsolidated Structured Entities - Summary of Unconsolidated Structured Entities and Nature of Risks (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of unconsolidated structured entities [line items]
Other financial assets	₩ 1,617,956	₩ 1,727,623
Joint ventures and associates	272,407	279,431	₩ 284,075
Real Estate Finance [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	1,429,910	1,426,620
Other financial assets	24,421	21,800
Joint ventures and associates	7,293	10,168
Total	31,714	31,968
Maximum loss exposure Investment assets	31,714	31,968
PEF &Investment Fund [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	3,701,718	3,779,377
Other financial assets	94,075	52,666
Joint ventures and associates	166,159	164,030
Total	260,234	216,696
Maximum loss exposure Investment assets	260,234	216,696
Asset Securitization [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	2,751,208	2,619,445
Unconsolidated structured entities [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	7,882,836	7,825,442
Other financial assets	118,496	74,466
Joint ventures and associates	173,452	174,198
Total	291,948	248,664
Maximum loss exposure Investment assets	₩ 291,948	₩ 248,664

XML

Information About Non-controlling Interests - Summary of Changes in Accumulated Non-controlling Interests (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of subsidiaries [line items]
Accumulated non-controlling interests at the beginning of the year	₩ 1,391,764
Profit or loss allocated to non-controlling interests	73,841	₩ 84,782	₩ 86,755
Accumulated non-controlling interests at the end of the year	₩ 1,528,589	₩ 1,391,764
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	49.73%	49.73%	49.73%
Accumulated non-controlling interests at the beginning of the year	₩ 328,302	₩ 329,676	₩ 316,880
Profit or loss allocated to non-controlling interests	23,405	9,395	22,445
Dividend paid to non-controlling interests	(8,279)	(9,817)	(8,279)
Others	30,722	(952)	(1,370)
Accumulated non-controlling interests at the end of the year	₩ 374,150	₩ 328,302	₩ 329,676
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	30.46%	30.46%	30.46%
Accumulated non-controlling interests at the beginning of the year	₩ 339,067	₩ 329,338	₩ 322,921
Profit or loss allocated to non-controlling interests	28,418	43,961	47,068
Dividend paid to non-controlling interests	(35,924)	(29,490)	(44,637)
Others	13,986	(4,742)	3,986
Accumulated non-controlling interests at the end of the year	₩ 345,547	₩ 339,067	₩ 329,338
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	55.15%	55.15%	55.15%
Accumulated non-controlling interests at the beginning of the year	₩ 53,053	₩ 51,751	₩ 50,926
Profit or loss allocated to non-controlling interests	(3,058)	1,165	112
Others	2,870	137	713
Accumulated non-controlling interests at the end of the year	₩ 52,865	₩ 53,053	₩ 51,751
KT Hitel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	32.87%	32.87%	35.27%
Accumulated non-controlling interests at the beginning of the year	₩ 53,146	₩ 51,798	₩ 50,689
Profit or loss allocated to non-controlling interests	454	870	1,274
Others	(1,264)	478	(165)
Accumulated non-controlling interests at the end of the year	₩ 52,336	₩ 53,146	₩ 51,798
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	13.18%	13.18%	13.18%
Accumulated non-controlling interests at the beginning of the year	₩ 103,468	₩ 103,532	₩ 103,428
Profit or loss allocated to non-controlling interests	59	381	19
Others	(170)	(445)	85
Accumulated non-controlling interests at the end of the year	₩ 103,357	₩ 103,468	₩ 103,532

XML

Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017	Dec. 31, 2015
Disclosure of subsidiaries [line items]
Current assets	₩ 12,157,814	₩ 9,828,525		₩ 11,117,433	₩ 9,866,302
Non-current assets	20,316,306	20,067,196		20,135,256	20,948,278
Current liabilities	9,394,123	9,474,162		9,744,055	9,539,195
Non-current liabilities	8,421,507	7,238,205		7,318,441	8,358,443
Equity	14,658,490	13,183,354	₩ 12,916,942	₩ 14,190,193	₩ 12,916,942	₩ 12,253,627
Operating revenue	23,436,050	23,546,929	23,164,202
Profit or loss for the year	719,412	546,341	831,845
Total comprehensive income	664,784	478,053	826,175
Cash flows from operating activities	4,010,464	3,877,749	4,770,750
Cash flows from investing activities	(2,704,130)	(3,483,245)	(3,484,958)
Cash flows from financing activities	(531,675)	(1,363,499)	(943,271)
Net (decrease)/increase in cash and cash equivalents	775,240	(972,129)	340,847
Cash and cash equivalents at beginning of year	1,928,182	2,900,311	2,559,464
Exchange differences	581	(3,134)	(1,674)
Cash and cash equivalents at end of year	₩ 2,703,422	₩ 1,928,182	₩ 2,900,311
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	49.73%	49.73%	49.73%
Current assets	₩ 301,739	₩ 324,632	₩ 352,980
Non-current assets	514,263	468,261	424,968
Current liabilities	112,411	185,995	151,329
Non-current liabilities	37,430	24,555	80,123
Equity	666,161	582,343	546,496
Operating revenue	694,059	687,752	668,945
Profit or loss for the year	52,010	57,314	68,863
Total comprehensive income	47,787	55,586	68,785
Cash flows from operating activities	183,474	99,269	155,399
Cash flows from investing activities	(139,846)	(81,758)	(210,480)
Cash flows from financing activities	(77,647)
Cash flows from financing activities before dividend paid to non-controlling interests		(19,739)	(16,647)
Dividend paid to non-controlling interests	(8,279)	(9,817)	(8,279)
Net (decrease)/increase in cash and cash equivalents	(34,019)	(2,228)	₩ (71,728)
Cash and cash equivalents at beginning of year	65,747
Cash and cash equivalents at end of year	₩ 31,728	₩ 65,747
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	30.46%	30.46%	30.46%
Current assets	₩ 2,997,429	₩ 3,225,262	₩ 2,945,584
Non-current assets	724,950	823,001	705,480
Current liabilities	2,520,050	2,868,669	2,530,832
Non-current liabilities	110,486	86,369	71,571
Equity	1,091,843	1,093,225	1,048,661
Operating revenue	3,551,715	3,628,995	3,567,512
Profit or loss for the year	70,889	156,109	163,131
Total comprehensive income	116,604	141,719	178,744
Cash flows from operating activities	86,299	108,203	92,818
Cash flows from investing activities	128,538	(568,518)	(37,313)
Cash flows from financing activities	(117,561)
Cash flows from financing activities before dividend paid to non-controlling interests		(97,221)	(147,306)
Dividend paid to non-controlling interests	(35,924)	(29,490)	(44,637)
Gain or loss foreign currency translation		(184)	(178)
Net (decrease)/increase in cash and cash equivalents	97,276	(557,536)	₩ (91,801)
Cash and cash equivalents at beginning of year	177,826
Exchange differences	(13)
Cash and cash equivalents at end of year	₩ 275,089	₩ 177,826
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	55.15%	55.15%	55.15%
Current assets	₩ 84,785	₩ 73,527	₩ 69,046
Non-current assets	39,279	41,598	44,679
Current liabilities	27,187	18,450	17,910
Non-current liabilities	1,030	487	1,989
Equity	95,847	96,188	93,826
Operating revenue	65,620	69,234	81,390
Profit or loss for the year	(5,545)	2,112	202
Total comprehensive income	(5,792)	2,362	202
Cash flows from operating activities	11,603	13,895	7,271
Cash flows from investing activities	(2,580)	(17,354)	(8,191)
Net (decrease)/increase in cash and cash equivalents	9,023	(3,459)	₩ (920)
Cash and cash equivalents at beginning of year	6,626
Cash and cash equivalents at end of year	₩ 15,649	₩ 6,626
KT Hitel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	32.87%	32.87%	35.27%
Current assets	₩ 161,162	₩ 150,368	₩ 158,210
Non-current assets	111,546	107,872	90,992
Current liabilities	63,231	49,922	45,277
Non-current liabilities	2,812	3,021	1,664
Equity	206,665	205,297	202,261
Operating revenue	279,117	227,884	198,994
Profit or loss for the year	657	3,225	4,298
Total comprehensive income	738	3,036	1,399
Cash flows from operating activities	43,855	28,320	28,987
Cash flows from investing activities	(26,335)	(36,086)	(33,238)
Gain or loss foreign currency translation		(47)	3
Net (decrease)/increase in cash and cash equivalents	17,520	(7,766)	₩ (4,251)
Cash and cash equivalents at beginning of year	21,647
Exchange differences	19
Cash and cash equivalents at end of year	₩ 39,186	₩ 21,647
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	13.18%	13.18%	13.18%
Current assets	₩ 52,367	₩ 73,023	₩ 63,802
Non-current assets	220,125	191,330	201,751
Current liabilities	85,648	90,569	53,903
Non-current liabilities	54,666	41,064	78,441
Equity	132,178	132,720	133,209
Operating revenue	328,262	317,591	315,948
Profit or loss for the year	166	2,885	143
Total comprehensive income	(1,517)	(490)	143
Cash flows from operating activities	40,351	57,262	60,461
Cash flows from investing activities	(76,969)	(43,483)	(45,243)
Cash flows from financing activities	10,000
Net (decrease)/increase in cash and cash equivalents	(26,618)	13,779	₩ 15,218
Cash and cash equivalents at beginning of year	32,326
Cash and cash equivalents at end of year	₩ 5,708	₩ 32,326

XML

Information About Non-controlling Interests - Summary of Changes in Ownership Interest on the Equity Attributable to Owners (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of subsidiaries [abstract]
Carrying amount of non-controlling interests acquired	₩ (194)	₩ (732)	₩ 4,022
Consideration paid to non-controlling interests	11,312	6,173	7,347
Excess of consideration paid recognized in parent's equity	₩ 11,118	₩ 5,441	₩ 11,369

XML

Business Combination - Additional Information (Detail) ₩ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2018 KRW (₩) shares	Dec. 31, 2018 KRW (₩)	Dec. 31, 2017
CJ ENM CO., Ltd [member]
Disclosure of detailed information about business combination [Line Items]
Percentage of ownership interest	100.00%
Number of shares acquired | shares	1,600,000
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Consideration	₩ 27,570	₩ 27,544
MOS GB Co.,Ltd and MOS Chungcheong Co., Ltd., [member]
Disclosure of detailed information about business combination [Line Items]
Consideration	₩ 11,048
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Consideration		₩ 50,948
GENIE Music Corporation K T Music Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Percentage of ownership interest		36.00%	42.50%
GENIE Music Corporation K T Music Corporation [member] | CJ Digital Music Co., Ltd. [member] | CJ ENM CO., Ltd [member]
Disclosure of detailed information about business combination [Line Items]
Number of shares issued	8,922,685

XML

Business Combination - Summary of Business Combination (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2018
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Date	May 31, 2018
Purchase consideration	₩ 27,544	₩ 27,570
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Sep. 30, 2018
Purchase consideration	₩ 8,160
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Sep. 30, 2018
Purchase consideration	₩ 6,310
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Date	Oct. 10, 2018
Purchase consideration	₩ 50,948

XML

Business Combination - Schedule of Fair Value of Purchase Consideration from Business Combination (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Mar. 31, 2018
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	₩ 28,000
Settled receivables	(456)
Total	27,544	₩ 27,570
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	6,283
Fair value of equity instruments previously held	1,877
Total	8,160
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Cash and cash equivalents	4,765
Fair value of equity instruments previously held	1,545
Total	6,310
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Fair value of equity instruments newly issued	50,948
Total	₩ 50,948

XML

Business Combination - Schedule of Fair Value of Purchase Consideration from Business Combination (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩) shares
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Number of ordinary shares previously held | shares	93,994
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Number of ordinary shares previously held | shares	65,831
GENIE Music Corporation K T Music Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Fair value of equity instruments newly issued | ₩	₩ 50,948
Number of ordinary shares issued	8,992,685
Share issuance cost | ₩	₩ 31

XML

Business Combination - Schedule of Fair Value of Assets and Liabilities Recognized as a Result of Acquisition at Acquisition Date (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Recognized amounts of identifiable assets acquired	₩ 17,763
Other current assets	1,367
Property and equipment	4,047
Contractual customer relationship (included in intangibles)	10,467
Other non-currentassets	1,882
Recognized amounts of identifiable liabilities assumed	5,637
Trade and other payables	120
Borrowings	5,000
Post-employment benefit obligations	517
Total	12,126
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Recognized amounts of identifiable assets acquired	14,924
Cash and cash equivalents	7,864
Trade and other receivables	4,827
Other current assets	160
Property and equipment	855
Intangible assets	997
Deferred income tax assets	113
Other non-currentassets	10
Other non-current financial assets	98
Recognized amounts of identifiable liabilities assumed	10,050
Trade and other payables	6,767
Other current liabilities	363
Current income tax liabilities	103
Post-employment benefit obligations	2,768
Other non-currentliabilities	49
Total	4,874
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Recognized amounts of identifiable assets acquired	12,242
Cash and cash equivalents	3,340
Trade and other receivables	6,318
Other current assets	85
Current income tax assets	75
Property and equipment	1,104
Intangible assets	478
Deferred income tax assets	576
Other non-current financial assets	266
Recognized amounts of identifiable liabilities assumed	6,433
Trade and other payables	3,327
Other current liabilities	703
Post-employment benefit obligations	2,360
Other non-currentliabilities	43
Total	5,809
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Recognized amounts of identifiable assets acquired	28,117
Cash and cash equivalents	1,556
Trade and other receivables	11,200
Other current assets	484
Inventories	5
Property and equipment	791
Intangible assets	1,860
Distribution agency contract (included in intangibles)	11,753
Contractual customer relationship (included in intangibles)	468
Recognized amounts of identifiable liabilities assumed	25,559
Trade and other payables	18,947
Other current liabilities	3,481
Post-employment benefit obligations	311
Deferred income tax liabilities	2,497
Other non-currentliabilities	323
Total	₩ 2,558

XML

Business Combination - Schedule of Recognized Goodwill as a Result of Business Combination (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about business combination [Line Items]
Add: Non-controllinginterests	₩ 194		₩ 732	₩ (4,022)
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration	27,544	₩ 27,570
Less: Fair value of identifiable net assets	12,126
Goodwill	15,418
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration	8,160
Less: Fair value of identifiable net assets	4,874
Goodwill	3,286
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration	6,310
Add: Non-controllinginterests	101
Less: Fair value of identifiable net assets	5,809
Goodwill	602
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration	50,948
Less: Fair value of identifiable net assets	2,558
Goodwill	₩ 48,390

XML

Business Combination - Schedule of Cash Outflows as a Result of Acquisition (Detail) ₩ in Millions	Dec. 31, 2018 KRW (₩)
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	₩ 28,000
Total	28,000
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	6,283
Less : Recognized amounts of cash and cash equivalents	7,864
Total	(1,581)
KTMOS Nambu Co.,Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Purchase consideration Cash	4,765
Less : Recognized amounts of cash and cash equivalents	3,340
Total	1,425
CJ Digital Music Co., Ltd. [member]
Disclosure of detailed information about business combination [Line Items]
Less : Recognized amounts of cash and cash equivalents	1,556
Total	₩ (1,556)

XML

Business Combination - Schedule of Cash Outflows as a Result of Acquisition (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Mar. 31, 2018
SG Safety Corporation [member]
Disclosure of detailed information about business combination [Line Items]
Purchase considerations	₩ 27,544	₩ 27,570

XML

Changes in Accounting Policies - Summary of Impact on Financial Statements Due to Application of IFRS 15 at the Date of Initial Application (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2017	Jan. 01, 2016	Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Current assets	₩ 12,157,814	₩ 9,828,525		₩ 11,117,433	₩ 9,866,302
Trade and other receivables	5,680,349	5,964,565		5,969,040	5,477,634
Inventories	1,074,634	642,027		642,027	454,588
Other current assets	1,687,548	304,860		1,589,293	311,135
Others	3,715,283			2,917,073
Non-current assets	20,316,306	20,067,196		20,135,256	20,948,278
Trade and other receivables	842,995	828,832		826,547	709,011
Deferred income tax assets	465,369	712,222		359,949	701,409
Other non-current assets	545,895	107,165		529,783	106,099
Others	18,462,047			18,418,977
Total assets	32,474,120	29,895,721		31,252,689	30,814,580
Current liabilities	9,394,123	9,474,162		9,744,055	9,539,195
Trade and other payables	7,007,515	7,426,088		7,426,385	7,141,725
Deferred revenue	52,878	17,906		51,561	35,617
Provisions	117,881	78,172		78,349	96,485
Other current liabilities	596,589	258,314		494,079	342,291
Others	8,626,775			1,693,681
Non-current liabilities	8,421,507	7,238,205		7,318,441	8,358,443
Deferred revenue	110,702	91,698		115,529	85,372
Deferred income tax liabilities	204,785	128,462		135,367	137,680
Other non-current liabilities	423,626	237,284		286,783	58,761
Others	7,682,394			6,780,762
Total liabilities	17,815,630	16,712,367		17,062,496	17,897,638
Equity attribute to owners of the Controlling Company	13,129,901	11,791,590	₩ 11,564,098	12,721,456	11,564,098	₩ 10,933,231
Non-controllinginterest	1,528,589	1,391,764		1,468,737	1,352,844
Total equity	14,658,490	13,183,354	12,916,942	14,190,193	12,916,942		₩ 12,253,627
Operating revenue	23,436,050	23,546,929	23,164,202
Operating expenses	22,335,190	22,477,837	21,781,098
Operating profit	1,100,860	1,069,092	1,383,104
Financial income	374,243	406,328	296,139
Financial costs	435,659	644,531	515,087
Share of net losses of associates and joint venture	(5,467)	(13,892)	2,599
Profit before income tax	1,033,977	816,997	1,166,755
Income tax expense	314,565	270,656	334,910
Profit for the year	719,412	546,341	831,845
As previously reported [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Current assets	10,822,686	9,678,243		9,828,525	9,716,020
Trade and other receivables	5,687,490	5,814,283		5,964,565	5,327,352
Inventories	1,127,669			642,027
Other current assets	292,244			304,860
Others	3,715,283			2,917,073
Non-current assets	20,228,874			20,067,196
Trade and other receivables	847,612			828,832
Deferred income tax assets	822,297			712,222
Other non-current assets	96,918			107,165
Others	18,462,047			18,418,977
Total assets	31,051,560	29,745,439		29,895,721	30,664,298
Current liabilities	9,075,863	9,458,104		9,474,162	9,523,137
Trade and other payables		7,424,134		7,426,088	7,139,771
Deferred revenue	14,821			17,906
Provisions	117,316			78,172
Other current liabilities	316,951			258,315
Others	8,626,775			1,693,681
Non-current liabilities	8,366,999			7,238,205
Deferred revenue	83,469			91,698
Deferred income tax liabilities	183,766			128,462
Other non-current liabilities	417,370			237,283
Others	7,682,394			6,780,762
Total liabilities	17,442,862	16,696,309		16,712,367	17,881,580
Equity attribute to owners of the Controlling Company	12,159,471	11,657,366	11,429,874	11,791,590	11,429,874	₩ 10,835,735
Non-controllinginterest	1,449,227			1,391,764
Total equity	13,608,698	13,049,130		13,183,354	₩ 12,782,718		12,156,131
Operating revenue	23,704,320		23,120,878
Operating expenses	22,651,685
Operating profit	1,052,635		1,339,780
Financial income	370,381
Financial costs	452,519
Share of net losses of associates and joint venture	(5,467)
Profit before income tax	965,030		1,123,431
Income tax expense	296,621		328,314
Profit for the year	668,409		₩ 795,117
Increase (decrease) due to application of IFRS 15 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Current assets	(1,335,128)			1,288,908
Trade and other receivables	7,141			4,475
Inventories	53,035
Other current assets	(1,395,304)			1,284,433
Non-current assets	(87,432)			68,060
Trade and other receivables	4,617			(2,285)
Deferred income tax assets	356,928			(352,273)
Other non-current assets	(448,977)			422,618
Total assets	(1,422,560)			1,356,968
Current liabilities	(318,260)			269,893
Trade and other payables				297
Deferred revenue	(38,057)			33,655
Provisions	(565)			177
Other current liabilities	(279,638)			235,764
Non-current liabilities	(54,508)			80,236
Deferred revenue	(27,233)			23,831
Deferred income tax liabilities	(21,019)			6,905
Other non-current liabilities	(6,256)			49,500
Total liabilities	(372,768)			350,129
Equity attribute to owners of the Controlling Company	(970,430)			929,866
Non-controllinginterest	(79,362)			76,973
Total equity	(1,049,792)			₩ 1,006,839
Operating revenue	268,270
Operating expenses	316,495
Operating profit	(48,225)
Financial income	(3,862)
Financial costs	16,860
Profit before income tax	(68,947)
Income tax expense	(17,944)
Profit for the year	(51,003)
Adjusted [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Total equity		₩ 14,232,276					₩ 97,496
Operating revenue	23,436,050
Operating expenses	22,335,190
Operating profit	1,100,860
Financial income	374,243
Financial costs	435,659
Share of net losses of associates and joint venture	(5,467)
Profit before income tax	1,033,977
Income tax expense	314,565
Profit for the year	₩ 719,412

XML

Changes in Accounting Policies - Additional Information (Detail) - KRW (₩) ₩ in Millions		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Description of practical expedients used for incremental cost of obtaining contract		As a practical expedient, the Group recognizes the incremental costs of obtaining a contracts as an expense when incurred if the amortization period of the asset is one year or less.
Increase (decrease) in prepaid expenses	₩ 1,285,443	₩ 1,444,822
Increase (decrease) due to application of IFRS 15 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Increase (decrease) in contract assets	421,131	398,797
Increase (decrease) in contract liabilities	₩ 282,836	₩ 347,461

XML

Changes in Accounting Policies - Summary of Beginning Balance of Retained Earnings after Adjustment Due to Application of IFRS 9 (Detail) ₩ in Millions	Jan. 01, 2018 KRW (₩)
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Beginning balance - IAS 39	₩ 9,961,150
Beginning balance of retained earnings after adjustment	10,915,203
IAS 39 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Beginning balance - IAS 39	9,961,150
IFRS9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Reclassification of available-for-sale securities to financial assets at fair value through profit or loss	32,754
Reclassification of available-for-sale securities to financial assets at fair value through other comprehensive income	2,191
Increase in provision for impairment of financial assets at amortized cost	(1,817)
Increase in provision with unused limit	(287)
Decrease in deferred income tax assets	(8,395)
Adjustments of non-controlled interests	(259)
Adjustment to retained earnings from adoption of IFRS 15	24,187
Beginning balance - IAS 39	9,985,337
IFRS 15 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Adjustment to retained earnings from adoption of IFRS 15	₩ 929,866

XML

Changes in Accounting Policies - Summary of Effects Resulting from Classification and Measurement of Financial Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Cash and cash equivalent	₩ 2,703,422		₩ 1,928,182	₩ 2,900,311	₩ 2,900,311	₩ 2,559,464
Trade and other receivables	6,523,344		6,793,397
Other financial assets	1,617,956		1,727,623
Trade payables and payables	8,521,379		8,427,457
Borrowing	6,648,293		6,683,662
Other financial liabilities	₩ 164,396		₩ 186,491
Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Trade and other receivables		₩ (1,028)
Other financial assets		(789)
Loans and receivables under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Trade and other receivables		24,486
Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		32,745
Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		2,085
Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial liabilities		287
IAS 39 [member] | Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Cash and cash equivalent		1,928,182
Trade and other receivables		6,793,397
Other financial assets		1,333,317
IAS 39 [member] | Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		5,813
IAS 39 [member] | Derivative financial assets for hedging purpose under IAS 39 reclassified to Derivative financial assets for hedging purpose under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		7,389
IAS 39 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		380,953
IAS 39 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		151
IAS 39 [member] | Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Trade payables and payables		8,427,457
Borrowing		6,683,662
Other financial liabilities		89,104
IAS 39 [member] | Financial liabilities at fair value through profit or loss under IAS 39 reclassified to financial liabilities at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial liabilities		5,051
IAS 39 [member] | Derivative financial liabilities for hedging purpose under IAS 39 reclassified to derivative financial liabilities for hedging purpose under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial liabilities		93,770
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Cash and cash equivalent		1,928,182
Trade and other receivables		5,836,089
Other financial assets		462,075
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Trade and other receivables		980,766
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		870,453
IFRS9 [member] | Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		5,813
IFRS9 [member] | Derivative financial assets for hedging purpose under IAS 39 reclassified to Derivative financial assets for hedging purpose under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		7,389
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		28,603
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		127,276
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		259,904
IFRS9 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		51
IFRS9 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial assets		100
IFRS9 [member] | Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Trade payables and payables		8,427,457
Borrowing		6,683,662
Other financial liabilities		89,391
IFRS9 [member] | Financial liabilities at fair value through profit or loss under IAS 39 reclassified to financial liabilities at fair value through profit or loss under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial liabilities		5,051
IFRS9 [member] | Derivative financial liabilities for hedging purpose under IAS 39 reclassified to derivative financial liabilities for hedging purpose under IFRS 9 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Other financial liabilities		₩ 93,770

XML

Changes in Accounting Policies - Summary of Impact on Changes in Equity (Detail) - Increase (decrease) due to changes in accounting policy required by IFRSs [member] ₩ in Millions	Jan. 01, 2018 KRW (₩)
Accumulated other comprehensive income [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Reclassification from loans and receivables to financial assets at fair value through other comprehensive income, and fair value assessment	₩ 24,486
Reclassification from available-for-sale financial assets to financial assets at fair value through profit or loss, and fair value assessment	(9)
Reclassification from available-for-sale financial assets to financial assets at fair value through other comprehensive income	(106)
Income tax effect	(6,734)
Adjustments of non-controlled interests	104
Total adjustments from application of IFRS 9	17,741
Retained earnings [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Reclassification from available-for-sale financial assets to financial assets at fair value through profit or loss, and fair value assessment	32,754
Reclassification from available-for-sale financial assets to financial assets at fair value through other comprehensive income	2,191
Increase in provision for impairment of financial assets at amortized cost	(1,817)
Increase in provision with unused limit	(287)
Income tax effect	(8,395)
Adjustments of non-controlled interests	(259)
Total adjustments from application of IFRS 9	₩ 24,187

XML

Events after Reporting Period - Summary of Public Bonds Issued After Reporting Period (Detail) - Gross carrying amount [member] ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)
The 191-1st Public bond, January fourteen, twenty twenty two [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	2019.01.15
Carrying amount	₩ 220,000
Interest rate	2.048%
Redemption date	2022.01.14
The 191-2nd Public bond, January fifteen, twenty twenty four [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	2019.01.15
Carrying amount	₩ 80,000
Interest rate	2.088%
Redemption date	2024.01.15
The191-3rd Public bond, January fifteen, twenty twenty nine [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	2019.01.15
Carrying amount	₩ 110,000
Interest rate	2.16%
Redemption date	2029.01.15
The191-4th Public bond, January fourteen, twenty thirty nine [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	2019.01.15
Carrying amount	₩ 90,000
Interest rate	2.213%
Redemption date	2039.01.14

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Revision of Prior Financial Statements - Summary of Consolidated Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Current assets	₩ 12,157,814	₩ 11,117,433	₩ 9,828,525	₩ 9,866,302
Trade and other receivables	5,680,349	5,969,040	5,964,565	5,477,634
Total assets	32,474,120	31,252,689	29,895,721	30,814,580
Current liabilities	9,394,123	9,744,055	9,474,162	9,539,195
Trade and other payables	7,007,515	7,426,385	7,426,088	7,141,725
Current income tax liabilities	249,837		82,984	102,843
Total liabilities	17,815,630	17,062,496	16,712,367	17,897,638
Equity attribute to owners of the Controlling Company	13,129,901	12,721,456	11,791,590	11,564,098	₩ 11,564,098	₩ 10,933,231
Retained earnings	11,256,069		9,961,150	9,778,707	9,778,707	9,147,467
Total equity	14,658,490	14,190,193	13,183,354	12,916,942	12,916,942		₩ 12,253,627
Total liabilities and equity	32,474,120		29,895,721	30,814,580
As previously reported [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Current assets	10,822,686	9,828,525	9,678,243	9,716,020
Trade and other receivables	5,687,490	5,964,565	5,814,283	5,327,352
Total assets	31,051,560	29,895,721	29,745,439	30,664,298
Current liabilities	9,075,863	9,474,162	9,458,104	9,523,137
Trade and other payables		7,426,088	7,424,134	7,139,771
Current income tax liabilities			68,880	88,739
Total liabilities	17,442,862	16,712,367	16,696,309	17,881,580
Equity attribute to owners of the Controlling Company	12,159,471	11,791,590	11,657,366	11,429,874	11,429,874	10,835,735
Retained earnings			9,826,926	9,644,483	9,644,483	9,049,971
Total equity	13,608,698	₩ 13,183,354	13,049,130	12,782,718			₩ 12,156,131
Total liabilities and equity			29,745,439	30,664,298
Adjustments [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Current assets			150,282	150,282
Trade and other receivables			150,282	150,282
Total assets			150,282	150,282
Current liabilities			16,058	16,058
Trade and other payables			1,954	1,954
Current income tax liabilities			14,104	14,104
Total liabilities			16,058	16,058
Equity attribute to owners of the Controlling Company			134,224	134,224	134,224	97,496
Retained earnings	₩ 97,496		134,224	134,224	₩ 134,224	₩ 97,496
Total equity			134,224	134,224
Total liabilities and equity			₩ 150,282	₩ 150,282

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Revision of Prior Financial Statements - Summary of Consolidated Statement of Operations & Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Operating revenue	₩ 23,436,050	₩ 23,546,929	₩ 23,164,202
Operating profit	1,100,860	1,069,092	1,383,104
Profit before income tax	1,033,977	816,997	1,166,755
Income tax expense	314,565	270,656	334,910
Profit for the year	719,412	546,341	831,845
Profit for the year attributable to the equity holders of the Controlling Company	645,571	461,559	745,090
Total comprehensive income for the year	664,784	478,053	826,175
Total comprehensive income for the year attributable to the equity holders of the Controlling Company	589,179	₩ 413,149	738,413
As previously reported [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Operating revenue	23,704,320		23,120,878
Operating profit	1,052,635		1,339,780
Profit before income tax	965,030		1,123,431
Income tax expense	296,621		328,314
Profit for the year	₩ 668,409		795,117
Profit for the year attributable to the equity holders of the Controlling Company			708,362
Total comprehensive income for the year			789,447
Total comprehensive income for the year attributable to the equity holders of the Controlling Company			701,685
Adjustments [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Operating revenue			43,324
Operating profit			43,324
Profit before income tax			43,324
Income tax expense			6,596
Profit for the year			36,728
Profit for the year attributable to the equity holders of the Controlling Company			36,728
Total comprehensive income for the year			36,728
Total comprehensive income for the year attributable to the equity holders of the Controlling Company			₩ 36,728

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Revision of Prior Financial Statements - Summary of Consolidated Statements of Changes in Equity (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Retained earnings	₩ 11,256,069		₩ 9,961,150	₩ 9,778,707	₩ 9,778,707	₩ 9,147,467
Owners of the Controlling Company	13,129,901	₩ 12,721,456	11,791,590	11,564,098	11,564,098	10,933,231
As previously reported [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Retained earnings			9,826,926	9,644,483	9,644,483	9,049,971
Owners of the Controlling Company	12,159,471	₩ 11,791,590	11,657,366	11,429,874	11,429,874	10,835,735
Adjustments [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Retained earnings	₩ 97,496		134,224	134,224	134,224	97,496
Owners of the Controlling Company			₩ 134,224	₩ 134,224	₩ 134,224	₩ 97,496

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Revision of Prior Financial Statements - Summary of Effects from Adjustments of Financial Statements before 2016 (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Jan. 01, 2016
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Retained earnings	₩ 11,256,069	₩ 9,961,150	₩ 9,778,707	₩ 9,778,707	₩ 9,147,467
Adjustments [member]
Disclosure of changes in accounting policies, accounting estimates and errors [line items]
Retained earnings	₩ 97,496	₩ 134,224	₩ 134,224	₩ 134,224	₩ 97,496