20-F

As filed with the Securities and Exchange Commission on April 30, 2021

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, 2020

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)

Young-Jin Kim

KT Gwanghwamun Building East

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

03155 Seoul, Korea

Telephone: +82-31-727-0114; E-mail: 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	Trading symbol	Name of each exchange on which registered
American Depositary Shares, each representing one-half of one share of ordinary share	KT	New York Stock Exchange, Inc.
Ordinary share, par value ￦5,000 per share*	KT	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, 2020, there were 241,842,130 ordinary shares, par value ￦5,000 per share, outstanding

(not including 19,269,678 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 whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.    Yes  ☒    No  ☐

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		1
	Item 3.A.	Selected Financial Data	1
	Item 3.B.	Capitalization and Indebtedness	4
	Item 3.C.	Reasons for the Offer and Use of Proceeds	4
	Item 3.D.	Risk Factors	4
Item 4.	Information on the Company		22
	Item 4.A.	History and Development of the Company	22
	Item 4.B.	Business Overview	23
	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	72
	Item 5.C.	Research and Development, Patents and Licenses, Etc.	75
	Item 5.D.	Trend Information	76
	Item 5.E.	Off-balance Sheet Arrangements	76
	Item 5.F.	Tabular Disclosure of Contractual Obligations	76
	Item 5.G.	Safe Harbor	76
Item 6.	Directors, Senior Management and Employees		76
	Item 6.A.	Directors and Senior Management	76
	Item 6.B.	Compensation	80
	Item 6.C.	Board Practices	80
	Item 6.D.	Employees	82
	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		88
	Item 9.A.	Offer and Listing Details	88
	Item 9.B.	Plan of Distribution	88
	Item 9.C.	Markets	88
	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	95
	Item 10.D.	Exchange Controls	95
	Item 10.E.	Taxation	100
	Item 10.F.	Dividends and Paying Agents	107
	Item 10.G.	Statements by Experts	107
	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	119

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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, ￦1,118.1 to US$1.00, ￦1,157.8 to US$1.00 and ￦1,088.0 to US$1.00 on December 31, 2018, 2019 and 2020, respectively.

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.

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 December 31, 2019 and 2020 and for each of the years in the

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three-year period ended December 31, 2020 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, 2019 and 2020 and for each of the years in the three year period ended December 31, 2020 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”). Beginning January 1, 2020, we have changed our accounting policy by adopting accounting treatments in accordance with agenda decisions for “Lease Term and Useful Life of Leasehold Improvements” issued by IFRS Interpretations Committee. We have adopted such changes in accounting policy retrospectively pursuant to IASB 8 Accounting Policies, Changes in Accounting Estimates and Errors and adjusted the comparative line items as of and for the year ended December 31, 2019. Accordingly, the financial information as of and for the years ended December 31, 2016, 2017 and 2018 have not been restated for the change in accounting policy. See “Item 5. Operating and Financial Review and Prospects – Item 5.A. Operating Results – Changes in Accounting Policies – Determination of Lease Term Considering Economic Penalty” and Note 41 of the notes to the Consolidated Financial Statements.

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.

Selected consolidated statement of operations data

	Year Ended December 31,
	2016		2017			2018			2019			2020
	(In billions of Won, except per share data)
Operating revenue	￦	23,164	￦	23,547		￦	23,436		￦	24,899		￦	24,441
Revenue		22,798		23,260			23,220			24,640			24,099
Others		366		287			216			259			341
Operating expenses		21,781		22,478			22,335			23,872			23,418
Operating profit		1,383		1,069			1,101			1,027			1,022
Finance income		296		406			374			424			499
Finance costs		515		645			436			432			507
Share of net profits (loss) of associates and joint ventures		3		(14	)		(5	)		(3	)		18
Profit before income tax		1,167		817			1,034			1,016			1,032
Income tax expense		335		271			315			320			285
Profit for the year	￦	832	￦	546		￦	719		￦	696		￦	746
Profit for the year attributable to:
Equity holders of the parent company	￦	745	￦	462		￦	646		￦	646		￦	701
Non-controlling interest	￦	87	￦	85		￦	74		￦	50		￦	45
Earnings per share attributable to the equity holders of the Parent Company during the period:
Basic earnings per share	￦	3,043	￦	1,884		￦	2,634		￦	2,634		￦	2,858
Diluted earnings per share	￦	3,041	￦	1,883		￦	2,634		￦	2,632		￦	2,858

2

Selected consolidated statement of financial position data

	As of December 31,
Selected Statement of Financial Position Data	2016			2017			2018			2019			2020
	(In billions of Won)
Assets:
Current assets:
Cash and cash equivalents	￦	2,900		￦	1,928		￦	2,703		￦	2,306		￦	2,635
Trade and other receivables, net		5,478			5,965			5,680			5,859			4,902
Other financial assets		721			973			995			868			1,203
Current income tax assets		2			9			4			68			2
Inventories, net		455			642			1,075			792			535
Assets held for sale		—			7			13			84			1
Other current assets		311			305			1,688			1,999			1,876
Total current assets		9,866			9,829			12,158			11,976			11,154
Non-current assets:
Trade and other receivables, net		709			829			843			1,182			1,251
Other financial assets		665			755			623			822			544
Property and equipment, net		14,312			13,562			13,068			13,785			14,206
Right-of-use assets		—			—			—			1,268			1,217
Investment property, net		1,148			1,190			1,091			1,387			1,368
Intangible assets, net		3,023			2,633			3,407			2,834			2,161
Investments in jointly controlled entities and associates		284			279			272			268			558
Deferred income tax assets		701			712			465			425			434
Other non-current assets		106			107			546			685			769
Total non-current assets		20,948			20,067			20,316			22,657			22,508
Total assets	￦	30,815		￦	29,896		￦	32,474		￦	34,632		￦	33,663
Liabilities and Equity:
Current liabilities:
Trade and other payables	￦	7,142		￦	7,426		￦	6,948		￦	7,597		￦	6,210
Borrowings		1,820			1,573			1,368			1,186			1,418
Other financial liabilities		0			37			1			1			2
Current income tax liabilities		103			83			250			66			232
Provisions		96			78			118			176			166
Deferred income		36			18			53			53			60
Other current liabilities		342			259			656			1,069			1,103
Total current liabilities		9,539			9,474			9,394			10,148			9,192
Non-current liabilities:
Trade and other payables		1,188			1,001			1,409			1,082			808
Borrowings		6,301			5,110			5,280			6,113			5,898
Other financial liabilities		108			149			163			149			261
Retirement benefit liabilities		378			395			561			366			378
Provisions		101			125			164			79			86
Deferred income		85			92			111			99			149
Deferred income tax liabilities		138			128			205			425			429
Other non-current liabilities		59			237			528			1,030			910
Total non-current liabilities		8,358			7,238			8,422			9,343			8,919
Total liabilities	￦	17,898		￦	16,712		￦	17,816		￦	19,492		￦	18,111
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		9,779			9,961			11,256			11,591			12,155
Accumulated other comprehensive income (expense)		(1	)		31			50			195			86
Other components of equity		(1,218	)		(1,205	)		(1,181	)		(1,170	)		(1,235	)
Total equity attributable to owners of the parent company		11,564			11,792			13,130			13,621			14,011
Non-controlling interest		1,353			1,392			1,529			1,520			1,540
Total equity		12,917			13,183			14,658			15,141			15,551
Total liabilities and equity	￦	30,815		￦	29,896		￦	32,474		￦	34,632		￦	33,663

3

Selected consolidated statement of cash flow data

	Year Ended December 31,
	2016			2017			2018			2019			2020
	(In billions of Won)
Net cash generated from operating activities	￦	4,771		￦	3,878		￦	4,010		￦	3,745		￦	4,740
Net cash used in investing activities		(3,485	)		(3,483	)		(2,704	)		(3,887	)		(3,761	)
Net cash used in financing activities		(943	)		(1,363	)		(532	)		(250	)		(648	)

Operating Data

	As of December 31,
	2016		2017		2018		2019		2020
Lines installed (thousands) (1)		24,858		24,343		23,660		23,315		22,553
Lines in service (thousands) (1)		11,871		11,220		10,655		10,068		9,475
Lines in service per 100 inhabitants (1)		23.0		21.7		20.6		19.6		18.3
Mobile subscribers (thousands)		18,892		20,015		21,120		21,922		22,305
Broadband Internet subscribers (thousands)		8,516		8,758		8,729		8,962		9,171

(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 recent years, each of our primary competitors has acquired a leading cable TV operator in Korea to significantly increase their market shares in the pay TV market, which has further intensified competition.

To a lesser extent, we also compete with various value-added service providers and network 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. We also face changes in the evolving landscape of the market for media and content services arising from the increasing popularity of global over-the-top (“OTT”) media services such as Netflix. The entrance of new service

4

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 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, competition has further intensified among the three network service providers, which has resulted 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 are required to be reported to the MSIT, which has 15 days to object to such changes. 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. The MSIT reserves the right to reallocate bandwidths in order to address the changing needs for bandwidth capacity of mobile service providers, the consideration for which may depend on the extent of the buildout of the service provider’s telecommunications network to utilize the relevant bandwidth. We made bandwidth license payments of ￦573 billion in 2018, ￦389 billion in 2019 and ￦367 billion in 2020. For our outstanding payment obligations relating to our bandwidth licenses as of December 31, 2020, 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.”

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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 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.

The ongoing global pandemic of a new strain of coronavirus (“COVID-19”) and any possible recurrence of other types of widespread infectious diseases, may adversely affect our business, financial condition or results of operations.

The COVID-19, an infectious disease caused by severe acute respiratory syndrome coronavirus 2 that was first reported to have been transmitted to humans in late 2019 and has spread globally, has materially and adversely affected the global economy and financial markets in recent months. The World Health Organization declared the COVID-19 as a pandemic in March 2020. In light of the Government’s recommendations for social distancing, we have periodically implemented remote work arrangements for a portion of our workforce, particularly for employees in areas severely impacted by the pandemic. While we do not believe that such arrangements have had a material adverse impact on our business, a prolonged outbreak of COVID-19 may result in further disruptions in the normal operations of our business, including disruptions in the operation of our facilities, delays in our network expansion projects, implementation of further work arrangements requiring employees to work remotely and restrictions on overseas and domestic business travel, which may lead to a reduction in labor productivity.

Other risks associated with a prolonged outbreak of COVID-19 or other types of widespread infectious diseases may potentially include:

• increase in unemployment among our customers who may not be able to meet payment obligations, which in turn may decrease demand for our products and services;

• service disruptions, outages and performance problems due to capacity constraints caused by an overwhelming number of people accessing our services simultaneously;

• disruptions in supply of mobile handsets or telecommunications equipment from our vendors;

• depreciation of the Won against major foreign currencies, which in turn may increase the cost of imported equipment necessary for expansion and enhancement of our telecommunications infrastructure; and

• impairments in the fair value of our investments in companies that may be adversely affected by the pandemic.

We are currently not able to estimate the duration or full magnitude of harm from COVID-19. In the event that COVID-19 or other types of widespread infectious diseases cannot be effectively and timely contained, our business, financial condition and results of operations may be adversely affected.

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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 in April 2019. Since then, we have expanded our coverage to 85 major cities in Korea, and we plan to further expand the coverage nationwide and increase the transmission speed of our 5G services. 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.

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. 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, in July 2020, KT Skylife Co., Ltd. (“KT Skylife”), in which we held a 49.99% interest as of December 31, 2020, was selected as the preferred bidder in connection with the acquisition of a controlling interest in Hyundai HCN Co., Ltd. (“HCN”), which is Korea’s fifth largest cable operator. In October 2020, KT Skylife proposed to acquire a 100.00% interest in HCN for ￦491 billion, and the transaction is expected to be completed in the second half of 2021. The HCN acquisition is currently pending regulatory approval, and certain terms and conditions of the transaction are subject to adjustments prior to closing.

While we plan to continue our search for suitable acquisition and joint venture opportunities, we cannot provide assurance that we will be able to identify 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.

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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 and the Internet Multimedia Broadcasting Services Act, which cover our IPTV services, our satellite TV services provided through KT Skylife (in which we held a 49.99% interest as of December 31, 2020), and cable TV services that we would provide through HCN, in which KT Skylife would hold a 100.0% interest upon consummation of its acquisition that is expected to be completed in the second half of 2021. The HCN acquisition is currently pending regulatory approval, and certain terms and conditions of the transaction are subject to adjustments prior to closing. 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, 2020, KT Skylife, HCN and we together had an aggregate market share of 35.9% 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. Accordingly, changes in our local telephone rates and mobile rates of SK Telecom are required to be reported to the MSIT, which has 15 days to object to such changes. 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 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. For instance, 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 Government may pursue additional measures to regulate the markets in which we compete. 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.

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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. 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.

Legal cases involving our charitable or political donations and other incidents and allegations, including matters connected to a scandal involving Ms. Soon-sil Choi, a confidante of former President Geun-hye Park, 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 of KT Corporation, with embezzlement and breach of fiduciary duty. Mr. Il Yung Kim, a former president of KT Corporation, was charged as a co-conspirator in the breach of fiduciary duty by Mr. Lee, and Mr. Yu-yeol Seo, a former president of KT Corporation, was charged as a co-conspirator in Mr. Lee’s embezzlement. On May 30, 2017, the Supreme Court of Korea confirmed the acquittal of Mr. Lee and Mr. Kim on the charge of breach of fiduciary duty, and reversed the appellate court judgment against Mr. Lee and Mr. Seo (which had sentenced both to a suspended prison term of 18 months, on probation for two years, for allegedly creating and embezzling off-the-book funds of ￦1.1 billion for personal use between 2009 and 2013) and remanded the case back to the Seoul High Court. On April 26, 2018, the Seoul High Court acquitted Mr. Lee and Mr. Seo of such charge. No indictment or charges of wrongdoing were brought against us or any of our current executives or employees in connection with such indictment of Mr. Lee, Mr. Seo, and Mr. Kim.

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 previous chief executive officer to hire (and later to change the employment positions of) two individuals, Mr. Dong-Soo Lee and Ms. Hye-Sung Shin. Mr. Lee was hired and later appointed as 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 in which Ms. Soon-sil Choi, a confidante of former President Park, effectively owns a 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, Playground recognized approximately ￦517 million of income from such activities. 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 November 2016, the Korean Prosecutor’s Office commenced investigations on former President Park and in April 2017 indicted the former President on charges of bribery, coercion and abuse of power, among others. In August 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

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the Constitutional Court decisions described above: (i) the employment and changes to the employment positions 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, which in August 2019 vacated the appellate court judgment against the former President on the bribery-related charges due to errors made in its sentencing process and remanded the case back to the Seoul High Court for retrial. In July 2020, the Seoul High Court sentenced former President Park upon retrial to a prison term of 15 years and a monetary fine of ￦18 billion for the bribery-related charges and a prison term of 5 years for the other charges including abuse of power. The prosecution appealed the appellate court’s decision to the Supreme Court of Korea, which in January 2021 rejected the appeal and affirmed the appellate court’s judgment, which became final and conclusive. No indictment or charges of wrongdoing were brought against us or any of our executives or employees in connection with such indictment of the former President.

In January 2018, the Korean Prosecutor’s Office 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 sponsorships 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 suspended 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 to the Seoul High Court, which in July 2020 found Mr. Jun guilty of the bribery charges, among others, and sentenced him to a suspended prison term of one year on probation for two years and an aggregate monetary fine of ￦200 million and not guilty of the charge in connection with soliciting financial sponsorship of ￦100 million from us. In March 2021, the Supreme Court of Korea affirmed the appellate court’s judgment against Mr. Jun, which became final and conclusive. 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 or providing gift cards to various lawmakers using corporate funds. This matter is currently being investigated by the Prosecutors’ Office.

In March 2019, the KT New Labor Union filed criminal complaints with the Seoul Central District Prosecutor’s Office against our previous chief executive officer, Mr. Chang-Gyu Hwang, alleging charges that include a criminal breach of fiduciary duty, in connection with management consulting (research and survey) contracts entered into between us and others, including certain former public officials, since November 2014. The investigation by the Prosecutor’s Office is ongoing.

In April 2019, the Seoul Southern District Prosecutor’s Office indicted four former executive officers, including Mr. Suk-chae Lee and Mr. Yu-yeol Seo, for charges of obstruction of business arising from allegedly engaging in a number of improper hiring during the public recruiting process of college graduates in the second half of 2012. In October 2019, the Seoul Southern District Court found the former executive officers guilty of the charges and sentenced Mr. Lee to a prison term of one year and Mr. Seo to a suspended prison term of eight months on probation for two years. Both the Prosecutor’s Office and the former executive officers appealed the court’s decision to the Seoul High Court, which in November 2020 sentenced Mr. Lee to a suspended prison term of one year and 6 months on probation for two years and Mr. Seo to a suspended prison term of eight months on

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probation for two years. In addition, the Seoul High Court found Mr. Lee guilty of bribery charges in relation to the improper hiring incident. Mr. Lee appealed the court’s decisions to the Supreme Court of Korea, where the case is currently pending. No indictment or charges of wrongdoing were brought against us or any of our current executives or employees in connection with such indictment of our former executive officers.

We are also cooperating with an investigation by the U.S. Securities and Exchange Commission (the “SEC”) related to the above-described matters and other related allegations regarding compliance with the U.S. Foreign Corrupt Practices Act. It is not possible to determine the outcome of any such investigations at this time, including the timing or terms of any potential resolution and what final costs, remediation, payments or other criminal or civil liability may occur. There can be no assurance that the SEC or another regulatory body will not make further regulatory inquiries or pursue further action. Furthermore, there can be no assurance that any outcome or any further developments relating to the above-mentioned matters, including adverse publicity, will not adversely affect our business, financial results, 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 related to our management of subscribers’ personal information. 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

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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 accepted applications from small business owners for financial assistance, which we provided 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 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 and other 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 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

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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 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. 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.

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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 held a 69.5% interest as of December 31, 2020.

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 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.

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 34.4% as of December 31, 2019 and 44.2% as of December 31, 2020. 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.

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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 June 16, 2021. 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.

We are subject to various laws and regulations in Korea and other jurisdictions, including the Monopoly Regulation and Fair Trade Act of Korea.

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 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.

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 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

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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 ￦7,316 billion total book value of debentures and borrowings outstanding as of December 31, 2020, ￦2,741 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.

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.

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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 operations.

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.

In particular, the ongoing COVID-19 pandemic has had an adverse impact on the Korean economy. Following the Government’s announcement of the first confirmed case of COVID-19 in Korea in January 2020, it has implemented a number of measures in order to contain the spread of the COVID-19 disease, including a nationwide order for social distancing, implementation of strict self-isolation and quarantine measures for those who may be infected, and the temporary closure of all school and other public facilities. In addition, the Government has undertaken a series of actions to mitigate the adverse impact of the COVID-19 pandemic on the Korean economy, including (i) lowering of The Bank of Korea’s policy rates, (ii) execution of a bilateral currency swap agreement with the U.S. Federal Reserve, (iii) provision of loans, guarantees and maturity extensions to eligible financial institutions, small and medium business enterprises and self-employed business owners facing liquidity crises; (iv) offering emergency relief payments for those impacted by the COVID-19 pandemic; and (v) establishment of the Key Industry Stabilization Fund in May 2020 to support businesses in certain key industries, such as the air transport and maritime industries. However, the impact of the on-going COVID-19 pandemic to the Korean economy in 2021 and for the foreseeable future remains highly uncertain.

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

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

• the occurrence of additional severe health epidemics;

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• adverse conditions or uncertainty 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, including as a result of the ongoing COVID-19 pandemic, deteriorating relations between the United States and China and increased uncertainties resulting from the United Kingdom’s exit from the European Union;

• adverse changes or volatility in foreign currency reserve levels, commodity prices (including oil prices), exchange rates;

• 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 removal of Korea from Japan’s “white list” of preferred trading nations in August 2019 and the controversy between Korea and China regarding the deployment of a Terminal High Altitude Area Defense System in Korea by the United States in March 2017 and the ensuing economic and other retaliatory measures by China against Korea during the remainder of 2017);

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

• deterioration in the financial condition or performance of small- and medium-sized enterprises and other companies in Korea due to the Government’s policies to increase minimum wages and limit working hours of employees;

• 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;

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

• social and labor unrest;

• substantial decreases in the market prices of Korean real estate;

• a substantial decrease in tax revenues and a substantial increase in the Government’s expenditures for fiscal stimulus measures, unemployment compensation and other economic and social programs, in particular in light of the Government’s ongoing efforts to provide emergency relief payments to households and emergency loans to corporations in need of funding in light of COVID-19, which, together, would likely lead to a national budget deficit as well as an increase in the Government’s debt;

• financial problems or lack of progress in the restructuring of Korean business groups, other large troubled companies, their suppliers or the financial sector;

• loss of investor confidence arising from corporate accounting irregularities and corporate governance issues concerning 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;

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• geopolitical uncertainty and risk of further attacks by terrorist groups around the world;

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

• hostilities or political or social tensions involving oil producing countries in the Middle East (including a potential escalation of hostilities between the United States and Iran) and Northern Africa and any material disruption in the global supply of oil or sudden increase in the price of oil;

• natural or man-made disasters that have a significant adverse economic or other impact on Korea or its major trading partners; 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 several rounds of nuclear tests since October 2006, including claimed detonations of hydrogen 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. 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, February 2019

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and June 2019, there can be no assurance that the level of tensions affecting the Korean peninsula will not 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 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

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offerings of ADSs and stock dividends or other distributions related to these ADSs) and (2) the number 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, 2020, 43.6% 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

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ownership percentage whenever new shares are issued. If we offer any rights to subscribe for 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

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electing our directors, who had previously been appointed by the Government under the Korea Telecom Act.

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. There are currently three mobile telephone service providers in Korea. 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 and platform service provider in Korea and one of the most advanced in Asia. In 2020, we announced our plans to transform ourselves into a digital telecommunications platform company as we strive to further expand and strengthen our digital platforms including in relation to our business-to-business (“B2B”), media, contents and financial services. Our principal services include:

• mobile voice and data telecommunications services based on 5G, 4G LTE and 3G W-CDMA technology;

• 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 corporate and other institutional customers;

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• media and content services, including IPTV, satellite TV, digital music services, e-commerce services, online advertising consulting services and digital comics and novels services;

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

• other business activities, including information technology and network services and 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 31.6% with approximately 22.3 million subscribers as of December 31, 2020;

• in fixed-line and VoIP telephone services, we had approximately 13.6 million subscribers, consisting of 10.4 million PSTN subscribers and 3.1 million VoIP subscribers as of December 31, 2020. As of such date, our market share of the fixed-line local telephone and VoIP services was 56.8%; and

• we are Korea’s largest broadband Internet access provider with approximately 9.2 million subscribers as of December 31, 2020, representing a market share of 41.1%.

For the year ended December 31, 2020, our operating revenue was ￦24,441 billion, our profit for the year was ￦746 billion and our basic earnings per share was ￦2,858. As of December 31, 2020, our total assets were ￦33,663 billion, total liabilities were ￦18,111 billion and total equity was ￦15,551 billion.

Our Services

The following table sets out our operating revenue by principal product categories and the respective percentage of total operating revenue in 2018, 2019 and 2020.

	For the Year Ended December 31,
	2018					2019					2020
Products and services	Billions of Won		%			Billions of Won		%			Billions of Won		%
Mobile services	￦	6,828		29.1	%	￦	6,795		27.3	%	￦	6,805		27.8	%
Fixed-line services:
Fixed-line and VoIP telephone services		1,708		7.3			1,579		6.3			1,464		6.0
Broadband Internet access services		2,113		9.0			2,177		8.7			2,256		9.2
Data communication services		1,048		4.5			1,111		4.5			1,107		4.5
Sub-total		4,869		20.8			4,867		19.5			4,827		19.7
Media and content services		2,262		9.7			2,516		10.1			2,638		10.8
Financial services		3,445		14.7			3,642		14.6			3,494		14.3
Others		2,743		11.7			2,885		11.6			3,084		12.6
Sale of goods (1)		3,289		14.0			4,194		16.8			3,593		14.7
Total operating revenue	￦	23,436		100.0	%	￦	24,899		100.0	%	￦	24,441		100.0	%

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(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.

Mobile Services

We provide mobile services based on 5G, 4G LTE and 3G W-CDMA technology. 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 in April 2019, and we have expanded our coverage to 85 major cities in Korea. We plan to further expand the coverage nationwide and increase the transmission speed of our 5G services. 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. 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.

Revenue related to mobile service accounted for 27.8% of our operating revenue in 2020. 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,
	2018		2019		2020
Average monthly revenue per subscriber (1)	￦	32,021	￦	31,625	￦	31,683
Number of mobile subscribers (in thousands)		21,120		21,922		22,305
LTE subscribers		16,971		17,153		16,174
W-CDMA subscribers		4,149		3,350		2,512
5G subscribers		—		1,419		3,619

(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, 2020, we had approximately 22.3 million subscribers, or a market share of 31.6%, which was the second largest among the three mobile service providers.

We market our mobile services primarily through independent exclusive dealers located throughout Korea. 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. We operate customer plazas in key areas 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.

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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 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 6.0% of our operating revenue in 2020. 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,
	2016		2017		2018		2019		2020
Total Korean population (thousands) (1)		51,696		51,799		51,826		51,850		51,829
PSTN and VoIP lines in service (thousands)		16,266		15,610		14,992		14,185		13,582
PSTN lines in service		12,791		12,201		11,637		11,052		10,449
Local lines in service		11,869		11,222		10,654		10,076		9,475
Group lines in service		921		979		983		976		973
VoIP lines in service		3,436		3,409		3,355		3,133		3,133
Fiber optic cable (kilometers)		732,873		764,802		784,088		847,497		867,051
Domestic long-distance call minutes (millions) (2)		1,507		1,126		892		744		620
Local call pulses (millions) (2)		2,161		1,285		974		804		638

(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.

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

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calls recorded by us and network service providers utilizing our international long-distance network in each specified category for each year in the five-year period ended December 31, 2020:

	Year Ended December 31,
	2016		2017		2018		2019		2020
	(In millions of billed minutes)
Incoming international long-distance calls		352.3		286.4		221.1		189.6		50.8
Outgoing international long-distance calls		155.1		125.9		101.1		78.8		59.5
Total		507.4		412.3		322.2		268.4		110.3

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 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 867,056 kilometers of fiber optic cables as of December 31, 2020, 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 9.2% of our operating revenue in 2020.

As of December 31, 2020, we had approximately 9.2 million broadband Internet subscribers, including approximately 5.9 million KT GiGA Internet service subscribers with enhanced data transmission speeds. In addition, we had approximately 5.5 million KT WiFi subscribers as of such date. We also sponsored approximately 130 thousand hot-spot zones nationwide for wireless connection as of December 31, 2020.

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

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December 31, 2020, we leased 275,131 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 2020.

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.

Media and Content Services

We offer a variety of media and content services, including IPTV, satellite TV, e-commerce services, digital music services, online advertising consulting services and digital comics and novels services. Media and content services accounted for 10.8% of our operating revenue in 2020. In addition, in July 2020, KT Skylife, in which we held a 49.99% interest as of December 31, 2020, was selected as the preferred bidder in connection with the acquisition of a controlling interest in HCN, which is Korea’s fifth largest cable TV operator. See “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results—Overview—Acquisitions and Disposals of Interests in Subsidiaries and Joint Ventures.”

IPTV

We offer high definition video-on-demand and real-time broadcasting and ultra-high-definition (“UHD”) IPTV services under the brand name “olleh 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. As part of our IPTV services, we also operate our OTT platform under the brand name “Seezn.” We had approximately 8.8 million IPTV subscribers as of December 31, 2020.

We are also leveraging our big data analytics capabilities and artificial intelligence technology to further enhance our IPTV services. We offer artificial intelligence-based “GiGA genie” service to our IPTV subscribers through a voice recognition speaker that also serves as the IPTV’s set-top box, which enables us to take advantage of big data analytics and enhance our product offerings as well as operate a more effective automated customer service center.

Satellite TV

We offer satellite TV services with features similar to our IPTV services through KT Skylife, in which we held a 49.99% interest as of December 31, 2020. As of December 31, 2020, we had approximately 4.0 million subscribers for our satellite TV services, including olleh TV Skylife combination services.

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

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which we held a 35.97% interest as of December 31, 2020. As of December 31, 2020, 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.

E-commerce Services

We offer TV home shopping, digital content distribution and information and communication technology (“ICT”) platform consulting services through KTH Co., Ltd. (“KTH”), in which we held a 67.1% interest on a consolidated basis as of December 31, 2020. Through KTH, 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.

We also offer mobile gift card services under the brand name “giftishow” and other mobile advertising solutions to corporate customers through KT mhows Co., Ltd. (“KT mhows”), in which we held a 76.0% interest as of December 31, 2020.

In November 2020, we announced plans to merge KTH and KT mhows, through which we expect to achieve vertical integration and pursue additional mobile commerce opportunities by leveraging KT mhows’ large corporate customer base with the e-commerce infrastructure and know-how of KTH. We currently expect to complete the merger by July 2021.

Online Advertising Consulting Services

We provide strategic advertising consulting services for the online advertising industry through our subsidiaries Nasmedia, Co., Ltd. (“Nasmedia”), in which we held a 42.8% interest as of December 31, 2020, and PlayD Co., Ltd. (“PlayD”), in which Nasmedia and we in the aggregate held a 70.4% interest as of December 31, 2020. 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.

Digital Comics and Novels Services

StoryWiz, which was established in February 2020 and in which we held a 100.0% interest as of December 31, 2020, specializes in producing and distributing digital comics and web novels as well as producing original video contents using our intellectual property rights. StoryWiz operates a web novel platform called Blice, through which many writers distribute their web novels. We support such writers in a variety of ways, such as holding web novel contests as well as providing funding for new and promising writers. We strive to further expand our intellectual property to movies, dramas and web comics, and we plan to distribute our original content through a wide range of IPTV and OTT platforms in Korea.

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

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controlling interest in BC Card, a leading credit card solutions provider in Korea in which we held a 69.5% interest as of December 31, 2020. As of such date, BC Card held a 34.0% interest in K Bank, an Internet-only bank that began its commercial operations in April 2017. Revenue from our financial services, which consist primarily of revenue from BC Card, accounted for 14.3% of our operating revenue in 2020.

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, 2020, we had approximately 17 million credit cards and approximately 6 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

K Bank 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, 2020, K Bank had approximately 2.2 million holders of deposit accounts, with total deposits of ￦3.7 trillion and outstanding loans of ￦3.0 trillion. Other shareholders of K Bank include Woori Bank, NH Investment & Securities, Co., Ltd., GS Retail Co., Ltd. and Hanwha Life Insurance Co., Ltd.

Pursuant to the Act on Special Cases Concerning Internet-Only Banks, starting from 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.

Other Businesses

We also engage in various business activities that extend beyond telecommunications and financial services, including real estate development. Our other businesses accounted for 12.6% of our operating revenue in 2020.

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Information Technology and Network Services

Digital transformation has increased in recent years, and the Government announced “Digital New Deal” initiatives in July 2020 to further accelerate such trend in Korea. Leveraging on our (i) data communications networks, (ii) infrastructure operational know-how and (iii) big data analytics capabilities, we believe that we are well-positioned to take advantage of the attractive opportunities in this era of digital transformation. In 2020, we launched our B2B brand, KT Enterprise, to better position ourselves to attract corporate customers that have digital transformation needs.

We offer a broad array of information technology and network services to our corporate and other institutional customers. Our range of systems integration 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 provide one-stop global ICT services specifically targeting multinational corporations and international agencies, which range from ICT infrastructure design and buildout to operational solutions that address their multinational needs. In addition, we provide consulting services to optimize energy consumption by corporate and other institutional customers, as well as security surveillance services ranging from buildout of monitoring systems to dispatching of security personnel.

We also operate Internet 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. Leveraging our Internet data centers as well as our data communications networks, we provide a wide range of cloud computing services that are tailored to address specific needs of our customers in public and private sectors.

We also offer a wide range of “KT DX platform” services for our corporate and other institutional customers that provide customized and integrated digital transformation services that address their technical infrastructure, platform and solution needs.

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 14.7% of our operating revenue in 2020.

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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, which is included in the monthly subscription rates that we charge to our customers.

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

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.

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The following table summarizes the terms of our representative 5G and LTE mobile service plans that we currently offer:

Plan	Monthly Rate		Voice Calls		Video Calls		Data Transmission	Additional Features
5G Super Plan Premium Choice	￦	130,000		Unlimited		300 min.	Unlimited	•    Unlimited data roaming at 3 Mbps •    Handset insurance using reward points •    No service fee for additional smart device •    Free contents (subscribers can choose two services among Movie / Music / Netflix)
5G Super Plan Special Choice	￦	110,000		Unlimited		300 min.	Unlimited	•    Unlimited data roaming at 100 kbps •    Handset insurance using reward points •    No service fee for additional smart device •    Free contents (subscribers can choose two services among Movie / Music / Netflix)
5G Super Plan Special	￦	100,000		Unlimited		300 min.	Unlimited	•    Unlimited data roaming at 100 kbps •    Handset insurance using reward points •    No service fee for additional smart device
5G Super Plan Basic Choice	￦	90,000		Unlimited		300 min.	Unlimited	•    Unlimited data roaming at 100 kbps •    Free contents (subscribers can choose two services among Movie / Music / Netflix)
5G Super Plan Basic		￦80,000		Unlimited		300 min.	Unlimited	•    Unlimited data roaming at 100 kbps
5G Simple		￦69,000		Unlimited		300 min.	Unlimited, but decelerate to 5 Mbps after 110 GB
5G Slim		￦55,000		Unlimited		300 min.	Unlimited, but decelerate to 1 Mbps after 8 GB
5G Save		￦45,000		Unlimited		300 min.	Unlimited, but decelerate to 400 kbps after 5 GB
Data On Premium		￦89,000		Unlimited		300 min.	Unlimited	•    Handset insurance using reward points •    No service fee for additional smart device •    Media package offering music, video, webtoon and movie content.

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Plan	Monthly Rate	Voice Calls	Video Calls	Data Transmission	Additional Features
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 Basic	￦33,000	Unlimited	50 min.	1.4 GB with an option to transfer data from and into the next month’s usage

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, 2018		January 1, 2019		January 1, 2020
KT	￦	13.1	￦	11.6	￦	10.6
SK Telecom		13.1		11.6		10.6
LG U+		13.1		11.6		10.6

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 required to be reported to the MSIT, which has 15 days to object to such changes. 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.

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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 ￦14.50 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.

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 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, 2018		January 1, 2019		January 1, 2020
SK Telecom	￦	13.1	￦	11.6	￦	10.6
LG U+		13.1		11.6		10.6

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, 2018		January 1, 2019		January 1, 2020
Local access (1)	￦	8.7	￦	7.8	￦	7.6
Single toll access (2)		10.0		9.2		8.6
Double toll access (3)		12.7		12.2		11.2

Source: The MSIT.

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

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(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 ￦27,500, which may be waived if the subscriber opts for self-installation.

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
Internet Max 100M	￦	39,600	￦	22,000	100 Mbps	None

(1) Data transmission speed is reduced to 100 Mbps 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 ￦7,700 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.

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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		270	(6)	•    Prime movie package that provides access to more than 28,000 video-on-demand contents. •    Catch-on & Plus channel dedicated to latest popular movies and dramas. •    Discounts on online TV home shopping purchases. •    Monthly coupon of ￦10,000 for video-on-demand plus 25% discount on all such contents.
TV Slim	￦16,500	￦13,200		238	(3)
Olleh TV Skylife
TV Entertainment	￦31,020	￦24,816		225	(5)	•    Monthly coupon of ￦10,000 for video-on-demand.
TV Slim	￦16,500	￦13,200		206	(5)

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. The majority of our subscribers participate 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 monthly 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

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Telecom and LG U+ (including their affiliates). Over time, 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 recent years, each of our primary competitors has acquired a leading cable TV operator in Korea to significantly increase their market shares in the pay TV market, which has further intensified competition.

To a lesser extent, we also compete with various value-added service providers and network 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 also face changes in the evolving landscape of the market for media and content services arising from the increasing popularity of global OTT media services such as Netflix.

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, competition has further intensified among the three network service providers, which has resulted 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 are required to be reported to the MSIT, which has 15 days to object to such changes. 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, 2018		31.8		46.9		21.3
December 31, 2019		31.8		46.0		22.1
December 31, 2020		31.6		44.8		23.6

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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, 2018		65.1		14.8		12.6
December 31, 2019		64.9		14.6		12.7
December 31, 2020		64.6		14.5		12.6

Source: Korea Telecommunications Operators Association.

Broadband Internet Access Services

	Market Share (%)
	KT Corporation		SK Broadband		LG U+		Others
December 31, 2018		41.0		25.4		18.9		14.7
December 31, 2019		40.9		25.6		19.6		13.9
December 31, 2020		41.1		29.0		20.3		9.6

Source: The MSIT.

Pay TV Services

	Market Share (%)
	KT Corporation (1)		SK Broadband		LG U+
December 31, 2018		31.2		14.1		12.0
December 31, 2019		31.6		15.0		12.9
December 31, 2020		32.2		16.1		14.1

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) registration of network service providers and licensing of select services (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 network service providers, as well as supervision of reporting requirements of standard telecommunications service/user contracts.

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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 Personal Information Protection Act, telecommunications service providers are also required to protect personal information of their customers. Generally, when a telecommunications service provider intends to 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. Under the Personal Information Protection Act, any enterprise, including 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 paid broadcasting 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, the MSIT may object to the rates set by a market-dominating business entity within 15 days from the date of receipt of such report if there is a high risk of (i) harming the users’ interests (including unfair discrimination against specific users based on contract length and usage volume with such service provider) or (ii) harming fair competition (including the provision of telecommunication services at unfair rates compared to the wholesale price offered by other telecommunications service providers). In 1997, the MSIP designated us for local telephone service and SK Telecom for mobile service as market-dominating business entities, which currently remains in effect. As a result, changes in our local telephone rates and in the mobile rates of SK Telecom are required to be reported to the MSIT, which has 15 days to object to such changes. 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

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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.

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, broadband 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

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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. In April 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, 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.

All telecommunications service providers must also provide compensation to their users in the following cases: (i) damage is caused to the user in connection with the service provider’s provision of telecommunication services (including from disruptions in service) and (ii) damage is caused to the user due to the reasons stated in such user’s complaint addressed to the service provider or a delay in the service provider’s processing of such complaint. However, if damage to a user is caused by force majeure, or if damage is caused intentionally by, or due to the negligence of, the user, the service provider’s liability for any compensation to such user is mitigated or absolved. In cases where the provision of telecommunication services is disrupted, the service provider must inform its user of the disruption as well as the standards and procedures for obtaining compensation for any damages.

In addition, if the number of users and the network traffic of a value-added service provider exceeds a certain threshold set by the MSIT, such value-added service provider must secure adequate measures to provide stable services to its users, which may require cooperation with other network service providers.

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

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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, 2020, 43.6% 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.

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.

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 87.5% of our subscribers as of December 31, 2020 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 held a 69.5% interest as of December 31, 2020, 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

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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) ￦20 billion, where the SCFB company engages in no more than two kinds of core businesses and (ii) ￦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).

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.

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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.

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, 2020, the net book value of our property and equipment was ￦14,206 billion, of which ￦3,643 billion is accounted for by the net book value of our land, buildings and structures. As of December 31, 2020, the net book value of our investment properties, which is accounted for separately from our property and equipment, was ￦1,368 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.

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Mobile Networks

Our mobile network architecture includes the following components:

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

• centralized centers, which are physical locations with baseband units of base transceiver stations;

• core networks, which connect to and control the base transceiver stations and provide the gateway to other networks and services; 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 22.6 million lines connected to local exchanges and 2.3 million lines connected to toll exchanges as of December 31, 2020.

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.

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 20.1 Tbps as of December 31, 2020. 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, 2020, our IP premium network had 4,828 lines installed to provide mobile data services, 3,236 lines installed to provide IPTV services and a total capacity to handle up to 4.0 Tbps of IPTV, voice, mobile data and virtual private network (“VPN”) service traffic.

Access Lines

As of December 31, 2020, we had 22.9 million access lines installed, which allow us to reach virtually all homes and businesses in Korea. As of December 31, 2020, we had approximately 22.7 million broadband lines with speed of at least 50 Mbps that enable us to deliver broadband Internet access and multimedia contents to our customers.

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Transmission Networks

Our domestic fiber optic cable network consisted of 867,056 kilometers of fiber optic cables as of December 31, 2020 of which 132,445 kilometers of fiber optic cables are used to connect our backbone network and 734,611 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 Packet Optical Transport Network (“POTN”), 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 53 relay sites as of December 31, 2020.

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 one satellite teleport in Kumsan. 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, 2020, our international telecommunications networks were directly linked to approximately 300 telecommunications service providers in various international destinations and are routed through our three international switching centers in Seoul, Daejeon and Busan.

As of December 31, 2020, our international Internet backbone with capacity of approximately 3,660 Gbps is connected to approximately 300 Internet service providers through our three Internet gateways in Hyehwa, Guro and Busan. In addition, we operate a broadcasting backbone with capacity of 1.1 Gbps to transmit broadcasting 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

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

• the ICT segment, which consists of KT Corporation on a standalone basis that is primarily engaged in providing various telecommunications and platform services to individual, household and corporate customers as well as selling handsets;

• the finance segment, which engages in providing various financial services such as credit card services and value-added network and payment gateway services;

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

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

Our future performance will depend at least in part on Korea’s general economic 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” and “—The ongoing global pandemic of a new strain of coronavirus (“COVID-19”) and any possible recurrence of other types of widespread infectious diseases, may adversely affect our business, financial condition or results of operations.” 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

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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. The MSIT reserves the right to reallocate bandwidths in order to address the changing needs for bandwidth capacity of mobile service providers, the consideration for which may depend on the extent of the buildout of the service provider’s telecommunications network to utilize the relevant bandwidth.

We made bandwidth license payments of ￦573 billion in 2018, ￦389 billion in 2019 and ￦367 billion in 2020. The following table sets forth our outstanding payment obligations relating to our bandwidth licenses as of December 31, 2020.

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
900 MHz (1)	20 MHz	July 1, 2011	￦	251	￦	126		2011	￦	9	2011 to 2021
1.8 GHz (1)	20 MHz	July 1, 2011	￦	194	￦	97		2011	￦	9	2011 to 2021
1.8 GHz (1)	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 (1)	40 MHz	December 4, 2016	￦	569	￦	142		2016	￦	85	2016 to 2021
3.5 GHz	100 MHz	December 1, 2018	￦	968	￦	242		2018	￦	73	2018 to 2028
28 GHz (2)	800 MHz	December 1, 2018	￦	208	￦	52		2018	￦	31	2018 to 2023

(1) These licenses are subject to renewal in 2021, which terms remain subject to negotiation with the MSIT. The consideration for renewal of such licenses may depend on the extent of the buildout of the service provider’s communications network to utilize the relevant bandwidth.

(2) In 2020, we recognized an impairment loss of ￦191 billion in relation to the 28 GHz spectrum 800 MHz bandwidth license, as the carrying amount of such license exceeded the recoverable amount.

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

The telecommunications industry is characterized by continued advances and improvements in telecommunications technology, and we have been continually researching and implementing network upgrades and launching additional telecommunications services to maintain our competitiveness. In recent years, we have made extensive efforts to continue to 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 in April 2019, and we have expanded our coverage to 85 major cities in Korea. We plan to further expand the coverage nationwide and increase the transmission speed of our 5G services.

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

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(which include capitalized expenses) on research and development were ￦273 billion in 2018, ￦254 billion in 2019 and ￦230 billion in 2020. We plan to continue to invest in researching and implementing network upgrades, which will entail additional operating expenses as well as capital expenditures.

Fee Discounts and Adjustments to the Rates for Our Telecommunications Services

We 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 monthly 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.”

Changes in our local telephone rates are required to be reported to the MSIT, which has 15 days to object to such changes. 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 applicable to mobile subscribers who elect not to receive handset subsidies from 20.0% to 25.0% starting in September 2017.

The Government may pursue additional measures to regulate the markets in which we compete. 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, in July 2020, KT Skylife, in which we held a 49.99% interest as of December 31, 2020, was selected as the preferred bidder in connection with the acquisition of a controlling interest in HCN, which is Korea’s fifth largest cable operator. In October 2020, KT Skylife proposed to acquire a 100.00% interest in HCN for ￦491 billion, and the transaction is expected to be completed in the second half of 2021. The HCN acquisition is currently pending regulatory approval, and certain terms and conditions of the transaction are subject to adjustments prior to closing. The identification of suitable acquisition candidates can be difficult, time-consuming and costly, and 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

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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 ￦2,101 billion in 2018, ￦2,466 billion in 2019 and ￦2,470 billion in 2020. 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 the launch of our 5G mobile services 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.

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 consolidated 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 derivatives and financial assets;

• amortization of contract assets, contract liabilities and contract cost assets;

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• income taxes;

• post-employment benefit liabilities;

• provisions; and

• lease term.

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, 2020 are summarized as follows:

	Year Ended December 31,
	2018			2019			2020
	(In millions of Won)
Balance at beginning of year	￦	523,799		￦	453,746		￦	378,999
Provision		113,065			60,193			139,957
Reversal or written-off		(185,117	)		(135,096	)		(86,555	)
Changes in the scope of consolidation		—			—			90,825
Others		1,999			156			8,693
Balance at end of year	￦	453,746		￦	378,999		￦	531,919

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 notes to 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 of the notes 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

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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 7.43% to 13.07% (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. For example, in 2019, we recognized impairment loss of ￦39 billion in relation to KT Skylife, as the carrying amount of cash-generating units exceeded the recoverable amount, and we recognized such impairment loss as operating expense in the consolidated statement of profit or loss. In 2020, we recognized an impairment loss of ￦191 billion in relation to the 28GHz spectrum 800 MHz bandwidth license, as the carrying amount of such license exceeded the recoverable amount, and we recognized such impairment loss as other expenses in the consolidated statement of profit or loss. See Note 13 of the notes to the Consolidated Financial Statements.

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.

Valuation and Impairment of Derivatives and 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.

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

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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.

Amortization of Contract Assets, Contract Liabilities and Contract Cost Assets

We recognize revenue when we satisfy the performance obligations specified in a customer contract by transferring the goods or services to the customer. With the application of IFRS 15, we allocate a transaction price for such revenue recognition to each performance obligation based on relative standalone selling prices of the goods or services provided to the customer.

We have identified two main performance obligations: (i) provision of telecommunications services and (ii) sale of handsets. In order to allocate a transaction price to each performance obligation on a relative standalone selling price basis, we are required to determine such standalone selling price at the inception of the contract based on the price for such good or service that we have charged in the past to similar customers under similar circumstances. We recognize such allocated amounts as contract assets or contract liabilities. Under IFRS 15, we are also required to capitalize as assets the incremental costs of obtaining a new contract, which include commission fees that we pay to authorized dealers when new customers subscribe for our telecommunications services. Such contract cost assets, as well as other contract assets and contract liabilities, are amortized over the remaining expected period of benefit of a customer contract.    

We believe that the estimates and assumptions made that are related to amortization of contract assets, contract liabilities and contract cost assets are critical accounting estimates because they require our management to make assessments about the expected period of benefit of customer contracts as well as the standalone selling prices of our goods and services. After taking into account historical data, we apply estimates and assumptions that we believe to be reasonable, but which are unpredictable and inherently uncertain. The use of alternative estimates and assumptions would result in different impacts on our results of operations.

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.

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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 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 of the notes to the Consolidated Financial Statements.

Lease Term

In determining the lease term, we consider the facts and circumstances that create economic incentives for the lessee to exercise an extension option, or to not exercise a termination option. The periods covered by the extension option (or the periods covered by the termination option) are only included in the lease term if it is reasonably certain that the lease will be extended (or not terminated).

For leases of property, machinery and communication line facilities, the following factors are typically the most relevant to determining the lease term:

• If there are significant penalties to terminate (or not extend), we are typically reasonably certain that we will extend (or not terminate) such lease.

• If any leasehold improvements are expected to have a significant remaining value, we are typically reasonably certain that we will extend (or not terminate) such lease.

• Otherwise, we consider other factors including historical lease durations and the costs and any disruption to our business that may result from replacing the leased asset.

Most options to extend leases for offices, retail stores and vehicles have not been included as lease liability because we could replace such assets without any significant costs or disruption to our business.

The lease term is reassessed if an option is actually exercised (or not exercised) or we become obliged to exercise (or not exercise) an option. The assessment of reasonable certainty is revised only if a significant event or a significant change in circumstances occurs, which affects the prior assessment and is within the control of the lessee. See Notes 2.23, 3.9 and 41 of the notes to the Consolidated Financial Statements.

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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, 2018, 2019 and 2020 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,
	2018		2019			2020
	(In millions of Won)
Operating profit under IFRS as issued by the IASB	￦	1,100,860	￦	1,026,970		￦	1,022,333
Effect of changes in operating income presentation		103,897		172,253			218,323
Revenue recognition of development, sale of real estate, etc.		56,765		(39,657	)		(56,549	)
Operating profit under K-IFRS	￦	1,261,522	￦	1,159,566		￦	1,184,107

	For the Year Ended December 31,
	2018			2019			2020
	(In millions of Won)
Net income under IFRS as issued by the IASB	￦	719,412		￦	695,868		￦	746,256
Profit before income tax
Revenue recognition of development, sale of real estate, etc.		56,765			(39,657	)		(56,549	)
Income tax		(13,872	)		9,731			13,685
Profit for the year under K-IFRS	￦	762,305		￦	665,942		￦	703,392

Changes in Accounting Policies—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”).

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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

Changes in Accounting Policies—Adoption of IFRS 16

The IASB issued IFRS 16 Leases (“IFRS 16”) for recognizing as assets and liabilities all leases which lease terms are over 12 months and the underlying assets are not low value assets. Upon adoption of IFRS 16, we began to recognize right-of-use assets and lease liabilities representing our obligation to make lease payments, which had previously been classified as “operating leases” under the principles of IAS 17. We have adopted IFRS 16 from January 1, 2019 and applied the modified retrospective approach, and recognized the cumulative impact of initially applying the standard as an adjustment to retained earnings as of January 1, 2019, the period of initial application. Accordingly, the financial information related to periods prior to January 1, 2019 have not been restated for the adoption of IFRS 16 and continue to be presented under IAS 17.

The adjustments made to line items presented in the consolidated statement of financial position on January 1, 2019 due to the change from IAS 17 applied previously to IFRS 16 are as follows:

• property and equipment decreased by ￦210 billion;

• intangible assets decreased by ￦26 billion;

• right-of-use assets increased by ￦900 billion;

• investment properties increased by ￦47 billion;

• lease receivables increased by ￦15 billion;

• prepayments decreased by ￦0.008 billion;

• prepaid expenses decreased by ￦84 billion;

• other liabilities increased by ￦0.6 billion;

• lease liabilities increased by ￦643 billion; and

• revenue increased by ￦0.8 billion.

The net impact on retained earnings on January 1, 2019 was a decrease of ￦4 billion.

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Changes in Accounting Policies – Determination of Lease Term Considering Economic Penalty

Beginning January 1, 2020, we have changed our accounting policy by adopting accounting treatments in accordance with agenda decisions for “Lease Term and Useful Life of Leasehold Improvements” issued by IFRS Interpretations Committee. As a result, we began determining the lease term as the non-cancellable period of a lease, together with both (i) periods covered by an option to extend the lease, if the lessee is reasonably certain that it will exercise such option and (ii) periods covered by an option to terminate the lease, if the lessee is reasonably certain that it will not exercise such option. In cases where the lessee and the lessor each has the right to terminate the lease without permission from the other party, we began to take into consideration a termination penalty when determining the period for which the contract is enforceable. We have adopted such changes in accounting policy retrospectively pursuant to IASB 8 Accounting Policies, Changes in Accounting Estimates and Errors and adjusted the comparative line items as of and for the year ended December 31, 2019. Accordingly, the financial information as of and for the year ended December 31, 2018 have not been restated for the change in accounting policy. For a discussion of the adoption of the change in accounting policy in relation to the lease term, see Note 41 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 2020, and which have not been adopted early by us, see Note 2.2 of the notes to the Consolidated Financial Statements.

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

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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; and

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

Ø data communication services, 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 digital music services, e-commerce services, online advertising consulting services and digital comics and novels services;

• financial service revenue, primarily consisting of fees from credit card services provided by BC Card, our consolidated subsidiary in which we held a 69.5% interest as of December 31, 2020;

• revenue from our miscellaneous business activities categorized as “others,” including information technology and network services and rental of real estate; and

• 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 costs 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;

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• 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.

Operating Results—2019 Compared to 2020

The following table presents selected income statement data and changes therein for 2019 and 2020:

	For the Year Ended December 31,					Changes
						2019 vs. 2020
	2019			2020		Amount			%
	(In billions of Won)
Operating revenue	￦	24,899		￦	24,441	￦	(459	)		(1.8	)%
Operating expenses		23,872			23,418		(454	)		(1.9	)
Operating profit		1,027			1,022		(5	)		(0.5	)
Finance income		424			499		74			17.5
Finance costs		432			507		75			17.4
Share of net profits (losses) of associates and joint venture		(3	)		18		21			N.A.
Profit before income tax		1,016			1,032		16			1.5
Income tax expense		320			285		(35	)		(10.8	)
Profit for the year	￦	696		￦	746	￦	50			7.2	%

N.A. means not applicable.

Operating Revenue

The following table presents a breakdown of our operating revenue and changes therein for 2019 and 2020:

	For the Year Ended December 31,				Changes
					2019 vs. 2020
Products and services	2019		2020		Amount			%
	(In billions of Won)
Mobile services	￦	6,795	￦	6,805	￦	10			0.1	%
Fixed-line services:
Fixed-line and VoIP telephone services		1,579		1,464		(115	)		(7.3	)
Broadband Internet access services		2,177		2,256		79			3.6
Data communication services		1,111		1,107		(3	)		(0.3	)
Sub-total		4,867		4,827		(40	)		(0.8	)
Media and content services		2,516		2,638		121			4.8
Financial services		3,642		3,494		(148	)		(4.1	)
Others		2,885		3,084		198			6.9
Sale of goods (1)		4,194		3,593		(601	)		(14.3	)
Total operating revenue	￦	24,899	￦	24,441	￦	(459	)		(1.8	)%

(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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Total operating revenue decreased by 1.8%, or ￦459 billion, from ￦24,899 billion in 2019 to ￦24,441 billion in 2020, primarily due to decreases in revenue from sale of goods and fixed-line and VoIP telephone services, which impact was partially offset by increases in revenue from media and content services and financial services.

Mobile Services

Our mobile services revenue increased by 0.1%, or ￦10 billion, from ￦6,795 billion in 2019 to ￦6,805 billion in 2020, primarily due to increases in our mobile subscribers and average revenue per user, which were offset in part by a decrease in our roaming revenue due to a significant decrease in international travel during the COVID-19 pandemic.

We recorded a 1.7% increase in our mobile subscribers from approximately 21.9 million (including 1.4 million subscribers of 5G services) as of December 31, 2019 to approximately 22.3 million (including 3.6 million subscribers of 5G services) as of December 31, 2020.

Our average revenue per user increased from ￦31,625 in 2019 to ￦31,683 in 2020 mainly due to an increase of 5G subscribers.

Fixed-line Services

Our fixed-line services revenue decreased by 0.8%, or ￦40 billion, from ￦4,867 billion in 2019 to ￦4,827 billion in 2020, reflecting a decrease in our revenue from fixed-line and VoIP telephone services, which impact was 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 7.3%, or ￦115 billion, from ￦1,579 billion in 2019 to ￦1,464 billion in 2020, primarily due to decreases in subscribers reflecting continued decrease in demand for such services. Our number of PSTN and VoIP lines in service decreased from 14.1 million as of December 31, 2019 to 13.6 million as of December 31, 2020.

Broadband Internet Access Services. Our broadband Internet access services revenue increased by 3.6%, or ￦79 billion, from ￦2,177 billion in 2019 to ￦2,256 billion in 2020, primarily as a result of an increase in the number of subscribers to our premium services. The number of our KT GiGA Internet service subscribers increased from approximately 5.5 million as of December 31, 2019 to approximately 5.9 million as of December 31, 2020.

Data Communication Services. Our data communication services revenue decreased by 0.3%, or ￦3 billion, from ￦1,111 billion in 2019 to ￦1,107 billion in 2020 primarily due to a decrease in revenue from our co-location and server leasing services offered to corporate customers.

Media and Content Services

Our media and content services revenue increased by 4.8%, or ￦121 billion, from ￦2,516 billion in 2019 to ￦2,638 billion in 2020 primarily due to an increase in the number of IPTV subscribers from approximately 8.4 million as of December 31, 2019 to approximately 8.8 million as of December 31, 2020, as well as an increase in revenue of Genie Music Corporation.

Financial Services

Financial services revenue decreased by 4.1%, or ￦148 billion, from ￦3,642 billion in 2019 to ￦3,494 billion in 2020 primarily due to a decrease in fees from credit card services of BC Card as a result of a reduction in the usage of credit cards during the COVID-19 pandemic.

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Others

Other operating revenue increased by 6.9%, or ￦198 billion, from ￦2,885 billion in 2019 to ￦3,084 billion in 2020, primarily due to increases in revenue from our information technology and network services, particularly from systems integration services and the operation of Internet data centers.

Sale of Goods

Revenue from sale of goods decreased by 14.3%, or ￦601 billion, from ￦4,194 billion in 2019 to ￦3,593 billion in 2020, primarily due to decreases in revenue from sales of mobile handsets and residential units and commercial real estate developed by KT Estate in 2020 compared to 2019. The sale of mobile handsets decreased in 2020 primarily due to a slowdown in consumption as a result of the COVID-19 pandemic. The sale of residential units and commercial real estate developed by KT Estate in 2020 decreased due to the slowdown in the real estate market as a result of COVID-19.

Operating Expenses

The following table presents a breakdown of our operating expenses and changes therein for 2019 and 2020:

	For the Year Ended December 31,				Changes
					2019 vs. 2020
	2019		2020		Amount			%
	(In billions of Won)
Salaries and wages	￦	3,974	￦	4,124	￦	149			3.8	%
Depreciation		2,530		2,605		75			3.0
Depreciation of right-of-use assets		443		404		(38	)		(8.7	)
Amortization of intangible assets		657		625		(32	)		(4.8	)
Commissions		1,115		965		(150	)		(13.4	)
Interconnection charges		534		500		(34	)		(6.4	)
International interconnection fee		240		173		(68	)		(28.2	)
Purchase of inventories		4,454		3,682		(772	)		(17.3	)
Changes of inventories		283		257		(26	)		(9.2	)
Sales commission		2,316		2,337		21			0.9
Service cost		1,610		2,103		493			30.6
Utilities		333		361		28			8.4
Taxes and dues		278		283		5			2.0
Rental expenses		193		136		(57	)		(29.5	)
Insurance premium		82		71		(11	)		(13.8	)
Installation fee		155		132		(23	)		(14.9	)
Advertising expenses		150		132		(18	)		(11.8	)
Research and development expenses		165		157		(8	)		(4.9	)
Card service costs		3,067		2,942		(125	)		(4.1	)
Others		1,293		1,429		136			10.6
Total operating expenses	￦	23,872	￦	23,418	￦	(454	)		(1.9	)%

Total operating expenses decreased by 1.9%, or ￦454 billion, from ￦23,872 billion in 2019 to ￦23,418 billion in 2020 primarily due to decreases in purchase of inventories, commissions and card service costs, which impact was partially offset by increases in service costs and salaries and wages. Specifically:

• Our purchase of inventories decreased by 17.3%, or ￦772 billion, from ￦4,454 billion in 2019 to ￦3,682 billion in 2020 primarily due to a decrease in purchases of mobile handsets (consisting of a decrease in the total number of mobile handsets (mostly smartphones) and a decrease in the per-unit price of handsets).

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• Commissions decreased by 13.4%, or ￦150 billion, from ￦1,115 billion in 2019 to ￦965 billion in 2020 primarily due to a decrease in commissions that we paid to call centers.

• Card service costs decreased by 4.1%, or ￦125 billion, from ￦3,067 billion in 2019 to ￦2,942 billion in 2020 primarily due to a decrease in the card service costs of BC Card as a result of a slowdown in the usage of credit cards during the COVID-19 pandemic.

These factors were partially offset by the following:

• Service costs increased by 30.6%, or ￦493 billion, from ￦1,610 billion in 2019 to ￦2,103 billion in 2020 primarily due to service costs associated with the development of IT services for KTDS Co., Ltd. and the recognition of service costs incurred by KT Engineering Co., Ltd., in which we acquired a controlling interest in 2020.

• Salaries and wages increased by 3.8%, or ￦149 billion, from ￦3,974 billion in 2019 to ￦4,124 billion in 2020 primarily due to an increase in wages as well as the consolidation of salaries and wages of certain subsidiaries, such as KT Engineering Co., Ltd., in which we acquired a controlling interest in 2020.

Operating Profit

Due to the factors described above, our operating profit decreased by 0.5%, or ￦5 billion, from ￦1,027 billion in 2019 to ￦1,022 billion in 2020. Our operating margin, which is operating profit as a percentage of operating revenue, was 4.1% in 2019 and 4.2% in 2020.

Finance Income (Costs)

The following table presents a breakdown of our finance income and costs and changes therein for 2019 and 2020:

	For the Year Ended December 31,				Changes
					2019 vs. 2020
	2019		2020		Amount			%
	(In billions of Won)
Interest income	￦	283	￦	271	￦	(12	)		(4.3	)%
Gain on foreign currency transactions		25		17		(7	)		(28.9	)
Gain on foreign currency translation		18		164		146			814.1
Gain on settlement of derivatives		9		9		0			4.2
Gain on valuation of derivatives		77		0		(77	)		(99.8	)
Others		13		37		24			187.4
Total finance income	￦	424	￦	499	￦	74			17.5	%
Interest expenses	￦	278	￦	264	￦	(15	)		(5.3	)%
Loss on foreign currency transactions		30		28		(2	)		(8.1	)
Loss on foreign currency translation		94		26		(68	)		(72.0	)
Loss on settlement of derivatives		0		1		1			6,930.0
Loss on valuation of derivatives		16		164		148			932.1
Loss on disposal of trade receivables		11		8		(3	)		(27.8	)
Others		2		16		14			617.5
Total finance costs	￦	432	￦	507	￦	75			17.4	%

Our net loss on foreign currency transactions increased by 81.8%, or ￦5 billion, from ￦6 billion in 2019 to ￦10 billion in 2020 and we recorded a net loss on foreign currency translations of

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￦76 billion in 2019 compared to a net gain on foreign currency translation of ￦138 billion in 2020, as the Won depreciated against the Dollar in 2019 but appreciated against the Dollar in 2020. In terms of the market average exchange rates announced by Seoul Money Brokerage Services, Ltd., the Won depreciated from ￦1,118.1 to US$1.00 as of December 31, 2018 to ￦1,157.8 to US$1.00 as of December 31, 2019, but appreciated to ￦1,088.0 to US$1.00 as of December 31, 2020. Against such fluctuations, we recorded a net gain on valuation of derivatives of ￦61 billion in 2019 compared to a net loss on valuation of derivatives of ￦164 billion in 2020, and our net gain on transactions of derivatives decreased by 11.2%, or ￦1 billion, from ￦9 billion in 2019 to ￦8 billion in 2020.

Our interest income decreased by 4.3%, or ￦12 billion, from ￦283 billion in 2019 to ￦271 billion in 2020 primarily due to a general decrease in the weighted-average interest rate applicable to our bank deposits.

Our interest expenses decreased by 5.3%, or ￦15 billion, from ￦278 billion in 2019 to ￦264 billion in 2020 primarily due to a general decrease in the weighted-average interest rate of our borrowings in 2020 compared to 2019.

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

We recorded a share of net losses of associates and joint ventures of ￦3 billion in 2019 compared to a share of net profit of associates and joint ventures of ￦18 billion in 2020. In 2019, our share of net losses of associates and joint ventures consisted primarily of our share of loss from K Bank of ￦29 billion, which was partially offset by our share of profit from Korea Information & Technology Fund of ￦18 billion. In 2020, our share of net profit of associates and joint ventures consisted primarily of our share of profit from various associates, including K-Realty CR-REITs No. 1, of ￦34 billion and Korea Information & Technology Fund of ￦12 billion, which was partially offset by our share of loss from K Bank of ￦30 billion.

Income Tax Expense

Income tax expense decreased by 10.8%, or ￦35 billion, from ￦320 billion in 2019 to ￦285 billion in 2020, while our profit before income tax increased by 1.5%, or ￦16 billion, from ￦1,016 billion in 2019 to ￦1,032 billion in 2020. Our effective tax rate was 31.5% in 2019 and 27.7% in 2020. See Note 29 of the notes to the Consolidated Financial Statements.

Profit for the Year

Due to the factors described above, our profit for the year increased by 7.2%, or ￦50 billion, from ￦696 billion in 2019 to ￦746 billion in 2020. Our net profit margin, which is net profit for the year as a percentage of operating revenue, was 2.8% in 2019 and 3.1% in 2020.

Segment Results—ICT

Our operating revenue for the ICT segment, prior to adjusting for inter-segment transactions, decreased by 1.4%, or ￦252 billion, from ￦18,528 billion in 2019 to ￦18,276 billion in 2020, primarily due to a decrease in revenue from our fixed-line services to individual and household customers and the sale of handsets, the impact of which was partially offset by increases in revenue from media and content services and mobile services, as described above.

Our operating income for the ICT segment, prior to adjusting for inter-segment transactions, increased by 27.7%, or ￦176 billion, from ￦634 billion in 2019 to ￦810 billion in 2020, as the ￦428 billion decrease in the segment’s operating expenses outpaced the ￦252 billion decrease in

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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, increased from 3.4% in 2019 to 4.4% in 2020.

Our depreciation and amortization for the ICT segment, prior to adjusting for inter-segment transactions, increased by 0.1%, or ￦5 billion, from ￦3,229 billion in 2019 to ￦3,234 billion in 2020.

Segment Results—Finance

Our operating revenue for the finance segment, prior to adjusting for inter-segment transactions, decreased by 2.9%, or ￦109 billion, from ￦3,795 billion in 2019 to ￦3,686 billion in 2020, primarily due to decrease in fees from credit card services of BC Card as a result of a reduction in the usage of credit cards during COVID-19 pandemic.

Our operating income for the finance segment, prior to adjusting for inter-segment transactions, decreased by 46.3%, or ￦73 billion, from ￦158 billion in 2019 to ￦85 billion in 2020, as the ￦109 billion decrease in the segment’s operating revenue outpaced the ￦36 billion decrease in operating expenses. For this segment, operating margin decreased from 4.2% in 2019 to 2.3% in 2020.

Depreciation and amortization for the finance segment, prior to adjusting for inter-segment transactions, increased by 90.6%, or ￦25 billion, from ￦28 billion in 2019 to ￦53 billion in 2020.

Segment Results—Satellite TV

Our operating revenue for the satellite TV segment, prior to adjusting for inter-segment transactions, increased by 1.7%, or ￦12 billion, from ￦695 billion in 2019 to ￦707 billion in 2020 primarily due to an increase in operating revenue of KT Skylife.

Our operating income for the satellite TV segment, prior to adjusting for inter-segment transactions, increased by 2.9%, or ￦2 billion, from ￦69 billion in 2019 to ￦71 billion in 2020, as the ￦12 billion increase in the segment’s operating revenue outpaced the ￦10 billion increase in operating expenses. Operating margin for this segment increased from 10.0% in 2019 to 10.1% in 2020.

Depreciation and amortization for the satellite TV segment, prior to adjusting for inter-segment transactions, decreased by 10.6%, or ￦10 billion, from ￦95 billion in 2019 to ￦85 billion in 2020.

Segment Results—Others

Our operating revenue for the others segment, prior to adjusting for inter-segment transactions, increased by 1.7%, or ￦98 billion, from ￦5,846 billion in 2019 to ￦5,944 billion in 2020, primarily due to an increase in revenue from our information and technology and network services.

Our operating income for the others segment, prior to adjusting for inter-segment transactions, decreased by 4.3%, or ￦9 billion, from ￦218 billion in 2019 to ￦209 billion in 2020, as the ￦107 billion increase in the segment’s operating expenses outpaced the ￦98 billion increase in the segment’s operating revenue. Operating margin for this segment decreased from 3.7% in 2019 to 3.5% in 2020.

Depreciation and amortization for this segment, prior to adjusting for inter-segment transactions, decreased by 3.1%, or ￦11 billion, from ￦357 billion in 2019 to ￦346 billion in 2020.

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Operating Results—2018 Compared to 2019

The following table presents selected income statement data and changes therein for 2018 and 2019:

	For the Year Ended December 31,						Changes
							2018 vs. 2019
	2018			2019			Amount			%
	(In billions of Won)
Operating revenue	￦	23,436		￦	24,899		￦	1,463			6.2	%
Operating expenses		22,335			23,872			1,537			6.9
Operating profit		1,101			1,027			(74	)		(6.7	)
Finance income		374			424			50			13.4
Finance costs		436			432			(4	)		(0.8	)
Share of net profits (losses) of associates and joint venture		(5	)		(3	)		2			(39.6	)
Profit before income tax		1,034			1,016			(18	)		(1.7	)
Income tax expense		315			320			5			1.7
Profit for the year	￦	719		￦	696		￦	(24	)		(3.3	)%

Operating Revenue

The following table presents a breakdown of our operating revenue and changes therein for 2018 and 2019:

	For the Year Ended December 31,				Changes
					2018 vs. 2019
Products and services	2018		2019		Amount			%
	(In billions of Won)
Mobile services	￦	6,828	￦	6,795	￦	(33	)		(0.5	)%
Fixed-line services:
Fixed-line and VoIP telephone services		1,708		1,579		(130	)		(7.6	)
Broadband Internet access services		2,113		2,177		65			3.1
Data communication services		1,048		1,111		63			6.0
Sub-total		4,869		4,867		(3	)		(0.1	)
Media and content services		2,262		2,516		254			11.2
Financial services		3,445		3,642		197			5.7
Others		2,743		2,885		142			5.2
Sale of goods (1)		3,289		4,194		905			27.5
Total operating revenue	￦	23,436	￦	24,899	￦	1,463			6.2	%

(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 increased by 6.2%, or ￦1,463 billion, from ￦23,436 billion in 2018 to ￦24,899 billion in 2019, primarily due to increases in revenue from sale of goods and media and content services, the collective impact of which was partially offset by decreases in revenue from fixed-line and VoIP telephone services.

Mobile Services

Our mobile services revenue decreased by 0.5%, or ￦33 billion, from ￦6,828 billion in 2018 to ￦6,795 billion in 2019, primarily due to a decrease in our average revenue per user, which impact was offset by an increase in our mobile subscribers.

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Our average revenue per user decreased from ￦32,021 in 2018 to ￦31,625 in 2019 mainly due to (i) the election by a substantial portion of our renewal as well as new subscribers to receive subscription rate discounts in lieu of handset subsidies, which discounts increased from 20.0% to 25.0% in September 2017, (ii) election of less costly plans for their second devices and (iii) an amendment to our revenue recognition method pursuant to which we no longer recognize operating expenses related to redemption of rewards points and instead deduct such amount from our operating revenue starting in the fourth quarter of 2019, the aggregate impact of which was partially offset by an increase in the subscribers of our 5G services, which entail higher subscription rates compared to our other mobile services.

We recorded a 3.8% increase in our mobile subscribers from approximately 21.1 million as of December 31, 2018 to approximately 21.9 million (including 1.4 million subscribers of 5G services) as of December 31, 2019.

Fixed-line Services

Our fixed-line services revenue decreased by 0.1%, or ￦3 billion, from ￦4,869 billion in 2018 to ￦4,867 billion in 2019, reflecting a decrease in our revenue from fixed-line and VoIP telephone services, which impact was mostly offset by increases in revenue from broadband Internet access services and data communication services.

Fixed-line and VoIP Telephone Services. Our fixed-line and VoIP telephone services revenue decreased by 7.6%, or ￦130 billion, from ￦1,708 billion in 2018 to ￦1,579 billion in 2019, primarily due to decreases in subscribers reflecting continued decrease in demand for such services. Our number of PSTN and VoIP lines in service decreased from 14.9 million as of December 31, 2018 to 14.1 million as of December 31, 2019.

Broadband Internet Access Services. Our broadband Internet access services revenue increased by 3.1%, or ￦65 billion, from ￦2,113 billion in 2018 to ￦2,177 billion in 2019, primarily as a result of an increase in the number of subscribers to our premium services. The number of our KT GiGA Internet service subscribers increased from approximately 4.9 million as of December 31, 2018 to approximately 5.5 million as of December 31, 2019.

Data Communication Services. Our data communication services revenue increased by 6.0%, or ￦63 billion, from ￦1,048 billion in 2018 to ￦1,111 billion in 2019 primarily due to an increase in revenue from our co-location and server leasing services offered to corporate customers.

Media and Content Services

Our media and content services revenue increased by 11.2%, or ￦254 billion, from ￦2,262 billion in 2018 to ￦2,516 billion in 2019, primarily due to an increase in the number of IPTV subscribers from approximately 7.9 million as of December 31, 2018 to approximately 8.4 million as of December 31, 2019, as well as increases in revenues of Genie Music Corporation and KTH.

Financial Services

Financial services revenue increased by 5.7%, or ￦197 billion, from ￦3,445 billion in 2018 to ￦3,642 billion in 2019, primarily due to an increase in commission revenue from BC Card reflecting an expansion of its merchant payment network.

Others

Other operating revenue increased by 5.2%, or ￦142 billion, from ￦2,743 billion in 2018 to ￦2,885 billion in 2019, primarily due to increases in revenue from our information technology and network services, particularly from systems integration services and operation of Internet data centers.

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Sale of Goods

Revenue from sale of goods increased by 27.5%, or ￦905 billion, from ￦3,289 billion in 2018 to ￦4,194 billion in 2019, primarily due to an increase in revenue from sales of mobile handsets in 2019 compared to 2018. The sale of mobile handsets in 2019 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 2018 and 2019:

	For the Year Ended December 31,					Changes
						2018 vs. 2019
	2018			2019		Amount			%
	(In billions of Won)
Salaries and wages	￦	3,846		￦	3,974	￦	128			3.3	%
Depreciation		2,674			2,530		(144	)		(5.4	)
Depreciation of right-of-use assets		—			443		443			N.A.
Amortization of intangible assets		608			657		49			8.1
Commissions		1,080			1,115		35			3.3
Interconnection charges		580			534		(46	)		(7.9	)
International interconnection fee		227			240		14			6.0
Purchase of inventories		4,414			4,454		40			0.9
Changes of inventories		(433	)		283		716			N.A.
Sales commission		1,943			2,316		373			19.2
Service cost		1,541			1,610		69			4.5
Utilities		323			333		9			2.9
Taxes and dues		285			278		(7	)		(2.6	)
Rental expenses		460			193		(267	)		(58.0	)
Insurance premium		74			82		9			11.9
Installation fee		144			155		12			8.0
Advertising expenses		158			150		(8	)		(4.8	)
Research and development expenses		177			165		(12	)		(6.6	)
Card service costs		3,113			3,067		(46	)		(1.5	)
Others		1,123			1,293		170			15.1
Total operating expenses	￦	22,335		￦	23,872	￦	1,537			6.9	%

N.A. means not applicable.

Total operating expenses increased by 6.9%, or ￦1,537 billion, from ￦22,335 billion in 2018 to ￦23,872 billion in 2019 primarily due to impact from changes of inventories, recognition of depreciation of right-of-use assets starting in 2019, and increases in sales commissions and salaries and wages, the collective impact of which was partially offset by decreases in rental expenses and depreciation. Specifically:

• 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, amounted to ￦(433) billion in 2018 and ￦283 billion in 2019, which indicates that inventories increased by ￦433 billion in 2018 while they decreased by ￦283 billion in 2019.

• We recorded depreciation of right-of-use assets of ￦443 billion in 2019 compared to no such expenses in 2018 due to our adoption of IFRS 16 starting on January 1, 2019 and related recognition of right-of-use assets of ￦900 billion on such date, which amount was

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further increased by ￦128 billion in connection with our adoption of change in accounting policy relating to the determination of lease term. See Note 41 of the notes to the Consolidated Financial Statements. Right-of-use assets are depreciated over the shorter of the assets’ useful life and the lease term on a straight-line basis. See “Item 5. Operating and Financial Review and Prospects—Item 5.A. Operating Results—Changes in Accounting Policies—Adoption of IFRS 16” and Note 41 of the notes to the Consolidated Financial Statements.

• Sales commission increased by 19.2%, or ￦373 billion, from ￦1,943 billion in 2018 to ￦2,316 billion in 2019 primarily due to an increase in sales commissions that we paid to third party dealers for procurement of 5G mobile subscribers launched in April 2019.

• Salaries and wages increased by 3.3%, or ￦128 billion, from ￦3,846 billion in 2018 to ￦3,974 billion in 2019 primarily due to an increase in wages as well as the consolidation of salary expenses of certain subsidiaries in which we acquired a controlling interest in the fourth quarter of 2018.

These factors were partially offset by the following:

• Our rental expenses decreased by 58.0%, or ￦267 billion, from ￦460 billion in 2018 to ￦193 billion in 2019 primarily due to our adoption of IFRS 16 starting on January 1, 2019. Pursuant to our adoption of IFRS 16, we began to recognize lease liabilities in relation to leases that had previously been classified as “operating leases,” which in turn reduced our rental expenses in 2019.

• Depreciation decreased by 5.4%, or ￦144 billion, from ￦2,674 billion in 2018 to ￦2,530 billion in 2019 primarily due to completion of depreciation of certain assets related to our LTE services as well as a decrease in property and equipment of ￦210 billion upon our adoption of IFRS 16 starting on January 1, 2019.

Operating Profit

Due to the factors described above, our operating profit decreased by 6.7%, or ￦74 billion, from ￦1,101 billion in 2018 to ￦1,027 billion in 2019. Our operating margin, which is operating profit as a percentage of operating revenue, was 4.7% in 2018 and 4.1% in 2019.

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Finance Income (Costs)

The following table presents a breakdown of our finance income and costs and changes therein for 2018 and 2019:

	For the Year Ended December 31,				Changes
					2018 vs. 2019
	2018		2019		Amount			%
	(In billions of Won)
Interest income	￦	245	￦	283	￦	38			15.5	%
Gain on foreign currency transactions		17		25		7			43.2
Gain on foreign currency translation		4		18		14			387.1
Gain on settlement of derivatives		28		9		(19	)		(67.7	)
Gain on valuation of derivatives		66		77		11			16.7
Others		14		13		(2	)		(11.0	)
Total finance income	￦	374	￦	424	￦	50			13.4	%
Interest expenses	￦	297	￦	278	￦	(18	)		(6.2	)%
Loss on foreign currency transactions		49		30		(19	)		(38.4	)
Loss on foreign currency translation		73		94		21			29.4
Loss on settlement of derivatives		—		0		0			N.A.
Loss on valuation of derivatives		2		16		14			675.9
Loss on disposal of trade receivables		14		11		(3	)		(18.2	)
Others		1		2		1			102.4
Total finance costs	￦	436	￦	432	￦	(4	)		(0.8	)%

N.A. means not applicable.

Our interest income increased by 15.5%, or ￦38 billion, from ￦245 billion in 2018 to ￦283 billion in 2019 primarily due to an increase in interest income related to our device installment plans.

Our interest expenses decreased by 6.2%, or ￦18 billion, from ￦297 billion in 2018 to ￦278 billion in 2019 primarily due to a general decrease in weighted-average interest rates of our borrowings in 2019 compared to 2018.

Our net loss on foreign currency transactions decreased by 82.3%, or ￦26 billion, from ￦32 billion in 2018 to ￦6 billion in 2019, and our net loss on foreign currency translation increased by 10.2%, or ￦7 billion, from ￦69 billion in 2018 to ￦76 billion in 2019, as the Won depreciated against the Dollar in 2018 as well as in 2019. In terms of the market average exchange rates announced by Seoul Money Brokerage Services, Ltd., the Won depreciated from ￦1,071.4 to US$1.00 as of December 31, 2017 to ￦1,118.1 to US$1.00 as of December 31, 2018 and decreased further to ￦1,157.8 to US$1.00 as of December 31, 2019. Against such depreciations, our net gain on transactions of derivatives decreased by 67.8%, or ￦19 billion, from ￦28 billion in 2018 to ￦9 billion in 2019 and our net gain on valuation of derivatives decreased by 4.3%, or ￦3 billion, from ￦64 billion in 2018 to ￦61 billion in 2019.

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

Our share of net losses of associates and joint ventures decreased by 39.6%, or ￦2 billion, from ￦5 billion in 2018 to ￦3 billion in 2019. In 2018, our share of net losses of associates and joint ventures consisted primarily of our share of loss from K Bank of ￦20 billion, which was partially offset

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by our share of profit from Korea Information & Technology Fund of ￦15 billion. In 2019, our share of net losses of associates and joint ventures consisted primarily of our share of loss from K Bank of ￦29 billion, which was partially offset by our share of profit from Korea Information & Technology Fund of ￦18 billion.

Income Tax Expense

Income tax expense increased by 1.7%, or ￦5 billion, from ￦315 billion in 2018 to ￦320 billion in 2019, while our profit before income tax decreased by 1.7%, or ￦18 billion, from ￦1,034 billion in 2018 to ￦1,016 billion in 2019. Our effective tax rate was 30.4% in 2018 and 31.5% in 2019. See Note 29 of the notes to the Consolidated Financial Statements.

Profit for the Year

Due to the factors described above, our profit for the year decreased by 3.3%, or ￦24 billion, from ￦719 billion in 2018 to ￦696 billion in 2019. Our net profit margin, which is net profit for the year as a percentage of operating revenue, was 3.1% in 2018 and 2.8% in 2019.

Segment Results—ICT

Our operating revenue for the ICT segment, prior to adjusting for inter-segment transactions, increased by 4.5%, or ￦803 billion, from ￦17,724 billion in 2018 to ￦18,528 billion in 2019, primarily due to increases in revenue from our information technology and network services and media and content services, the collective impact of which was partially offset by a decrease in revenue from our fixed-line services to individual and household customers, as described above.

Our operating income for the ICT segment, prior to adjusting for inter-segment transactions, decreased by 32.1%, or ￦299 billion, from ￦933 billion in 2018 to ￦634 billion in 2019, as the ￦1,102 billion increase in the segment’s operating expenses outpaced the ￦803 billion increase in 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 5.3% in 2018 to 3.4% in 2019.

Our depreciation and amortization for the ICT segment, prior to adjusting for inter-segment transactions, increased by 10.7%, or ￦312 billion, from ￦2,917 billion in 2018 to ￦3,229 billion in 2019.

Segment Results—Finance

Our operating revenue for the finance segment, prior to adjusting for inter-segment transactions, increased by 0.6%, or ￦24 billion, from ￦3,772 billion in 2018 to ￦3,795 billion in 2019.

Our operating income for the finance segment, prior to adjusting for inter-segment transactions, increased by 6.6%, or ￦10 billion, from ￦148 billion in 2018 to ￦158 billion in 2019, as the ￦24 billion increase in the segment’s operating revenue outpaced the ￦14 billion increase in the segment’s operating expenses. For this segment, operating margin increased from 3.9% in 2018 to 4.2% in 2019.

Depreciation and amortization for the finance segment, prior to adjusting for inter-segment transactions, increased by 23.3%, or ￦5 billion, from ￦23 billion in 2018 to ￦28 billion in 2019.

Segment Results—Satellite TV

Our operating revenue for the satellite TV segment, prior to adjusting for inter-segment transactions, increased by 0.6%, or ￦4 billion, from ￦691 billion in 2018 to ￦695 billion in 2019.

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Our operating income for the satellite TV segment, prior to adjusting for inter-segment transactions, increased by 3.9%, or ￦3 billion, from ￦67 billion in 2018 to ￦69 billion in 2019, as the ￦4 billion increase in the segment’s operating revenue outpaced the ￦1 billion increase in operating expenses. Operating margin for this segment increased from 9.7% in 2018 to 10.0% in 2019.

Depreciation and amortization for the satellite TV segment, prior to adjusting for inter-segment transactions, decreased by 3.4%, or ￦3 billion, from ￦98 billion in 2018 to ￦95 billion in 2019.

Segment Results—Others

Our operating revenue for the others segment, prior to adjusting for inter-segment transactions, increased by 13.3%, or ￦687 billion, from ￦5,159 billion in 2018 to ￦5,846 billion in 2019, primarily due to increases in revenue from our information and technology and network services.

Our operating income for the others segment, prior to adjusting for inter-segment transactions, increased by 309.6%, or ￦165 billion, from ￦53 billion in 2018 to ￦218 billion in 2019, as the ￦687 billion increase in the segment’s operating revenue outpaced the ￦521 billion increase in operating expenses. Operating margin for this segment increased from 1.0% in 2018 to 3.7% in 2019.

Depreciation and amortization for this segment, prior to adjusting for inter-segment transactions, increased by 50.9%, or ￦121 billion, from ￦237 billion in 2018 to ￦357 billion in 2019.

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,
	2018			2019			2020
	(In billions of Won)
Net cash inflow from operating activities	￦	4,010		￦	3,745		￦	4,740
Net cash outflow from investing activities		(2,704	)		(3,887	)		(3,761	)
Net cash outflow from financing activities		(532	)		(250	)		(648	)
Cash and cash equivalents at beginning of the year		1,928			2,703			2,306
Cash and cash equivalents at end of the year		2,703			2,306			2,635
Net increase (decrease) in cash and cash equivalents		775			(398	)		329

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 ￦2,261 billion in 2018, ￦3,263 billion in 2019 and ￦3,208 billion in 2020 for the acquisition of property and equipment and investment properties. In our financing activities, we used cash of ￦1,613 billion in 2018, ￦1,377 billion in 2019 and ￦1,627 billion in 2020 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 ￦299 billion in 2018, ￦305 billion in 2019 and ￦311 billion in 2020.

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

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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 expand our 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 of the notes to the Consolidated Financial Statements for a disclosure of the guarantees provided.

The following table sets forth selected information regarding our contractual obligations to make future payments as of December 31, 2020:

	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)	￦	7,243	￦	1,323	￦	2,416	￦	1,599	￦	1,905
Lease obligations (including any interests)		1,185		336		406		253		191
Severance payment obligations (2)		5,273		236		574		620		3,844
Asset retirement obligations		116		24		45		41		6
Long-term accounts payable—others		2,162		582		616		546		418
Total		15,979		2,500		4,057		3,058		6,364
Estimate of interest payment based on contractual interest rates effective as of December 31, 2020	￦	883	￦	156	￦	223	￦	149	￦	356

(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, 2020.

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 ￦719 billion in 2018, ￦696 billion in 2019 and ￦746 billion in 2020 as discussed in “Item 5.A. Operating Results.” Non-cash expense adjustments in our statement of cash flows from depreciation, amortization of intangible assets and depreciation of right-of-use assets amounted to ￦3,365 billion in 2018, ￦3,671 billion in 2019 and ￦3,668 billion in 2020, 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 ￦1,473 billion in 2018, ￦1,952 billion in 2019 and ￦1,795 billion in 2020.

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.

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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 of the notes 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$200 million of LIBOR(3M)+0.450% notes due 2020 in August 2018, (ii) US$100 million of LIBOR(3M)+0.900% notes due 2023 in August 2018, (iii) Japanese Yen 30 billion of 0.300% notes due 2020 in November 2018, (iv) US$ 350 million of LIBOR(3M)+0.980% notes due 2024 in November 2019, (v) Japanese Yen 29.6 billion of 0.220% notes due 2022 in July 2019, (vi) Japanese Yen 0.4 billion of 0.330% notes due 2024 in July 2019, (vii) Singapore dollar 0.3 billion of SOR(6M)+0.500% notes due 2023 in June 2020 and (viii) US$400 million of 1.000% notes due 2025 in September 2020. See Note 16 of the notes 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 ￦14,658 billion as of December 31, 2018, ￦15,141 billion as of December 31, 2019 and ￦15,551 billion as of December 31, 2020.

Liquidity

We had a working capital (current assets minus current liabilities) surplus of ￦2,764 billion as of December 31, 2018, ￦1,828 billion as of December 31, 2019 and ￦1,962 billion as of December 31, 2020.

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

	As of December 31,
	2018		2019		2020
	(In billions of Won)
Cash and cash equivalents	￦	2,703	￦	2,306	￦	2,635
Trade and other receivables, net		5,680		5,859		4,902
Inventories, net		1,075		792		535
Other financial assets		995		868		1,203

Our cash and cash equivalents (substantially all of which are in Won) totaled ￦2,703 billion as of December 31, 2018, ￦2,306 billion as of December 31, 2019 and ￦2,635 billion as of December 31, 2020. 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.

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

	As of December 31,
	2018		2019		2020
	(In billions of Won)
Trade and other payables	￦	6,948	￦	7,597	￦	6,210
Borrowings		1,368		1,186		1,418

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, 2020, we entered into various commitments with financial institutions totaling ￦2,560 billion and US$281 million, of which ￦203 billion and US$93 million was used. See Note 20 of the notes to the Consolidated Financial Statements. Of the ￦7,316 billion total book value of debentures and borrowings outstanding as of December 31, 2020, ￦2,741 billion was denominated in foreign currencies. See Note 16 of the notes to the 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 ￦2,261 billion in 2018, ￦3,263 billion in 2019 and ￦3,208 billion in 2020 on a consolidated basis for the acquisition of property and equipment and investment property. We currently expect our capital expenditures for the acquisition of property and equipment and investment property in 2021 to be comparable to those in 2020 on a standalone basis. However, the actual amount remains 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 1.5% in 2018, 0.4% in 2019 and 0.5% in 2020. 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;

• an artificial intelligence R&D laboratory; and

• a platform R&D laboratory.

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As of December 31, 2020, KT Corporation had 4,341 domestic and 1,487 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 ￦273 billion in 2018, ￦254 billion in 2019 and ￦230 billion in 2020.

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.

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 inside directors, including the Representative Director; 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. Under our articles of incorporation, the term of office for an inside director is up to three years. Pursuant to an amendment to our articles of incorporation in March 2020, the term of office for an outside director changed from up to ten years to up to six years, which change was made to reflect an amendment to the enforcement decree of the Commercial Code of Korea. The terms for both an inside director and an outside director are, however, 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

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the total members of the outside director candidate nominating committee. According to our articles of incorporation, such committee must consist of one inside 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.

Our current directors are as follows:

Name	Position	Director Since		Date of Birth	Expiration of Term of Office
Inside Directors (1)
Hyeon-Mo Ku	Representative Director and Chief Executive Officer		March 2020	January 13, 1964		2023
Jong-Ook Park	President, Head of Corporate Planning Group		March 2020	January 24, 1962		2022
Kook-Hyun Kang	President, Head of Customer Business Group		March 2021	September 8, 1963		2022
Outside Directors (1)
Dae-You Kim	Outside Director, DB Life Insurance Co., Ltd.		March 2018	July 21, 1951		2024
Gang-Cheol Lee	Outside Director, Paju Country Club Co., Ltd.		March 2018	May 6, 1947		2024
Hee-Yol Yu	Board Chairperson, Korea Carbon Capture and Sequestration R&D Center		March 2019	January 12, 1947		2022
Tae-Yoon Sung	Professor, School of Economics, Yonsei University		March 2019	February 13, 1970		2022
Hyun-Myung Pyo	Outside Director, Hankook Tire & Technology Co.,Ltd.		March 2020	October 21, 1958		2023
Chung-Gu Kang	Professor, School of Electrical Engineering, Korea University		March 2020	December 12, 1962		2023
Chan-Hi Park	Professor, School of Business, Chung-Ang University		March 2020	December 2, 1964		2022
Eun-Jung Yeo	Professor, School of Business, Chung-Ang University		March 2020	February 15, 1973		2023

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

Our “Representative Director” is authorized to perform all judicial and extra-judicial acts relating to our business. Our shareholders elect the Representative Director in accordance with the provisions of the Commercial Code and our articles of incorporation. In March 2018, we amended our articles of incorporation in efforts to add more rigor and transparency to the process of selecting our Representative Director. Our Corporate Governance Committee conducts investigation and composition of a pool of candidates and selects the representative director candidates whose candidacy will be further examined. Subsequently, the Representative Director Candidate Examination Committee examines and selects Representative Director candidates and submits an examination report of such candidates to our board of directors. A Representative Director candidate recommended by our board of directors is nominated at the shareholders’ meeting.

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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 Representative Director. In such case, the chairperson of the board of directors, on our behalf, signs the management contract. In March 2020, our articles of incorporation were amended to have management goals be set based on objectives that can be accomplished during a Representative Director’s term in office.

The board of directors may conduct performance review discussions to determine if the new Representative Director 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 Representative Director has failed to achieve the management goals, it may propose to dismiss Representative Director at a shareholders’ meeting.

Senior Management

In addition to our inside directors who are also our executive officers, we have the following executive officers as of April 30, 2021:

Name	Title and Responsibilities	Year of Birth
Hyoung-Wook Kim	Senior Executive Vice President, Future Value Office		1963
Byung-Sam Park	Senior Executive Vice President, Ethics Office		1966
Jae-Ho Song	Senior Executive Vice President, AI/DX Convergence Business Group		1966
Soo-Jung Shin	Senior Executive Vice President, Enterprise Business Group		1965
Hyun-Yok Sheen	Senior Executive Vice President, Corporate Management Group		1968
Sang-Don Ahn	Senior Executive Vice President, Legal Affairs Office		1962
Cheol-Gyu Lee	Senior Executive Vice President, Network Group		1960
Bong-Gyun Kim	Executive Vice President, Enterprise Business Strategy Unit		1972
Young-Jin Kim	Executive Vice President, Financial Management Office		1967
June-Keun Kim	Executive Vice President, C-level Consulting Unit		1966
Hoon-Bae Kim	Executive Vice President, Media Business Unit		1963
Hyun-Jin Park	Executive Vice President, Customer Value Management Unit		1968
Chang-Seok Seo	Executive Vice President, Jeonnam/Jeonbuk Regional Headquarter		1967
Chi-Yong Ahn	Executive Vice President, Northern Seoul/Gangwon Regional Headquarter		1966
Yul-Mo Yang	Executive Vice President, Public Relations Office		1967
Dong-Sik Yun	Executive Vice President, IT Planning Office		1963
Seung-Yong Lee	Executive Vice President, Policy Cooperation Office		1964
Jin-Woo Lee	Executive Vice President, Busan/Gyeongnam Regional Headquarter		1966
Hyeon-Seuk Lee	Executive Vice President, Chungnam/Chungbuk Regional Headquarter		1966
Jong-Taek Lim	Executive Vice President, External Cooperation Office		1964
Sang-Kwi Chang	Executive Vice President, Legal Affairs Department 1		1968
Jung-Soo Jung	Executive Vice President, Southern Seoul/Western Seoul Regional Headquarter		1966
Jung-Yong Ji	Executive Vice President, Network O&M Unit		1968
Gyung-Pyo Hong	Executive Vice President, Institute of Convergence Technology		1962
Gang-Bon Koo	Senior Vice President, Metropolitan Wholesale Unit		1972
Hye-Jin Kwon	Senior Vice President, Network Strategy Department		1971
Moo-Seong Kim	Senior Vice President, Management Support Office		1972
Byung-Kyun Kim	Senior Vice President, Device Business Unit		1968
Bong-Ki Kim	Senior Vice President, Platform Laboratory		1968
Sang-Kyoon Kim	Senior Vice President, Group Human Resources Office		1970
Seong-ll Kim	Senior Vice President, Chungnam/Chungbuk Network O&M Headquarter		1966
Seung-Woon Kim	Senior Vice President, Infra Service Unit		1968
Young-Woo Kim	Senior Vice President, Group Management Office		1967
Young-In Kim	Senior Vice President, Network Strategy Unit		1968
Yi-Han Kim	Senior Vice President, Enterprise Business Consulting & Implementation Unit 1		1966

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Name	Title and Responsibilities	Year of Birth
Jae-Kwon Kim	Senior Vice President, Biz Customer Business Unit		1968
Jun-Su Kim	Senior Vice President, Busan/Gyeongnam Network O&M Headquarter		1970
Jun-Ho Kim	Senior Vice President, Public/Finance Customer Business Unit		1965
Chae-Hee Kim	Senior Vice President, Strategy & Planning Office		1974
Pyeong Ryu	Senior Vice President, Jeonnam/Jeonbuk Enterprise Customer Sales Headquarter		1966
Sung-Uk Moon	Senior Vice President, Global Business Unit		1972
Young-Il Moon	Senior Vice President, Data & Information Security Unit		1966
Hye-Byung Min	Senior Vice President, Enterprise Service DX Unit		1969
Song-Yul Park	Senior Vice President, Jeonnam/Jeonbuk Customer Sales Headquarter Sales Planning Department		1969
Yong-Man Park	Senior Vice President, Jeonnam/Jeonbuk Customer Sales Headquarter		1965
Jeong-Jun Park	Senior Vice President, Enterprise Customer Business Unit		1967
Jong-Ho Park	Senior Vice President, Network Control Unit		1964
Hyo-Il Park	Senior Vice President, Customer Experience Innovation Unit		1970
Soon-Min Bae	Senior Vice President, AI2XL Laboratory		1980
Seung-Yun Paik	Senior Vice President, Strategic Investment P-TF		1970
Young-Soo Seo	Senior Vice President, Network Research Technology Support Unit		1968
Jeong-Hyun Seo	Senior Vice President, Legal Affairs Department 3		1971
Eun-Kwon Suk	Senior Vice President, Daegu/Gyeongbuk Enterprise Customer Sales Headquarter		1968
Keum-Seok Shin	Senior Vice President, SCM Strategy Office		1965
Hoon-Joo Shin	Senior Vice President, Corporate Image Strategy P-TF		1971
Chang-Yong Ahn	Senior Vice President, Daegu/Gyeongbuk Regional Headquarter		1966
Jin-Ho Yang	Senior Vice President, Legal Affairs Department 2		1973
Jae-Min Eom	Senior Vice President, Busan/Gyeongnam Customer Sales Headquarter		1965
Hun-Yong Oh	Senior Vice President, Enterprise Business Consulting & Implementation Unit 2		1966
Kyung-Hwa Ok	Senior Vice President, IT Strategy Unit		1968
Heung-Jae Won	Senior Vice President, Western Seoul Customer Sales Headquarter		1967
Yong-Kyu Yoo	Senior Vice President, Southern Seoul/Western Seoul Enterprise Customer Sales Headquarter		1971
Chang-Kyu Yoo	Senior Vice President, Northern Seoul/Gangwon Enterprise Customer Sales Headquarter		1966
Mi-Hee Lee	Senior Vice President, Cloud/DX Business Unit		1970
Sang-Il Lee	Senior Vice President, Northern Seoul/Gangwon Network O&M Headquarter		1964
Sun-Joo Lee	Senior Vice President, ESG Management & Implementation Office		1969
Yong-Gyoo Lee	Senior Vice President, Southern Seoul/Western Seoul Network O&M Headquarter		1965
Jong-Sik Lee	Senior Vice President, Infra Laboratory		1972
Chang-Ho Yi	Senior Vice President, CEO Office		1972
Seung-Hyouk Yim	Senior Vice President, CEO Office team 2		1970
Jang-Mi Lim	Senior Vice President, Industry Biz 2 P-TF		1966
Chae-Hwan Im	Senior Vice President, AI/DX Platform Business Unit		1969
In-Yong Jeong	Senior Vice President, On External Training		1969
Jae-Wook Jeong	Senior Vice President, CEO Office team 1		1972
Seong-Eun Cho	Senior Vice President, S/W Development Unit		1971
Yi-Joon Jo	Senior Vice President, Financial Management Planning Department		1967
Young-Sim Jin	Senior Vice President, Group HR Development Academy		1972
Kang-Rim Choi	Senior Vice President, Connected Car Biz Center		1974
Sung-Wook Choi	Senior Vice President, Daegu/Gyeongbuk Customer Sales Headquarter		1965
Si-Hwan Choi	Senior Vice President, Eastern Seoul Customer Sales Headquarter		1967
Joon-Ki Choi	Senior Vice President, AI/BigData Business Unit		1974
Chan-Ki Choi	Senior Vice President, Sales Operating Business Unit		1966
Ja-Kyung Hahn	Senior Vice President, Industry AI Core TF		1971
Suk-Zoon Huh	Senior Vice President, Institute of Economic & Business Research		1967
Kye-Sung Hong	Senior Vice President, Chungnam/Chungbuk Enterprise Customer Sales Headquarter		1968
Sung-Pil Hong	Senior Vice President, Group Real Estate Department		1965
Tae-Hyun Hwang	Senior Vice President, AI/DX Convergence Strategy Department		1971

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Item 6.B.  Compensation

Compensation of Directors and Executive Officers

In 2020, the aggregate compensation paid and accrued to all directors and executive officers was approximately ￦44 billion and the aggregate amount set aside or accrued by us to provide pension and retirement benefits to such persons was ￦7.5 billion.

The compensation of our five most compensated directors and executive officers who received total annual compensation exceeding ￦500 million in 2020 was as follows:

Name	Position	Total Compensation in 2020	Composition of Total Compensation
		(In millions of Won)
Chang-Gyu Hwang	Former Chief Executive Officer	￦2,251	￦142 (salary); ￦629 (bonus); ￦6 (benefits); ￦1,474 (severance pay)
Dong-Myun Lee	Former President	￦2,037	￦53 (salary); ￦469 (bonus); ￦7 (benefits); ￦1,508 (severance pay)
In-Hoe Kim	Former President	￦1,111	￦80 (salary); ￦402 (bonus); ￦7 (benefits); ￦622 (severance pay)
Hyeon-Mo Ku	Chief Executive Officer	￦997	￦527 (salary); ￦458 (bonus); ￦12 (benefits)
Yoon-Young Park	Former President	￦816	￦433 (salary); ￦364 (bonus); ￦19 (benefits)

The chairperson of our board of directors enters into an employment agreement on our behalf with our Representative Director. The employment agreement sets certain management targets to be achieved by the Representative Director 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 Representative Director’s employment, including proposing at the shareholders’ meeting an early termination of his employment. 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 Representative Director 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, 2021, none of our inside 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 inside director, Gang-Cheol Lee, Dae-You Kim, Hee-Yol Yu, Hyun-Myung Pyo and Jong-Ook Park. The chairperson is Gang-Cheol Lee. 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

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investigation and composition of a pool of internal and external Representative Director candidates and selection of the Representative Director candidates, who shall be further examined by the Representative Director 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.

Representative Director Candidate Examination Committee

The Representative Director Candidate Examination Committee is comprised of one inside director and all of our outside directors. No member of this committee shall become a candidate for the position of the Representative Director during his or her term as a member of the committee. The committee’s duties include examining the Representative Director candidates selected under the examination criteria determined by our board of directors, selecting the Representative Director 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 inside 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 cannot 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, Tae-Yoon Sung, Hee-Yol Yu, Hyun-Myung Pyo and Chan-Hi Park. The chairperson is Tae-Yoon Sung. The committee’s duties include prior review of the Representative Director’s management goals, terms and conditions proposed for inclusion in the management contract of the Representative Director, including, but not limited to, determining whether the Representative Director has achieved the management goals, and the determination of compensation for the Representative Director and the inside 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.

Management Committee

The Management Committee is currently comprised of Hyeon-Mo Ku, Jong-Ook Park and Kook-Hyun Kang. The chairperson is Hyeon-Mo Ku. 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, not including any sale for stocks with market value of ￦10 billion or more that involves a change of control, 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, Hee-Yol Yu, Chung-Gu Kang, Chan-Hi Park and Eun-Jung Yeo. The chairperson is Chan-Hi Park. This

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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 inside director, Hyun-Myung Pyo, Gang-Cheol Lee, Tae-Yoon Sung, Chan-Hi Park and Kook-Hyun Kang. The chairperson is Hyun-Myung Pyo. 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. 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 Tae-Yoon Sung, Dae-You Kim, Eun-Jung Yeo and Chung-Gu Kang. The chairperson is Dae-You Kim and the financial expert is Eun-Jung Yeo. 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 an independent registered public accounting firm;

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

• evaluating performance of the independent registered public accounting firm;

• approving services to be provided by the independent registered public accounting firm;

• reviewing annual financial statements;

• 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 22,720 employees as of December 31, 2020, compared to 23,372 employees as of December 31, 2019 and 23,835 employees as of December 31, 2018.

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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, 2020, about 77.9% 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 June 16, 2021. 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 expires in December 31, 2021.

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 0.45% of our issued shares as of December 31, 2020.

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 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 ￦440 billion as of December 31, 2020. 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.”

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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 66 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, 368,556 ordinary shares as of April 20, 2021. The table below shows the ownership of our ordinary shares by our directors and executive officers:

Shareholders	Number of Ordinary Shares Owned
Hyeon-Mo Ku		23,563
Jong-Ook Park		11,187
Kook-Hyun Kang		9,776
Dae-You Kim		943
Gang-Cheol Lee		943
Hee-Yol Yu		472
Tae-Yoon Sung		472
Chung-Gu Kang		10,684
Hyoung-Wook Kim		7,623
Byung-Sam Park		8,859
Jae-Ho Song		9,359
Soo-Jung Shin		7,708
Hyun-Yok Sheen		8,421
Sang-Don Ahn		1,800
Cheol-Gyu Lee		9,046
Bong-Gyun Kim		4,524
Young-Jin Kim		6,021
June-Keun Kim		6,936
Hoon-Bae Kim		3,575
Hyun-Jin Park		4,081
Chang-Seok Seo		10,779
Chi-Yong Ahn		6,749
Yul-Mo Yang		4,580
Dong-Sik Yun		3,322
Seung-Yong Lee		6,564
Jin-Woo Lee		2,822
Hyeon-Seuk Lee		6,304
Jong-Taek Lim		4,324
Sang-Kwi Chang		7,246
Jung-Soo Jung		3,173
Jung-Yong Ji		7,052
Gyung-Pyo Hong		6,934
Gang-Bon Koo		2,116
Hye-Jin Kwon		1,392
Moo-Seong Kim		2,096
Byung-Kyun Kim		2,270
Bong-Ki Kim		2,502
Sang-Kyoon Kim		1,000

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Shareholders	Number of Ordinary Shares Owned
Seong-ll Kim		1,110
Seung-Woon Kim		1,036
Young-Woo Kim		3,540
Young-In Kim		2,689
Yi-Han Kim		3,870
Jae-Kwon Kim		2,036
Jun-Su Kim		5,230
Jun-Ho Kim		1,657
Chae-Hee Kim		2,970
Pyeong Ryu		9,616
Sung-Uk Moon		2,675
Young-Il Moon		3,473
Hye-Byung Min		3,322
Song-Yul Park		1,081
Yong-Man Park		3,103
Jeong-Jun Park		2,575
Jong-Ho Park		2,207
Hyo-Il Park		3,958
Soon-Min Bae		4,324
Seung-Yun Paik		2,079
Young-Soo Seo		4,548
Eun-Kwon Suk		1,059
Keum-Seok Shin		3,802
Hoon-Joo Shin		1,047
Chang-Yong Ahn		3,922
Jin-Ho Yang		2,187
Jae-Min Eom		967
Hun-Yong Oh		4,853
Kyung-Hwa Ok		4,249
Heung-Jae Won		4,494
Yong-Kyu Yoo		3,102
Chang-Kyu Yoo		4,102
Mi-Hee Lee		2,805
Sang-Il Lee		1,913
Sun-Joo Lee		3,876
Yong-Gyoo Lee		3,984
Jong-Sik Lee		1,656
Chang-Ho Yi		2,975
Seung-Hyouk Yim		2,631
Jang-Mi Lim		1,151
Chae-Hwan Im		1,036
In-Yong Jeong		1,100
Jae-Wook Jeong		3,482
Seong-Eun Cho		1,567
Yi-Joon Jo		1,000
Young-Sim Jin		595
Kang-Rim Choi		2,103
Sung-Wook Choi		2,150
Si-Hwan Choi		1,002
Joon-Ki Choi		1,101
Chan-Ki Choi		6,576
Ja-Kyung Hahn		1,299
Suk-Zoon Huh		1,590
Kye-Sung Hong		1,946
Sung-Pil Hong		2,036
Tae-Hyun Hwang		881
Total		368,556

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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, 2020:

Shareholders	Number of Shares		Percent of Total Shares Issued
National Pension Corporation		30,498,743		11.68	%
NTTDoCoMo, Inc.		14,257,813		5.46	%
Silchester International Investors LLP		13,588,760		5.20	%
Employee stock ownership association		1,163,339		0.45	%
Directors as a group		58,040		0.02	%
Public		182,275,435		69.81	%
KT Corporation (held in the form of treasury stock)		19,269,678		7.38	%
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 of the notes 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-109.

Legal Proceedings

In February 2018 and April 2019, the KCC imposed a combined fine of approximately ￦50.6 billion and ￦ 2.9 billion, respectively, on SK Telecom, LG U+ and us (our fine being approximately ￦12.5 billion and ￦0.9 billion, respectively) for violation of regulations relating to handset sales in case of wholesale, online sale, etc. In September 2020, the KCC imposed a combined fine of approximately ￦0.9 billion on SK Telecom, SK Broadband, LG U+ and us (our fine being approximately ￦0.3 billion) for violation of regulations relating to bundled plans.

In 2010, 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 penalty surcharge of approximately ￦2 billion on us, finding that we cancelled our contract with

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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, which amount was subsequently increased by Enspert to ￦141 billion in July 2019. In February 2020, the Seoul Central Court ruled in favor of Enspert, entitling it to recovery of damages of approximately ￦6.7 billion. Both parties filed an appeal with the Seoul High Court, where the case is currently pending, 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 penalty surcharge of ￦5.7 billion on us and filed a criminal complaint against us, which is currently under investigation by the Seoul Central District Prosecutor’s Office. In addition, we were restricted for a six month period from January 2020 until July 2020 from bidding on projects by public institutions, including The Public Procurement Service and the Korea Racing Authority. Furthermore, the Government has filed against us, LG U+, SK Broadband and Sejong Telecom (i) a claim for damages of ￦1 billion in April 2020 for collusion in a bidding held by the MSIT and (ii) a claim for damages of ￦1 billion in August 2020 for collusion in a bidding held for the engagement of telecommunications companies to develop global internet lines for the national telecommunications network. The Government has also filed against us, LG U+ and SK Broadband (i) a claim for damages of ￦1 billion in July 2020 for collusion in a bidding held by the Ministry of Employment and Labor, (ii) a claim for damages of ￦1 billion in August 2020 for collusion in a bidding held by the Korea Meteorological Administration and (iii) a claim for damages of ￦1 billion in November 2020 for collusion in a bidding for the engagement of telecommunications companies to provide dedicated fixed-line services to the postal service network.

For a description of our additional legal proceedings, see “Item 3. Key Information—Item 3.D. Risk Factors—Legal cases involving our charitable or political donations and other incidents and allegations, including matters connected to a scandal involving Ms. Soon-sil Choi, a confidante of former President Geun-hye Park, could have a material adverse effect on our business, reputation and stock price.”

As of December 31, 2020, we have established provisions relating to litigation proceedings of ￦77 billion. See Note 17 of the notes to the Consolidated Financial Statements.

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)
2016	￦	800		—	￦	800
2017		1,000		—		1,000
2018		1,100		—		1,100
2019		1,100		—		1,100
2020		1,350		—		1,350

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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.

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.”

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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, 2020, 261,111,808 Ordinary Shares were issued, of which 19,269,678 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.

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 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.

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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 December 31 of each year. We pay the annual dividend shortly after the annual general meeting to the shareholders of record as December 31 of the preceding 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 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

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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.

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, 2020, 0.45% 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

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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 December 31 of each 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.

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

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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, except that where voting rights can be exercised electronically, members of the Audit Committee may be elected by an affirmative majority vote of the voting shares present at the meeting. In addition, 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.

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.

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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 account management institution, Kookmin Bank, maintains the electronic register of our shareholders at its office in Seoul, Korea. Our account management institution effects transfers of Shares on the electronic 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 is December 31. Further, we may set a record date for the purpose of determining the shareholders entitled to rights pertaining to the Shares, and we must announce such record date at least two weeks prior to such record date. The trading of Shares and the delivery of share certificates may continue while the register of shareholders is closed.

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 Electronic Registration Act, the transfer of Shares is effected by the electronic registration of such transfers on an electronic registry pursuant to the Electronic Registration Act, under

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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 electronic register of shareholders. For this purpose, a shareholder is required to apply for electronic registration of transfer between accounts. 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 account management institution 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.

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

As of December 31, 2020, there were 19,269,678 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

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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 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.

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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 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;

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• 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 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

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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 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

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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 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.

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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 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

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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 0.08% for any transfers made before January 1, 2023 (transfers made on and after January 1, 2023 will not be subject to such securities transaction tax) 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 0.43% for transfers before January 1, 2023 and 0.35% for transfers on and after January 1, 2023 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.

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.

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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 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);

• 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.

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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 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.

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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 or in the preceding 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 based on the facts and circumstances at the time, some of which may be beyond our control, such as the amount and composition of our income and the valuation and composition of our assets, including goodwill and other intangible assets, as implied by the market price of our ordinary shares. Recent stock market volatility could exacerbate these considerations. See “Item 3. Key Information—Item 3.D. Risk Factors—Risks Relating to Our Business—The ongoing global pandemic of a new strain of coronavirus (“COVID-19”) and any possible recurrence of other types of widespread infectious diseases, may adversely affect our business, financial condition or results of operations.” Accordingly, we cannot be certain that we will not be a PFIC in the current or any future taxable year. 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,

• 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

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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 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

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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 or agriculture and fishery special 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 U.S.$50,000 on the last day of the taxable year or U.S.$75,000 at any time during the taxable year 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 U.S.$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.

Item 10.G.  Statements by Experts

Not applicable.

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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 ￦66 billion, a valuation loss of ￦2 billion and accumulated other comprehensive income of ￦22 billion in 2018, a valuation gain of ￦77 billion, a valuation loss of ￦16 billion and accumulated other comprehensive income of ￦92 billion in 2019, and a valuation loss of ￦164 billion and accumulated other comprehensive loss of ￦114 billion in 2020. For further details regarding the assets, liabilities, gains and losses recorded relating to our derivative contracts outstanding as of December 31 2018, 2019 and 2020, see Note 7 of the notes 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, 2018, 2019 and 2020:

	As of December 31,
	2018				2019				2020
(in thousands of foreign currencies)	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
U.S. Dollar		528,539		1,893,849		645,941		1,830,764		400,046		1,937,935
Special Drawing Right		267		730		255		729		255		728
Japanese Yen		66,078		50,000,000		24,930		80,000,000		209,376		46,000,009
British Pound		—		256		—		56		—		—
Euro		2		6		1		6		316		162
Algerian Dinar		618		—		—		—		—		—
Chinese Yuan		1,954		171		457		161		458		491
Uzbekistani Sum		121,053		—		—		—		—		—
Rwandan Franc		857		—		706		—		646		—
Thai Bhat		—		—		—		—		535		—
Myanmar Kyat		84		—		84		—		—		—
Tanzanian Shilling		—		2,876		6,919		—		1,019		—
Botswana Pula		897		—		911		—		212		—
Hong Kong Dollar		—		—		—		268		—		198
Bangladeshi Taka		39,494		—		18,897		—		—		—
Polish Zloty		26		—		—		—		26		—
Vietnamese Dong		467,272		—		271,563		—		242,370		—
Central African Franc		666		—		97,411		—		16,229		—
Singapore Dollar		—		—		—		—		6		284,000

As of December 31, 2018, a 10% strengthening 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% weakening would have decreased our income before income tax by ￦3 billion and total equity by ￦0.06 billion. As of December 31, 2019, a 10% strengthening in the exchange rate between the Won and all foreign currencies, with all other variables held constant, would have increased our income before income tax by ￦45 billion, and total equity by ￦52 billion, with a 10% weakening in the exchange rate having the opposite effect. As of December 31, 2020, a 10% strengthening in the exchange rate between the Won and all foreign currencies, with all other variables held constant, would have increased our income before income tax by ￦25 billion, and total equity by ￦37 billion, with a 10% weakening in the exchange rate having the opposite effect. 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 of the notes 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, 2020 which are sensitive to exchange rates and/or interest rates. The information is presented in Won, which is our reporting currency:

																December 31, 2020
	2021			2022			2023			2024			Thereafter			Total			Fair Value
	(in millions of Won, except rates)
Local currency:
Fixed rate		1,197,307			560,517			690,498			460,493			1,678,989			4,587,804			5,214,865
Average weighted rate (1)		3.79	%		1.75	%		2.07	%		2.75	%		2.67	%		2.76	%		—
Variable rate		10,000			—			—			—			—			10,000			10,000
Average weighted rate (1)		2.09	%		—			—			—			—			2.09	%		—
Sub-total		1,207,307			560,517			690,498			460,493			1,678,989			4,597,804			5,224,865
Foreign currency:
Fixed rate		168,682			747,261			—			4,217			979,200			1,899,360			1,933,316
Average weighted rate (1)		0.38	%		1.62	%		—			0.33	%		2.28	%		1.85	%		—
Variable rate		42,524			38,830			379,204			380,800			—			841,358			814,015
Average weighted rate (1)		3.76	%		2.17	%		0.97	%		1.22	%		—			1.28	%		—
Subtotal		211,206			786,091			379,204			385,017			979,200			2,740,718			2,747,331
Total		1,418,513			1,346,608			1,069,702			845,510			2,658,189			7,338,522			7,972,196

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

As of December 31, 2018, 2019 and 2020, a 100 basis point increase in the market interest rate, with all other variables held constant, would have increased our profit before income tax by ￦1 billion, increased our profit before income tax by ￦0.4 billion and increased our profit before income tax by ￦1 billion, respectively. As of December 31, 2018, 2019 and 2020, such increase, with all other variables held constant, would have increased our shareholders’ equity by ￦10 billion, increased our shareholders’ equity by ￦15 billion and increased our shareholders’ equity by ￦19 billion, respectively.

As of December 31, 2018, 2019 and 2020, a 100 basis point decrease in the market interest rates, with all other variables held constant, would have decreased our profit before income tax by ￦2 billion, decreased our profit before income tax by ￦0.5 billion and decreased our profit before income tax by ￦1 billion, respectively. As of December 31, 2018, 2019 and 2020, a 100 basis point decrease in the market interest rates, with all other variables held constant, would have decreased our shareholders’ equity by ￦10 billion, ￦19 billion and ￦19 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, 2018, 2019 and 2020, 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 ￦0.9 billion, ￦0.6 billion and by

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￦3.5 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.

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.

111

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.

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 2020, we received the following payments, after deduction of applicable U.S. taxes, from the depositary:

Reimbursement of NYSE listing fees	$	219,577.00
Reimbursement of SEC filing fees	$	23,036.55
Reimbursement of proxy process expenses (printing, postage and distribution)	$	17,627.88
Reimbursement of legal fees (reimbursement received in 2020 in respect of 2019)	$	222,833.28
Contributions toward our investor relations efforts (including non-deal roadshows, investor conferences and investor relations agency fees)	$	138,864.74

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, 2020. 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, 2020. 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, 2020, 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, 2020.

Samil PricewaterhouseCoopers, an independent registered public accounting firm, which also audited our consolidated financial statements as of, and for the year ended December 31, 2020, 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 2020 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 Tae-Yoon Sung, Dae-You Kim, Eun-Jung Yeo and Chung-Gu Kang. The board of directors has determined that Eun-Jung Yeo is the financial expert of the Audit Committee. Eun-Jung Yeo 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 years ended December 31, 2019 and 2020. 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,
	2019		2020
	(In millions)
Audit fees (1)	￦	3,768	￦	3,910
Tax fees (2)		302		181
All other fees		—		—
Total fees		4,070		4,091

(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 of tax returns 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, 2020:

Period	Total Number of Shares Purchased		Average Price Paid per Share (In Won)		Total Number of Shares Purchased as Part of Publicly Announced Plans		Approximate Value of Shares that May Yet Be Purchased Under the Plans (In billions of Won)
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		—		—		—		—
September 1 to September 30		—		—		—		—
October 1 to October 31		—		—		—		—
November 1 to November 30		1,800,000	￦	23,592		1,800,000	￦	257.6
December 1 to December 31		2,750,000		24,593		2,750,000		190.0
Total		4,550,000	￦	24,197		4,550,000	￦	190.0

Repurchases were made in the open market pursuant to the Share Repurchase Agreement, pursuant to which we are authorized to repurchase up to ￦300 billion of our common shares from November 6, 2020 to November 5, 2021.

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 inside director. We also maintain a Corporate Governance Committee comprised of four outside directors and one inside 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 stock grants to officers and inside 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 December  31, 2019 and December 31, 2020		F-5
Consolidated Statements of Operations for the Years Ended December  31, 2018, 2019 and 2020		F-7
Consolidated Statements of Comprehensive Income for the Years Ended December  31, 2018, 2019 and 2020		F-8
Consolidated Statements of Changes in Equity for the Years Ended December  31, 2018, 2019 and 2020		F-9
Consolidated Statements of Cash Flows for the Years Ended December  31, 2018, 2019 and 2020		F-12
Notes to the Consolidated Financial Statements		F-13

118

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 to 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 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)
2.4	Description of common stock (see Item 10.B. Memorandum and Articles of Association)
2.5*	Description of American Depositary Shares (incorporated herein by reference to Exhibit 2.6 of the Registrant’s Annual Report on Form 20-F filed on April 29, 2020)
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.

119

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/ HYEON-MO KU
Name: Hyeon-Mo Ku
Title:	Representative Director and Chief Executive Officer

Date: April 30, 2021

120

INDEX TO FINANCIAL STATEMENTS

	Page
Report of Independent Registered Public Accounting Firm		F-2
Consolidated Statements of Financial Position as of December  31, 2019 and December 31, 2020		F-5
Consolidated Statements of Operations for the Years Ended December  31, 2018, 2019 and 2020		F-7
Consolidated Statements of Comprehensive Income for the Years Ended December  31, 2018, 2019 and 2020		F-8
Consolidated Statements of Changes in Equity for the Years Ended December  31, 2018, 2019 and 2020		F-9
Consolidated Statements of Cash Flows for the Years Ended December  31, 2018, 2019 and 2020		F-12
Notes to the Consolidated Financial Statements		F-13

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 of December 31, 2020 and 2019, 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, 2020, 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 of December 31, 2020, 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 of December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2020 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 of December 31, 2020, based on criteria established in Internal Control—Integrated Framework (2013) issued by the COSO.

Changes in Accounting Principles

As discussed in Note 2 to the consolidated financial statements, the Company changed the manner in which it accounts for leases in 2020 and 2019.

As discussed in Note 2 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 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

F-2

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 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.

Critical Audit Matters

The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that (i) relates to accounts or disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Cash-Generating Units Impairment Assessment—Information and Communication Technology (“ICT”) Segment

As described in Notes 11, 13 and 34 to the consolidated financial statements, the Company’s property and equipment and intangible assets balance was KRW 16,367,377 million as of December 31, 2020. This amount includes KRW 13,583,173 million of property and equipment and intangible assets associated with the Cash-Generating Units in the ICT segment (the “CGUs”). The long-lived assets of the CGUs are primarily comprised of property and equipment and intangible assets. The Company performs its impairment assessment for assets attributed to the CGUs when impairment indicators exist or in the case of goodwill and indefinite lived intangible assets at least annually. The Company identified three CGUs in the ICT segment. Those CGUs are Mobile, Fixed Line and Corporate Services. The Company compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amount of the CGUs was determined based on a discounted cash flow model which requires management to estimate significant assumptions, including revenue growth rate, terminal growth rate and discount rate.

The principal considerations for our determination that performing procedures relating to the CGUs impairment assessment is a critical audit matter are that there was significant judgement by

F-3

management when developing the above estimates which in turn led to a high degree of auditor judgment, subjectivity and effort in performing procedures to evaluate audit evidence related to management’s discounted cash flow model and significant assumptions, including revenue growth rate, terminal growth rate and discount rate. In addition, the audit effort involved the use of professionals with specialized skill and knowledge in performing these procedures and evaluating the audit evidence obtained.

Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to management’s CGUs impairment assessment, including controls over management’s determination of the estimated recoverable amount of each CGU and development of significant assumptions, including revenue growth rate, terminal growth rate and discount rate. These procedures also included, among others, testing management’s process for identifying CGUs and determining the estimated recoverable amount of CGUs, including evaluating the appropriateness of the discounted cash flow model; testing the completeness, accuracy, and relevance of underlying data used in the model; and evaluating the significant assumptions used by management, including the revenue growth rate, terminal growth rate and discount rate. Evaluating management’s assumptions related to the revenue growth rate, terminal growth rate and discount rate involved evaluating whether the assumptions used by management were reasonable considering current and past performance of the CGUs, management’s future plans, external market and industry data and whether these assumptions were consistent with evidence obtained in other areas of the audit. In addition, the discount rate was evaluated considering the cost of capital of comparable businesses and other industry factors. Professionals with specialized skill and knowledge were used to assist in the evaluation of the Company’s discounted cash flow model and significant assumptions, including revenue growth rate, terminal growth rate and discount rate.

/s/ Samil PricewaterhouseCoopers

Seoul, Korea

April 30, 2021

We have served as the Company’s auditor since 2010.

F-4

KT Corporation and Subsidiaries

Consolidated Statements of Financial Position

December 31, 2019 and December 31, 2020

(In millions of Korean won)	Notes		December 31, 2019		December 31, 2020
Assets
Current assets
Cash and cash equivalents		4,5	￦	2,305,894	￦	2,634,624
Trade and other receivables, net		4,6		5,858,696		4,902,471
Other financial assets		4,7		868,388		1,202,840
Current income tax assets				68,120		2,059
Inventories, net		8		791,677		534,636
Assets held for sale		10		83,602		1,198
Other current assets		9		1,999,282		1,876,352
Total current assets				11,975,659		11,154,180
Non-current assets
Trade and other receivables, net		4,6		1,181,798		1,250,769
Other financial assets		4,7		821,658		544,347
Property and equipment, net		11		13,785,299		14,206,119
Right-of-use assets		21		1,268,329		1,217,179
Investment properties, net		12		1,387,430		1,368,453
Intangible assets, net		13		2,834,037		2,161,258
Investments in associates and joint ventures		14		267,660		557,881
Deferred income tax assets		29		424,856		433,698
Other non-current assets		9		685,488		768,661
Total non-current assets				22,656,555		22,508,365
Total assets			￦	34,632,214	￦	33,662,545

F-5

KT Corporation and Subsidiaries

Consolidated Statements of Financial Position (Continued)

December 31, 2019 and December 31, 2020

(In millions of Korean won)	Notes		December 31, 2019			December 31, 2020
Liabilities
Current liabilities
Trade and other payables		4,15	￦	7,597,478		￦	6,210,099
Borrowings		4,16		1,185,725			1,418,114
Other financial liabilities		4,7		943			2,493
Current income tax liabilities				66,266			232,225
Provisions		17		175,612			165,990
Deferred revenue				53,473			60,252
Other current liabilities		9		1,068,557			1,103,299
Total current liabilities				10,148,054			9,192,472
Non-current liabilities
Trade and other payables		4,15		1,082,220			807,540
Borrowings		4,16		6,113,142			5,898,184
Other financial liabilities		4,7		149,136			260,676
Defined benefit liabilities, net		18		365,663			378,087
Provisions		17		78,550			86,202
Deferred revenue				99,180			149,050
Deferred income tax liabilities		29		425,468			429,331
Other non-current liabilities		9		1,030,117			909,570
Total non-current liabilities				9,343,476			8,918,640
Total liabilities				19,491,530			18,111,112
Equity
Share capital		22		1,564,499			1,564,499
Share premium				1,440,258			1,440,258
Retained earnings		23		11,590,916			12,155,420
Accumulated other comprehensive income		24		194,934			86,051
Other components of equity		24		(1,170,083	)		(1,234,784	)
Equity attributable to owners of the Controlling Company				13,620,524			14,011,444
Non-controlling interest				1,520,160			1,539,989
Total equity				15,140,684			15,551,433
Total liabilities and equity			￦	34,632,214		￦	33,662,545

The above consolidated statements of financial position should be read in conjunction with the accompanying notes.

F-6

KT Corporation and Subsidiaries

Consolidated Statements of Operations

Years ended December 31, 2018, 2019 and 2020

(In millions of Korean won)	Notes	2018			2019			2020
Operating revenue	26	￦	23,436,050		￦	24,899,189		￦	24,440,647
Revenue			23,220,052			24,639,758			24,099,394
Others			215,998			259,431			341,253
Operating expenses	27		22,335,190			23,872,219			23,418,314
Operating profit			1,100,860			1,026,970			1,022,333
Finance income	28		374,243			424,395			498,614
Finance costs	28		(435,659	)		(432,133	)		(507,383	)
Share of net profits of associates and joint ventures	14		(5,467	)		(3,304	)		18,041
Profit before income tax			1,033,977			1,015,928			1,031,605
Income tax expense	29		314,565			320,060			285,349
Profit for the year		￦	719,412		￦	695,868		￦	746,256
Profit for the year attributable to:
Owners of the Controlling Company		￦	645,571		￦	645,703		￦	700,889
Non-controlling interest		￦	73,841		￦	50,165		￦	45,367
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	30	￦	2,634		￦	2,634		￦	2,858
Diluted earnings per share	30	￦	2,634		￦	2,632		￦	2,858

The above consolidated statements of operations should be read in conjunction with the accompanying notes.

F-7

KT Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

Years ended December 31, 2018, 2019 and 2020

(In millions of Korean won)
	Notes		2018			2019			2020
Profit for the year			￦	719,412		￦	695,868		￦	746,256
Other comprehensive income
Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability		18		(73,511	)		(25,777	)		(60,181	)
Shares of remeasurement gain (loss) of associates and joint ventures				(816	)		649			786
Gain on valuation of equity instruments at fair value through other comprehensive income				43,077			155,319			51,696
Items that may be subsequently reclassified to profit or loss:
Gain on valuation of debt instruments at fair value through other comprehensive income				734			11,833			(9,699	)
Valuation gain (loss) on cash flow hedge				17,268			67,548			(84,044	)
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)				(44,279	)		(44,684	)		111,431
Share of other comprehensive income (loss) from associates and joint ventures				(41	)		2,517			15,932
Exchange differences on translation of foreign operations				2,940			4,933			(2,666	)
Total other comprehensive income (loss)				(54,628	)		172,338			23,255
Total comprehensive income for the year			￦	664,784		￦	868,206		￦	769,511
Total comprehensive income for the year attributable to:
Owners of the Controlling Company				589,179			768,341			727,077
Non-controlling interest				75,605			99,865			42,434

The above consolidated statements of comprehensive income should be read in conjunction with the accompanying notes.

F-8

KT Corporation and Subsidiaries

Consolidated Statements of Changes in Equity

Years ended December 31, 2018, 2019 and 2020

			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 of 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				—		—		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 liabilities		18		—		—		(61,449	)		—			—			(61,449	)		(12,062	)		(73,511	)
Share of gain on remeasurements of associates and joint ventures				—		—		(816	)		—			—			(816	)		—			(816	)
Share of other comprehensive income of associates and joint ventures				—		—		—			(136	)		—			(136	)		95			(41	)
Valuation losses 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	)
Changes 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 of 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-9

KT Corporation and Subsidiaries

Consolidated Statements of Changes in Equity (Continued)

Years ended December 31, 2018, 2019 and 2020

			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, 2018			￦	1,564,499	￦	1,440,258	￦	11,256,069		￦	50,158	￦	(1,181,083	)	￦	13,129,901		￦	1,528,589		￦	14,658,490
Changes in accounting policy				—		—		(3,890	)		—		—			(3,890	)		—			(3,890	)
Adjusted total equity at the beginning of the financial year				1,564,499		1,440,258		11,252,179			50,158		(1,181,083	)		13,126,011			1,528,589			14,654,600
Comprehensive income
Profit for the year				—		—		645,703			—		—			645,703			50,165			695,868
Remeasurements of net defined benefit liabilities		18		—		—		(22,774	)		—		—			(22,774	)		(3,003	)		(25,777	)
Share of gain on remeasurements of associates and joint ventures				—		—		636			—		—			636			13			649
Share of other comprehensive income of associates and joint ventures				—		—		—			2,427		—			2,427			90			2,517
Valuation loss on cash flow hedge		4,7		—		—		—			22,850		—			22,850			14			22,864
Gain on valuation of financial instruments at fair value		4,7
through other comprehensive income				—		—		—			114,869		—			114,869			52,283			167,152
Exchange differences on translation of foreign operations				—		—		—			4,630		—			4,630			303			4,933
Total comprehensive income for the year				—		—		623,565			144,776		—			768,341			99,865			868,206
Transactions with owners
Dividends paid by the Controlling Company				—		—		(269,659	)		—		—			(269,659	)		—			(269,659	)
Dividends paid to non-controlling interest of subsidiaries				—		—		—			—		—			—			(35,500	)		(35,500	)
Changes in consolidation scope				—		—		—			—		(245	)		(245	)		1,784			1,539
Changes in ownership interest in subsidiaries				—		—		—			—		(9,082	)		(9,082	)		(74,578	)		(83,660	)
Appropriations of loss on disposal of treasury stock				—		—		(15,169	)		—		15,169			—			—			—
Disposal of treasury stock				—		—		—			—		3,346			3,346			—			3,346
Others				—		—		—			—		1,812			1,812			—			1,812
Subtotal				—		—		(284,828	)		—		11,000			(273,828	)		(108,294	)		(382,122	)
Balance as of December 31, 2019			￦	1,564,499	￦	1,440,258	￦	11,590,916		￦	194,934	￦	(1,170,083	)	￦	13,620,524		￦	1,520,160		￦	15,140,684

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 Changes in Equity (Continued)

Years ended December 31, 2018, 2019 and 2020

			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 of January 1, 2020			￦	1,564,499	￦	1,440,258	￦	11,590,916		￦	194,934		￦	(1,170,083	)	￦	13,620,524		￦	1,520,160		￦	15,140,684
Comprehensive income
Profit for the year				—		—		700,889			—			—			700,889			45,367			746,256
Remeasurements of net defined benefit liabilities		18		—		—		(49,554	)		—			—			(49,554	)		(10,627	)		(60,181	)
Share of gain on remeasurements of associates and joint ventures				—		—		410			—			—			410			376			786
Share of other comprehensive income of associates and joint ventures				—		—		—			14,701			—			14,701			1,231			15,932
Valuation loss on cash flow hedge		4,7		—		—		—			27,433			—			27,433			(46	)		27,387
Gain on valuation of financial instruments at fair value through other comprehensive income		4,7		—		—		184,215			(150,135	)		—			34,080			7,917			41,997
Exchange differences on translation of foreign operations				—		—		—			(882	)		—			(882	)		(1,784	)		(2,666	)
Total comprehensive income for the year				—		—		835,960			(108,883	)		—			727,077			42,434			769,511
Transactions with owners
Dividends paid by the Controlling Company				—		—		(269,766	)		—			—			(269,766	)		—			(269,766	)
Dividends paid to non-controlling interest of subsidiaries				—		—		—			—			—			—			(40,802	)		(40,802	)
Changes in ownership interest in subsidiaries				—		—		—			—			11,628			11,628			18,197			29,825
Appropriations of loss on disposal of treasury stock				—		—		(1,690	)		—			1,690			—			—			—
Acquisition of treasury stock				—		—		—			—			(110,097	)		(110,097	)		—			(110,097	)
Disposal of treasury stock				—		—		—			—			33,213			33,213			—			33,213
Others				—		—		—			—			(1,135	)		(1,135	)		—			(1,135	)
Subtotal				—		—		(271,456	)		—			(64,701	)		(336,157	)		(22,605	)		(358,762	)
Balance as of December 31, 2020			￦	1,564,499	￦	1,440,258	￦	12,155,420		￦	86,051		￦	(1,234,784	)	￦	14,011,444		￦	1,539,989		￦	15,551,433

The above consolidated statements of changes in equity should be read in conjunction with the accompanying notes.

F-11

KT Corporation and Subsidiaries

Consolidated Statements of Cash Flows

Years ended December 31, 2018, 2019 and 2020

(In millions of Korean won)
	Notes		2018			2019			2020
Cash flows from operating activities
Cash generated from operations		32	￦	4,212,222		￦	4,058,065		￦	4,745,293
Interest paid				(304,428	)		(255,908	)		(254,852	)
Interest received				242,951			276,349			259,836
Dividends received				14,074			18,922			19,623
Income tax paid				(154,355	)		(352,255	)		(30,073	)
Net cash inflow from operating activities				4,010,464			3,745,173			4,739,827
Cash flows from investing activities
Collection of loans				64,023			63,517			63,435
Loans granted				(60,229	)		(65,138	)		(48,731	)
Disposal of financial assets at fair value through profit or loss				397,224			720,148			528,655
Disposal of financial assets at amortized cost				255,290			422,637			528,746
Disposal of financial assets at fair value through other comprehensive income				2,474			—			351,065
Disposal of assets held-for-sale				9,842			28,834			83,241
Disposal of investments in associates and joint ventures				7,832			16,930			24
Acquisition of investments in associates and joint ventures				(34,420	)		(29,980	)		(273,411	)
Disposal of property and equipment, and investment properties				90,992			42,554			49,832
Acquisition of property and equipment, and investment properties				(2,260,879	)		(3,263,338	)		(3,207,566	)
Acquisition of financial assets at fair value through profit or loss				(158,787	)		(793,977	)		(521,142	)
Acquisition of financial assets at amortized cost				(248,789	)		(501,838	)		(759,180	)
Acquisition of financial assets at fair value through other comprehensive income				(16,239	)		(14,277	)		(14,092	)
Disposal of intangible assets				20,037			12,097			13,362
Disposal of right-of-use assets				—			9,393			2,023
Discontinued operations				—			1,977			205
Acquisition of intangible assets				(746,213	)		(530,775	)		(511,094	)
Acquisition of right-of-use assets				—			(6,236	)		(5,824	)
Decrease in cash due to business combination, etc.				(26,288	)		—			(41,018	)
Net cash outflow from investing activities				(2,704,130	)		(3,887,472	)		(3,761,470	)
Cash flows from financing activities		33
Proceeds from borrowings and debentures				1,473,016			1,951,568			1,795,221
Repayments of borrowings and debentures				(1,612,731	)		(1,377,394	)		(1,627,354	)
Settlement of derivative assets and liabilities, net				(3,461	)		23,901			36,594
Cash outflow from consolidated capital transactions				(5,506	)		(122,918	)		(1,192	)
Cash inflow from other financing activities				13,939			65,698			35,854
Dividends paid to shareholders				(298,632	)		(305,159	)		(310,567	)
Acquisition of treasury stock				(24,415	)		—			(114,683	)
Decrease in finance leases liabilities				(73,885	)		(485,444	)		(447,784	)
Decrease in other liabilities				—			—			(13,674	)
Net cash outflow from financing activities				(531,675	)		(249,748	)		(647,585	)
Effect of exchange rate change on cash and cash equivalents				581			(5,481	)		(2,042	)
Net increase (decrease) in cash and cash equivalents				775,240			(397,528	)		328,730
Cash and cash equivalents
Beginning of the year		5		1,928,182			2,703,422			2,305,894
End of the year		5	￦	2,703,422		￦	2,305,894		￦	2,634,624

The above consolidated statements of cash flows should be read in conjunction with the accompanying notes.

F-12

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

1. General Information

The consolidated financial statements as of December 31, 2020 include the accounts of KT Corporation, which is the controlling company as defined under IFRS 10, Consolidated Financial Statements, and its 64 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, 2019 and 2020, are as follows:

			Controlling percentage ownership1
Subsidiary	Type of business	Location	December 31, 2019	December 31, 2020	Closing month
KT Powertel Co., Ltd. 2	Trunk Radio System (TRS) business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	92.4%	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.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
KT Strategic Investment Fund No.5	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	100.0%	100.0%	December

F-13

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

			Controlling percentage ownership1
Subsidiary	Type of business	Location	December 31, 2019	December 31, 2020	Closing month
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	64.5%	64.5%	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) 2,4	Online music production and distribution	Korea	36.0%	36.2%	December
KT MOS Bukbu Co., Ltd. 4	Telecommunication facility maintenance	Korea	100.0%	100.0%	December
KT MOS Nambu Co., Ltd. 4	Telecommunication facility maintenance	Korea	98.4%	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
KTGDH Co., Ltd. (KTSB Data Service)	Data centre development and related service	Korea	100.0%	100.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3,4	Solution provider and IPTV advertisement sales business	Korea	44.0%	44.0%	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 Contents Fund	Content investment business	Korea	88.6%	88.6%	December
Autopion Co., Ltd.	Information and communication service	Korea	100.0%	100.0%	December
KTCS Corporation 2,4	Database and online information provider	Korea	30.9%	31.9%	December
KTIS Corporation 2,4	Database and online information provider	Korea	30.1%	30.8%	December
KT M Mobile Co., Ltd.	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	Korea	100.0%	70.4%	December

F-14

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

			Controlling percentage ownership1
Subsidiary	Type of business	Location	December 31, 2019	December 31, 2020	Closing month
Next Connect PFV	Residential building development and supply	Korea	100.0%	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
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.z o.o.	Electronic communication business	Poland	97.2%	97.4%	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
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.6%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hong Kong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December
Texnoprosistem LLC	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Co., Ltd.	Internet advertising solution provider	Thailand	99.9%	99.9%	December
KT Huimangjieum	Manufacturing	Korea	100.0%	100.0%	December
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.	Residential building investment and rent	Korea	63.5%	68.1%	December
K-REALTY RENTAL HOUSING REIT 3	Residential building	Korea	100.0%	88.6%	December
Storywiz Co., Ltd	Content and software development and supply	Korea	—	100.0%	December
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Telecommunication facility construction and maintenance	Korea	—	100.0%	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.

F-15

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Changes in scope of consolidation in 2020 are as follows:

Changes	Location	Name of Subsidiary	Reason
Included	Korea	Storywiz Co., Ltd	Newly established
	Korea	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Transferred
Excluded	Uzbekistan	Super iMax LLC	Merged
	Indonesia	PT. KT Indonesia	Liquidated
	Belgium	KT ORS Belgium	Liquidated

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2018, 2019 and 2020, is as follows:

(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
KTGDH Co., Ltd. (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 Co., Ltd.		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

F-16

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	2018
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
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.

(In millions of Korean won)	2019
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	118,052	￦	19,766	￦	62,846	￦	3,085
KT Linkus Co., Ltd.		70,494		62,088		97,892		(2,258	)
KT Submarine Co., Ltd.		120,947		18,452		55,244		486
KT Telecop Co., Ltd.		279,878		153,841		332,063		(4,875	)
KT Hitel Co., Ltd.		279,818		74,769		323,065		1,426
KT Service Bukbu Co., Ltd.		64,802		58,984		219,427		(445	)
KT Service Nambu Co., Ltd.		63,917		55,548		266,148		280
BC Card Co., Ltd.1		3,912,982		2,594,232		3,553,008		115,885
H&C Network1		282,016		68,401		320,701		(1,593	)
Nasmedia Co., Ltd.1		356,236		203,105		117,550		22,484
KTDS Co., Ltd.1		158,153		105,462		428,758		9,027
KT M Hows Co., Ltd.		74,326		50,638		33,443		6,771
KT M&S Co., Ltd.		248,142		215,777		813,498		12,732
GENIE Music Corporation (KT Music Corporation)		234,131		80,952		230,480		7,658
KT MOS Bukbu Co., Ltd.		33,376		28,841		63,761		353
KT MOS Nambu Co., Ltd.		34,258		26,722		67,300		3,099
KT Skylife Co., Ltd.1		848,276		142,839		704,996		56,008
KT Estate Inc.1		1,686,000		295,706		485,686		48,552
KTGDH Co., Ltd. (KTSB Data service)		10,437		1,628		3,977		344
KT Sat Co., Ltd.		651,195		127,523		168,376		16,497
KT Sports Co., Ltd.		15,603		8,333		55,241		(464	)
KT Music Contents Fund No.1		10,579		1,677		521		345
KT Music Contents Fund No.2		7,675		279		331		48
KT-Michigan Global Content Fund		11,688		61		248		(1,113	)
Autopion Co., Ltd.		7,460		4,894		5,604		(302	)
KT M mobile Co., Ltd.		135,917		30,603		161,720		(5,580	)
KT Investment Co., Ltd.1		73,463		56,212		13,375		847
KTCS Corporation1		378,171		213,983		944,778		7,597

F-17

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	2019
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KTIS Corporation		305,798		137,524		454,561		9,205
Next connect PFV		385,412		24,275		1,590		(5,898	)
Korea Telecom Japan Co., Ltd.1		1,851		2,858		2,891		651
Korea Telecom China Co., Ltd.		879		39		844		192
KT Dutch B.V.		31,003		50		—		(242	)
Super iMax LLC		3,568		5,304		4,604		(631	)
East Telecom LLC1		20,857		16,302		17,186		2,140
Korea Telecom America, Inc.		4,611		537		6,808		572
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		132,461		183,164		18,013		(31,662	)
KT Belgium		93,321		11		—		(64	)
KT ORS Belgium		6,913		14		—		(43	)
KBTO sp.zo.o.		1,767		245		519		(3,457	)
AOS Ltd.2		12,337		3,993		6,982		(591	)
KT Hongkong Telecommunications Co., Ltd.		5,126		2,923		13,321		586
KT Huimangjieum		2,129		1,019		1,027		(390	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		6,285		1,139		176		70
K-REALTY RENTAL HOUSING REIT 3		300		—		—		—

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.

(In millions of Korean won)	2020
	Total assets		Total liabilities		Operating revenues		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	119,694	￦	18,833	￦	65,897	￦	3,809
KT Linkus Co., Ltd.		58,372		54,022		84,519		(3,212	)
KT Submarine Co., Ltd.		116,813		14,032		110,201		1,197
KT Telecop Co., Ltd.		318,456		193,737		392,489		212
KT Hitel Co., Ltd.		288,949		92,599		350,231		2,080
KT Service Bukbu Co., Ltd.		60,825		56,554		217,451		(871	)
KT Service Nambu Co., Ltd.		58,182		51,460		264,776		(456	)
BC Card Co., Ltd. 1		3,084,398		1,778,751		3,387,640		39,455
H&C Network 1		269,651		61,365		322,690		2,413
Nasmedia Co., Ltd. 1		422,039		221,371		113,136		23,134
KTDS Co., Ltd. 1		183,297		133,129		499,990		10,635
KT M Hows Co., Ltd.		104,704		76,315		44,860		6,935
KT M&S Co., Ltd.		231,260		197,306		661,533		(485	)
GENIE Music Corporation (KT Music Corporation)		250,538		88,488		247,237		9,472
KT MOS Bukbu Co., Ltd.		32,167		26,070		67,975		1,473
KT MOS Nambu Co., Ltd.		33,765		24,947		71,259		1,639
KT Skylife Co., Ltd. 1		919,476		175,039		706,631		58,190
KT Estate Inc. 1		1,689,601		325,429		365,335		14,370
KTGDH Co., Ltd. (KTSB Data Service)		11,003		1,669		4,282		538
KT Sat Co., Ltd.		630,740		92,791		173,693		14,753

F-18

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	2020
	Total assets		Total liabilities		Operating revenues			Profit (loss) for the year
KT Sports Co., Ltd.		26,572		14,940		46,608			(2,516	)
KT Music Contents Fund No.1		4,844		1,525		243			84
KT Music Contents Fund No.2		15,021		285		169			(116	)
KT-Michigan Global Contents Fund		10,382		175		111			(1,420	)
Autopion Co., Ltd.		4,903		4,961		6,174			(2,459	)
KT M Mobile Co., Ltd.		129,011		27,281		163,472			(3,617	)
KT Investment Co., Ltd. 1		115,627		93,695		47,801			4,680
KTCS Corporation 1		384,919		215,175		933,006			11,323
KTIS Corporation		294,289		126,894		454,172			7,387
Next Connect PFV		394,268		37,271		26			(7,101	)
Korea Telecom Japan Co., Ltd. 1		2,694		2,622		1,853			1
Korea Telecom China Co., Ltd.		381		21		618			(492	)
KT Dutch B.V. 1		29,585		10,109		26,782			6,061
Korea Telecom America, Inc.		4,498		125		6,808			712
KT Rwanda Networks Ltd. 2		114,768		191,781		17,870			(34,610	)
KT Belgium		87,608		—		(81	)		(81	)
KBTO sp.z o.o.		438		117		490			(2,823	)
AOS Ltd. 2		11,812		3,875		5,719			296
KT Hong Kong Telecommunications Co., Ltd.		6,159		2,800		16,386			1,308
KT Huimangjieum		3,720		2,787		5,239			(13	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		5,703		1,165		333			83
Storywiz Co., Ltd		21,594		10,065		19,209			(1,954	)
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)		138,220		102,963		346,040			(8,461	)

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 financial statements have been prepared on a historical cost basis, except for the following:

• Certain financial assets and liabilities (including derivative instruments) – measured at fair value

F-19

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

• Assets held-for-sale – measured at fair value less costs to sell

• Defined benefit pension plans – plan assets measured at fair value

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.

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, 2020.

- Amendments to IAS 1 Presentation of Financial Statements and IAS 8 Accounting policies, changes in accounting estimates and errors – Definition of Material

The amendments clarify the definition of material. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that the primary users of general-purpose financial statements make on the basis of those financial statements. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 3 Business Combination – Definition of a Business

The amended definition of a business requires an acquisition to include an input and a substantive process that together significantly contribute to the ability to create outputs and the definition of output excludes the returns in the form of lower costs and other economic benefits. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, an entity may elect to apply an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement and IFRS 7 Financial Instruments: Disclosure – Interest Rate Benchmark Reform

The amendments allow to apply the exceptions when forward-looking analysis is performed in relation the application of hedge accounting, while uncertainties arising from interest rate benchmark reform exist. The exceptions require the Group assumes that the interest rate benchmark, on which the hedged items and the hedging instruments are based on, is not altered as a result of interest rate benchmark reform, when determining whether the expected cash flows are highly probable, whether an economic relationship between the hedged item and the hedging instrument exists, and when assessing the hedging relationship is highly effective.

The Group’s risk exposure, directly affected by the interest rate benchmark reform, is the variable rate borrowings of USD 519,598,989 and SGD 284,000,000 with maximum remaining maturity of four years. To hedge fluctuations in cash flows of borrowings resulting from the changes in USD

F-20

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

LIBOR of 3 months and SGD SOR of 6 months—an interest rate benchmark, the Group entered into an interest rate swap contract for a nominal amount of USD 519,598,989 and SGD 284,000,000 and designated it as a hedging instrument of cash flow hedge.

- Agenda Decision of the International Accounting Standards Interpretations Committee – Lease Period

The IFRS Interpretations Committee (IFRS IC) announced on December 16, 2019 that all economic penalties resulting from the termination of a lease are taken into account when determining the enforceable period for ‘Lease Term and Useful Life of Leasehold Improvements’. The Group’s changes in accounting policy have been adopted retrospectively in accordance with IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, and the comparative financial statements as at December 31, 2019 and for the year then ended have been adjusted (Note 41).

(2) New standards and interpretations not yet adopted by the Group

The following new accounting standards and interpretations have been published that are not mandatory for December 31, 2020 reporting periods and have not been early adopted by the Group.

- Amendments to IFRS 16 Lease – Practical expedient for COVID-19—Related Rent Exemption, Concessions, Suspension

As a practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 pandemic is a lease modification, and the amounts recognized in profit or loss as a result of applying this exemption should be disclosed. The amendments should be applied for annual periods beginning on or after June 1, 2020, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement, IFRS 7 Financial Instruments: Disclosure, IFRS 4 Insurance Contracts and IFRS 16 Lease – Interest Rate Benchmark Reform

In relation to interest rate benchmark reform, the amendments provide exceptions including adjust effective interest rate instead of book amounts when interest rate benchmark of financial instruments at amortized costs is replaced, and apply hedge accounting without discontinuance although the interest rate benchmark is replaced in hedging relationship. The amendments should be applied for annual periods beginning on or after January 1, 2021, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IFRS 3 Business Combination – Reference to the Conceptual Framework

The amendments update a reference of definition of assets and liabilities qualify for recognition in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS 37

F-21

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Provisions, Contingent Liabilities and Contingent Assets, and IFRIC 21 Levies. The amendments also confirm that contingent assets should not be recognized at the acquisition date. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IAS 16 Property, Plant and Equipment—Proceeds Before Intended Use

The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IAS 37 Provisions, Contingent Liabilities and Contingent Assets—Onerous Contracts: Cost of Fulfilling a Contract

The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Annual improvements to IFRS 2018-2020

Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

• IFRS 1 First time Adoption of Korean International Financial Reporting Standards – Subsidiaries that are first-time adopters

• IFRS 9 Financial Instruments – Fees related to the 10% test for derecognition of financial liabilities

• IFRS 16 Leases – Lease incentives

• IAS 41 Agriculture – Measuring fair value

- Amendments to IAS 1 Presentation of Financial Statements—Classification of Liabilities as Current or Non-Current

The amendments clarify that liabilities are classified as either current or non-current, depending on the substantive rights that exist at the end of the reporting period. Classification is unaffected by the likelihood that an entity will exercise right to defer settlement of the liability or the expectations of management. Also, the settlement of liability include the transfer of the entity’s own equity instruments, however, it would be excluded if an option to settle them by the entity’s own equity instruments if compound financial instruments meets the definition of equity instruments and is recognized separately from the liability. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

F-22

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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.

F-23

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(4) Associates

Associates are entities over which the Group has significant influence but does not possess control or joint control. Investments in associates are accounted for using the equity method of accounting, after initially being recognized at cost. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If the Group’s share of losses of an associate equals or exceeds its interest in the associate (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associate. If there is an objective evidence of impairment for the investment in the associate, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss. If an associate uses accounting policies other than those of the Group for transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associate’s accounting policies conform to those of the Group when the associate’s financial statements are used by the Group in applying the equity method.

(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

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Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 that relate to borrowings are presented in the consolidated statements of operations, within finance costs. All other foreign exchange gains and losses are presented in the consolidated statements of operations within operating revenue or operating expenses.

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 consolidated statements of operations 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 comprise cash balances, call deposits and investment securities with

maturities of three months or less from the acquisition date that are easily convertible to cash and

subject to an insignificant risk of changes in their fair value.

2.7 Financial Assets

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, the Group recorded the cumulative effect as at the date of the initial application of the standards as an adjustment to the initial balance in the retained earnings.

(1) Classification

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.

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Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

loss and presented net in the consolidated statements of operations 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 consolidated statements of operations 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.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 the amount of consideration that is unconditional, unless they contain significant financing components when they are recognized at fair value. Trade receivables are 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.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

2.11 Assets (or Disposal Group) Held-for-sale

Assets(or disposal group) are classified as assets held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continued use and when a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less selling costs.

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 are directly attributable to the acquisition of the items.

Depreciation of all property 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 (1) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested at least 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.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Goodwill impairment reviews are undertaken at least 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	4 – 6 years
Frequency usage rights	5 – 10 years
Others1	1 – 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 consolidated statements of operations.

2.17 Impairment of Non-Financial Assets

Goodwill and intangible assets with indefinite useful life are tested at least annually for impairment at the end of each reporting period. If certain assets are deemed to be impaired, their recoverable amount is estimated in order to determine the impairment loss. The Group estimates the

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

recoverable amount for each asset, and in cases when the recoverable amount cannot be estimated for an asset, the recoverable amount of the cash generating unit to which the asset belongs is estimated. Corporate assets are allocated to individual cash generating units on a reasonable and consistent basis and if they cannot be allocated to individual cash generating units, they are allocated to the smallest group of cash generating units on a reasonable and consistent basis. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount (higher of its fair value less costs of disposal and value in use). Impairment loss on non-financial assets other than goodwill are evaluated for reversal 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 measured 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.

All non-derivative financial liabilities except the following are classified as financial liabilities measured at amortized cost.

• Financial liabilities at fair value through profit or loss

• Financial guarantee contract

• Financial liabilities arising when the transfer of financial assets does not meet the elimination conditions

Financial liabilities measured at amortized cost are displayed in the statement of financial position as ‘Trade and other payables’, ‘Borrowings’ and ‘Other financial liabilities’.

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 consolidated statements of operations 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 they are 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

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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

• 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 at least 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.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(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 at least 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, recoveries, litigations and claims, and others are recognized when the Group presently hold legal or constructive obligation as a result of past events, and when 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

As at January 1, 2019, with implementation of IFRS 16 Leases, the Group has changed accounting policy. The Group has adopted IFRS 16 modified retrospectively, as permitted under the specific transitional provisions in the standard, and recognized the cumulative impact of initially applying the standard as at January 1, 2019.

As explained in “Note 2.2 (1)” above, the Group has changed its accounting policy for leases. The impact of the new accounting policies is disclosed in Note 41.

(1) Lessee

The Group leases various repeater server rack, offices, track facilities, machinery and cars.

Contracts may contain both lease and non-lease components. The Group allocates the consideration in the contract to the lease and non-lease components based on their relative stand-alone prices. However, for leases of real estate for which the Group is lessee, the Group applies the practical expedient which has elected not to separate lease and non-lease components and instead accounts them as a single lease component.

Assets and liabilities arising from a lease are initially measured on a present value basis. Lease liabilities include the net present value of the following lease payments:

• Fixed payments (including in-substance fixed payments), less any lease incentives receivable

• Variable lease payment that are based on an index or a rate, initially measured using the index or rate as at the commencement date

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

• Amounts expected to be payable by the Group (the lessee) under residual value guarantees

• The exercise price of a purchase option if the Group (the lessee) is reasonably certain to exercise that option, and

• Payments of penalties for terminating the lease, if the lease term reflects the Group (the lessee) exercising that option

Lease liability measurement also include payments to be made in option periods if the lessee is reasonably certain in exercising an option to extend the lease.

The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable.

The lease payments are discounted using the interest rate implicit in the lease. If that rate cannot be determined, the lessee’s incremental borrowing rate is used, which is the rate that the lessee would have to pay to borrow the funds necessary to obtain an asset of similar value in a similar economic environment with similar terms and conditions.

The Group is exposed to potential future increases in variable lease payments based on an index or rate, which are not included in the lease liability until they take effect. When adjustments to lease payments based on an index or rate take effect, the lease liability is reassessed and adjusted against the right-of-use asset.

Each lease payment is allocated between the liability and finance cost. The finance cost is charged to profit or loss over the lease period in order to produce a constant periodic rate of interest on the remaining balance of the liability for each period.

Right-of-use assets are measured at cost comprising the following:

• amount of the initial measurement of lease liability

• any lease payments made at or before the commencement date less any lease incentives received

• any initial direct costs (leasehold deposits)

• restoration costs, and

• present value discount on leasehold deposit

The right-of-use asset is depreciated over the shorter of the asset’s useful life and the lease term on a straight-line basis. If the Group is reasonably certain to exercise a purchase option, the right-of-use asset is depreciated over the underlying asset’s useful life.

Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less, such as mechanical devices and cars. Low-value assets are comprised of tools, equipment, and others.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(2) Lessor

Lease income from operating leases where the Group is a lessor is recognized in income on a straight- line basis over the lease term. Initial direct costs incurred in obtaining an operating lease are added to the carrying amount of the underlying asset and recognized as expense over the lease term on the same basis as lease income. The respective leased assets are included in the statement of financial position based on their nature.

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 modified 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 modified 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 are considered a separate performance obligations. 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).

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 profit.

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, 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

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

fees 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 for 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 liabilities are offset when the Group has a legally enforceable right to offset and intends either to settle on a net basis, or to realize the assets and settle the liability simultaneously.

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.

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KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

2.28 Dividend

Dividend distribution to the Group’s shareholders is recognized as a liability in the consolidated financial statements in the period in which the dividends are approved by the Group’s shareholders.

2.29 Approval of the Consolidated Financial Statements

The consolidated financial statements for 2020 were approved for issuance by the Board of Directors on April 13, 2021.

3. Critical Accounting Estimates and Assumptions

The Group makes estimates and assumptions concerning the future. The estimates and assumptions are continuously evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the current circumstances. Actual results may differ from these estimates.

During 2020, the spread of Coronavirus disease 2019 (“COVID-19”) had a material impact on the global economy. It may have a negative impact; such as, decrease in productivity, decrease or delay in sales, collection of existing receivables and others. Accordingly, it may have a negative impact on the financial position and financial performance of the Group.

Significant accounting estimates and assumptions applied in the preparation of the consolidated financial statements can be adjusted depending on changes in the uncertainty from COVID-19. Also, the ultimate effect of COVID-19 to the Group’s business, financial position and financial performance cannot presently be determined.

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 Impairment of Non-Financial Assets (including Goodwill)

The Group determines the recoverable amount of a cash generating unit (CGU) based on fair value or value-in-use calculations assess non-financial assets (including goodwill) for impairment (Note 13).

3.2 Income Taxes

The Group’s taxable income generated from these operations are subject to income taxes based on tax laws and interpretations of tax authorities in numerous jurisdictions. There are many transactions and calculations for which the ultimate tax determination is uncertain (Note 29).

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-38

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 (Note 36).

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. 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 and golf club memberships 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.

3.9 Lease Term

In determining the lease term, management considers the facts and circumstances that create an economic incentive to exercise an extension option, or not exercise a termination option. Extension options (or periods after termination options) are only included in the lease term if the lease is reasonably certain to be extended (or not terminated).

F-39

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

For leases of property, machinery and communication line facilities, the following factors are normally the most relevant:

• If there are significant penalties to terminate (or not extend), the Group is typically reasonably certain to extend (or not terminate).

• If any leasehold improvements are expected to have a significant remaining value, the Group is typically reasonably certain to extend (or not terminate).

• Otherwise, the Group considers other factors including historical lease durations and the costs and business disruption required to replace the leased asset.

Most extension options in offices, retail stores and vehicles leases have not been included in the lease liability, because the Group could replace the assets without significant cost or business disruption.

The lease term is reassessed if an option is actually exercised (or not exercised) or the Group becomes obliged to exercise (or not exercise) it. The assessment of reasonable certainty is only revised if a significant event or a significant change in circumstances occurs, which affects this assessment, and that is within the control of the lessee.

Details on the current period’s financial impact from changes in accounting policies, to reflect exercising extension and termination options, are disclosed in Note 41.

4. Financial Instruments by Category

Financial instruments by category as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
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	￦	2,305,894	￦	—	￦	—	￦	—	￦	2,305,894
Trade and other receivables1		5,748,459		—		1,256,266		—		7,004,725
Other financial assets		441,804		632,324		557,342		58,576		1,690,046

¹ Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2019
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	￦	8,679,698	￦	—	￦	—	￦	8,679,698
Borrowings		7,298,867		—		—		7,298,867
Other financial liabilities		129,945		38		20,096		150,079

F-40

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	December 31, 2020
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	￦	2,634,624	￦	—	￦	—	￦	—	￦	2,634,624
Trade and other receivables1		4,976,423		—		1,118,619		—		6,095,042
Other financial assets		671,068		809,919		258,516		7,684		1,747,187

¹ Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2020
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	￦	7,017,639	￦	—	￦	—	￦	7,017,639
Borrowings		7,316,298		—		—		7,316,298
Other financial liabilities		132,558		2,682		127,929		263,169

Gains or losses arising from financial instruments by category for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Financial assets at amortized cost
Interest income1,5	￦	93,233		￦	79,838		￦	55,742
Gain(loss) on foreign currency transaction4		19,396			32,293			(19,244	)
Loss on foreign currency translation4		(2,901	)		(474	)		(3,895	)
Gain(loss) on disposal		44			(43	)		138
Loss on valuation		(110,544	)		(59,947	)		(140,474	)
Financial assets at fair value through profit or loss
Interest income1		9,194			5,634			6,548
Dividend income6		1,207			1,096			4,379
Gain on valuation7		10,768			4,334			59,044
Gain on disposal		1,713			5,115			(329	)
Loss on foreign currency transaction4		—			—			(38	)
Loss on foreign currency translation4		—			(27	)		—
Financial assets at fair value through other comprehensive income
Interest income1		163,390			217,355			227,736
Dividend income6		1,704			2,312			56
Impairment loss		(2,416	)		(304	)		—
Loss on disposal		(13,818	)		(11,247	)		(8,152	)
Other comprehensive income for the year2		43,811			167,152			41,997

F-41

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	2018			2019			2020
Derivative assets used for hedging
Gain on transaction		7,272			6,332			6,050
Gain(loss) on valuation		22,065			56,537			(2,707	)
Other comprehensive income(loss) for the year2		20,078			46,806			(2,373	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(15,891	)		(39,604	)		3,645
Financial liabilities at fair value through profit or loss
Gain on disposal		—			2,664			799
Gain(loss) on valuation		(2,708	)		(1,936	)		119
Derivative liabilities used for hedging
Gain on transactions		20,678			—			1,141
Gain(loss) on valuation		42,195			4,949			(161,003	)
Other comprehensive income for the year2		(2,810	)		20,742			(81,671	)
Reclassified to profit or loss from other comprehensive income for the year 2,3		(28,388	)		(5,080	)		107,786
Financial liabilities at amortized cost
Interest expense1,5		(296,894	)		(223,974	)		(220,945	)
Loss on repayment		(15	)		—			—
Loss on foreign currency transaction4		(30,956	)		(20,958	)		(10,717	)
Gain(loss) on foreign currency translation4		(66,050	)		(75,502	)		141,849
Total	￦	(116,643	)	￦	214,063		￦	5,481

1 BC Card, a subsidiary of the Group, recognized interest income and expense as operating revenue and expense, respectively. Related interest income recognized as operating revenue is ￦ 20,854 million (2018: ￦ 21,021 million, 2019: ￦ 21,018 million) and interest expense recognized as operating expense is ￦ 1,456 million (2018: ￦ 21 million, 2019: ￦ 548 million) for the year ended December 31, 2020.

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 Co., Ltd., a subsidiary of the Group recognized foreign currency translation/transaction gain and loss and as operating income and expenses. In relation to this, foreign currency translation gain and loss recognized as operating revenue and expense amount to ￦ 56 million (2018: ￦ 0 million. 2019: ￦ 5 million) and ￦ 19,687 million (2018: ￦ 20,422 million, 2019: ￦ 17,006 million), respectively, for the year ended December 31, 2020.

5 Interest income (interest expense) from lease receivables (lease liabilities) is excluded as it is not subject to classification of financial instruments (Note 21).

6 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ 2,059 million (2018: ￦ 1,598 million, 2019: ￦ 2,250 million) for the year ended December 31, 2020.

7 KT Investment Co., Ltd., etc., subsidiaries of the Group, recognized financial instruments measured at fair value through profit or loss as operating income and expenses. In relation to this, valuation gain and loss recognized as operating revenue and expense amount to ￦ 40,822 million (2018: ￦ (-) 5 million, 2019: ￦ 15,429 million), for the year ended December 31, 2020.

F-42

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

5. Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019	December 31, 2020	Description
Bank deposits	￦21,290	￦28,414	Deposit restricted for government 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, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,451,107	￦	(291,202	)	￦	(9,510	)	￦	3,150,395
Other receivables		2,787,144		(78,572	)		(271	)		2,708,301
	￦	6,238,251	￦	(369,774	)	￦	(9,781	)	￦	5,858,696
Non-current assets
Trade receivables	￦	874,860	￦	(4,117	)	￦	(43,597	)	￦	827,146
Other receivables		382,468		(5,108	)		(22,708	)		354,652
	￦	1,257,328	￦	(9,225	)	￦	(66,305	)	￦	1,181,798

	December 31, 2020
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,388,099	￦	(322,992	)	￦	(8,977	)	￦	3,056,130
Other receivables		1,948,108		(101,619	)		(148	)		1,846,341
	￦	5,336,207	￦	(424,611	)	￦	(9,125	)	￦	4,902,471
Non-current assets
Trade receivables	￦	892,992	￦	(4,323	)	￦	(34,716	)	￦	853,953
Other receivables		513,926		(102,985	)		(14,125	)		396,816
	￦	1,406,918	￦	(107,308	)	￦	(48,841	)	￦	1,250,769

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.

F-43

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Details of changes in provision for impairment for the years ended December 31, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	359,924		￦	93,822		￦	295,319		￦	83,680
Provision		24,596			35,597			89,097			50,860
Reversal		—			(475	)		—			(890	)
Written-off or transfer out		(90,513	)		(44,108	)		(60,598	)		(25,067	)
Change in consolidation scope		—			—			3,211			87,614
Others		1,312			(1,156	)		286			8,407
Ending balance	￦	295,319		￦	83,680		￦	327,315		￦	204,604

Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs.

Details of other receivables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Loans	￦	84,148		￦	116,082
Receivables1		2,540,315			1,699,608
Accrued income		8,630			6,901
Refundable deposits		352,293			350,180
Loans receivable		105,961			150,527
Finance lease receivables		39,726			64,047
Others		15,560			60,416
Less: Provision for impairment		(83,680	)		(204,604	)
	￦	3,062,953		￦	2,243,157

1 Settlement receivables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 986,384 million related to debit and credit card transactions are included as at December 31, 2020 (2019: ￦ 1,786,610 million).

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, 2020.

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-44

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

7. Other Financial Assets and Liabilities

Details of other financial assets and liabilities as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other financial assets
Financial assets at amortized cost1	￦	441,804		￦	671,068
Financial assets at fair value through profit or loss1,2,3		632,324			809,919
Financial assets at fair value through other comprehensive income1,3		557,342			258,516
Derivative used for hedging		58,576			7,684
Less: Non-current		(821,658	)		(544,347	)
Current	￦	868,388		￦	1,202,840
Other financial liabilities
Financial liabilities at amortized cost	￦	129,945		￦	132,558
Financial liabilities at fair value through profit or loss		38			2,682
Derivatives used for hedging		20,096			127,929
Less: Non-current		(149,136	)		(260,676	)
Current	￦	943		￦	2,493

1 As at December 31, 2020, the Group’s other financial assets amounting to ￦ 104,442 million (2019: ￦ 91,445 million), which consist of checking account deposits and payment guarantee, are subject to withdrawal restrictions.

2 As at December 31, 2020, MMW (Money Market Wrap) and MMT (Money Market Trust) amounting to ￦ 509,068 million (2019: ￦ 406,062 million) is included in other financial assets.

3 As at December 31, 2020, the Group provided investments in Korea Software Financial Cooperative amounting to ￦ 5,491 million (2019: ￦ 1,849 million) as a collateral for the payment guarantee provided by the Cooperative.

Details of financial assets at fair value through profit or loss as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	232		￦	46,449
Equity Instruments (Unlisted)		90,357			83,017
Debt securities		541,657			680,453
Derivatives held for trading		78			—
Total		632,324			809,919
Less: non-current		(219,026	)		(276,109	)
Current	￦	413,298		￦	533,810

F-45

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The maximum exposure of debt instruments of financial assets recognized at fair value through profit or loss to credit risk is the carrying amount as at December 31, 2020.

Details of financial assets at fair value through other comprehensive income as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	6,738		￦	6,216
Equity Instruments (Unlisted)		543,518			245,730
Debt securities		7,086			6,570
Total		557,342			258,516
Less: non-current		(556,147	)		(258,516	)
Current	￦	1,195		￦	—

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.

In 2020, the Group disposed shares of Mastercard Inc. amounting to ￦ 350,777 million at fair value. Upon disposal, ￦ 265,087 million is reclassified as accumulated other comprehensive income after tax and ￦ 184,330 million is reclassified as retained earnings of attributable to owners of the controlling company.

Derivatives used for hedging as at December 31, 2019 and 2020, are as follows:

	December 31, 2019						December 31, 2020
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	1,464		￦	—		￦	1,078
Currency swap2		55,569			18,632			7,684			126,189
Currency forwards3		3,007			—			—			662
Total		58,576			20,096			7,684			127,929
Less: non-current		(28,304	)		(19,177	)		(2,111	)		(126,408	)
Current	￦	30,272		￦	919		￦	5,573		￦	1,521

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the borrowings.

2 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings. 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-46

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The valuation gains and losses on the derivatives contracts for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018						2019						2020
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	￦	192	￦	—	￦	(488)	￦	—	￦	45	￦	(963)	￦	—	￦	—	￦	(567)
Currency swap		58,912		2,045		22,139		72,417		15,784		87,626		—		161,661		(113,175	)
Currency forwards		7,201		—		—		4,858		—		4,858		—		2,049		—
Total	￦	66,305	￦	2,045	￦	21,651	￦	77,275	￦	15,829	￦	91,521	￦	—	￦	163,710	￦	(113,742)

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 loss of ￦ 2,711 million for the current period (2018: valuation gain of ￦ 263 million, 2019: valuation gain of ￦ 4,181 million).

The unsettled amount of derivative instruments for the years ended December 31, 2020 and 2019, are as follows:

(i) Hedging instruments

(In millions of Korean won and thousands of foreign currencies)	2019
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,574,068	￦	1,788,831	￦	30,175	￦	10,692	￦	49,480
JPY		80,000,000		827,292		28,401		9,404		15,396
Total			￦	2,616,123	￦	58,576	￦	20,096	￦	64,876

(In millions of Korean won and thousands of foreign currencies)	2020
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,768,912	￦	2,037,568	￦	2,111	￦	100,623	￦	(136,852	)
JPY		46,000,000		488,924		5,573		13,839		(4,065	)
SGD		284,000		245,208		—		13,467		(13,611	)
Total			￦	2,771,700	￦	7,684	￦	127,929	￦	(154,528	)

F-47

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(ii) Hedged item

(In millions of Korean won)
	2019								2020
Currency	Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges			Cash flow hedge reserves1			Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges		Cash flow hedge reserves1
USD	￦	1,822,477	￦	(45,855	)	￦	(5,214	)	￦	1,924,576	￦	133,978	￦	19,641
JPY		850,776		(14,841	)		(2,395	)		484,960		4,228		(2,569	)
SGD		—		—			—			233,510		13,611		2,707
Total	￦	2,673,253	￦	(60,696	)	￦	(7,609	)	￦	2,643,046	￦	151,817	￦	19,779

1 The amounts after adjustments of deferred income tax directly reflected in equity.

Details of financial liabilities at fair value through profit or loss as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	38	￦	45
Conversion Rights and Redemption Rights		—		2,637
Total	￦	38	￦	2,682

The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018				2019				2020
(In millions of Korean won)	Valuation gain		Valuation loss		Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	2,707	￦	78	￦	2,014	￦	10	￦	53
Conversion Rights and Redemption Rights		—		—		—		—		162		—
Total	￦	—	￦	2,707	￦	78	￦	2,014	￦	172	￦	53

8. Inventories

Inventories as at December 31, 2019 and 2020, are as follows:

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	805,691	￦	(144,438	)	￦	661,253	￦	650,856	￦	(133,224	)	￦	517,632
Others		130,424		—			130,424		17,004		—			17,004
Total	￦	936,115	￦	(144,438	)	￦	791,677	￦	667,860	￦	(133,224	)	￦	534,636

Cost of inventories recognized as expenses for year ended December 31, 2020, amounts to ￦ 3,938,842 million (2018: ￦ 3,926,199 million, 2019: ￦ 3,905,630 million) and reversal of valuation loss on inventory recognized amounts to ￦ 11,214 million for year ended December 31, 2020 (2018: valuation loss on inventory amounts to ￦ 55,288 million, 2019: valuation loss on inventory amounts to ￦ 30,857 million,).

F-48

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

9. Other Assets and Liabilities

Other assets and liabilities as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other assets
Advance payments	￦	179,475		￦	168,302
Prepaid expenses		84,768			66,578
Contract cost1		1,849,243			1,804,948
Contract assets1		557,041			586,438
Others		14,243			18,747
Less: Non-current		(685,488	)		(768,661	)
Current	￦	1,999,282		￦	1,876,352
Other liabilities
Advances received1	￦	333,342		￦	328,491
Withholdings		99,844			105,415
Unearned revenue1		65,228			29,593
Lease liabilities		1,211,352			1,143,640
Contract liabilities1		365,610			384,133
Others		23,298			21,597
Less: Non-current		(1,030,117	)		(909,570	)
Current	￦	1,068,557		￦	1,103,299

1 The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

10. Assets Held for Sale

For the year ended December 31, 2020, the Group decided to sell certain real estate and classified it as assets held for sale. Details of assets held for sale are as follows:

(In millions of Korean won)	Amount
Land	￦	172
Buildings and Other		1,026
Total	￦	1,198

Consideration for sale is expected to exceed the carrying amount of net assets, and as a result, no impairment was recognized for the segment classified as held for sale.

During the prior period, the Group decided to sell some real estate, in which the amount of ￦ 82,865 million was classified as assets held for sale and was sold in the current year.

F-49

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

11. Property and Equipment

Changes in property and equipment for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
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	)
Beginning, net		1,281,187			2,007,685			8,475,016			478,381			825,988			13,068,257
Changes in accounting policy1		—			(149	)		(12,947	)		(196,932	)		—			(210,028	)
Acquisition and capital expenditure		338			4,523			205,359			64,072			3,419,136			3,693,428
Disposal and termination		(1,352	)		(4,213	)		(76,457	)		(4,109	)		(1,362	)		(87,493	)
Depreciation		—			(134,350	)		(2,278,286	)		(89,940	)		—			(2,502,576	)
Impairment		—			(32	)		(41,450	)		(1,751	)		(27	)		(43,260	)
Transfer in (out)		126,066			270,980			2,742,671			16,218			(3,217,044	)		(61,109	)
Transfer to investment properties		(33,254	)		(8,081	)		—			—			—			(41,335	)
Transfer to assets held-for-sale		(89,330	)		(1,121	)		—			—			—			(90,451	)
Others		(21,474	)		26,822			79,345			1,596			(26,423	)		59,866
Ending, net	￦	1,262,181		￦	2,162,064		￦	9,093,251		￦	267,535		￦	1,000,268		￦	13,785,299
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)

1 With the application of IFRS 16, property and equipment were reclassified to right-of-use assets.

	2020
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)
Beginning, net		1,262,181			2,162,064			9,093,251			267,535			1,000,268			13,785,299
Acquisition and capital expenditure		25,156			7,249			112,085			47,669			2,959,690			3,151,849
Disposal and termination		(1,756	)		(3,367	)		(69,401	)		(3,385	)		(1,027	)		(78,936	)
Depreciation		—			(135,646	)		(2,343,965	)		(91,164	)		—			(2,570,775	)
Impairment		—			(36	)		(35,271	)		(44,468	)		—			(79,775	)
Transfer in (out)		53,238			283,937			2,489,138			28,024			(2,899,197	)		(44,860	)
Transfer to investment properties		6,792			(8,848	)		—			—			—			(2,056	)
Changes in scope of consolidation		56			494			225			43			—			818
Others		(11,040	)		2,175			68,921			1,398			(16,899	)		44,555
Ending, net	￦	1,334,627		￦	2,308,022		￦	9,314,983		￦	205,652		￦	1,042,835		￦	14,206,119
Acquisition cost	￦	1,334,759		￦	4,402,691		￦	39,182,265		￦	1,619,822		￦	1,046,795	￦		47,586,332
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(2,094,669	)		(29,867,282	)		(1,414,170	)		(3,960	)		(33,380,213	)

F-50

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Details of property and equipment provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	17,097	￦	18,705		Borrowings	￦	4,347	Industrial Bank of Korea, Korea Development Bank , K Bank, Inc.
Others	￦	45,851	￦	41,681		Borrowings	￦	3,473	Shinhan Bank

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	11,644	￦	15,502		Borrowings	￦	3,072	Industrial Bank of Korea, Korea Development Bank
	￦	4,142	￦	249		Deposits	￦	249	K Bank, Inc.

The borrowing costs capitalized for qualifying assets amount to ￦ 8,452 million (2019: ￦ 6,360) in 2020. The interest rate applied to calculate the capitalized borrowing costs in 2020 is 2.36% (2019: 2.63%).

F-51

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

12. Investment Properties

Changes in investment properties for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	350,417		￦	1,168,379		￦	121	￦	1,518,917
Less: Accumulated depreciation		(1,569	)		(426,264	)		—		(427,833	)
Beginning, net	￦	348,848		￦	742,115		￦	121	￦	1,091,084
Changes in accounting policy 1		—			46,666			—		46,666
Acquisition		148,511			103,774			1,781		254,066
Disposal and termination		(285	)		(1,408	)		—		(1,693	)
Depreciation		—			(65,178	)		—		(65,178	)
Transfer from property and equipment		33,254			8,081			—		41,335
Transfer and others		23,268			(2,118	)		—		21,150
Ending, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(491,586	)		—		(493,154	)

1 With the application of IFRS 16, right-of-use-assets were partially reclassified to investment properties.

(In millions of Korean won)	2020
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation		(1,568	)		(491,586	)		—		(493,154	)
Beginning, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition		11,723			7,096			34,243		53,062
Disposal and termination		(1,536	)		(243	)		—		(1,779	)
Depreciation		—			(64,531	)		—		(64,531	)
Transfer from property and equipment		(6,792	)		8,848			—		2,056
Transfer and others		(18,656	)		469			10,402		(7,785	)
Ending, net	￦	538,335		￦	783,571		￦	46,547	￦	1,368,453
Acquisition cost	￦	539,903		￦	1,341,326		￦	46,547	￦	1,927,776
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(557,755	)		—		(559,323	)

The fair value of investment properties is ￦ 2,645,482 million as at December 31, 2020 (December 31, 2019: ￦ 2,304,583 million). The fair value of investment properties is estimated based on the expected cash flow.

F-52

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Rental income from investment properties is ￦ 203,763 million in 2020 (2019: ￦ 198,636 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.

As at December 31, 2020, the Group (Lessor) has entered into a non-cancellable operating lease contract relating to real estate lease. The future minimum lease fee under this contract is ￦ 50,769 million for one year or less, ￦ 92,728 million more than one year and less than five years, ￦ 78,435 million over five years, and ￦ 221,932 million in total.

Details of investment properties provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	854,874	￦	62,896	Deposits	￦	56,831
Land and Buildings	￦	1,915	￦	3,044	Borrowings	￦	1,903

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	790,414	￦	62,968	Deposits	￦	56,247
Land and Buildings	￦	2,861	￦	3,434	Borrowings	￦	2,928

13. Intangible Assets

Changes in intangible assets for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
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	)		(739,769	)		(4,657,146	)
Beginning, net	￦	236,058		￦	335,110		￦	65,944		￦	2,156,500		￦	513,512		￦	3,407,124
Changes in accounting policy 1		—			—			—			—			(26,207	)		(26,207	)
Acquisition and capital expenditure		—			47,903			30,965			—			99,826			178,694
Disposal and termination		—			(3,019	)		(1,267	)		(284	)		(11,109	)		(15,679	)
Amortization		—			(115,839	)		(68,222	)		(399,382	)		(77,262	)		(660,705	)
Impairment		(605	)		(1,333	)		(1,807	)		(3,035	)		(55,118	)		(61,898	)
Others		117			9,812			11,768			142			(9,131	)		12,708
Ending, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)

1 With the application of IFRS 16, intangible assets were reclassified to right-of-use assets.

F-53

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	2020
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others1			Total
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)
Beginning, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition and capital expenditure		—			26,990			37,077			—			101,563			165,630
Disposal and termination		—			(1,849	)		(105	)		—			(11,866	)		(13,820	)
Amortization		—			(104,938	)		(54,191	)		(399,348	)		(69,677	)		(628,154	)
Impairment		—			—			(1,776	)		(193,194	)		(16,667	)		(211,637	)
Changes in scope of consolidation		—			575			77			—			3,690			4,342
Others		(5,485	)		87,587			27,537			(736	)		(98,043	)		10,860
Ending, net	￦	230,085		￦	280,999		￦	146,000		￦	1,160,663		￦	343,511		￦	2,161,258
Acquisition cost		536,093			1,767,422			1,053,980			3,373,095			1,167,735			7,898,325
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,008	)		(1,486,423	)		(907,980	)		(2,212,432	)		(824,224	)		(5,737,067	)

1 The carrying amount of membership rights and others, excluding goodwill, with indefinite useful life not subject to amortization is ￦ 221,099 million (2019: ￦ 203,240 million) as at December 31, 2020.

Due to the change in its business environment, the Group expects that it is no longer probable that its 28GHz frequency usage rights will be in the condition necessary for it to be capable of operating in the manner intended by management. As a result, the Group recognized an impairment loss of ￦ 190,929 million as the carrying amount of the 28GHz frequency usage right for the Controlling Company’s wireless business (acquisition cost: ￦ 201,461 million) exceeded the recoverable amount during the current period, and was recognized as operating expenses in the consolidated statement of profit or loss. The recoverable amount was calculated based on the value of use. Value of use was calculated by discounting the future cashflow that considers the remaining useful life (3 years) of frequency usage rights.

In relation to KT Skylife TV Co., Ltd., the Group recognized impairment loss of ￦ 38,519 million in Others as at December 31, 2019 as the carrying amount of cash-generating units exceeded its recoverable amount, and recognized operating expenses in the consolidated statements of operations during the prior period. The recoverable amount is based on fair value less value in use or disposal costs, and the discount rate applied in computing the recoverable amount is 7.3%. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate (-)1.25% based on past performance and its expectation of future market changes. During the current year, KT Skylife Co., Ltd. did not recognize an impairment loss for indefinite useful life intangible assets.

F-54

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As at December 31, 2020, goodwill allocated to each cash-generating unit is as follows:

(In millions of Korean won)
Operating Segment	Cash generating Unit	Amount
ICT6	Mobile services1	￦	65,057
Finance	BC Card Co., Ltd.2		41,234
Others	GENIE Music Corporation (KT Music Corporation) 3		50,214
	PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) 4		42,745
	KT Telecop Co., Ltd. 5		15,418
	KT MOS Bukbu Co., Ltd and others		15,417
	Total	￦	230,085

1 The recoverable amounts of mobile services business are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% 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 7.43% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2018, 2019 and 2020.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.92% 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 7.75% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on fair value less cost to sell.

4 The recoverable amount of PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) is calculated based on fair value less cost to sell.

5 The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.30% based on past performance and its expectation of future market

F-55

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 9.78% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

6 The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% ~ 4.93% 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 rate 7.43%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2018, 2019 and 2020.

14. Investments in Associates and Joint Ventures

Details of associates as at December 31, 2019 and 2020, are as follows:

	Percentage of ownership (%)						Location		Closing month
	2019			2020
Korea Information & Technology Fund		33.3	%		33.3	%		Korea		December 31, 2019, December 31, 2020
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%		Korea		December 31, 2019, December 31, 2020
KT-CKP New Media Investment Fund		49.7	%		—			Korea		December 31, 2019, December 31, 2020
K Bank Inc.		10.0	%		34.0	%		Korea		December 31, 2019, December 31, 2020
Hyundai Robotics Co., Ltd.2		—			10.0	%		Korea		December 31, 2019, December 31, 2020

1 At the end of the reporting period, although the Group owns 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, because the Group cannot participate in determining the operating and financial policies.

2 At the end of the reporting period, although the Group has less than 20% ownership in ordinary share, this entity is included in investments in associates as the Group has a significant influence in determining the operating and financial policies.

F-56

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Changes in investments in associates and joint ventures for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	148,255	￦	—		￦	17,956		￦	(2,236	)	￦	163,975
KT-SB Venture Investment Fund		4,470		(4,470	)		—			—			—
KT-IBKC Future Investment Fund 1		9,961		3,750			389			—			14,100
KT-CKP New Media Investment Fund		281		(174	)		27			—			134
K Bank Inc.		52,655		21,782			(28,865	)		(414	)		45,158
Others1		56,785		(7,867	)		7,241			(11,866	)		44,293
	￦	272,407	￦	13,021		￦	(3,252	)	￦	(14,516	)	￦	267,660

	2020
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	163,975	￦	—		￦	12,205		￦	(6,025	)	￦	170,155
KT-IBKC Future Investment Fund 1		14,100		—			2,090			—			16,190
KT-CKP New Media Investment Fund		134		(134	)		—			—			—
K Bank Inc.		45,158		195,011			(30,209	)		(1,688	)		208,272
Hyundai Robotics Co., Ltd.		—		50,000			(64	)		1,000			50,936
Others1		44,293		28,400			34,298			5,337			112,328
	￦	267,660	￦	273,277		￦	18,320		￦	(1,376	)	￦	557,881

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 gain from associates and joint ventures of ￦ 279 million (2018: net loss of ￦ 445 million, 2019: net gain of ￦ 52 million) recognized as operating revenue during the period.

F-57

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	113,233	￦	378,691	￦	—	￦	—
KT-IBKC Future Investment Fund 1		28,200		—		—		—
KT-CKP New Media Investment Fund		3		267		—		—
K Bank Inc.		2,480,065		78,566		2,350,375		3,784

(In millions of Korean won)	December 31, 2020
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	107,652	￦	402,812	￦	—	￦	—
KT-IBKC Future Investment Fund 1		32,379		—		—		—
K Bank Inc.		4,255,620		74,193		3,752,838		88,155
Hyundai Robotics Co., Ltd.		315,886		125,619		80,615		59,324

(In millions of Korean won)	2019
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	70,577	￦	53,867		￦	6,132		￦	59,999		￦	4,280
KT-IBKC Future Investment Fund 1		1,694		779			—			779			—
KT-CKP New Media Investment Fund		56		55			—			55			—
K Bank Inc.		92,720		(100,773	)		(23	)		(100,796	)		—

(In millions of Korean won)	2020
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	54,473	￦	36,615		￦	9,647		￦	46,262		￦	9,241
KT-IBKC Future Investment Fund 1		6,551		4,179			—			4,179			—
K Bank Inc.		80,301		(105,374	)		(1,126	)		(106,500	)		—
Hyundai Robotics Co., Ltd.		195,311		(642	)		11,573			10,931			—

F-58

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	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	￦	491,924		33.30	%	￦	163,975	￦	—	￦	163,975
KT-IBKC Future Investment Fund 1		28,200		50.00	%		14,100		—		14,100
KT-CKP New Media Investment Fund		270		49.70	%		134		—		134
K Bank Inc.1		204,472		10.00	%		45,158		—		45,158

1 12.1% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

(In millions of Korean won)	December 31, 2020
	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	￦	510,464		33.30	%	￦	170,155	￦	—	￦	170,155
KT-IBKC Future Investment Fund 1		32,379		50.00	%		16,190		—		16,190
K Bank Inc.1		488,819		34.00	%		166,198		42,074		208,272
Hyundai Robotics Co., Ltd.		301,566		10.00	%		30,157		20,779		50,936

1 12.1% 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 ￦ 992 million for the year ended December 31, 2020 (for the year ended December 31, 2019: ￦ 6,124 million). The accumulated comprehensive loss of associates and joint ventures as at December 31, 2020, which was not recognized by the Group is ￦ 8,228 million (as at December 31, 2019: ￦ 12,599 million).

F-59

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

15. Trade and Other Payables

Details of trade and other payables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Current liabilities
Trade payables	￦	1,304,795	￦	1,239,717
Other payables		6,292,683		4,970,382
Total	￦	7,597,478	￦	6,210,099
Non-current liabilities
Trade payables	￦	1,733	￦	1,528
Other payables		1,080,487		806,012
Total	￦	1,082,220	￦	807,540

Details of other payables as at December 31, 2019 and 2020 are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Non-trade payables1	￦	5,275,224		￦	3,841,227
Accrued expenses		987,624			933,978
Operating deposits		910,045			803,904
Others		200,277			197,285
Less: non-current		(1,080,487	)		(806,012	)
Current	￦	6,292,683		￦	4,970,382

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 1,007,171 million related to credit card transactions are included as at December 31, 2020 (2019: ￦ 1,824,068 million).

F-60

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

16. Borrowings

Details of borrowings as at December 31, 2019 and 2020, are as follows:

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019					December 31, 2020
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 7, 2034	6.50%		USD 100,000	￦	115,780			USD 100,000	￦	108,800
MTNP notes		July 18, 2026	2.50%		USD 400,000		463,120			USD 400,000		435,200
MTNP notes		Aug. 7, 2022	2.63%		USD 400,000		463,120			USD 400,000		435,200
FR notes		Aug. 20, 2020	—		USD 200,000		231,560			—		—
FR notes2		Aug. 20, 2023	LIBOR(3M)+0.900%		USD 100,000		115,780			USD 100,000		108,800
MTNP notes		July 6, 2020	—		JPY 4,000,000		42,539			—		—
MTNP notes		July 6, 2021	0.38%		JPY 16,000,000		170,155			JPY 16,000,000		168,682
MTNP notes		Nov. 13, 2020	—		JPY 30,000,000		319,041			—		—
MTNP notes		July 19, 2022	0.22%		JPY 29,600,000		314,787			JPY 29,600,000		312,061
MTNP notes		July 19, 2024	0.33%		JPY 400,000		4,254			JPY 400,000		4,217
FR notes2		Nov. 1, 2024	LIBOR(3M)+0.980%		USD 350,000		405,230			USD 350,000		380,800
FR notes2		June 19, 2023	SOR(6M)+0.500%		—		—			SGD 284,000		233,510
MTNP notes		Sept. 1, 2025	1.00%		—		—			USD 400,000		435,200
The 180-2rd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
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 184-2nd 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 185-2nd Public bond		Sept. 16, 2020	—		—		300,000			—		—
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2024	3.70%		—		100,000			—		100,000
The 187-3rd Public bond		Sept. 2, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 2, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	—		—		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 189-2nd 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			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		150,000			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		170,000			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		70,000			—		70,000
The 191-1st Public bond		Jan. 14, 2022	2.05%		—		220,000			—		220,000
The 191-2nd Public bond		Jan. 15, 2024	2.09%		—		80,000			—		80,000
The 191-3rd Public bond		Jan. 15, 2029	2.16%		—		110,000			—		110,000
The 191-4th Public bond		Jan. 14, 2039	2.21%		—		90,000			—		90,000
The 192-1st Public bond		Oct. 11, 2022	1.55%		—		340,000			—		340,000
The 192-2nd Public bond		Oct. 11, 2024	1.58%		—		100,000			—		100,000
The 192-3rd Public bond		Oct. 11, 2029	1.62%		—		50,000			—		50,000
The 192-4th Public bond		Oct. 11, 2039	1.67%		—		110,000			—		110,000
The 193-1st Public bond		June 16, 2023	1.17%		—		—			—		150,000
The 193-2nd Public bond		June 17, 2025	1.43%		—		—			—		70,000
The 193-3rd Public bond		June 17, 2030	1.61%		—		—			—		20,000
The 193-4th Public bond		June 15, 2040	1.71%		—		—			—		60,000
The 148th Won-denominated unsecured bond		June 23, 2023	1.51%		—		—			—		100,000
Subtotal							7,045,366					6,962,470
Less: Current portion							(1,052,032	)				(1,228,283	)
Discount on bonds							(20,780	)				(19,847	)
Total						￦	5,972,554				￦	5,714,340

F-61

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

1 As at December 31, 2020, 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) and SOR (6M) are approximately 0.238% and 0.185%, respectively as at December 31, 2020.

Convertible bonds

(In millions of Korean won and thousands of foreign currencies)

December 31, 2019

Type

Issuance date

Maturity

Annual interest rate

December 31, 2019

December 31, 2020

The 1st CB(Private)1,2

Jun. 5, 2020

Jun. 5, 2025

0.00

%

￦

—

￦

8,000

Redemption premium

—

2,267

Bond discount issuance

—

(4,644

)

Subtotal

￦

—

￦

5,623

Current portion

￦

—

￦

—

Total

￦

—

￦

5,623

1 Common shares of Storywiz are subject to conversion (appraisal period: June 5, 2021~ May 4, 2025).

2 Nominal interest rate and maturity yield is approximately 0% and 5% and will be settled on maturity

Short-term borrowings

(In millions of Korean won)			December 31, 2019		December 31, 2020
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	1.740% ~ 2.360%	￦	15,000	￦	40,189
	Shinhan Bank	2.460% ~ 2.960%		57,500		22,500
	Shinhan Bank	CD91+1.431%		—		10,000
	Woori Bank	3.57%		—		1,900
	Korea Development Bank	3.34%		10,000		10,000
	SooHyup Bank	—		1,000		—
	Industrial Bank of Korea	1.74%		—		200
	Hana Bank	4.20%		—		11,000
	Total		￦	83,500	￦	95,789

F-62

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019				December 31, 2020
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%		—	￦	3,454		—	￦	2,961
Industrial Bank of Korea	General loans		2.98%		—		6,000		—		6,000
Shinhan Bank	General loans		1.94%		—		5,000		—		5,000
	Facility loans2		LIBOR(3M)+1.340%		USD 25,918		30,008		USD 25,918		28,199
	General loans2		LIBOR(3M)+1.650%		USD 3,000		3,473		USD 8,910		9,694
	General loans2		LIBOR(3M)+2.130%		—		—		USD 25,000		27,200
CA-CIB	Long-term CP		1.26%		—		—		—		100,000
NongHyup Bank	Facility loans		2.00%		—		79		—		54
Korea Development Bank	General loans		3.02%		—		10,000		—		10,000
	General loans		3.31%		—		30,000		—		30,000
Others	Kookmin Bank and other2		LIBOR(3M)+1.850%		USD 87,940		101,816		USD 48,855		53,155
			—		—		950		—		—
Subtotal						￦	190,780			￦	272,263
Less: Current portion						￦	(50,192)			￦	(94,042)
Total						￦	140,588			￦	178,221

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 0.238% as at December 31, 2020.

Repayment schedule of the Group’s borrowings including the portion of current liabilities as at December 31, 2020 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, 2021 ~ Dec 31, 2021	￦	1,060,000	￦	168,682	￦	1,228,682	￦	147,307	￦	42,524	￦	189,831	￦	1,418,513
Jan 1, 2022 ~ Dec 31, 2022		560,000		747,261		1,307,261		518		38,830		39,348		1,346,609
Jan 1, 2023 ~ Dec 31, 2023		590,000		342,310		932,310		100,500		36,894		137,394		1,069,704
Jan 1, 2024 ~ Dec 31, 2024		460,000		385,017		845,017		493		—		493		845,510
After Jan. 1, 2025		1,678,000		979,200		2,657,200		986		—		986		2,658,186
	￦	4,348,000	￦	2,622,470	￦	6,970,470	￦	249,804	￦	118,248	￦	368,052	￦	7,338,522

F-63

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

17. Provisions

Changes in provisions for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Increase (Transfer)		42,684			6,591			17,328			66,603
Usage		(35,640	)		(5,394	)		(15,851	)		(56,885	)
Reversal		(1,563	)		(6,736	)		(29,133	)		(37,432	)
Ending balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Current	￦	64,241		￦	37,906		￦	73,465		￦	175,612
Non-current		—			75,383			3,167			78,550
	2020
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Increase (Transfer)		17,064			(1,933	)		17,873			33,004
Usage		(3,948	)		(2,990	)		(2,266	)		(9,204	)
Reversal		(857	)		(3,023	)		(23,212	)		(27,092	)
Changes in scope of consolidation		—			424			898			1,322
Ending balance	￦	76,500		￦	105,767		￦	69,925		￦	252,192
Current	￦	76,500		￦	22,343		￦	67,147		￦	165,990
Non-current		—			83,424			2,778			86,202

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, 2019			December 31, 2020
Present value of defined benefit obligations	￦	2,427,351		￦	2,556,712
Fair value of plan assets		(2,069,710	)		(2,189,375	)
Liabilities	￦	365,663		￦	378,087
Assets in the statement of financial position	￦	8,022		￦	10,750

F-64

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Changes in the defined benefit obligations for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	2,201,876		￦	2,427,351
Current service cost		243,598			248,047
Interest expense		47,403			45,083
Benefit paid		(100,663	)		(258,866	)
Changes due to settlements of plan		910			1,075
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		39			5,191
Actuarial gains and losses arising from changes in financial assumptions		11,773			17,077
Actuarial gains and losses arising from experience adjustments		19,465			57,703
Changes in scope of consolidation		2,950			14,051
Ending	￦	2,427,351		￦	2,556,712

Changes in the fair value of plan assets for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	1,643,046		￦	2,069,710
Interest income		35,386			38,590
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(2,537	)		2,589
Benefits paid		(87,119	)		(213,953	)
Employer contributions		476,916			284,243
Changes in scope of consolidation		4,018			8,196
Ending	￦	2,069,710		￦	2,189,375

Amounts recognized in the ‘Operating expenses’ of the consolidated statements of operations for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Current service cost	￦	225,667		￦	243,598		￦	248,047
Net Interest cost		10,458			12,017			6,494
Past service cost		9,801			910			1,075
Transfer out		(13,881	)		(16,215	)		(16,514	)
Total expenses	￦	232,045		￦	240,310		￦	239,102

Principal actuarial assumptions used are as follows:

	December 31, 2018			December 31, 2019			December 31, 2020
Discount rate		2.32	%		1.97	%		1.93	%
Future salary increase		5.08	%		4.92	%		4.88	%

F-65

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The sensitivity of the defined benefit obligations as at December 31, 2020, 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		￦ (86,288)	￦	93,254
Salary growth rate	0.5% point		85,344		(79,970	)

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, 2021, are ￦ 355,481 million.

The expected maturity analysis of undiscounted pension benefits as at December 31, 2020, 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	￦	232,550	￦	271,366	￦	794,840	￦	2,284,517	￦	3,583,273

The weighted average duration of the defined benefit obligations is 6.7 years.

19. Defined Contribution Plan

Recognized expense related to the defined contribution plan for the year ended December 31, 2020, is ￦ 61,912 million (2018: ￦ 48,210 million, 2019: ￦ 57,170 million).

F-66

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

20. Commitments and Contingencies

As at December 31, 2020, 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		1,502,000		—
Inter-Korean Cooperation Fund	Export-Import Bank of Korea	KRW		37,700		2,714
Insurance for Economic Cooperation project	Export-Import Bank of Korea	KRW		3,240		1,732
Collateralized loan on electronic accounts receivable-trade	Kookmin Bank and others	KRW		522,849		23,475
Plus electronic notes payable	Industrial Bank of Korea	KRW		50,000		331
Loans for working capital	Korea Development Bank and others	KRW		243,593		152,243
Facility loans	Shinhan Bank and others	KRW		100,123		55
	Kookmin Bank and others	USD		212,000		48,855
Derivatives transaction limit	Korea Development Bank	KRW		100,000		22,027
	Woori Bank and others	USD		69,054		44,616
Total		KRW		2,559,505		202,577
		USD		281,054		93,471

As at December 31, 2020, 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		208,386
Performance guarantee	Korea Development Bank and others		USD		8,569
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD		5,000
Guarantee for payment in won currency	Shinhan Bank and others		KRW		70,962
Refund guarantee for advances received	Korea Development Bank		USD		8,536
Guarantee for payment in foreign currency	KEB Hana Bank and others		USD		40,840
Comprehensive credit line	KEB Hana Bank and others		KRW		41,100
Comprehensive credit line	KEB Hana Bank and others		USD		8,700
Bid guarantee	KEB Hana Bank		USD		400
Bid guarantee	Korea Software Financial Cooperative and others		KRW		80,246
Performance guarantee /warranty guarantee			KRW		393,019
Guarantee for advance payments/others			KRW		388,656
Warranty guarantee	Seoul Guarantee Insurance		KRW		1,305
Performance guarantee			KRW		9,690
Guarantees for licensing			KRW		7,748
Guarantees for depositions			KRW		3,792
Merchant business guarantee insurance			KRW		237
Total			KRW		1,205,141
			USD		72,045

F-67

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

As at December 31, 2020, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won)	Subject to payment guarantees	Creditor	Limit		Used amount		Period
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Gasan Solar Power Plant Inc.	Shinhan Bank		4,700		1,371		Jan. 08, 2025
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	SPP Inc.	Suhyup Bank		3,250		932		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Korea Cell Inc.	Suhyup Bank		3,250		880		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	San-Ya Agricultural Association Corporation	Suhyup Bank		3,250		888		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Ciocanesti Korea Co., Ltd.	NH Investment & Securities Co.,Ltd.		7,600		7,600		Jun. 8, 2017
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		700		—		Apr. 17, 2020 ~ Apr. 16, 2021
Nasmedia Co., Ltd.	Stockholders Association Members	Korea Securities Finance Corp		5,654		2,735		—

1 According to the above payment guarantee, KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.), a subsidiary of the Group, will have an obligation of repayment if the principal borrower does not repay the borrowing.

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, 2020, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ￦ 1,618 million.

For the years ended December 31, 2019 and 2020, the Group made agreements with the Securitization Specialty Companies (2020: First 5G 49^th to 54^th Securitization Specialty Co., Ltd., 2019: First 5G 43^rd to 48^th Securitization Specialty Co., Ltd., 2018: Giga LTE Thirty seventh to Forty second 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, 2020, the Group is a defendant in 195 lawsuits with the total claimed amount of ￦ 110,409 million (2019: ￦ 214,877 million). As at December 31, 2020, litigation provisions of ￦ 76,500 million (2019: ￦ 62,241 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 as at December 31, 2020.

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.

As at December 31, 2020, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants.

As at December 31, 2020, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦ 596,983 million (2019: ￦ 851,798 million).

F-68

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

21. Leases

Information on leases when the Group is a lessee is as follows: Information on leases when the Group is a lessor is provided in Note 12.

(i) Amounts recognized in the consolidated statement of financial position

The consolidated statement of financial position shows the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Right-of-use assets
Property and building	￦	1,020,619	￦	1,073,207
Machinery and track facilities		140,296		42,127
Others		107,414		101,845
Total	￦	1,268,329	￦	1,217,179
Investment property (buildings)		50,010		19,456
(In millions of Korean won)	December 31, 2019		December 31, 2020
Lease liabilities1
Current	￦	392,433	￦	345,224
Non-Current		818,919		798,416
Total	￦	1,211,352	￦	1,143,640

1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statement of financial position (Notes 9 and 41).

For the year ended December 31, 2020, right-of-use assets has increased for ￦ 404,293 million for lease contracts.

(ii) Amounts recognized in the consolidated statements of profit or loss

The consolidated statements of profit or loss show the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Depreciation of Right-of-use assets
Property and building	￦	300,773	￦	290,168
Machinery and track facilities		89,452		58,419
Others		52,402		55,588
Total	￦	442,627	￦	404,175
Depreciation of Investment Properties	￦	21,809	￦	19,113
Interest expense relating to lease liabilities		55,001		44,091
Expense relating to short-term leases		14,718		10,998
Expense relating to leases of low-value assets that are not short-term leases		26,575		25,894
Expense relating to variable lease payments not included in lease liabilities		5,993		8,096

F-69

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The total cash outflow for leases for December 31, 2020, was ￦ 492,772 million (2019: ￦ 532,730 million).

22. Share Capital

As at December 31, 2019 and 2020, the Group’s number of authorized shares is one billion.

December 31, 2019

December 31, 2020

Number of issued shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of issued 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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		6,157,305		6,721,809
Total	￦	11,590,916	￦	12,155,420

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.

24. Accumulated Other Comprehensive Income and Other Components of Equity

As at December 31, 2019 and 2020, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Changes in investments in associates and joint ventures	￦	1,556		￦	16,257
Loss on derivatives valuation		(7,624	)		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			61,438
Exchange differences on translation for foreign operations		(10,571	)		(11,453	)
Total	￦	194,934		￦	86,051

F-70

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Changes in accumulated other comprehensive income for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning			Increase/ decrease		Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(871	)	￦	2,427	￦	—		￦	1,556
Gain or loss on derivatives valuation		(30,474	)		67,534		(44,684	)		(7,624	)
Gain on valuation of financial assets at fair value through other comprehensive income		96,704			114,869		—			211,573
Exchange differences on translation for foreign operations		(15,201	)		4,630		—			(10,571	)
Total	￦	50,158		￦	189,460	￦	(44,684	)	￦	194,934

(In millions of Korean won)	2020
	Beginning			Increase/ decrease			Reclassification to gain or loss		Ending
Changes in investments in associates and joint ventures	￦	1,556		￦	14,701		￦	—	￦	16,257
Gain or loss on derivatives valuation		(7,624	)		(83,998	)		111,431		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			(150,135	)		—		61,438
Exchange differences on translation for foreign operations		(10,571	)		(882	)		—		(11,453	)
Total	￦	194,934			￦(220,314	)	￦	111,431	￦	86,051

The Group’s other components of equity as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Treasury stock1		￦(825,838)			￦(882,224)
Gain or loss on disposal of treasury stock2		1,229			(17,579	)
Share-based payments		7,769			5,901
Others3		(353,243	)		(340,882	)
Total		￦(1,170,083	)		￦(1,234,784	)

1 During the year ended December 31, 2020, the Group acquired 4,550,000 treasury shares and granted 1,150,580 treasury shares as share-based payment.

2 The amount directly reflected in equity is ￦7,288 million (2019: ￦603 million) for the year ended December 31, 2020.

3 Profit or loss incurred from transactions with non-controlling interest and investment difference incurred from change in proportion of subsidiaries are included.

F-71

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

As at December 31, 2019 and 2020, the details of treasury stock are as follows:

	December 31, 2019		December 31, 2020
Number of shares (in shares)		15,870,258		19,269,678
Amounts (In millions of Korean won)	￦	825,838	￦	882,224

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, 2020, are as follows:

(In share)	14th grant
Grant date	June 16, 2020
Grantee	CEOs, internal directors, external directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦22,700
Total compensation costs (in Korean won)	￦ 5,187 million
Estimated exercise date (exercise date)	During 2021
Valuation method	Fair value method

(In share)	Employee wage negotiation
Grant date	September 21, 2020
Grantee	All employees
Vesting conditions	Current employees as of September 21, 2020
Fair value per option (in Korean won)	￦22,950
Total compensation costs (in Korean won)	￦ 23,317 million
Estimated exercise date (exercise date)	December 22, 2020
Valuation method	Fair value method

Changes in the number of stock options and the weighted-average exercise price as at December 31, 2019 and 2020, are as follows:

	2019
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
12th grant		353,325		—		256,543		96,782		—		—
13th grant		—		372,023		—		—		372,023		—
Total		353,325		372,023		256,543		96,782		372,023		—

F-72

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	2020
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
13th grant		372,023		—		241,548		130,475		—		—
14th grant		—		398,856		—		—		398,856		—
Employee wage negotiation		—		1,020,105		—		1,020,105		—		—
Total		372,023		1,418,961		241,548		1,150,580		398,856		—

¹  The weighted average price of ordinary shares at the time of exercise in 2020 was ￦ 25,486 (2019: ￦ 27,482).

26. Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

The Group has recognized the following amounts relating to revenue in the Consolidated Statements of Operations:

(In millions of Korean won)	2018		2019		2020
Revenue from contracts with customers	￦	23,012,257	￦	24,441,122	￦	23,895,631
Revenue from other sources		423,793		458,067		545,016
Total revenue	￦	23,436,050	￦	24,899,189	￦	24,440,647

Operating revenues for the years ended December 31, 2018, 2019 and 2020 are as follows:

(In millions of Korean won)	2018		2019		2020
Mobile services	￦	6,827,685	￦	6,795,124	￦	6,805,218
Fixed-line services		4,869,253		4,866,698		4,827,015
Fixed-line and VoIP telephone services		1,708,319		1,578,546		1,463,553
Broadband Internet access services		2,112,763		2,177,447		2,256,188
Data communication services		1,048,171		1,110,705		1,107,274
Media and content		2,261,808		2,516,256		2,637,691
Financial services		3,444,917		3,641,655		3,493,920
Sale of goods		3,288,911		4,194,168		3,593,127
Others		2,743,476		2,885,288		3,083,676
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647

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 are considered a separate performance obligations. 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,

F-73

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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)	December 31, 2019		December 31, 2020
Contract assets1	￦	655,329	￦	672,672
Contract liabilities1		413,442		413,707
Deferred revenue2	￦	92,557	￦	89,694

1 The Group recognized contract assets of ￦ 86,234 million and contract liabilities of ￦29,574 million for long term construction contracts as at December 31, 2020 (2019: contract assets of ￦98,288 million and contract liabilities of ￦47,832 million). The Group recognizes contract assets as trade and other receivables, and contract liabilities as other current liabilities.

2 Deferred revenue recognized relating to government grant is excluded.

The contract costs recognized as assets are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Incremental cost of contract establishment	￦	1,764,009	￦	1,726,191
Cost of Contract performance		85,234		78,757

As at December 31, 2020, the Group recognized ￦ 1,831,638 million (2019: ￦ 1,681,039 million) of operating expenses related to contract cost assets.

The recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018		2019		2020
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905	￦	266,478	￦	251,975
Deferred revenue of joining/installment fee		39,975		44,032		42,685
Others		1,536		—		—
Total	￦	225,416	￦	310,510	￦	294,660

F-74

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

27. Operating Expenses

Operating expenses for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019		2020
Salaries and wages	￦	3,845,842		￦	3,974,233	￦	4,123,680
Depreciation		2,674,205			2,530,252		2,605,128
Depreciation of right-of-use assets		—			442,629		404,175
Amortization of intangible assets		607,527			656,611		624,982
Commissions		1,080,168			1,115,477		965,461
Interconnection charges		579,613			534,025		500,081
International interconnection fee		226,627			240,254		172,529
Purchase of inventories		4,414,094			4,453,820		3,681,801
Changes of inventories		(432,607	)		282,957		257,041
Sales commission		1,942,841			2,315,731		2,337,127
Service cost		1,540,869			1,610,261		2,102,875
Utilities		323,411			332,816		360,797
Taxes and dues		285,131			277,742		283,197
Rent		460,377			193,357		136,355
Insurance premium		73,654			82,404		71,018
Installation fee		143,669			155,178		132,117
Advertising expenses		157,675			150,166		132,466
Research and development expenses		176,758			165,028		156,940
Card service cost		3,112,618			3,066,766		2,941,669
Others		1,122,718			1,292,512		1,428,875
Total	￦	22,335,190		￦	23,872,219	￦	23,418,314

Details of salaries and wages for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Short-term employee benefits	￦	3,505,214	￦	3,663,337	￦	3,770,786
Post-employment benefits(Defined benefit plan)		232,045		240,310		239,102
Post-employment benefits(Defined contribution plan)		48,210		57,170		61,912
Share-based payment		8,439		6,398		28,604
Others		51,934		7,018		23,276
Total	￦	3,845,842	￦	3,974,233	￦	4,123,680

F-75

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

28. Financial Income and Costs

Details of financial income for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest income	￦	244,796	￦	282,704	￦	270,571
Gain on foreign currency transactions		17,175		24,596		17,493
Gain on foreign currency translation		3,691		17,979		164,351
Gain on settlement of derivatives		27,950		9,016		9,397
Gain on valuation of derivatives		66,305		77,353		172
Others		14,326		12,747		36,630
Total	￦	374,243	￦	424,395	￦	498,614

Details of financial costs for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest expenses	￦	296,874	￦	278,427	￦	263,579
Loss on foreign currency transactions		49,156		30,267		27,805
Loss on foreign currency translation		72,642		93,977		26,340
Loss on settlement of derivatives		—		20		1,406
Loss on valuation of derivatives		2,045		15,867		163,763
Loss on disposal of trade receivables		13,818		11,298		8,152
Others		1,124		2,277		16,338
Total	￦	435,659	￦	432,133	￦	507,383

29. Deferred Income Tax and income Tax Expense

The analysis of deferred tax assets and deferred tax liabilities as at December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	419,889		￦	404,434
Deferred tax assets to be recovered after more than 12 months		1,613,836			1,631,759
Deferred tax assets before offsetting		2,033,725			2,036,193
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(538,578	)		(637,317	)
Deferred tax liability to be recovered after more than 12 months		(1,495,759	)		(1,394,509	)
Deferred tax liabilities before offsetting		(2,034,337	)		(2,031,826	)
Deferred tax assets after offsetting	￦	424,856		￦	433,698
Deferred tax liabilities after offsetting	￦	425,468		￦	429,331

F-76

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The gross movements on the deferred income tax account for the years ended December 31, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	260,584		￦	(612	)
Changes to the statement of operations		(199,527	)		(72,124	)
Changes to other comprehensive loss (income)		(61,669	)		77,103
Ending	￦	(612	)	￦	4,367

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)	2019
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		—			(10,250	)		(648	)		(10,898	)
Investment in subsidiaries, associates, and joint ventures		(93,604	)		(14,622	)		35			(108,191	)
Depreciation		(424	)		(11,182	)		—			(11,606	)
Advanced depreciation provision		(313,184	)		63			—			(313,121	)
Deposits for severance benefits		(398,982	)		(99,126	)		1,255			(496,853	)
Accrued income		(1,558	)		17			—			(1,541	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(369,916	)		(40,947	)		—			(410,863	)
Contract assets		(11,505	)		(42,245	)		—			(53,750	)
Financial assets at fair value through profit or loss		(661	)		338			—			(323	)
Financial assets at fair value through other comprehensive income		(41,798	)		(3,556	)		(58,483	)		(103,837	)
Others		(284,255	)		(238,725	)		(170	)		(523,150	)
Total		(1,516,091	)		(460,235	)		(58,011	)		(2,034,337	)
Deferred tax assets
Derivative instruments		8,341			(850	)		(7,491	)		—
Provision for impairment or trade receivables		99,887			(15,816	)		—			84,071
Inventory valuation		121			(98	)		—			23
Contribution for construction		16,800			(646	)		—			16,154
Unsettled expenses		127,897			32,539			—			160,436
Provisions		36,178			(3,354	)		—			32,824
Property and equipment		230,278			(1,623	)		—			228,655
Defined benefit liabilities		513,842			48,847			6,782			569,471
Withholding of facilities expenses		6,609			(426	)		—			6,183
Deduction of installment receivables		42			6			—			48
Assets retirement obligation		24,532			4,484			—			29,016
Gain or loss foreign currency translation		10,672			10,005			—			20,677
Deferred revenue		39,641			(3,841	)		—			35,800
Real-estate sales		21,728			(8,043	)		—			13,685
Others		537,209			174,177			(2,949	)		708,437
Total		1,673,777			235,361			(3,658	)		1,905,480
Temporary difference, net		157,686			(224,874	)		(61,669	)		(128,857	)
Tax credit carryforwards		102,898			25,347			—			128,245
Total net balance		260,584			(199,527	)		(61,669	)		(612	)

F-77

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	2020
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		(10,898	)		10,055			—			(843	)
Investment in subsidiaries, associates, and joint ventures		(108,191	)		(64,553	)		(8,820	)		(181,564	)
Depreciation		(11,606	)		7,431			—			(4,175	)
Advanced depreciation provision		(313,121	)		1,203			—			(311,918	)
Deposits for severance benefits		(496,853	)		(26,419	)		2,015			(521,257	)
Accrued income		(1,541	)		(212	)		—			(1,753	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(410,863	)		67,898			—			(342,965	)
Contract assets		(53,750	)		(112,794	)		—			(166,544	)
Financial assets at fair value through profit or loss		(323	)		(304	)		—			(627	)
Financial assets at fair value through other comprehensive income		(103,837	)		(4,420	)		77,634			(30,623	)
Others		(523,150	)		53,797			—			(469,353	)
Total		(2,034,337	)		(68,318	)		70,829			(2,031,826	)
Deferred tax assets
Derivative instruments		—			40,342			(9,860	)		30,482
Provision for impairment or trade receivables		84,071			4,994			—			89,065
Inventory valuation		23			(259	)		—			(236	)
Contribution for construction		16,154			246			—			16,400
Unsettled expenses		160,436			(24,358	)		—			136,078
Provisions		32,824			1,198			—			34,022
Property and equipment		228,655			(1,695	)		—			226,960
Defined benefit liabilities		569,471			13,707			15,186			598,364
Withholding of facilities expenses		6,183			(436	)		—			5,747
Deduction of installment receivables		48			(20	)		—			28
Assets retirement obligation		29,016			(883	)		—			28,133
Gain or loss foreign currency translation		20,677			(20,539	)		—			138
Deferred revenue		35,800			7,230			—			43,030
Contract assets		—			97,464			—			97,464
Real-estate sales		13,685			(13,685	)		—			—
Others		708,437			(123,798	)		948			585,587
Total		1,905,480			(20,492	)		6,274			1,891,262
Temporary difference, net		(128,857	)		(88,810	)		77,103			(140,564	)
Tax credit carryforwards		128,245			16,686			—			144,931
Total net balance		(612	)		(72,124	)		77,103			4,367

F-78

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The tax impacts recognized directly to equity as at December 31, 2018, 2019, and 2020, are as follows:

	2018									2019									2020
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Gain on valuation of financial assets at fair value through other comprehensive income		59,384			(15,573	)		43,811			225,635			(58,483	)		167,152			54,969			(12,972	)		41,997
Gain (loss) on valuation of hedge instruments		(36,756	)		9,745			(27,011	)		31,003			(8,139	)		22,864			37,247			(9,860	)		27,387
Remeasurements of net defined benefit liabilities		(116,324	)		42,813			(73,511	)		(33,814	)		8,037			(25,777	)		(77,382	)		17,201			(60,181	)
Share of gain(loss) of associates and joint ventures, and others		(1,036	)		179			(857	)		4,493			(1,327	)		3,166			25,538			(8,820	)		16,718
Exchange differences on translation for foreign operations		3,989			(1,049	)		2,940			6,692			(1,759	)		4,933			(3,614	)		948			(2,666	)
Total	￦	(90,743	)	￦	36,115		￦	(54,628	)	￦	234,009		￦	(61,671	)	￦	172,338		￦	36,758		￦	(13,503	)	￦	23,255

Details of income tax expense for the years ended December 31, 2018, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2018			2019		2020
Current income tax expense	￦	329,581		￦	120,533	￦	213,225
Impact of change in deferred taxes		(15,016	)		199,527		72,124
Income tax expense	￦	314,565		￦	320,060	￦	285,349

F-79

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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)	2018			2019			2020
Profit before income tax expense	￦	1,033,977		￦	1,015,928		￦	1,031,605
Statutory income tax expense	￦	273,982		￦	269,018		￦	273,329
Tax effect
Income not taxable for taxation purposes		(85,322	)		(1,265	)		(24,657	)
Non-deductible expenses		18,126			19,543			31,741
Tax credit		(20,319	)		(39,190	)		(47,056	)
Additional payment of income taxes		11,439			3,832			429
Tax effect and adjustment on consolidation
Goodwill impairment		137			159			—
Eliminated dividend income form subsidiaries		31,966			21,917			20,682
Changes of out-side tax effect		618			13,539			38,552
Investment in-kind		82,820			—			—
Intangible Asset impairment and amortization		—			14,052			3,790
Reversal expenses of contract cost assets		—			11,213			(6,643	)
Others		1,118			7,242			(4,818	)
Income tax expense	￦	314,565		￦	320,060		￦	285,349

Details of deferred tax assets and liabilities that are not recognized as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019		2020
Deductible temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	610,351	￦	583,890
Unused tax loss		31,257		28,115
Unused Tax credit		—		2,654
Others		32,494		64,760
Total	￦	674,102	￦	679,419
Taxable temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	141,664	￦	132,848
Others		10,372		9,568
Total	￦	152,036	￦	142,416

F-80

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

The expected period of expiry for unused tax losses not recognized in deferred tax assets as at December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	2019		2020
2021	￦	18,582	￦	2,140
2022		2,140		80,649
2023		80,649		5,848
2024		5,848		4,867
2025		4,867		2,847
2026		9,390		9,709
2027		7,888		8,389
2028		10,064		8,426
2029		2,030		2,579
2030		617		2,339
Total	￦	142,075	￦	127,793

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, 2018, 2019 and 2020, is calculated as follows:

	2018		2019		2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703	￦	700,889
Weighted average number of ordinary shares outstanding (In number of shares)		245,049,466		245,171,283		245,207,307
Basic earnings per share (In Korean won)		2,634		2,634		2,858

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-81

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Diluted earnings per share from operations for the years ended December 31, 2018, 2019 and 2020 is calculated as follows:

	2018		2019			2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703		￦	700,889
Adjustment to net income attributable to ordinary shares (In millions of Korean won)		—		(157	)		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		645,571		645,546			700,889
Number of dilutive potential ordinary shares outstanding (In number of shares)		1,163		70,267			69,598
Weighted average number of ordinary shares outstanding (In number of shares)		245,050,629		245,241,550			245,276,905
Diluted earnings per share (In Korean won)		2,634		2,632			2,858

Diluted earnings per share is earnings per outstanding of ordinary shares and dilutive potential ordinary shares. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares.

31. Dividend

The dividends paid by the Group in 2020, 2019 and 2018 were ￦269,766 million (￦ 1,100 per share), ￦269,659 million (￦ 1,100 per share), and ￦245,097 million (￦ 1,000 per share), respectively. A dividend in respect of the year ended December 31, 2020, of ￦1,350 per share, amounting to a total dividend of ￦326,487 million, was approved at the shareholders’ meeting on March 29, 2021.

F-82

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

32. Cash Generated from Operations

Cash flows from operating activities for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
1. Profit for the year	￦	719,412		￦	695,868		￦	746,256
2. Adjustments to reconcile net income
Income tax expense		314,565			320,060			285,349
Interest income		(265,817	)		(303,722	)		(291,425	)
Interest expense		296,894			278,975			265,035
Dividends income		(2,910	)		(3,408	)		(4,442	)
Depreciation		2,735,413			2,567,754			2,635,307
Amortization of intangible assets		629,526			660,705			628,154
Depreciation of right-of-use assets		—			433,199			404,174
Provision for severance benefits		245,926			256,525			255,615
Impairment losses on trade receivables		113,064			60,193			139,957
Share of net profit or loss of associates and joint ventures		5,912			3,252			(18,041	)
Loss(gain) on disposal of associates and joint ventures		(3,737	)		30			111
Loss(gain) on disposal of right-of-use assets		—			1,556			2,047
Impairment losses on assets held for sale		—			7,586			—
Loss on disposal of property and equipment and investment in properties		68,688			49,284			55,590
Loss(gain) on disposal of intangible assets		(4,256	)		(1,248	)		246
Loss on impairment of intangible assets		12,997			61,899			211,636
Loss(gain) on foreign currency translation		68,952			75,998			(138,011	)
Loss(gain) on valuation and settlement of derivatives, net		(92,210	)		(70,482	)		155,600
Loss(gain) on disposal of financial assets at fair value through profit or loss		(1,712	)		(5,115	)		329
Gain on valuation of financial assets at fair value through profit or loss		(10,768	)		(4,335	)		(59,044	)
Loss(gain) on disposal of financial assets at amortized cost		(44	)		43			(138	)
Others		(55,969	)		143,500			127,949
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		(81,217	)		(433,292	)		66,462
Decrease(Increase) in other receivables		356,643			(79,130	)		685,209
Decrease(increase) in other current assets		(123,258	)		984			9,089
Decrease(increase) in other non-current assets		19,556			(178,180	)		(86,039	)
Decrease(increase) in inventories		(480,543	)		240,488			288,507
Increase(decrease) in trade payables		(167,841	)		44,354			(135,760	)
Decrease in other payables		(448,301	)		(102,375	)		(1,232,646	)
Increase in other current liabilities		291,548			43,384			127,076
Increase(decrease) in other non-current liabilities		144,072			(199,547	)		(56,319	)
Decrease(Increase) in provisions		85,946			(12,164	)		2,264
Decrease(Increase) in deferred revenue		48,201			641			(1,948	)
Increase in plan assets		(53,301	)		(375,499	)		(136,336	)
Payment of severance benefits		(153,209	)		(119,716	)		(186,520	)
4. Cash generated from operations (1+2+3)	￦	4,212,222		￦	4,058,065		￦	4,745,293

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-83

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Significant transactions not affecting cash flows for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Reclassification of the current portion of borrowings	￦	1,149,599		￦	1,030,056		￦	1,229,359
Reclassification of construction-in-progress to property and equipment		1,988,014			2,698,146			3,011,519
Reclassification of accounts payable from property and equipment		122,185			685,859			22,052
Reclassification of accounts payable from intangible assets		584,595			(356,911	)		(345,675	)
Reclassification of payable from defined benefit liability		(31,838	)		(19,053	)		72,346
Reclassification of payable from plan assets		(9,497	)		(14,298	)		66,046

33. Changes in Liabilities Arising from Financing Activities

Changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Beginning			Cash flows			Non-cash													Ending
							Changes in Accounting Policy1		Newly acquired		Exchange difference			Fair Value changes			Others
Borrowing	￦	6,648,294		￦	574,175		￦	—	￦	—	￦	64,398		￦	—		￦	12,000		￦	7,298,867
Lease liabilities		163,858			(485,444	)		771,410		774,906		—			—			(13,379	)		1,211,351
Derivative liabilities		65,067			(9,734	)		—		—		(4,234	)		(20,058	)		(10,945	)		20,096
Derivative assets		(29,843	)		33,635			—		—		(53,729	)		(11,398	)		2,759			(58,576	)
Total	￦	6,847,376		￦	112,632		￦	771,410	￦	774,906	￦	6,435		￦	(31,456	)	￦	(9,565	)	￦	8,471,738

1 For information on the financial impacts due to change in accounting policy, see Note 41.

(In millions of Korean won)	2020
	Beginning			Cash flows			Non-cash													Ending
							Newly acquired		Exchange difference			Fair Value changes			Change in Consolidati- on Scope		Others
Borrowing	￦	7,298,867		￦	167,867		￦	17,523	￦	(157,985	)	￦	—		￦	—	￦	(9,974	)	￦	7,316,298
Lease liabilities		1,211,351			(447,784	)		473,477		(3	)		40			3,564		(97,005	)		1,143,640
		—			(13,674	)		13,674		—			—			—		—			—
Derivative liabilities		20,096			(943	)		2,798		142,511			(23,669	)		—		(10,220	)		130,573
Derivative assets		(58,576	)		34,933			—		2,870			(3,456	)		—		16,623			(7,606	)
Total	￦	8,471,738		￦	(259,601	)	￦	507,472	￦	(12,607	)	￦	(27,085	)	￦	3,564	￦	(100,576	)	￦	8,582,905

34. Segment Information

The Group’s operating segments are as follows:

Details	Business service
ICT	Mobile/fixed line telecommunication service and convergence 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-84

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Details of each segment for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	17,724,320		￦	933,191		￦	2,917,163
Finance		3,771,681			148,440			22,580
Satellite TV		690,821			66,735			98,310
Others		5,159,459			53,316			236,715
		27,346,281			1,201,682			3,274,768
Elimination		(3,910,231	)		(100,822	)		6,964
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2019
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	18,527,631		￦	634,046		￦	3,229,159
Finance		3,795,185			158,235			27,852
Satellite TV		694,637			69,357			94,992
Others		5,845,973			218,402			357,294
		28,863,426			1,080,040			3,709,297
Elimination		(3,964,237	)		(53,070	)		(79,805	)
Consolidated amount	￦	24,899,189		￦	1,026,970		￦	3,629,492

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2020
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1,2
ICT	￦	18,275,765		￦	809,741		￦	3,233,878
Finance		3,686,430			85,008			53,098
Satellite TV		706,631			71,345			84,931
Others		5,944,093			209,078			346,215
		28,612,919			1,175,172			3,718,122
Elimination		(4,172,272	)		(152,839	)		(83,838	)
Consolidated amount	￦	24,440,647		￦	1,022,333		￦	3,634,284

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

2 Property and equipment and intangible assets associated with ICT reporting segment are ￦ 13,583,173 million.

F-85

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Operating revenues for the years ended December 31, 2018, 2019 and 2020 and non-current assets as at December 31, 2019 and 2020 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues						Non-current assets1
Location	2018		2019		2020		2019.12.31		2020.12.31
Domestic	￦	23,376,218	￦	24,832,068	￦	24,368,729	￦	19,198,416	￦	18,934,766
Overseas		59,832		67,121		71,918		76,679		18,243
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647	￦	19,275,095	￦	18,953,009

1 Non-current assets include property and equipment, intangible assets, investment properties and right-of-use assets.

35. Related Party Transactions

The list of related party of the Group as at December 31, 2020, is as follows:

Relationship

Name of Entry

Associates and joint ventures

Korea Information & Technology Investment Fund (KIF Investment Fund), K-Realty CR-REITs No.1, Boston Global Film & Contents Fund L.P., QTT Global (Group) Company Limited, CU Industrial Development Co., Ltd., KD Living, Inc., Oscar Ent. Co., Ltd., LoginD Co., Ltd., K-REALTY CR-REIT 6, K Bank, Inc., Daiwon Broadcasting Co., Ltd., KT-DSC creative economy youth start-up investment fund, Korea electronic Vehicle charging service, K-REALTY RENTAL HOUSING REIT 2, AI RESEARCH INSTITUTE, KT-IBKC Future Investment Fund 1, Gyeonggi-KT Yoojin Superman Fund, FUNDA Co., Ltd., CHAMP IT Co.,Ltd., Alliance Internet Corp., Little big pictures, Virtual Realm Sendirian Berhad, KT Philippines Co., Ltd., Studio Discovery Co., Ltd , KT Young Entrepreneurs DNA Investment Fund, Hyundai Robotics Co., Ltd., IGIS Professional investors Private Investment Real Estate Investment LLC No 395, KT-Smart Factory Investment Fund

Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2019 and 2020, are as follows:

		December 31, 2019
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	608	￦	23,100	￦	—	￦	57,907
	K Bank, Inc.		583		13,664		557		—
	Others		434		1,177		711		—
Total		￦	1,625	￦	37,941	￦	1,268	￦	57,907

F-86

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

		December 31, 2020
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	457	￦	16,200	￦	—	￦	20,857
	K Bank, Inc.		775		32,964		891		—
	Others		72		1,147		858		—
Total		￦	1,304	￦	50,311	￦	1,749	￦	20,857

Significant transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

		2018
(In millions of Korean won)		Sales	Purchases1	Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦2,088	￦31,984	￦8,932
	MOS GS Co., Ltd. 2	493	12,023	8
	MOS Daegu Co., Ltd. 2	229	8,775	8
	MOS Chungcheong Co., Ltd. 2	540	9,159	8
	MOS Gangnam Co., Ltd. 2	333	11,549	10
	MOS GB Co., Ltd. 2	1,378	16,519	12
	MOS BS Co., Ltd. 2	324	11,193	10
	MOS Honam Co., Ltd. 2	331	10,499	10
	K Bank, Inc.	15,705	7,004	—
	NgeneBio 3	3	—	—
	Others	2,888	9,547	2,148
Total		￦24,312	￦128,252	￦11,146

1 The 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

		2019
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	1,302	￦	—
	K Bank, Inc.		17,815		8,524
	Others		1,498		10,531
Others	K-REALTY CR-REIT 10 1		2,801		—
	Total	￦	23,416	￦	19,055

1 The amounts include acquisition of property and equipment and others.

F-87

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

		December 31, 2019
(In millions of Korean won)		Acquisition of lease receivables		Acquisition of right-of-use assets		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦	—	￦	776	￦	2,225	￦	10,928
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		—		4,280
	Others		—		—		—		146
	Total	￦	—	￦	776	￦	2,225	￦	15,354

		2020
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,298	￦	—
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—
	K Bank, Inc.		15,658		8,227
	Others		809		10,272
	Total	￦	18,765	￦	18,499

¹ The amounts include acquisition of primarily property and equipment.

		December 31, 2020
(In millions of Korean won)		Interest income		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1		￦—		￦917		￦8,061
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		9,241
	K Bank, Inc.		14		—		—
	Others		—		—		43
	Total	￦	14	￦	917	￦	17,345

Key management compensation for the years ended December 31, 2018, 2019 and 2020, consists of:

(In millions of Korean won)	2018		2019		2020
Salaries and other short-term benefits	￦	2,762	￦	2,955	￦	2,086
Post-employment benefits		751		321		390
Stock-based compensation		878		891		5,613
Total	￦	4,391	￦	4,167	￦	8,089

F-88

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Fund transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Equity contributions in cash and others
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000
KT-CKP New Media Investment Fund		(1,229	)
PT. Mitra Transaksi Indonesia 1		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
K-REALTY CR REIT 1		—
Korea Information & Technology Investment Fund		—
MOS GS Co., Ltd. 2		(147	)
MOS Daegu Co., Ltd. 2		(147	)
MOS Chungcheong Co., Ltd. 2		(153	)
MOS Gangnam Co., Ltd. 2		(180	)
MOS GB Co., Ltd. 2		(203	)
MOS BS Co., Ltd. 2		(183	)
MOS Honam Co., Ltd. 2		(206	)
Daiwon Broadcasting Co., Ltd.		—
Boston Global Film & Contents Fund L.P.		(986	)
Gyeonggi-KT Green Growth Fund		—
Total	￦	24,713

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

F-89

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	December 31, 2019
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing 2		Repayment
KT-IBKC Future Investment Fund1	￦	—	￦	—	￦	3,750
KT Philippines co. Ltd.		—		—		99
Virtua Realm Sendirian Berhad		—		—		550
K-REALTY CR REIT 1		—		30,385		—
K Bank, Inc		—		—		21,782
KIF Investment Fund		—		—		—
Daiwon Broadcasting Co.,Ltd.		—		—		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		—		—		—
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
KT-CKP New Media Investment Fund		—		—		(174	)
KT-DSC creative economy youth start-up investment fund		—		—		(1,800	)
KT-Smart Factory Investment Fund		—		—		2,800
KT-SB Venture Investment Fund		—		—		(2,404	)
Total	￦	—	￦	30,385	￦	25,603

1 Borrowing transactions include lease transactions.

2 Conversion effect from the adoption of IFRS 16 Lease on January 1, 2019 has been excluded.

	December 31, 2020
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing		Repayment
K- Realty CR-REITs No.1	￦	—	￦	20,304	￦	—
Studio Discovery Co. Ltd.		—		—		3,000
KT Young Entrepreneurs DNA Investment Fund		—		—		3,600
KT-Smart Factory Investment Fund		—		—		2,800
KT-CKP New Media Investment Fund		—		—		(109	)
K Bank Inc.		—		—		195,011
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
Hyundai Robotics Co. Ltd.		—		—		50,000
Total	￦	—	￦	20,304	￦	255,302

1 Borrowing transactions include lease transactions.

As at December 31, 2020, there is no collateral or payment guarantee provided to or from related parties.

F-90

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

36. Financial Risk Management

(1) Financial Risk Factors

The Group’s activities expose it to a variety of financial risks: market 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, 2018, 2019 and 2020, 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
2018.12.31		10	%	￦	7,212		￦	10,196
		-10	%		(12,413	)		(9,625	)
2019.12.31		10	%	￦	45,149		￦	52,092
		-10	%		(45,149	)		(52,092	)
2020.12.31		10	%	￦	25,220		￦	36,961
		-10	%		(25,220	)		(36,961	)

F-91

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2018, 2019 and 2020, are as follows:

(In thousands of foreign currencies)	2018				2019				2020
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		528,539		1,893,849		645,941		1,830,764		400,046		1,937,935
SDR1		267		730		255		729		255		728
JPY		66,078		50,000,000		24,930		80,000,000		209,376		46,000,009
GBP		—		256		—		56		—		—
EUR		2		6		1		6		316		162
DZD2		618		—		—		—		—		—
CNY		1,954		171		457		161		458		491
UZS3		121,053		—		—		—		—		—
RWF4		857		—		706		—		646		—
THB5		—		—		—		—		535		—
MMK6		84		—		84		—		—		—
TZS7		—		2,876		6,919		—		1,019		—
BWP8		897		—		911		—		212		—
HKD		—		—		—		268		—		198
BDT9		39,494		—		18,897		—		—		—
PLN10		26		—		—		—		26		—
VND11		467,272		—		271,563		—		242,370		—
XAF12		666		—		97,411		—		16,229		—
SGD		—		—		—		—		6		284,000

¹  Special Drawing Rights.

²  Algeria Dinar.

³  Uzbekistan Sum.

⁴  Rwanda Franc.

⁵  Thailand Bhat.

⁶  Myanmar Kyat.

⁷  Tanzanian Shilling.

⁸  Botswana Pula.

⁹  Bangladesh Taka.

¹⁰  Polish Zloty.

¹¹  Vietnam Dong.

¹²  Central African Franc.

F-92

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(iii) Price risk

As at December 31, 2018, 2019 and 2020, 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
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)
2019.12.31	10%	￦	24		￦	613
	-10%		(24	)		(613	)
2020.12.31	10%	￦	2,811		￦	3,472
	-10%		(2,811	)		(3,472	)

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, 2018, 2019 and 2020, 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
2018.12.31		+ 100 bp	￦	1,059		￦	9,689
		- 100 bp		(1,958	)		(10,237	)
2019.12.31		+ 100 bp	￦	425		￦	14,764
		- 100 bp		(482	)		(19,280	)
2020.12.31		+ 100 bp	￦	973		￦	18,584
		- 100 bp		(973	)		(19,377	)

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-93

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

- 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.

The maximum exposure to credit risk of the Group’s financial instruments without considering value of collaterals as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Cash and cash equivalents (except for cash on hand)	￦	2,226,608	￦	2,625,581
Trade and other receivables
Financial assets at amortized costs		5,784,228		5,034,621
Financial assets at fair value through other comprehensive income		1,256,266		1,118,619
Contract assets		557,041		586,438
Other financial assets
Derivatives financial assets for hedging		58,576		7,684
Financial assets at fair value through profit or loss		541,657		680,453
Financial assets at fair value through other comprehensive income		7,086		6,570
Financial assets at amortized costs		441,804		671,068
Total	￦	10,873,266	￦	10,731,034

F-94

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(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.

The Group measures the expected credit loss by considering the future irrecoverability rate of the remaining balance of trade receivables and other receivables at the end of the reporting period. Each trade receivables and other receivables are classified considering the credit risk characteristics and overdue periods in order to measure expected credit loss. The expected credit loss rate calculation is based on historical payment and credit loss information in relation to revenue for 36 months period up to December 31, 2020. Expected credit loss of 12 months was applied as the credit sales and other credit-related assets of BC Card Co., Ltd., a subsidiary of the Group, has been determined to have low credit risk.

(ii) Cash equivalents (except for cash on hand)

The Group is also exposed to credit risk in relation cash equivalents. 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

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 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.

F-95

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 consolidated financial statements.

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	8,149,445	￦	805,241	￦	370,044	￦	9,324,730
Borrowings(including debentures)		1,304,936		4,417,639		2,493,637		8,216,212
Lease liabilities		397,609		688,518		221,255		1,307,382
Other non-derivative financial liabilities		1,749		175,764		18,962		196,475
Financial guarantee contracts1		19,422		—		—		19,422
Total	￦	9,873,161	￦	6,087,162	￦	3,103,898	￦	19,064,221

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.

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	6,587,796	￦	730,758	￦	258,255	￦	7,576,809
Borrowings(including debentures)		1,573,944		4,373,534		2,258,360		8,205,838
Lease liabilities		336,024		658,501		190,907		1,185,432
Other non-derivative financial liabilities		574		131,242		—		131,816
Financial guarantee contracts1		22,422		—		—		22,422
Total	￦	8,520,760	￦	5,894,035	￦	2,707,522	￦	17,122,317

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-96

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Cash outflow and inflow of derivatives settled gross or net are undiscounted contractual cash flow and can differ from the amount in the consolidated financial statements.

	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

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	650,497	￦	1,602,513	￦	507,947	￦	2,760,957
Inflow		684,720		1,648,746		524,483		2,857,949

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	248,300	￦	2,179,046	￦	498,619	￦	2,925,965
Inflow		249,301		2,074,747		480,570		2,804,618

(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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Total liabilities	￦	19,491,530		￦	18,111,112
Total equity		15,140,684			15,551,433
Debt-to-equity ratio		129	%		116	%

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, 2019 and 2020, are as follows:

(In millions of Korean won, %)	December 31, 2019			December 31, 2020
Total borrowings	￦	7,298,867		￦	7,316,298
Less: cash and cash equivalents		(2,305,894	)		(2,634,624	)
Net debt		4,992,973			4,681,674
Total equity		15,140,684			15,551,433
Total capital		20,133,657			20,233,107
Gearing ratio		25	%		23	%

F-97

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(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, 2019
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables	￦	66,487	￦	(1	)	￦	66,486	￦	(63,604	)	￦	—	￦	2,882
Other financial assets		18,571		(13	)		18,558		(18,526	)		—		32
	￦	85,058	￦	(14	)	￦	85,044	￦	(82,130	)	￦	—	￦	2,914

(In millions of Korean won)

December 31, 2020

Gross assets

Gross liabilities offset

Net amounts presented in the statement of financial position

Amounts not offset

Net amount

Financial instruments

Cash collateral

Trade receivables

￦

71,497

￦

(1

)

￦

71,496

￦

(67,421

)

￦

—

￦

4,075

Netting arrangements with reference to the offers of telecommunication facility interconnection, sharing data, and others among telecommunication 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, 2019
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	65,669	￦	(13	)	￦	65,656	￦	(63,628	)	￦	—	￦	2,028
Other financial liabilities		18,509		(1	)		18,508		(18,502	)		—		6
	￦	84,178	￦	(14	)	￦	84,164	￦	(82,130	)	￦	—	￦	2,034

(In millions of Korean won)	December 31, 2020
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	69,361	￦	—		￦	69,361	￦	(67,421	)	￦	—	￦	1,940
Other financial liabilities		1		(1	)		—		—			—		—
	￦	69,362	￦	(1	)	￦	69,361	￦	(67,421	)	￦	—	￦	1,940

Netting arrangements with reference to the offers of telecommunication facility interconnection, sharing data, and others among telecommunication companies.

F-98

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2019 and 2020, are as follows:

	December 31, 2019				December 31, 2020
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	2,305,894		1	￦	2,634,624		1
Trade and other receivables
Financial assets measured at amortized cost 2		5,748,459		1		4,976,423		1
Financial assets at fair value through other comprehensive income		1,256,266		1,256,266		1,118,619		1,118,619
Other financial assets
Financial assets measured at amortized cost		441,804		1		671,068		1
Financial assets at fair value through profit or loss		632,324		632,324		809,919		809,919
Financial assets at fair value through other comprehensive income		557,342		557,342		258,516		258,516
Derivative financial assets for hedging		58,576		58,576		7,684		7,684
Total	￦	11,000,665			￦	10,476,853
Financial liabilities
Trade and other payables	￦	8,679,698		1	￦	7,017,639		1
Borrowings		7,298,867		1		7,316,298		1
Other financial liabilities
Financial liabilities at amortized cost		129,945		1		132,558		1
Financial liabilities at fair value through profit or loss		38		38		2,682		2,682
Derivative financial liabilities for hedging		20,096		20,096		127,929		127,929
Total	￦	16,128,644			￦	14,597,106

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value

2 With the application of IFRS 7, lease receivables are excluded from fair value disclosure.

37.2 Fair Value Hierarchy

To provide an indication about the reliability of the inputs used in determining fair value, the Group classifies its financial instruments into the three levels prescribed under the accounting standards.

F-99

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Financial instruments that are measured at fair value are categorized by the fair value hierarchy, and the defined levels are as follows:

• Level 1: The fair value of financial instruments traded in active markets is based on quoted market prices at the end of the reporting period. The quoted market price used for financial assets held by the Group is the current bid price. These instruments are included in level 1.

• Level 2: The fair value of financial instruments that are not traded in an active market is determined using valuation techniques which maximize the use of observable market data and rely as little as possible on entity-specific estimates. If all significant inputs required to fair value an instrument are observable, the instrument is included in level 2.

• Level 3: If one or more of the significant inputs is not based on observable market data, the instrument is included in 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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,256,266	￦	—	￦	1,256,266
Other financial assets
Financial assets at fair value through profit or loss		232		136,951		495,141		632,324
Financial assets at fair value through other comprehensive income		6,738		508,550		42,054		557,342
Derivative financial assets for hedging		—		40,788		17,788		58,576
Disclosed fair value
Investment properties		—		—		2,304,583		2,304,583
Total	￦	6,970	￦	1,942,555	￦	2,859,566	￦	4,809,091
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	38	￦	—	￦	38
Derivative financial liabilities for hedging		—		20,096		—		20,096
Total	￦	—	￦	20,134	￦	—	￦	20,134

F-100

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

(In millions of Korean won)	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,118,619	￦	—	￦	1,118,619
Other financial assets
Financial assets at fair value through profit or loss		46,449		330,961		432,509		809,919
Financial assets at fair value through other comprehensive income		5,606		202,121		50,789		258,516
Derivative financial assets for hedging		—		7,684		—		7,684
Disclosed fair value
Investment properties		—		—		2,645,482		2,645,482
Total	￦	52,055	￦	1,659,385	￦	3,128,780	￦	4,840,220
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	45	￦	2,637	￦	2,682
Derivative financial liabilities for hedging		—		123,735		4,194		127,929
Total	￦	—	￦	123,780	￦	6,831	￦	130,611

F-101

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

37.3 Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements

There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements.

Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2019 and 2020, are as follows:

	2019
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Derivative financial assets (liabilities) for hedging			Financial liabilities at fair value through profit or loss
Beginning balance	￦	163,600		￦	311,536		￦	(10,183	)	￦	7,758
Purchases		584,671			6,081			—			—
Reclassification		225,873			(444,782	)		—			—
Disposal		(485,419	)		(941	)		—			(9,734	)
Amount recognized in profit or loss1,2		6,416			—			14,462			1,976
Amount recognized in other comprehensive income1		—			170,160			13,509			—
Ending balance	￦	495,141		￦	42,054		￦	17,788		￦	—

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

	2020
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Financial liabilities at fair value through profit or loss			Derivative financial assets (liabilities) for hedging
Beginning balance	￦	495,141		￦	42,054		￦	—		￦	(17,788	)
Purchases		374,259			13,142			2,798			—
Reclassification		208			—			—			—
Disposal		(451,663	)		(571	)		—			—
Amount recognized in profit or loss1,2		14,564			(428	)		(161	)		29,345
Amount recognized in other comprehensive income1		—			(3,408	)		—			(7,363	)
Ending balance	￦	432,509		￦	50,789		￦	2,637		￦	4,194

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

F-102

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,256,266		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		632,092		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		550,604		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		58,576		2,3	Hull-White model, DCF Model
Investment properties		2,304,583		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	38		2	DCF Model
Derivative financial liabilities for hedging		20,096		2	DCF Model

F-103

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	December 31, 2020
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,118,619		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		763,470		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		252,910		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		7,684		2	DCF Model
Investment properties		2,645,482		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	2,682		2,3	DCF Model, Binomial Option Pricing
Derivative financial liabilities for hedging		127,929		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, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	5,107		￦	(2,824	)	￦	3,682		￦	—
II. New transactions		—			—			—			—
III. Recognized at fair value through profit or loss		(1,425	)		2,824			(1,425	)		—
IV. Ending balance (I+II+III)	￦	3,682		￦	—		￦	2,257		￦	—

F-104

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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 Asset Backed Commercial Paper (“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, 2020, 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. 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 Private Equity Fund (“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, 2020, 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.

F-105

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,595,895	￦	4,060,992	￦	2,562,931	￦	8,219,818
Assets recognized in statement of financial position
Other financial assets	￦	15,816	￦	100,496	￦	—	￦	116,312
Joint ventures and associates		8,542		192,022		—		200,564
Total	￦	24,358	￦	292,518	￦	—	￦	316,876
Maximum loss exposure1
Investment assets	￦	24,358	￦	292,518	￦	—	￦	316,876
Total	￦	24,358	￦	292,518	￦	—	￦	316,876

1 It includes the investments recognized in the Group’s consolidated 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.

	December 31, 2020
(In millions of Korean won)	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	2,004,869	￦	4,380,534	￦	2,152,412	￦	8,537,815
Assets recognized in statement of financial position
Other financial assets	￦	29,874	￦	128,332	￦	—	￦	158,206
Joint ventures and associates		51,607		219,753		—		271,360
Total	￦	81,481	￦	348,085	￦	—	￦	429,566
Maximum loss exposure1
Investment assets	￦	81,481	￦	348,085	￦	—	￦	429,566
Cash deficiency support		—		29,130		—		29,130
Total	￦	81,481	￦	377,215	￦	—	￦	458,696

1 It includes the investments recognized in the Group’s consolidated 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-106

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2018, 2019 and 2020 are as follows:

(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.		49.7	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.5	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.2	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co.,Ltd.		32.9	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.2	%		103,468		59			—			(170	)		103,357

(In millions of Korean won)	December 31, 2019
	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.		49.7	%	￦	374,150	￦	10,029		￦	(8,279	)	￦	6		￦	375,906
BC Card Co., Ltd.		30.5	%		345,547		37,795			(18,900	)		53,033			417,475
KT Powertel Co., Ltd.		55.2	%		52,865		1,751			—			(340	)		54,276
KT Hitel Co., Ltd.		32.9	%		52,336		1,720			—			653			54,709
KT Telecop Co., Ltd.		13.2	%		103,357		(588	)		—			(99,119	)		3,650

(In millions of Korean won)	December 31, 2020
	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.		49.7	%	￦	375,906	￦	22,171		￦	(8,279	)	￦	(898	)	￦	388,900
BC Card Co., Ltd.		30.5	%		417,475		9,899			(22,787	)		7,239			411,826
KT Powertel Co., Ltd.		55.2	%		54,276		2,151			(478	)		(202	)		55,747
KT Hitel Co., Ltd.		32.9	%		54,709		(1,840	)		—			(2,563	)		50,306
KT Telecop Co., Ltd.		13.2	%		3,650		152			—			(208	)		3,594

F-107

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

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, 2018, 2019 and 2020, are as follows:

	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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
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-108

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	December 31, 2019
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	459,077		￦	2,580,634		￦	86,465		￦	115,694		￦	55,908
Non-current assets		389,199			1,332,348			31,587			164,124			223,969
Current liabilities		123,506			2,452,219			17,757			62,378			64,218
Non-current liabilities		19,333			142,013			2,009			12,391			89,622
Equity		705,437			1,318,750			98,286			205,049			126,037
Operating revenue		704,996			3,553,008			62,846			323,065			332,063
Profit or loss for the year		56,008			115,885			3,085			1,426			(4,875	)
Total comprehensive income (loss)		55,936			289,122			2,469			(1,840	)		(6,558	)
Cash flows from operating activities		152,549			429,331			780			49,870			52,693
Cash flows from investing activities		(101,594	)		(419,894	)		(9,525	)		(50,138	)		(44,393	)
Cash flows from financing activities		(18,833	)		(5,744	)		(687	)		(1,860	)		(5,227	)
Net increase (decrease) in cash and cash equivalents		32,122			3,693			(9,432	)		(2,128	)		3,073
Cash and cash equivalents at beginning of year		31,728			275,089			15,649			39,186			5,708
Exchange differences		—			380			—			(15	)		—
Cash and cash equivalents at end of year		63,850			279,162			6,217			37,043			8,781

F-109

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

	December 31, 2020
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	480,450		￦	1,785,914		￦	90,056		￦	140,948		￦	79,076
Non-current assets		439,026			1,298,484			29,638			148,001			239,380
Current liabilities		153,236			1,602,667			17,045			74,045			136,565
Non-current liabilities		21,803			176,083			1,788			18,554			57,172
Equity		744,437			1,305,648			100,861			196,350			124,719
Operating revenue		706,631			3,387,641			65,898			350,231			392,489
Profit or loss for the year		58,190			39,455			3,809			2,080			212
Total comprehensive income (loss)		55,647			61,796			3,442			(8,700	)		(1,319	)
Cash flows from operating activities		160,934			(119,163	)		6,011			62,521			35,834
Cash flows from investing activities		(105,293	)		58,042			(3,353	)		(58,186	)		(57,976	)
Cash flows from financing activities		(19,650	)		22,790			(1,515	)		(1,856	)		14,652
Net increase (decrease) in cash and cash equivalents		35,991			(38,331	)		1,143			2,479			(7,490	)
Cash and cash equivalents at beginning of year		63,850			279,162			6,217			37,043			8,781
Exchange differences		(7	)		(247	)		—			(83	)		—
Cash and cash equivalents at end of year		99,834			240,584			7,360			39,439			1,291

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 2018, 2019 and 2020 is summarized as follows:

(In millions of Korean won)	2018			2019			2020
Carrying amount of non-controlling interests acquired	￦	(194	)	￦	(9,566	)	￦	1,750
Consideration paid to non-controlling interests		11,312			484			9,878
Excess of consideration paid recognized in parent’s equity	￦	11,118		￦	(9,082	)	￦	11,628

40. Business Combination

On April 30, 2020, the Controlling Company acquired 1,400,000 shares (59.8%) of KT Engineering Co., Ltd. (formerly KT ENG Core) and 940,000 shares (40.2%) of KT Estate, a subsidiary of the Group, to cultivate an engineering company in the group through early normalization and termination of corporate rehabilitation of KT Engineering Co., Ltd. (formerly KT ENG Core). Through these transactions, KT Engineering Co., Ltd. (formerly KT ENG Core Co., Ltd.) was included as a subsidiary, and it was accounted for in accordance with IFRS 3 Business Combinations.

F-110

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

As a result of applying the acquisition method, identifiable intangible assets of ￦ 3 million and goodwill of ￦ 407 million were generated.

As of the acquisition date of control, the total consideration transferred, the recognized amount of assets acquired and liabilities acquired by major types, and calculation details of goodwill are as follows:

(In millions of Korean won)	Amount
Total transfer cost (a)	￦	46,800
Recognized amount of assets acquired and liabilities assumed (b)1		46,393
Cash and cash equivalents		57,845
Trade and other receivable		95,814
Other financial assets		3,110
Other assets		14,021
Inventories		1,521
Property and equipment		3,128
Intangible assets		410
Trade and other payables		(105,964	)
Other liabilities		(4,815	)
Current income tax liabilities		(3,664	)
Other provisions		(13,745	)
Retirement benefit liabilities		(1,268	)
Goodwill (a-b)	￦	407

1 Assets acquired and liabilities acquired in accordance with IFRS 3 Business Combinations are measured at fair value.

As at December 31, 2020, goodwill is subject to change as the underwriting results of fair value valuation of identifiable asset liabilities for allocation of consideration has not been confirmed.

After the acquisition of control, operating income included in the consolidated statement before the removal of intercompany transactions is ￦ 250,380 million and net loss is ￦ 1,948 million. Had KT Engineering (KT ENGCORE Co., Ltd.) consolidated on January 1, 2020, the operating revenue that would be included is ￦ 387,697 million and the net loss for the year is ￦ 8,461 million.

41. Changes in Accounting Policies – Determination of Lease Term Considering Economic Penalty

From January 1, 2020, the Group has changed its accounting policy by adopting accounting treatments in accordance with agenda decisions for ‘Lease Term and Useful Life of Leasehold Improvements’ issued by IFRS Interpretations Committee on December 16, 2019. The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable. The changes in accounting policy have been adopted retrospectively in accordance with IAS 8 Accounting Policies, Changes in

F-111

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

Accounting Estimates and Errors, and comparatives for the 2019 financial year have been adjusted.

In relation to the changes in accounting policy, the adjusted amounts recognized in each line item in the consolidated financial statements are as follows:

Consolidated Statements of Financial Position

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Current assets
Prepaid expenses	￦	76,036	￦	(1,026	)	￦	75,010	￦	61,930	￦	(2,119	)	￦	59,811
Non-current assets
Right-of-use assets		788,497		479,832			1,268,329		585,034		632,145			1,217,179
Current liabilities
Lease liabilities	￦	355,833	￦	36,600		￦	392,433	￦	281,961	￦	63,263		￦	345,224
Non-current liabilities
Lease liabilities		373,307		445,612			818,919		231,884		566,532			798,416
Total liabilities	￦	729,140	￦	482,212		￦	1,211,352	￦	513,845	￦	629,795		￦	1,143,640
Net assets
Retained earnings	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420
Total equity	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420

Consolidated Statements of Operations

	2019							2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Operating revenue	￦	24,899,189	￦	—		￦	24,899,189	￦	24,434,851	￦	5,796		￦	24,440,647
Operating expenses		23,879,015		(6,796	)		23,872,219		23,425,377		(7,063	)		23,418,314
Finance income		424,395		—			424,395		498,614		—			498,614
Finance costs		421,931		10,202			432,133		498,161		9,222			507,383
Income tax expense		320,060		—			320,060		285,349		—			285,349
Profit for the year		699,274		(3,406	)		695,868		742,619		3,637			746,256
Basic earnings per share		2,648		(14	)		2,634		2,843		15			2,858
Diluted earnings per share		2,646		(14	)		2,632		2,840		18			2,858

With the initial adoption of IFRS 16 Lease, right-of-use assets and lease liabilities increased by ￦ 899,783 million and ￦ 643,375 million, respectively, as at January 1, 2019. In consideration of the economic penalties to be incurred from the contractual obligations, changes in accounting policy in relation to lease term resulted in an additional increase to the beginning balance of right-of-use assets and lease liabilities, by the amount of ￦ 128,035 million and ￦ 128,035 million, respectively, for the year as at January 1, 2019 (Note 33).

F-112

KT Corporation and Subsidiaries

Notes to the Consolidated Financial Statements

December 31, 2018, 2019 and 2020

42. Events After Reporting Period

The Group has issued the following bonds since the end of the reporting period.

Type	Issued date		Face value (In millions of Korean won)		Interest rate			Redemption date
The 194-1st Public bond		Jan. 27, 2021	￦	130,000		1.13	%		Jan. 26, 2024
The 194-2nd Public bond		Jan. 27, 2021		140,000		1.45	%		Jan. 27, 2026
The 194-3rd Public bond		Jan. 27, 2021		50,000		1.85	%		Jan. 27, 2031
The 194-4th Public bond		Jan. 27, 2021		80,000		1.98	%		Jan. 25, 2041

F-113

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

March 30, 2020

March 29, 2021

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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

- 2 -

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. Freight Transportation Business, Cargo Transportation Intermediation Business

32. Manufacturing and sales of medical device

33. 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.

- 3 -

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); However, anyone who has become an officer of KT and thus becomes the Related Person is excluded (Including such officers who are not engaged full time at the affiliates as a director or an auditor).

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;

- 4 -

However, anyone who has become an officer of KT and thus becomes the Related Person is excluded (Including such officers who are not engaged full time at the affiliates as a director or an auditor).

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. (Equal Dividends) KT distributes dividends equally for all shares(including shares converted from convertible bonds) regardless of the issue date for the same stock, issued by the company as of the dividend base date.

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. (Record Date)

(1) 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.

- 5 -

(2) KT may, for convening an Extraordinary General Meeting of Shareholders or when necessary, let the shareholders who are entered into the register of shareholders on the date determined by the resolution of the Board of Directors, exercise their rights. KT shall announce the date determined by the Board of Directors before 2 weeks from the date.

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) In case convertible bonds are converted into shares, KT pay interest which payment time has reached before conversion.

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.

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.

- 6 -

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 date referred to paragraph (1) of Article 14, and Extraordinary General Meeting of Shareholders may be convened at any time, by the Representative Director (In these Articles of Incorporation, the Representative Director means the one elected at the General Meeting of Shareholder, pursuant to the Paragraph (1) of Article (25)) pursuant to a resolution of the Board of Directors except as otherwise provided by the relevant laws and regulations. Provided, however, that Paragraph (2) of Article (29) shall apply mutatis mutandis in the event the Representative Director 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 Representative Director 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 Representative Director 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.

However, in which voting rights can be exercised electronically, members of the Audit Committee can be elected with the approval of a majority vote of the shareholders present at the General meeting is obtained.

- 7 -

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 Representative Director, shall not exceed three (3), and the number of outside directors shall not exceed eight (8).

Article 25. (Election of Representative Director and Directors, etc.)

(1) The Representative Director 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 Representative Director may be additionally elected as a representative director (hereafter “Representative Director appointed by the Board of Director”) by a resolution of the Board of Directors.

(2) The dismissal of the Representative Director 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 appointed by the Board of Directors other than the Representative Director shall be in accordance with the resolution under Article 38 of these Articles of Incorporation.

(3) Inside directors other than the Representative Director 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 Representative Director with the consent of the Board of Directors. The Representative Director 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 Representative Director 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 Representative Director, the candidate for the Representative Director shall recommend candidates for the inside

- 8 -

directors with the consent of the Board of Directors. Provided, however, that the candidate for the Representative Director is not elected as the Representative Director 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.

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(2) The aggregated term of office of an outside director shall be not more than six (6) 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 Representative Director and Directors)

(1) The Representative Director 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 appointed by the Board of Directors in consideration of his/her necessity.

(2) Inside directors shall assist the Representative Director and shall perform their duties. In the event the Representative Director 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 Representative Director 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 Representative Director 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 Representative Director 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.

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Article 32. (Representative Director Candidate Examination Committee)

(1) KT shall organize the Representative Director Candidate Examination Committee to examine the candidates for Representative Director 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 Representative Director Candidate Examination Committee shall not be a candidate for the Representative Director, and the same shall apply in the event of serving a consecutive term.

(2) The Representative Director 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 Representative Director (or before the elapse of within two (2) weeks from the date of retirement of the Representative Director 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 Representative Director so elected and the chairman of the Board of Directors.

(3) The chairman of the Representative Director 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 Representative Director 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 candidates for Representative Director and the Representative Director Candidate Examination Committee shall examine all of the candidates for Representative Director 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 Representative Director Candidate Examination Committee shall be determined through the resolution of the Board of Directors.

Article 33. (Election of Representative Director)

(1) Representative Director 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 candidate pool for Representative Director and shall select the candidates for Representative Director who will be subject to examination in compliance with the decision of the Board of Directors.

(3) The Representative Director Candidate Examination Committee shall determine the candidates for Representative Director in compliance with the decision of the Board of the Directors by examining, pursuant to the examination criteria determined under Paragraph (4) of Article 32, the candidates for Representative Director selected under Paragraph (2) and report to the Board of Directors the outcome of the examination thereof.

(4) The Board of Directors shall confirm one (1) person as a candidate for Representative Director from among the candidates for the Representative Director per Paragraph (3) above and recommend such person so confirmed to the General Shareholders’ Meeting.

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(5) The Board of Directors shall, in confirming the candidate for Representative Director, consult and decide with such candidates the terms of employment contract including the management goals.

(6) The Board of Directors shall recommend the candidate for Representative Director to the General Shareholders’ Meeting and concurrently submit a draft employment contract.

(7) The Representative Director 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 consecutive appointment of the Representative Director.

Article 34. (Execution of Employment Contract with the Candidate for Representative Director)

(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 employment contract with the candidate for Representative Director. In such case, the Chairman of the Board of Directors shall, on behalf of KT, sign the employment contract.

(2) The Board of Directors may conduct a performance review to determine if the new Representative Director has performed his/her duties under the employment 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 Representative Director has failed to achieve the management goal, it may propose to dismiss the Representative Director 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 goal of management plans during the term of Representative Director’s office 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 Representative Director 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.

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(4) Managing officers who do not hold the position of inside directors of KT shall be elected by the Representative Director 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 Representative Director.

Article 36. (Advisor, etc.)

The Representative Director 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 Representative Director 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 Representative Director.

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.

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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. Representative Director 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 candidate pool for Representative Director under Paragraph (2) of Article 33 shall not participate in any resolution regarding the election of the Representative Director.

(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.

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(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, etc.)

(1) The Representative Director 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 Representative Director at least one (1) week before the General Shareholders’ Meeting.

(3) The Representative Director 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 Representative Director 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 Representative Director 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;

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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 date referred to paragraph (1) of Article 14 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.

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(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.

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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.

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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.

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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.

ADDENDUM (March 30, 2020)

Article 1. (Enforcement Date)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

Article 2. (Transitional Measure)

① The candidate for President as confirmed as at the time these Articles of Incorporation enter into force, pursuant to the previous Articles of Incorporation, shall be deemed the candidate for Representative Director as confirmed by these Articles of Incorporation.

② Resolutions and reports of the Board of Directors or committees within the Board of Director taken pursuant to the previous Articles of Associations, associated with the General Meeting of Shareholders as at the time these Articles of Incorporation enter into force, shall be deemed to have been taken in accordance with these Articles of Incorporation.

ADDENDUM (March 29, 2021)

Article 1. (Enforcement Date)

These Articles of Incorporation shall become effective as of the date of resolution of the General Meeting of Shareholders.

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EX-8.1

Exhibit 8.1

List of Subsidiaries of KT Corporation

(As of December 31, 2020)

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.2	Korea
KT Strategic Investment Fund No.3	Korea
KT Strategic Investment Fund No.4	Korea
KT Strategic Investment Fund No.5	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
KTGDH Co., Ltd. (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 Huimangjieum	Korea
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.	Korea

K-REALTY RENTAL HOUSING REIT 3	Korea
KT Rwanda Networks Ltd.	Rwanda
AOS Ltd.	Rwanda
KT Belgium	Belgium
Korea Telecom Japan Co., Ltd.	Japan
KBTO Sp.z o.o.	Poland
Korea Telecom China Co., Ltd.	China
KT Dutch B.V	Netherlands
East Telecom LLC	Uzbekistan
Korea Telecom America, Inc.	USA
PT. BC Card Asia Pacific	Indonesia
KT Hongkong Telecommunications Co., Ltd.	Hong Kong
Korea Telecom Singapore Pte. Ltd.	Singapore
Texnoprosistem LLC	Uzbekistan
Nasmedia Thailand Co., Ltd.	Thailand
Storywiz Co., Ltd.	Korea
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Korea

2

EX-12.1

Exhibit 12.1

CERTIFICATION

I, Hyeon-Mo Ku, 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, 2021

/s/ HYEON-MO KU

Hyeon-Mo Ku

Representative Director and

Chief Executive Officer

EX-12.2

Exhibit 12.2

CERTIFICATION

I, Young-Jin Kim, 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, 2021

/s/ YOUNG-JIN KIM

Young-Jin Kim

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, 2020 (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/ HYEON-MO KU

Hyeon-Mo Ku

Representative Director and

Chief Executive Officer

Date: April 30, 2021

/s/ YOUNG-JIN KIM

Young-Jin Kim

Executive Vice President and

Chief Financial Officer

Date: April 30, 2021

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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Cover Page	12 Months Ended
	Dec. 31, 2020 shares
Document Information [Line Items]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
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 Common Stock, Shares Outstanding	241,842,130
Entity Voluntary Filers	No
Entity Address, Country	KR
ICFR Auditor Attestation Flag	true
Document Shell Company Report	false
Entity Interactive Data Current	Yes
Document Transition Report	false
Document Annual Report	true
ADS [Member]
Document Information [Line Items]
Trading Symbol	KT
Title of 12(b) Security	American Depositary Shares
Security Exchange Name	NYSE
Ordinary shares [member]
Document Information [Line Items]
Trading Symbol	KT
Title of 12(b) Security	Ordinary share
Security Exchange Name	NYSE

XML

Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	₩ 2,634,624	₩ 2,305,894
Trade and other receivables, net	4,902,471	5,858,696
Other financial assets	1,202,840	868,388
Current income tax assets	2,059	68,120
Inventories, net	534,636	791,677
Assets held for sale	1,198	83,602
Other current assets	1,876,352	1,999,282
Total current assets	11,154,180	11,975,659
Non-current assets
Trade and other receivables, net	1,250,769	1,181,798
Other financial assets	544,347	821,658
Property and equipment, net	14,206,119	13,785,299
Right-of-use assets	1,217,179	1,268,329
Investment properties, net	1,368,453	1,387,430
Intangible assets, net	2,161,258	2,834,037
Investments in associates and joint ventures	557,881	267,660
Deferred income tax assets	433,698	424,856
Other non-current assets	768,661	685,488
Total non-current assets	22,508,365	22,656,555
Total assets	33,662,545	34,632,214
Current liabilities
Trade and other payables	6,210,099	7,597,478
Borrowings	1,418,114	1,185,725
Other financial liabilities	2,493	943
Current income tax liabilities	232,225	66,266
Provisions	165,990	175,612
Deferred revenue	60,252	53,473
Other current liabilities	1,103,299	1,068,557
Total current liabilities	9,192,472	10,148,054
Non-current liabilities
Trade and other payables	807,540	1,082,220
Borrowings	5,898,184	6,113,142
Other financial liabilities	260,676	149,136
Defined benefit liabilities, net	378,087	365,663
Provisions	86,202	78,550
Deferred revenue	149,050	99,180
Deferred income tax liabilities	429,331	425,468
Other non-current liabilities	909,570	1,030,117
Total non-current liabilities	8,918,640	9,343,476
Total liabilities	18,111,112	19,491,530
Equity
Share capital	1,564,499	1,564,499
Share premium	1,440,258	1,440,258
Retained earnings	12,155,420	11,590,916
Accumulated other comprehensive income	86,051	194,934
Other components of equity	(1,234,784)	(1,170,083)
Equity attributable to owners of the Controlling Company	14,011,444	13,620,524
Non-controlling interest	1,539,989	1,520,160
Total equity	15,551,433	15,140,684
Total liabilities and equity	₩ 33,662,545	₩ 34,632,214

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Consolidated Statements of Operations - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Profit or loss [abstract]
Operating revenue	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050
Revenue	24,099,394	24,639,758	23,220,052
Others	341,253	259,431	215,998
Operating expenses	23,418,314	23,872,219	22,335,190
Operating profit	1,022,333	1,026,970	1,100,860
Finance income	498,614	424,395	374,243
Finance costs	(507,383)	(432,133)	(435,659)
Share of net profits of associates and joint ventures	18,041	(3,304)	(5,467)
Profit before income tax	1,031,605	1,015,928	1,033,977
Income tax expense	285,349	320,060	314,565
Profit for the year	746,256	695,868	719,412
Profit for the year attributable to:
Profit (loss) for the year attributable to Owners of the Controlling Company	700,889	645,703	645,571
Profit (loss) for the year attributable to Non-controlling interest	₩ 45,367	₩ 50,165	₩ 73,841
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):
Basic earnings per share	₩ 2,858	₩ 2,634	₩ 2,634
Diluted earnings per share	₩ 2,858	₩ 2,632	₩ 2,634

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Consolidated Statements of Comprehensive Income - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of comprehensive income [abstract]
Profit for the year	₩ 746,256	₩ 695,868	₩ 719,412
Other comprehensive income Items that will not be reclassified to profit or loss:
Remeasurements of the net defined benefit liability	(60,181)	(25,777)	(73,511)
Shares of remeasurement gain (loss) of associates and joint ventures	786	649	(816)
Gain on valuation of equity instruments at fair value through other comprehensive income	51,696	155,319	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	(9,699)	11,833	734
Valuation gain (loss) on cash flow hedge	(84,044)	67,548	17,268
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss)	111,431	(44,684)	(44,279)
Share of other comprehensive income (loss) from associates and joint ventures	15,932	2,517	(41)
Exchange differences on translation of foreign operations	(2,666)	4,933	2,940
Total other comprehensive income (loss)	23,255	172,338	(54,628)
Total comprehensive income for the year	769,511	868,206	664,784
Total comprehensive income for the year attributable to:
Owners of the Controlling Company	727,077	768,341	589,179
Non-controlling interest	₩ 42,434	₩ 99,865	₩ 75,605

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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 (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
Beginning 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
Changes in value of available-for-sale financial assets | Increase (decrease) due to changes in accounting policy required by IFRSs [member]	1,048,922			954,053	17,741		971,794	77,128
Comprehensive income
Profit for the year	719,412			645,571			645,571	73,841
Remeasurements of net defined benefit liabilities	(73,511)			(61,449)			(61,449)	(12,062)
Share of gain on remeasurements of associates and joint ventures	(816)			(816)			(816)
Share of other comprehensive income of associates and joint ventures	(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
Changes 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 (Adjusted [member]) at Dec. 31, 2018	14,654,600	1,564,499	1,440,258	11,252,179	50,158	(1,181,083)	13,126,011	1,528,589
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
Changes in value of available-for-sale financial assets | Increase (decrease) due to changes in accounting policy required by IFRSs [member]	(3,890)			(3,890)			(3,890)
Comprehensive income
Profit for the year	695,868			645,703			645,703	50,165
Remeasurements of net defined benefit liabilities	(25,777)			(22,774)			(22,774)	(3,003)
Share of gain on remeasurements of associates and joint ventures	649			636			636	13
Share of other comprehensive income of associates and joint ventures	2,517				2,427		2,427	90
Valuation gains (losses) on cashflow hedge	22,864				22,850		22,850	14
Gain on valuation of financial instruments at fair value through other comprehensive income	167,152				114,869		114,869	52,283
Exchange differences on translation of foreign operations	4,933				4,630		4,630	303
Total comprehensive income for the year	868,206			623,565	144,776		768,341	99,865
Transactions with equity holders
Dividends paid by the Controlling Company	(269,659)			(269,659)			(269,659)
Dividends paid to non-controlling interest of subsidiaries	(35,500)							(35,500)
Changes in consolidation scope	1,539					(245)	(245)	1,784
Changes in ownership interest in subsidiaries	(83,660)					(9,082)	(9,082)	(74,578)
Appropriation of loss on disposal of treasury stock				(15,169)		15,169
Disposal of treasury stock	3,346					3,346	3,346
Others	1,812					1,812	1,812
Subtotal	(382,122)			(284,828)		11,000	(273,828)	(108,294)
Ending balance at Dec. 31, 2019	15,140,684	1,564,499	1,440,258	11,590,916	194,934	(1,170,083)	13,620,524	1,520,160
Comprehensive income
Profit for the year	746,256			700,889			700,889	45,367
Remeasurements of net defined benefit liabilities	(60,181)			(49,554)			(49,554)	(10,627)
Share of gain on remeasurements of associates and joint ventures	786			410			410	376
Share of other comprehensive income of associates and joint ventures	15,932				14,701		14,701	1,231
Valuation gains (losses) on cashflow hedge	27,387				27,433		27,433	(46)
Gain on valuation of financial instruments at fair value through other comprehensive income	41,997			184,215	(150,135)		34,080	7,917
Exchange differences on translation of foreign operations	(2,666)				(882)		(882)	(1,784)
Total comprehensive income for the year	769,511			835,960	(108,883)		727,077	42,434
Transactions with equity holders
Dividends paid by the Controlling Company	(269,766)			(269,766)			(269,766)
Dividends paid to non-controlling interest of subsidiaries	(40,802)							(40,802)
Changes in ownership interest in subsidiaries	29,825					11,628	11,628	18,197
Appropriation of loss on disposal of treasury stock				(1,690)		1,690
Acquisition of treasury stock	(110,097)					(110,097)	(110,097)
Disposal of treasury stock	33,213					33,213	33,213
Others	(1,135)					(1,135)	(1,135)
Subtotal	(358,762)			(271,456)		(64,701)	(336,157)	(22,605)
Ending balance at Dec. 31, 2020	₩ 15,551,433	₩ 1,564,499	₩ 1,440,258	₩ 12,155,420	₩ 86,051	₩ (1,234,784)	₩ 14,011,444	₩ 1,539,989

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Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Cash generated from operations	₩ 4,745,293	₩ 4,058,065	₩ 4,212,222
Interest paid	(254,852)	(255,908)	(304,428)
Interest received	259,836	276,349	242,951
Dividends received	19,623	18,922	14,074
Income tax paid	(30,073)	(352,255)	(154,355)
Net cash inflow from operating activities	4,739,827	3,745,173	4,010,464
Cash flows from investing activities
Collection of loans	63,435	63,517	64,023
Loans granted	(48,731)	(65,138)	(60,229)
Disposal of financial assets at fair value through profit or loss	528,655	720,148	397,224
Disposal of financial assets at amortized cost	528,746	422,637	255,290
Disposal of financial assets at fair value through other comprehensive income	351,065		2,474
Disposal of assets held-for-sale	83,241	28,834	9,842
Disposal of investments in associates and joint ventures	24	16,930	7,832
Acquisition of investments in associates and joint ventures	(273,411)	(29,980)	(34,420)
Disposal of property and equipment, and investment properties	49,832	42,554	90,992
Acquisition of property and equipment, and investment properties	(3,207,566)	(3,263,338)	(2,260,879)
Acquisition of financial assets at fair value through profit or loss	(521,142)	(793,977)	(158,787)
Acquisition of financial assets at amortized cost	(759,180)	(501,838)	(248,789)
Acquisition of financial assets at fair value through other comprehensive income	(14,092)	(14,277)	(16,239)
Disposal of intangible assets	13,362	12,097	20,037
Disposal of right-of-use assets	2,023	9,393
Discontinued operations	205	1,977
Acquisition of right-of-use assets	(5,824)	(6,236)
Acquisition of intangible assets	(511,094)	(530,775)	(746,213)
Decrease in cash due to business combination, etc.	(41,018)		(26,288)
Net cash outflow from investing activities	(3,761,470)	(3,887,472)	(2,704,130)
Cash flows from financing activities
Proceeds from borrowings and debentures	1,795,221	1,951,568	1,473,016
Repayments of borrowings and debentures	(1,627,354)	(1,377,394)	(1,612,731)
Settlement of derivative assets and liabilities, net	36,594	23,901	(3,461)
Cash outflow from consolidated capital transactions	(1,192)	(122,918)	(5,506)
Cash inflow from other financing activities	35,854	65,698	13,939
Dividends paid to shareholders	(310,567)	(305,159)	(298,632)
Acquisition of treasury stock	(114,683)		(24,415)
Decrease in finance leases liabilities	(447,784)	(485,444)	(73,885)
Decrease in other liabilities	(13,674)
Net cash outflow from financing activities	(647,585)	(249,748)	(531,675)
Effect of exchange rate change on cash and cash equivalents	(2,042)	(5,481)	581
Net increase (decrease) in cash and cash equivalents	328,730	(397,528)	775,240
Cash and cash equivalents at beginning of year	2,305,894	2,703,422	1,928,182
Cash and cash equivalents at end of year	₩ 2,634,624	₩ 2,305,894	₩ 2,703,422

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General Information

12 Months Ended

Dec. 31, 2020

Text block [abstract]

General Information

1. General Information

The consolidated financial statements as of December 31, 2020 include the accounts of KT Corporation, which is the controlling company as defined under IFRS 10, Consolidated Financial Statements, and its 64 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, 2019 and 2020, are as follows:

			Controlling percentage ownership1
Subsidiary	Type of business	Location	December 31, 2019	December 31, 2020	Closing month
KT Powertel Co., Ltd. 2	Trunk Radio System (TRS) business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	92.4%	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.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
KT Strategic Investment Fund No.5	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	100.0%	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	64.5%	64.5%	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) 2,4	Online music production and distribution	Korea	36.0%	36.2%	December
KT MOS Bukbu Co., Ltd. 4	Telecommunication facility maintenance	Korea	100.0%	100.0%	December
KT MOS Nambu Co., Ltd. 4	Telecommunication facility maintenance	Korea	98.4%	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
KTGDH Co., Ltd. (KTSB Data Service)	Data centre development and related service	Korea	100.0%	100.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3,4	Solution provider and IPTV advertisement sales business	Korea	44.0%	44.0%	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 Contents Fund	Content investment business	Korea	88.6%	88.6%	December
Autopion Co., Ltd.	Information and communication service	Korea	100.0%	100.0%	December
KTCS Corporation 2,4	Database and online information provider	Korea	30.9%	31.9%	December
KTIS Corporation 2,4	Database and online information provider	Korea	30.1%	30.8%	December
KT M Mobile Co., Ltd.	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	Korea	100.0%	70.4%	December
Next Connect PFV	Residential building development and supply	Korea	100.0%	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
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.z o.o.	Electronic communication business	Poland	97.2%	97.4%	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
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.6%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hong Kong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December
Texnoprosistem LLC	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Co., Ltd.	Internet advertising solution provider	Thailand	99.9%	99.9%	December
KT Huimangjieum	Manufacturing	Korea	100.0%	100.0%	December
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.	Residential building investment and rent	Korea	63.5%	68.1%	December
K-REALTY RENTAL HOUSING REIT 3	Residential building	Korea	100.0%	88.6%	December
Storywiz Co., Ltd	Content and software development and supply	Korea	—	100.0%	December
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Telecommunication facility construction and maintenance	Korea	—	100.0%	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 2020 are as follows:

Changes	Location	Name of Subsidiary	Reason
Included	Korea	Storywiz Co., Ltd	Newly established
	Korea	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Transferred
Excluded	Uzbekistan	Super iMax LLC	Merged
	Indonesia	PT. KT Indonesia	Liquidated
	Belgium	KT ORS Belgium	Liquidated

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2018, 2019 and 2020, is as follows:

(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
KTGDH Co., Ltd. (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 Co., Ltd.		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.

(In millions of Korean won)	2019
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	118,052	￦	19,766	￦	62,846	￦	3,085
KT Linkus Co., Ltd.		70,494		62,088		97,892		(2,258	)
KT Submarine Co., Ltd.		120,947		18,452		55,244		486
KT Telecop Co., Ltd.		279,878		153,841		332,063		(4,875	)
KT Hitel Co., Ltd.		279,818		74,769		323,065		1,426
KT Service Bukbu Co., Ltd.		64,802		58,984		219,427		(445	)
KT Service Nambu Co., Ltd.		63,917		55,548		266,148		280
BC Card Co., Ltd.1		3,912,982		2,594,232		3,553,008		115,885
H&C Network1		282,016		68,401		320,701		(1,593	)
Nasmedia Co., Ltd.1		356,236		203,105		117,550		22,484
KTDS Co., Ltd.1		158,153		105,462		428,758		9,027
KT M Hows Co., Ltd.		74,326		50,638		33,443		6,771
KT M&S Co., Ltd.		248,142		215,777		813,498		12,732
GENIE Music Corporation (KT Music Corporation)		234,131		80,952		230,480		7,658
KT MOS Bukbu Co., Ltd.		33,376		28,841		63,761		353
KT MOS Nambu Co., Ltd.		34,258		26,722		67,300		3,099
KT Skylife Co., Ltd.1		848,276		142,839		704,996		56,008
KT Estate Inc.1		1,686,000		295,706		485,686		48,552
KTGDH Co., Ltd. (KTSB Data service)		10,437		1,628		3,977		344
KT Sat Co., Ltd.		651,195		127,523		168,376		16,497
KT Sports Co., Ltd.		15,603		8,333		55,241		(464	)
KT Music Contents Fund No.1		10,579		1,677		521		345
KT Music Contents Fund No.2		7,675		279		331		48
KT-Michigan Global Content Fund		11,688		61		248		(1,113	)
Autopion Co., Ltd.		7,460		4,894		5,604		(302	)
KT M mobile Co., Ltd.		135,917		30,603		161,720		(5,580	)
KT Investment Co., Ltd.1		73,463		56,212		13,375		847
KTCS Corporation1		378,171		213,983		944,778		7,597
KTIS Corporation		305,798		137,524		454,561		9,205
Next connect PFV		385,412		24,275		1,590		(5,898	)
Korea Telecom Japan Co., Ltd.1		1,851		2,858		2,891		651
Korea Telecom China Co., Ltd.		879		39		844		192
KT Dutch B.V.		31,003		50		—		(242	)
Super iMax LLC		3,568		5,304		4,604		(631	)
East Telecom LLC1		20,857		16,302		17,186		2,140
Korea Telecom America, Inc.		4,611		537		6,808		572
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		132,461		183,164		18,013		(31,662	)
KT Belgium		93,321		11		—		(64	)
KT ORS Belgium		6,913		14		—		(43	)
KBTO sp.zo.o.		1,767		245		519		(3,457	)
AOS Ltd.2		12,337		3,993		6,982		(591	)
KT Hongkong Telecommunications Co., Ltd.		5,126		2,923		13,321		586
KT Huimangjieum		2,129		1,019		1,027		(390	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		6,285		1,139		176		70
K-REALTY RENTAL HOUSING REIT 3		300		—		—		—

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.

(In millions of Korean won)	2020
	Total assets		Total liabilities		Operating revenues			Profit (loss) for the year
KT Powertel Co., Ltd.	￦	119,694	￦	18,833	￦	65,897		￦	3,809
KT Linkus Co., Ltd.		58,372		54,022		84,519			(3,212	)
KT Submarine Co., Ltd.		116,813		14,032		110,201			1,197
KT Telecop Co., Ltd.		318,456		193,737		392,489			212
KT Hitel Co., Ltd.		288,949		92,599		350,231			2,080
KT Service Bukbu Co., Ltd.		60,825		56,554		217,451			(871	)
KT Service Nambu Co., Ltd.		58,182		51,460		264,776			(456	)
BC Card Co., Ltd. 1		3,084,398		1,778,751		3,387,640			39,455
H&C Network 1		269,651		61,365		322,690			2,413
Nasmedia Co., Ltd. 1		422,039		221,371		113,136			23,134
KTDS Co., Ltd. 1		183,297		133,129		499,990			10,635
KT M Hows Co., Ltd.		104,704		76,315		44,860			6,935
KT M&S Co., Ltd.		231,260		197,306		661,533			(485	)
GENIE Music Corporation (KT Music Corporation)		250,538		88,488		247,237			9,472
KT MOS Bukbu Co., Ltd.		32,167		26,070		67,975			1,473
KT MOS Nambu Co., Ltd.		33,765		24,947		71,259			1,639
KT Skylife Co., Ltd. 1		919,476		175,039		706,631			58,190
KT Estate Inc. 1		1,689,601		325,429		365,335			14,370
KTGDH Co., Ltd. (KTSB Data Service)		11,003		1,669		4,282			538
KT Sat Co., Ltd.		630,740		92,791		173,693			14,753
KT Sports Co., Ltd.		26,572		14,940		46,608			(2,516	)
KT Music Contents Fund No.1		4,844		1,525		243			84
KT Music Contents Fund No.2		15,021		285		169			(116	)
KT-Michigan Global Contents Fund		10,382		175		111			(1,420	)
Autopion Co., Ltd.		4,903		4,961		6,174			(2,459	)
KT M Mobile Co., Ltd.		129,011		27,281		163,472			(3,617	)
KT Investment Co., Ltd. 1		115,627		93,695		47,801			4,680
KTCS Corporation 1		384,919		215,175		933,006			11,323
KTIS Corporation		294,289		126,894		454,172			7,387
Next Connect PFV		394,268		37,271		26			(7,101	)
Korea Telecom Japan Co., Ltd. 1		2,694		2,622		1,853			1
Korea Telecom China Co., Ltd.		381		21		618			(492	)
KT Dutch B.V. 1		29,585		10,109		26,782			6,061
Korea Telecom America, Inc.		4,498		125		6,808			712
KT Rwanda Networks Ltd. 2		114,768		191,781		17,870			(34,610	)
KT Belgium		87,608		—		(81	)		(81	)
KBTO sp.z o.o.		438		117		490			(2,823	)
AOS Ltd. 2		11,812		3,875		5,719			296
KT Hong Kong Telecommunications Co., Ltd.		6,159		2,800		16,386			1,308
KT Huimangjieum		3,720		2,787		5,239			(13	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		5,703		1,165		333			83
Storywiz Co., Ltd		21,594		10,065		19,209			(1,954	)
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)		138,220		102,963		346,040			(8,461	)

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, 2020

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 financial statements have been prepared on a historical cost basis, except for the following:

• Certain financial assets and liabilities (including derivative instruments) – measured at fair value

• Assets held-for-sale – measured at fair value less costs to sell

• Defined benefit pension plans – plan assets measured at fair value

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.

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, 2020.

- Amendments to IAS 1 Presentation of Financial Statements and IAS 8 Accounting policies, changes in accounting estimates and errors – Definition of Material

The amendments clarify the definition of material. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that the primary users of general-purpose financial statements make on the basis of those financial statements. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 3 Business Combination – Definition of a Business

The amended definition of a business requires an acquisition to include an input and a substantive process that together significantly contribute to the ability to create outputs and the definition of output excludes the returns in the form of lower costs and other economic benefits. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, an entity may elect to apply an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement and IFRS 7 Financial Instruments: Disclosure – Interest Rate Benchmark Reform

The amendments allow to apply the exceptions when forward-looking analysis is performed in relation the application of hedge accounting, while uncertainties arising from interest rate benchmark reform exist. The exceptions require the Group assumes that the interest rate benchmark, on which the hedged items and the hedging instruments are based on, is not altered as a result of interest rate benchmark reform, when determining whether the expected cash flows are highly probable, whether an economic relationship between the hedged item and the hedging instrument exists, and when assessing the hedging relationship is highly effective.

The Group’s risk exposure, directly affected by the interest rate benchmark reform, is the variable rate borrowings of USD 519,598,989 and SGD 284,000,000 with maximum remaining maturity of four years. To hedge fluctuations in cash flows of borrowings resulting from the changes in USD LIBOR of 3 months and SGD SOR of 6 months—an interest rate benchmark, the Group entered into an interest rate swap contract for a nominal amount of USD 519,598,989 and SGD 284,000,000 and designated it as a hedging instrument of cash flow hedge.

- Agenda Decision of the International Accounting Standards Interpretations Committee – Lease Period

The IFRS Interpretations Committee (IFRS IC) announced on December 16, 2019 that all economic penalties resulting from the termination of a lease are taken into account when determining the enforceable period for ‘Lease Term and Useful Life of Leasehold Improvements’. The Group’s changes in accounting policy have been adopted retrospectively in accordance with IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, and the comparative financial statements as at December 31, 2019 and for the year then ended have been adjusted (Note 41).

(2) New standards and interpretations not yet adopted by the Group

The following new accounting standards and interpretations have been published that are not mandatory for December 31, 2020 reporting periods and have not been early adopted by the Group.

- Amendments to IFRS 16 Lease – Practical expedient for COVID-19—Related Rent Exemption, Concessions, Suspension

As a practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 pandemic is a lease modification, and the amounts recognized in profit or loss as a result of applying this exemption should be disclosed. The amendments should be applied for annual periods beginning on or after June 1, 2020, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement, IFRS 7 Financial Instruments: Disclosure, IFRS 4 Insurance Contracts and IFRS 16 Lease – Interest Rate Benchmark Reform

In relation to interest rate benchmark reform, the amendments provide exceptions including adjust effective interest rate instead of book amounts when interest rate benchmark of financial instruments at amortized costs is replaced, and apply hedge accounting without discontinuance although the interest rate benchmark is replaced in hedging relationship. The amendments should be applied for annual periods beginning on or after January 1, 2021, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IFRS 3 Business Combination – Reference to the Conceptual Framework

The amendments update a reference of definition of assets and liabilities qualify for recognition in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS 37 Provisions, Contingent Liabilities and Contingent Assets, and IFRIC 21 Levies. The amendments also confirm that contingent assets should not be recognized at the acquisition date. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IAS 16 Property, Plant and Equipment—Proceeds Before Intended Use

The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IAS 37 Provisions, Contingent Liabilities and Contingent Assets—Onerous Contracts: Cost of Fulfilling a Contract

The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Annual improvements to IFRS 2018-2020

Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

• IFRS 1 First time Adoption of Korean International Financial Reporting Standards – Subsidiaries that are first-time adopters

• IFRS 9 Financial Instruments – Fees related to the 10% test for derecognition of financial liabilities

• IFRS 16 Leases – Lease incentives

• IAS 41 Agriculture – Measuring fair value

- Amendments to IAS 1 Presentation of Financial Statements—Classification of Liabilities as Current or Non-Current

The amendments clarify that liabilities are classified as either current or non-current, depending on the substantive rights that exist at the end of the reporting period. Classification is unaffected by the likelihood that an entity will exercise right to defer settlement of the liability or the expectations of management. Also, the settlement of liability include the transfer of the entity’s own equity instruments, however, it would be excluded if an option to settle them by the entity’s own equity instruments if compound financial instruments meets the definition of equity instruments and is recognized separately from the liability. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

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 entities over which the Group has significant influence but does not possess control or joint control. Investments in associates are accounted for using the equity method of accounting, after initially being recognized at cost. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If the Group’s share of losses of an associate equals or exceeds its interest in the associate (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associate. If there is an objective evidence of impairment for the investment in the associate, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss. If an associate uses accounting policies other than those of the Group for transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associate’s accounting policies conform to those of the Group when the associate’s financial statements are used by the Group in applying the equity method.

(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 that relate to borrowings are presented in the consolidated statements of operations, within finance costs. All other foreign exchange gains and losses are presented in the consolidated statements of operations within operating revenue or operating expenses.

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 consolidated statements of operations 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 comprise cash balances, call deposits and investment securities with

maturities of three months or less from the acquisition date that are easily convertible to cash and

subject to an insignificant risk of changes in their fair value.

2.7 Financial Assets

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, the Group recorded the cumulative effect as at the date of the initial application of the standards as an adjustment to the initial balance in the retained earnings.

(1) Classification

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 consolidated statements of operations 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 consolidated statements of operations 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 the amount of consideration that is unconditional, unless they contain significant financing components when they are recognized at fair value. Trade receivables are 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.

2.11 Assets (or Disposal Group) Held-for-sale

Assets(or disposal group) are classified as assets held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continued use and when a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less selling costs.

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 are directly attributable to the acquisition of the items.

Depreciation of all property 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 (1) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested at least 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 at least 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	4 – 6 years
Frequency usage rights	5 – 10 years
Others1	1 – 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 consolidated statements of operations.

2.17  Impairment of Non-Financial Assets

Goodwill and intangible assets with indefinite useful life are tested at least annually for impairment at the end of each reporting period. If certain assets are deemed to be impaired, their recoverable amount is estimated in order to determine the impairment loss. The Group estimates the recoverable amount for each asset, and in cases when the recoverable amount cannot be estimated for an asset, the recoverable amount of the cash generating unit to which the asset belongs is estimated. Corporate assets are allocated to individual cash generating units on a reasonable and consistent basis and if they cannot be allocated to individual cash generating units, they are allocated to the smallest group of cash generating units on a reasonable and consistent basis. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount (higher of its fair value less costs of disposal and value in use). Impairment loss on non-financial assets other than goodwill are evaluated for reversal 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 measured 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.

All non-derivative financial liabilities except the following are classified as financial liabilities measured at amortized cost.

• Financial liabilities at fair value through profit or loss

• Financial guarantee contract

• Financial liabilities arising when the transfer of financial assets does not meet the elimination conditions

Financial liabilities measured at amortized cost are displayed in the statement of financial position as ‘Trade and other payables’, ‘Borrowings’ and ‘Other financial liabilities’.

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 consolidated statements of operations 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 they are 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

• 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 at least 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 at least 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, recoveries, litigations and claims, and others are recognized when the Group presently hold legal or constructive obligation as a result of past events, and when 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

As at January 1, 2019, with implementation of IFRS 16 Leases, the Group has changed accounting policy. The Group has adopted IFRS 16 modified retrospectively, as permitted under the specific transitional provisions in the standard, and recognized the cumulative impact of initially applying the standard as at January 1, 2019.

As explained in “Note 2.2 (1)” above, the Group has changed its accounting policy for leases. The impact of the new accounting policies is disclosed in Note 41.

(1) Lessee

The Group leases various repeater server rack, offices, track facilities, machinery and cars.

Contracts may contain both lease and non-lease components. The Group allocates the consideration in the contract to the lease and non-lease components based on their relative stand-alone prices. However, for leases of real estate for which the Group is lessee, the Group applies the practical expedient which has elected not to separate lease and non-lease components and instead accounts them as a single lease component.

Assets and liabilities arising from a lease are initially measured on a present value basis. Lease liabilities include the net present value of the following lease payments:

• Fixed payments (including in-substance fixed payments), less any lease incentives receivable

• Variable lease payment that are based on an index or a rate, initially measured using the index or rate as at the commencement date

• Amounts expected to be payable by the Group (the lessee) under residual value guarantees

• The exercise price of a purchase option if the Group (the lessee) is reasonably certain to exercise that option, and

• Payments of penalties for terminating the lease, if the lease term reflects the Group (the lessee) exercising that option

Lease liability measurement also include payments to be made in option periods if the lessee is reasonably certain in exercising an option to extend the lease.

The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable.

The lease payments are discounted using the interest rate implicit in the lease. If that rate cannot be determined, the lessee’s incremental borrowing rate is used, which is the rate that the lessee would have to pay to borrow the funds necessary to obtain an asset of similar value in a similar economic environment with similar terms and conditions.

The Group is exposed to potential future increases in variable lease payments based on an index or rate, which are not included in the lease liability until they take effect. When adjustments to lease payments based on an index or rate take effect, the lease liability is reassessed and adjusted against the right-of-use asset.

Each lease payment is allocated between the liability and finance cost. The finance cost is charged to profit or loss over the lease period in order to produce a constant periodic rate of interest on the remaining balance of the liability for each period.

Right-of-use assets are measured at cost comprising the following:

• amount of the initial measurement of lease liability

• any lease payments made at or before the commencement date less any lease incentives received

• any initial direct costs (leasehold deposits)

• restoration costs, and

• present value discount on leasehold deposit

The right-of-use asset is depreciated over the shorter of the asset’s useful life and the lease term on a straight-line basis. If the Group is reasonably certain to exercise a purchase option, the right-of-use asset is depreciated over the underlying asset’s useful life.

Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less, such as mechanical devices and cars. Low-value assets are comprised of tools, equipment, and others.

(2) Lessor

Lease income from operating leases where the Group is a lessor is recognized in income on a straight- line basis over the lease term. Initial direct costs incurred in obtaining an operating lease are added to the carrying amount of the underlying asset and recognized as expense over the lease term on the same basis as lease income. The respective leased assets are included in the statement of financial position based on their nature.

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 modified 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 modified 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 are considered a separate performance obligations. 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 profit.

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, 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 fees 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 for 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 liabilities are offset when the Group has a legally enforceable right to offset and intends either to settle on a net basis, or to realize the assets and settle the liability simultaneously.

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 consolidated financial statements in the period in which the dividends are approved by the Group’s shareholders.

2.29 Approval of the Consolidated Financial Statements

The consolidated financial statements for 2020 were approved for issuance by the Board of Directors on April 13, 2021.  

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Critical Accounting Estimates and Assumptions

12 Months Ended

Dec. 31, 2020

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Critical Accounting Estimates and Assumptions

3. Critical Accounting Estimates and Assumptions

The Group makes estimates and assumptions concerning the future. The estimates and assumptions are continuously evaluated and are based on historical experience and other factors, including expectations of future events that are believed to be reasonable under the current circumstances. Actual results may differ from these estimates.

During 2020, the spread of Coronavirus disease 2019 (“COVID-19”) had a material impact on the global economy. It may have a negative impact; such as, decrease in productivity, decrease or delay in sales, collection of existing receivables and others. Accordingly, it may have a negative impact on the financial position and financial performance of the Group.

Significant accounting estimates and assumptions applied in the preparation of the consolidated financial statements can be adjusted depending on changes in the uncertainty from COVID-19. Also, the ultimate effect of COVID-19 to the Group’s business, financial position and financial performance cannot presently be determined.

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 Impairment of Non-Financial Assets (including Goodwill)

The Group determines the recoverable amount of a cash generating unit (CGU) based on fair value or value-in-use calculations assess non-financial assets (including goodwill) for impairment (Note 13).

3.2 Income Taxes

The Group’s taxable income generated from these operations are subject to income taxes based on tax laws and interpretations of tax authorities in numerous jurisdictions. There are many transactions and calculations for which the ultimate tax determination is uncertain (Note 29).

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 (Note 36).

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. 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 and golf club memberships 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.

3.9 Lease Term

In determining the lease term, management considers the facts and circumstances that create an economic incentive to exercise an extension option, or not exercise a termination option. Extension options (or periods after termination options) are only included in the lease term if the lease is reasonably certain to be extended (or not terminated).

For leases of property, machinery and communication line facilities, the following factors are normally the most relevant:

• If there are significant penalties to terminate (or not extend), the Group is typically reasonably certain to extend (or not terminate).

• If any leasehold improvements are expected to have a significant remaining value, the Group is typically reasonably certain to extend (or not terminate).

• Otherwise, the Group considers other factors including historical lease durations and the costs and business disruption required to replace the leased asset.

Most extension options in offices, retail stores and vehicles leases have not been included in the lease liability, because the Group could replace the assets without significant cost or business disruption.

The lease term is reassessed if an option is actually exercised (or not exercised) or the Group becomes obliged to exercise (or not exercise) it. The assessment of reasonable certainty is only revised if a significant event or a significant change in circumstances occurs, which affects this assessment, and that is within the control of the lessee.

Details on the current period’s financial impact from changes in accounting policies, to reflect exercising extension and termination options, are disclosed in Note 41.

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Financial Instruments by Category

12 Months Ended

Dec. 31, 2020

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Financial Instruments by Category

4. Financial Instruments by Category

Financial instruments by category as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
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	￦	2,305,894	￦	—	￦	—	￦	—	￦	2,305,894
Trade and other receivables1		5,748,459		—		1,256,266		—		7,004,725
Other financial assets		441,804		632,324		557,342		58,576		1,690,046

1 Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2019
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	￦	8,679,698	￦	—	￦	—	￦	8,679,698
Borrowings		7,298,867		—		—		7,298,867
Other financial liabilities		129,945		38		20,096		150,079

(In millions of Korean won)	December 31, 2020
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	￦	2,634,624	￦	—	￦	—	￦	—	￦	2,634,624
Trade and other receivables1		4,976,423		—		1,118,619		—		6,095,042
Other financial assets		671,068		809,919		258,516		7,684		1,747,187

1 Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2020
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	￦	7,017,639	￦	—	￦	—	￦	7,017,639
Borrowings		7,316,298		—		—		7,316,298
Other financial liabilities		132,558		2,682		127,929		263,169

Gains or losses arising from financial instruments by category for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Financial assets at amortized cost
Interest income1,5	￦	93,233		￦	79,838		￦	55,742
Gain(loss) on foreign currency transaction4		19,396			32,293			(19,244	)
Loss on foreign currency translation4		(2,901	)		(474	)		(3,895	)
Gain(loss) on disposal		44			(43	)		138
Loss on valuation		(110,544	)		(59,947	)		(140,474	)
Financial assets at fair value through profit or loss
Interest income1		9,194			5,634			6,548
Dividend income6		1,207			1,096			4,379
Gain on valuation7		10,768			4,334			59,044
Gain on disposal		1,713			5,115			(329	)
Loss on foreign currency transaction4		—			—			(38	)
Loss on foreign currency translation4		—			(27	)		—
Financial assets at fair value through other comprehensive income
Interest income1		163,390			217,355			227,736
Dividend income6		1,704			2,312			56
Impairment loss		(2,416	)		(304	)		—
Loss on disposal		(13,818	)		(11,247	)		(8,152	)
Other comprehensive income for the year2		43,811			167,152			41,997
Derivative assets used for hedging
Gain on transaction		7,272			6,332			6,050
Gain(loss) on valuation		22,065			56,537			(2,707	)
Other comprehensive income(loss) for the year2		20,078			46,806			(2,373	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(15,891	)		(39,604	)		3,645
Financial liabilities at fair value through profit or loss
Gain on disposal		—			2,664			799
Gain(loss) on valuation		(2,708	)		(1,936	)		119
Derivative liabilities used for hedging
Gain on transactions		20,678			—			1,141
Gain(loss) on valuation		42,195			4,949			(161,003	)
Other comprehensive income for the year2		(2,810	)		20,742			(81,671	)
Reclassified to profit or loss from other comprehensive income for the year 2,3		(28,388	)		(5,080	)		107,786
Financial liabilities at amortized cost
Interest expense1,5		(296,894	)		(223,974	)		(220,945	)
Loss on repayment		(15	)		—			—
Loss on foreign currency transaction4		(30,956	)		(20,958	)		(10,717	)
Gain(loss) on foreign currency translation4		(66,050	)		(75,502	)		141,849
Total	￦	(116,643	)	￦	214,063		￦	5,481

1 BC Card, a subsidiary of the Group, recognized interest income and expense as operating revenue and expense, respectively. Related interest income recognized as operating revenue is ￦ 20,854 million (2018: ￦ 21,021 million, 2019: ￦ 21,018 million) and interest expense recognized as operating expense is ￦ 1,456 million (2018: ￦ 21 million, 2019: ￦ 548 million) for the year ended December 31, 2020.

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 Co., Ltd., a subsidiary of the Group recognized foreign currency translation/transaction gain and loss and as operating income and expenses. In relation to this, foreign currency translation gain and loss recognized as operating revenue and expense amount to ￦ 56 million (2018: ￦ 0 million. 2019: ￦ 5 million) and ￦ 19,687 million (2018: ￦ 20,422 million, 2019: ￦ 17,006 million), respectively, for the year ended December 31, 2020.

5 Interest income (interest expense) from lease receivables (lease liabilities) is excluded as it is not subject to classification of financial instruments (Note 21).

6 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ 2,059 million (2018: ￦ 1,598 million, 2019: ￦ 2,250 million) for the year ended December 31, 2020.

7 KT Investment Co., Ltd., etc., subsidiaries of the Group, recognized financial instruments measured at fair value through profit or loss as operating income and expenses. In relation to this, valuation gain and loss recognized as operating revenue and expense amount to ￦ 40,822 million (2018: ￦ (-) 5 million, 2019: ￦ 15,429 million), for the year ended December 31, 2020.

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Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2020

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Cash and Cash Equivalents

5. Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019	December 31, 2020	Description
Bank deposits	￦21,290	￦28,414	Deposit restricted for government 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, 2020

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Trade and Other Receivables

6. Trade and Other Receivables

Trade and other receivables as at December 31, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,451,107	￦	(291,202	)	￦	(9,510	)	￦	3,150,395
Other receivables		2,787,144		(78,572	)		(271	)		2,708,301
	￦	6,238,251	￦	(369,774	)	￦	(9,781	)	￦	5,858,696
Non-current assets
Trade receivables	￦	874,860	￦	(4,117	)	￦	(43,597	)	￦	827,146
Other receivables		382,468		(5,108	)		(22,708	)		354,652
	￦	1,257,328	￦	(9,225	)	￦	(66,305	)	￦	1,181,798

	December 31, 2020
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,388,099	￦	(322,992	)	￦	(8,977	)	￦	3,056,130
Other receivables		1,948,108		(101,619	)		(148	)		1,846,341
	￦	5,336,207	￦	(424,611	)	￦	(9,125	)	￦	4,902,471
Non-current assets
Trade receivables	￦	892,992	￦	(4,323	)	￦	(34,716	)	￦	853,953
Other receivables		513,926		(102,985	)		(14,125	)		396,816
	￦	1,406,918	￦	(107,308	)	￦	(48,841	)	￦	1,250,769

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 provision for impairment for the years ended December 31, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	359,924		￦	93,822		￦	295,319		￦	83,680
Provision		24,596			35,597			89,097			50,860
Reversal		—			(475	)		—			(890	)
Written-off or transfer out		(90,513	)		(44,108	)		(60,598	)		(25,067	)
Change in consolidation scope		—			—			3,211			87,614
Others		1,312			(1,156	)		286			8,407
Ending balance	￦	295,319		￦	83,680		￦	327,315		￦	204,604

Provisions for impairment on trade and other receivables are recognized as operating expenses and finance costs.

Details of other receivables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Loans	￦	84,148		￦	116,082
Receivables1		2,540,315			1,699,608
Accrued income		8,630			6,901
Refundable deposits		352,293			350,180
Loans receivable		105,961			150,527
Finance lease receivables		39,726			64,047
Others		15,560			60,416
Less: Provision for impairment		(83,680	)		(204,604	)
	￦	3,062,953		￦	2,243,157

1 Settlement receivables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 986,384 million related to debit and credit card transactions are included as at December 31, 2020 (2019: ￦ 1,786,610 million).

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, 2020.

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, 2020

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other financial assets
Financial assets at amortized cost1	￦	441,804		￦	671,068
Financial assets at fair value through profit or loss1,2,3		632,324			809,919
Financial assets at fair value through other comprehensive income1,3		557,342			258,516
Derivative used for hedging		58,576			7,684
Less: Non-current		(821,658	)		(544,347	)
Current	￦	868,388		￦	1,202,840
Other financial liabilities
Financial liabilities at amortized cost	￦	129,945		￦	132,558
Financial liabilities at fair value through profit or loss		38			2,682
Derivatives used for hedging		20,096			127,929
Less: Non-current		(149,136	)		(260,676	)
Current	￦	943		￦	2,493

1 As at December 31, 2020, the Group’s other financial assets amounting to ￦ 104,442 million (2019: ￦ 91,445 million), which consist of checking account deposits and payment guarantee, are subject to withdrawal restrictions.

2 As at December 31, 2020, MMW (Money Market Wrap) and MMT (Money Market Trust) amounting to ￦ 509,068 million (2019: ￦ 406,062 million) is included in other financial assets.

3 As at December 31, 2020, the Group provided investments in Korea Software Financial Cooperative amounting to ￦ 5,491 million (2019: ￦ 1,849 million) as a collateral for the payment guarantee provided by the Cooperative.

Details of financial assets at fair value through profit or loss as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	232		￦	46,449
Equity Instruments (Unlisted)		90,357			83,017
Debt securities		541,657			680,453
Derivatives held for trading		78			—
Total		632,324			809,919
Less: non-current		(219,026	)		(276,109	)
Current	￦	413,298		￦	533,810

The maximum exposure of debt instruments of financial assets recognized at fair value through profit or loss to credit risk is the carrying amount as at December 31, 2020.

Details of financial assets at fair value through other comprehensive income as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	6,738		￦	6,216
Equity Instruments (Unlisted)		543,518			245,730
Debt securities		7,086			6,570
Total		557,342			258,516
Less: non-current		(556,147	)		(258,516	)
Current	￦	1,195		￦	—

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.

In 2020, the Group disposed shares of Mastercard Inc. amounting to ￦ 350,777 million at fair value. Upon disposal, ￦ 265,087 million is reclassified as accumulated other comprehensive income after tax and ￦ 184,330 million is reclassified as retained earnings of attributable to owners of the controlling company.

Derivatives used for hedging as at December 31, 2019 and 2020, are as follows:

	December 31, 2019						December 31, 2020
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	1,464		￦	—		￦	1,078
Currency swap2		55,569			18,632			7,684			126,189
Currency forwards3		3,007			—			—			662
Total		58,576			20,096			7,684			127,929
Less: non-current		(28,304	)		(19,177	)		(2,111	)		(126,408	)
Current	￦	30,272		￦	919		￦	5,573		￦	1,521

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the borrowings.

2 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings. 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, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018						2019						2020
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	￦	192	￦	—	￦	(488)	￦	—	￦	45	￦	(963)	￦	—	￦	—	￦	(567)
Currency swap		58,912		2,045		22,139		72,417		15,784		87,626		—		161,661		(113,175	)
Currency forwards		7,201		—		—		4,858		—		4,858		—		2,049		—
Total	￦	66,305	￦	2,045	￦	21,651	￦	77,275	￦	15,829	￦	91,521	￦	—	￦	163,710	￦	(113,742)

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 loss of ￦ 2,711 million for the current period (2018: valuation gain of ￦ 263 million, 2019: valuation gain of ￦ 4,181 million).

The unsettled amount of derivative instruments for the years ended December 31, 2020 and 2019, are as follows:

(i) Hedging instruments

(In millions of Korean won and thousands of foreign currencies)	2019
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,574,068	￦	1,788,831	￦	30,175	￦	10,692	￦	49,480
JPY		80,000,000		827,292		28,401		9,404		15,396
Total			￦	2,616,123	￦	58,576	￦	20,096	￦	64,876

(In millions of Korean won and thousands of foreign currencies)	2020
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,768,912	￦	2,037,568	￦	2,111	￦	100,623	￦	(136,852	)
JPY		46,000,000		488,924		5,573		13,839		(4,065	)
SGD		284,000		245,208		—		13,467		(13,611	)
Total			￦	2,771,700	￦	7,684	￦	127,929	￦	(154,528	)

(ii) Hedged item

(In millions of Korean won)
	2019								2020
Currency	Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges			Cash flow hedge reserves1			Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges		Cash flow hedge reserves1
USD	￦	1,822,477	￦	(45,855	)	￦	(5,214	)	￦	1,924,576	￦	133,978	￦	19,641
JPY		850,776		(14,841	)		(2,395	)		484,960		4,228		(2,569	)
SGD		—		—			—			233,510		13,611		2,707
Total	￦	2,673,253	￦	(60,696	)	￦	(7,609	)	￦	2,643,046	￦	151,817	￦	19,779

1 The amounts after adjustments of deferred income tax directly reflected in equity.

Details of financial liabilities at fair value through profit or loss as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	38	￦	45
Conversion Rights and Redemption Rights		—		2,637
Total	￦	38	￦	2,682

The valuation gain and loss on financial liabilities at fair value through profit or loss for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018				2019				2020
(In millions of Korean won)	Valuation gain		Valuation loss		Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	2,707	￦	78	￦	2,014	￦	10	￦	53
Conversion Rights and Redemption Rights		—		—		—		—		162		—
Total	￦	—	￦	2,707	￦	78	￦	2,014	￦	172	￦	53

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Inventories

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Inventories

8. Inventories

Inventories as at December 31, 2019 and 2020, are as follows:

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	805,691	￦	(144,438	)	￦	661,253	￦	650,856	￦	(133,224	)	￦	517,632
Others		130,424		—			130,424		17,004		—			17,004
Total	￦	936,115	￦	(144,438	)	￦	791,677	￦	667,860	￦	(133,224	)	￦	534,636

Cost of inventories recognized as expenses for year ended December 31, 2020, amounts to ￦ 3,938,842 million (2018: ￦ 3,926,199 million, 2019: ￦ 3,905,630 million) and reversal of valuation loss on inventory recognized amounts to ￦ 11,214 million for year ended December 31, 2020 (2018: valuation loss on inventory amounts to ￦ 55,288 million, 2019: valuation loss on inventory amounts to ￦ 30,857 million,).

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Other Assets and Liabilities

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Other Assets and Liabilities

9. Other Assets and Liabilities

Other assets and liabilities as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other assets
Advance payments	￦	179,475		￦	168,302
Prepaid expenses		84,768			66,578
Contract cost1		1,849,243			1,804,948
Contract assets1		557,041			586,438
Others		14,243			18,747
Less: Non-current		(685,488	)		(768,661	)
Current	￦	1,999,282		￦	1,876,352
Other liabilities
Advances received1	￦	333,342		￦	328,491
Withholdings		99,844			105,415
Unearned revenue1		65,228			29,593
Lease liabilities		1,211,352			1,143,640
Contract liabilities1		365,610			384,133
Others		23,298			21,597
Less: Non-current		(1,030,117	)		(909,570	)
Current	￦	1,068,557		￦	1,103,299

1 The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

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Assets Held for Sale

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Assets Held for Sale

10. Assets Held for Sale

For the year ended December 31, 2020, the Group decided to sell certain real estate and classified it as assets held for sale. Details of assets held for sale are as follows:

(In millions of Korean won)	Amount
Land	￦	172
Buildings and Other		1,026
Total	￦	1,198

Consideration for sale is expected to exceed the carrying amount of net assets, and as a result, no impairment was recognized for the segment classified as held for sale.

During the prior period, the Group decided to sell some real estate, in which the amount of ￦ 82,865 million was classified as assets held for sale and was sold in the current year.

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Property and Equipment

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Property and Equipment

11. Property and Equipment

Changes in property and equipment for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
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	)
Beginning, net		1,281,187			2,007,685			8,475,016			478,381			825,988			13,068,257
Changes in accounting policy1		—			(149	)		(12,947	)		(196,932	)		—			(210,028	)
Acquisition and capital expenditure		338			4,523			205,359			64,072			3,419,136			3,693,428
Disposal and termination		(1,352	)		(4,213	)		(76,457	)		(4,109	)		(1,362	)		(87,493	)
Depreciation		—			(134,350	)		(2,278,286	)		(89,940	)		—			(2,502,576	)
Impairment		—			(32	)		(41,450	)		(1,751	)		(27	)		(43,260	)
Transfer in (out)		126,066			270,980			2,742,671			16,218			(3,217,044	)		(61,109	)
Transfer to investment properties		(33,254	)		(8,081	)		—			—			—			(41,335	)
Transfer to assets held-for-sale		(89,330	)		(1,121	)		—			—			—			(90,451	)
Others		(21,474	)		26,822			79,345			1,596			(26,423	)		59,866
Ending, net	￦	1,262,181		￦	2,162,064		￦	9,093,251		￦	267,535		￦	1,000,268		￦	13,785,299
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)

1 With the application of IFRS 16, property and equipment were reclassified to right-of-use assets.

	2020
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)
Beginning, net		1,262,181			2,162,064			9,093,251			267,535			1,000,268			13,785,299
Acquisition and capital expenditure		25,156			7,249			112,085			47,669			2,959,690			3,151,849
Disposal and termination		(1,756	)		(3,367	)		(69,401	)		(3,385	)		(1,027	)		(78,936	)
Depreciation		—			(135,646	)		(2,343,965	)		(91,164	)		—			(2,570,775	)
Impairment		—			(36	)		(35,271	)		(44,468	)		—			(79,775	)
Transfer in (out)		53,238			283,937			2,489,138			28,024			(2,899,197	)		(44,860	)
Transfer to investment properties		6,792			(8,848	)		—			—			—			(2,056	)
Changes in scope of consolidation		56			494			225			43			—			818
Others		(11,040	)		2,175			68,921			1,398			(16,899	)		44,555
Ending, net	￦	1,334,627		￦	2,308,022		￦	9,314,983		￦	205,652		￦	1,042,835		￦	14,206,119
Acquisition cost	￦	1,334,759		￦	4,402,691		￦	39,182,265		￦	1,619,822		￦	1,046,795	￦		47,586,332
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(2,094,669	)		(29,867,282	)		(1,414,170	)		(3,960	)		(33,380,213	)

Details of property and equipment provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	17,097	￦	18,705		Borrowings	￦	4,347	Industrial Bank of Korea, Korea Development Bank , K Bank, Inc.
Others	￦	45,851	￦	41,681		Borrowings	￦	3,473	Shinhan Bank

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	11,644	￦	15,502		Borrowings	￦	3,072	Industrial Bank of Korea, Korea Development Bank
	￦	4,142	￦	249		Deposits	￦	249	K Bank, Inc.

The borrowing costs capitalized for qualifying assets amount to ￦ 8,452 million (2019: ￦ 6,360) in 2020. The interest rate applied to calculate the capitalized borrowing costs in 2020 is 2.36% (2019: 2.63%).

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Investment Properties

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Investment Properties

12. Investment Properties

Changes in investment properties for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	350,417		￦	1,168,379		￦	121	￦	1,518,917
Less: Accumulated depreciation		(1,569	)		(426,264	)		—		(427,833	)
Beginning, net	￦	348,848		￦	742,115		￦	121	￦	1,091,084
Changes in accounting policy 1		—			46,666			—		46,666
Acquisition		148,511			103,774			1,781		254,066
Disposal and termination		(285	)		(1,408	)		—		(1,693	)
Depreciation		—			(65,178	)		—		(65,178	)
Transfer from property and equipment		33,254			8,081			—		41,335
Transfer and others		23,268			(2,118	)		—		21,150
Ending, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(491,586	)		—		(493,154	)

1 With the application of IFRS 16, right-of-use-assets were partially reclassified to investment properties.

(In millions of Korean won)	2020
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation		(1,568	)		(491,586	)		—		(493,154	)
Beginning, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition		11,723			7,096			34,243		53,062
Disposal and termination		(1,536	)		(243	)		—		(1,779	)
Depreciation		—			(64,531	)		—		(64,531	)
Transfer from property and equipment		(6,792	)		8,848			—		2,056
Transfer and others		(18,656	)		469			10,402		(7,785	)
Ending, net	￦	538,335		￦	783,571		￦	46,547	￦	1,368,453
Acquisition cost	￦	539,903		￦	1,341,326		￦	46,547	￦	1,927,776
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(557,755	)		—		(559,323	)

The fair value of investment properties is ￦ 2,645,482 million as at December 31, 2020 (December 31, 2019: ￦ 2,304,583 million). The fair value of investment properties is estimated based on the expected cash flow.

Rental income from investment properties is ￦ 203,763 million in 2020 (2019: ￦ 198,636 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.

As at December 31, 2020, the Group (Lessor) has entered into a non-cancellable operating lease contract relating to real estate lease. The future minimum lease fee under this contract is ￦ 50,769 million for one year or less, ￦ 92,728 million more than one year and less than five years, ￦ 78,435 million over five years, and ￦ 221,932 million in total.

Details of investment properties provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	854,874	￦	62,896	Deposits	￦	56,831
Land and Buildings	￦	1,915	￦	3,044	Borrowings	￦	1,903

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	790,414	￦	62,968	Deposits	￦	56,247
Land and Buildings	￦	2,861	￦	3,434	Borrowings	￦	2,928

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Intangible Assets

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Intangible Assets

13. Intangible Assets

Changes in intangible assets for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
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	)		(739,769	)		(4,657,146	)
Beginning, net	￦	236,058		￦	335,110		￦	65,944		￦	2,156,500		￦	513,512		￦	3,407,124
Changes in accounting policy 1		—			—			—			—			(26,207	)		(26,207	)
Acquisition and capital expenditure		—			47,903			30,965			—			99,826			178,694
Disposal and termination		—			(3,019	)		(1,267	)		(284	)		(11,109	)		(15,679	)
Amortization		—			(115,839	)		(68,222	)		(399,382	)		(77,262	)		(660,705	)
Impairment		(605	)		(1,333	)		(1,807	)		(3,035	)		(55,118	)		(61,898	)
Others		117			9,812			11,768			142			(9,131	)		12,708
Ending, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)

1 With the application of IFRS 16, intangible assets were reclassified to right-of-use assets.

	2020
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others1			Total
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)
Beginning, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition and capital expenditure		—			26,990			37,077			—			101,563			165,630
Disposal and termination		—			(1,849	)		(105	)		—			(11,866	)		(13,820	)
Amortization		—			(104,938	)		(54,191	)		(399,348	)		(69,677	)		(628,154	)
Impairment		—			—			(1,776	)		(193,194	)		(16,667	)		(211,637	)
Changes in scope of consolidation		—			575			77			—			3,690			4,342
Others		(5,485	)		87,587			27,537			(736	)		(98,043	)		10,860
Ending, net	￦	230,085		￦	280,999		￦	146,000		￦	1,160,663		￦	343,511		￦	2,161,258
Acquisition cost		536,093			1,767,422			1,053,980			3,373,095			1,167,735			7,898,325
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,008	)		(1,486,423	)		(907,980	)		(2,212,432	)		(824,224	)		(5,737,067	)

1 The carrying amount of membership rights and others, excluding goodwill, with indefinite useful life not subject to amortization is ￦ 221,099 million (2019: ￦ 203,240 million) as at December 31, 2020.

Due to the change in its business environment, the Group expects that it is no longer probable that its 28GHz frequency usage rights will be in the condition necessary for it to be capable of operating in the manner intended by management. As a result, the Group recognized an impairment loss of ￦ 190,929 million as the carrying amount of the 28GHz frequency usage right for the Controlling Company’s wireless business (acquisition cost: ￦ 201,461 million) exceeded the recoverable amount during the current period, and was recognized as operating expenses in the consolidated statement of profit or loss. The recoverable amount was calculated based on the value of use. Value of use was calculated by discounting the future cashflow that considers the remaining useful life (3 years) of frequency usage rights.

In relation to KT Skylife TV Co., Ltd., the Group recognized impairment loss of ￦ 38,519 million in Others as at December 31, 2019 as the carrying amount of cash-generating units exceeded its recoverable amount, and recognized operating expenses in the consolidated statements of operations during the prior period. The recoverable amount is based on fair value less value in use or disposal costs, and the discount rate applied in computing the recoverable amount is 7.3%. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate (-)1.25% based on past performance and its expectation of future market changes. During the current year, KT Skylife Co., Ltd. did not recognize an impairment loss for indefinite useful life intangible assets.

Goodwill is allocated to the Group’s cash-generating unit which is identified by operating segments. As at December 31, 2020, goodwill allocated to each cash-generating unit is as follows:

(In millions of Korean won)
Operating Segment	Cash generating Unit	Amount
ICT6	Mobile services1	￦	65,057
Finance	BC Card Co., Ltd.2		41,234
Others	GENIE Music Corporation (KT Music Corporation) 3		50,214
	PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) 4		42,745
	KT Telecop Co., Ltd. 5		15,418
	KT MOS Bukbu Co., Ltd and others		15,417
	Total	￦	230,085

1 The recoverable amounts of mobile services business are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% 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 7.43% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2018, 2019 and 2020.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.92% 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 7.75% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on fair value less cost to sell.

4 The recoverable amount of PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) is calculated based on fair value less cost to sell.

5 The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.30% 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 9.78% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

6 The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% ~ 4.93% 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 rate 7.43%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2018, 2019 and 2020.

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Investments in Associates and Joint Ventures

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Investments in Associates and Joint Ventures

14. Investments in Associates and Joint Ventures

Details of associates as at December 31, 2019 and 2020, are as follows:

	Percentage of ownership (%)						Location		Closing month
	2019			2020
Korea Information & Technology Fund		33.3	%		33.3	%		Korea		December 31, 2019, December 31, 2020
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%		Korea		December 31, 2019, December 31, 2020
KT-CKP New Media Investment Fund		49.7	%		—			Korea		December 31, 2019, December 31, 2020
K Bank Inc.		10.0	%		34.0	%		Korea		December 31, 2019, December 31, 2020
Hyundai Robotics Co., Ltd.2		—			10.0	%		Korea		December 31, 2019, December 31, 2020

1 At the end of the reporting period, although the Group owns 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, because the Group cannot participate in determining the operating and financial policies.

2 At the end of the reporting period, although the Group has less than 20% ownership in ordinary share, this entity is included in investments in associates as the Group has a significant influence in determining the operating and financial policies.

Changes in investments in associates and joint ventures for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	148,255	￦	—		￦	17,956		￦	(2,236	)	￦	163,975
KT-SB Venture Investment Fund		4,470		(4,470	)		—			—			—
KT-IBKC Future Investment Fund 1		9,961		3,750			389			—			14,100
KT-CKP New Media Investment Fund		281		(174	)		27			—			134
K Bank Inc.		52,655		21,782			(28,865	)		(414	)		45,158
Others1		56,785		(7,867	)		7,241			(11,866	)		44,293
	￦	272,407	￦	13,021		￦	(3,252	)	￦	(14,516	)	￦	267,660

	2020
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	163,975	￦	—		￦	12,205		￦	(6,025	)	￦	170,155
KT-IBKC Future Investment Fund 1		14,100		—			2,090			—			16,190
KT-CKP New Media Investment Fund		134		(134	)		—			—			—
K Bank Inc.		45,158		195,011			(30,209	)		(1,688	)		208,272
Hyundai Robotics Co., Ltd.		—		50,000			(64	)		1,000			50,936
Others1		44,293		28,400			34,298			5,337			112,328
	￦	267,660	￦	273,277		￦	18,320		￦	(1,376	)	￦	557,881

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 gain from associates and joint ventures of ￦ 279 million (2018: net loss of ￦ 445 million, 2019: net gain of ￦ 52 million) recognized as operating revenue during the period.

Summarized financial information of associates and joint ventures as at and for the years ended December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	113,233	￦	378,691	￦	—	￦	—
KT-IBKC Future Investment Fund 1		28,200		—		—		—
KT-CKP New Media Investment Fund		3		267		—		—
K Bank Inc.		2,480,065		78,566		2,350,375		3,784

(In millions of Korean won)	December 31, 2020
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	107,652	￦	402,812	￦	—	￦	—
KT-IBKC Future Investment Fund 1		32,379		—		—		—
K Bank Inc.		4,255,620		74,193		3,752,838		88,155
Hyundai Robotics Co., Ltd.		315,886		125,619		80,615		59,324

(In millions of Korean won)	2019
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	70,577	￦	53,867		￦	6,132		￦	59,999		￦	4,280
KT-IBKC Future Investment Fund 1		1,694		779			—			779			—
KT-CKP New Media Investment Fund		56		55			—			55			—
K Bank Inc.		92,720		(100,773	)		(23	)		(100,796	)		—

(In millions of Korean won)	2020
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	54,473	￦	36,615		￦	9,647		￦	46,262		￦	9,241
KT-IBKC Future Investment Fund 1		6,551		4,179			—			4,179			—
K Bank Inc.		80,301		(105,374	)		(1,126	)		(106,500	)		—
Hyundai Robotics Co., Ltd.		195,311		(642	)		11,573			10,931			—

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	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	￦	491,924		33.30	%	￦	163,975	￦	—	￦	163,975
KT-IBKC Future Investment Fund 1		28,200		50.00	%		14,100		—		14,100
KT-CKP New Media Investment Fund		270		49.70	%		134		—		134
K Bank Inc.1		204,472		10.00	%		45,158		—		45,158

1 12.1% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

(In millions of Korean won)	December 31, 2020
	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	￦	510,464		33.30	%	￦	170,155	￦	—	￦	170,155
KT-IBKC Future Investment Fund 1		32,379		50.00	%		16,190		—		16,190
K Bank Inc.1		488,819		34.00	%		166,198		42,074		208,272
Hyundai Robotics Co., Ltd.		301,566		10.00	%		30,157		20,779		50,936

1 12.1% 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 ￦ 992 million for the year ended December 31, 2020 (for the year ended December 31, 2019: ￦ 6,124 million). The accumulated comprehensive loss of associates and joint ventures as at December 31, 2020, which was not recognized by the Group is ￦ 8,228 million (as at December 31, 2019: ￦ 12,599 million).

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Trade and Other Payables

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Trade and Other Payables

15. Trade and Other Payables

Details of trade and other payables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Current liabilities
Trade payables	￦	1,304,795	￦	1,239,717
Other payables		6,292,683		4,970,382
Total	￦	7,597,478	￦	6,210,099
Non-current liabilities
Trade payables	￦	1,733	￦	1,528
Other payables		1,080,487		806,012
Total	￦	1,082,220	￦	807,540

Details of other payables as at December 31, 2019 and 2020 are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Non-trade payables1	￦	5,275,224		￦	3,841,227
Accrued expenses		987,624			933,978
Operating deposits		910,045			803,904
Others		200,277			197,285
Less: non-current		(1,080,487	)		(806,012	)
Current	￦	6,292,683		￦	4,970,382

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 1,007,171 million related to credit card transactions are included as at December 31, 2020 (2019: ￦ 1,824,068 million).

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Borrowings

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Borrowings

16. Borrowings

Details of borrowings as at December 31, 2019 and 2020, are as follows:

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019					December 31, 2020
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 7, 2034	6.50%		USD 100,000	￦	115,780			USD 100,000	￦	108,800
MTNP notes		July 18, 2026	2.50%		USD 400,000		463,120			USD 400,000		435,200
MTNP notes		Aug. 7, 2022	2.63%		USD 400,000		463,120			USD 400,000		435,200
FR notes		Aug. 20, 2020	—		USD 200,000		231,560			—		—
FR notes2		Aug. 20, 2023	LIBOR(3M)+0.900%		USD 100,000		115,780			USD 100,000		108,800
MTNP notes		July 6, 2020	—		JPY 4,000,000		42,539			—		—
MTNP notes		July 6, 2021	0.38%		JPY 16,000,000		170,155			JPY 16,000,000		168,682
MTNP notes		Nov. 13, 2020	—		JPY 30,000,000		319,041			—		—
MTNP notes		July 19, 2022	0.22%		JPY 29,600,000		314,787			JPY 29,600,000		312,061
MTNP notes		July 19, 2024	0.33%		JPY 400,000		4,254			JPY 400,000		4,217
FR notes2		Nov. 1, 2024	LIBOR(3M)+0.980%		USD 350,000		405,230			USD 350,000		380,800
FR notes2		June 19, 2023	SOR(6M)+0.500%		—		—			SGD 284,000		233,510
MTNP notes		Sept. 1, 2025	1.00%		—		—			USD 400,000		435,200
The 180-2rd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
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 184-2nd 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 185-2nd Public bond		Sept. 16, 2020	—		—		300,000			—		—
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2024	3.70%		—		100,000			—		100,000
The 187-3rd Public bond		Sept. 2, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 2, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	—		—		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 189-2nd 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			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		150,000			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		170,000			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		70,000			—		70,000
The 191-1st Public bond		Jan. 14, 2022	2.05%		—		220,000			—		220,000
The 191-2nd Public bond		Jan. 15, 2024	2.09%		—		80,000			—		80,000
The 191-3rd Public bond		Jan. 15, 2029	2.16%		—		110,000			—		110,000
The 191-4th Public bond		Jan. 14, 2039	2.21%		—		90,000			—		90,000
The 192-1st Public bond		Oct. 11, 2022	1.55%		—		340,000			—		340,000
The 192-2nd Public bond		Oct. 11, 2024	1.58%		—		100,000			—		100,000
The 192-3rd Public bond		Oct. 11, 2029	1.62%		—		50,000			—		50,000
The 192-4th Public bond		Oct. 11, 2039	1.67%		—		110,000			—		110,000
The 193-1st Public bond		June 16, 2023	1.17%		—		—			—		150,000
The 193-2nd Public bond		June 17, 2025	1.43%		—		—			—		70,000
The 193-3rd Public bond		June 17, 2030	1.61%		—		—			—		20,000
The 193-4th Public bond		June 15, 2040	1.71%		—		—			—		60,000
The 148th Won-denominated unsecured bond		June 23, 2023	1.51%		—		—			—		100,000
Subtotal							7,045,366					6,962,470
Less: Current portion							(1,052,032	)				(1,228,283	)
Discount on bonds							(20,780	)				(19,847	)
Total						￦	5,972,554				￦	5,714,340

1 As at December 31, 2020, 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) and SOR (6M) are approximately 0.238% and 0.185%, respectively as at December 31, 2020.

Convertible bonds

(In millions of Korean won and thousands of foreign currencies)

December 31, 2019

Type

Issuance date

Maturity

Annual interest rate

December 31, 2019

December 31, 2020

The 1st CB(Private)1,2

Jun. 5, 2020

Jun. 5, 2025

0.00

%

￦

—

￦

8,000

Redemption premium

—

2,267

Bond discount issuance

—

(4,644

)

Subtotal

￦

—

￦

5,623

Current portion

￦

—

￦

—

Total

￦

—

￦

5,623

1 Common shares of Storywiz are subject to conversion (appraisal period: June 5, 2021~ May 4, 2025).

2 Nominal interest rate and maturity yield is approximately 0% and 5% and will be settled on maturity

Short-term borrowings

(In millions of Korean won)			December 31, 2019		December 31, 2020
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	1.740% ~ 2.360%	￦	15,000	￦	40,189
	Shinhan Bank	2.460% ~ 2.960%		57,500		22,500
	Shinhan Bank	CD91+1.431%		—		10,000
	Woori Bank	3.57%		—		1,900
	Korea Development Bank	3.34%		10,000		10,000
	SooHyup Bank	—		1,000		—
	Industrial Bank of Korea	1.74%		—		200
	Hana Bank	4.20%		—		11,000
	Total		￦	83,500	￦	95,789

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019				December 31, 2020
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%		—	￦	3,454		—	￦	2,961
Industrial Bank of Korea	General loans		2.98%		—		6,000		—		6,000
Shinhan Bank	General loans		1.94%		—		5,000		—		5,000
	Facility loans2		LIBOR(3M)+1.340%		USD 25,918		30,008		USD 25,918		28,199
	General loans2		LIBOR(3M)+1.650%		USD 3,000		3,473		USD 8,910		9,694
	General loans2		LIBOR(3M)+2.130%		—		—		USD 25,000		27,200
CA-CIB	Long-term CP		1.26%		—		—		—		100,000
NongHyup Bank	Facility loans		2.00%		—		79		—		54
Korea Development Bank	General loans		3.02%		—		10,000		—		10,000
	General loans		3.31%		—		30,000		—		30,000
Others	Kookmin Bank and other2		LIBOR(3M)+1.850%		USD 87,940		101,816		USD 48,855		53,155
			—		—		950		—		—
Subtotal						￦	190,780			￦	272,263
Less: Current portion						￦	(50,192)			￦	(94,042)
Total						￦	140,588			￦	178,221

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 0.238% as at December 31, 2020.

Repayment schedule of the Group’s borrowings including the portion of current liabilities as at December 31, 2020 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, 2021 ~ Dec 31, 2021	￦	1,060,000	￦	168,682	￦	1,228,682	￦	147,307	￦	42,524	￦	189,831	￦	1,418,513
Jan 1, 2022 ~ Dec 31, 2022		560,000		747,261		1,307,261		518		38,830		39,348		1,346,609
Jan 1, 2023 ~ Dec 31, 2023		590,000		342,310		932,310		100,500		36,894		137,394		1,069,704
Jan 1, 2024 ~ Dec 31, 2024		460,000		385,017		845,017		493		—		493		845,510
After Jan. 1, 2025		1,678,000		979,200		2,657,200		986		—		986		2,658,186
	￦	4,348,000	￦	2,622,470	￦	6,970,470	￦	249,804	￦	118,248	￦	368,052	￦	7,338,522

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Provisions

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Provisions

17. Provisions

Changes in provisions for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Increase (Transfer)		42,684			6,591			17,328			66,603
Usage		(35,640	)		(5,394	)		(15,851	)		(56,885	)
Reversal		(1,563	)		(6,736	)		(29,133	)		(37,432	)
Ending balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Current	￦	64,241		￦	37,906		￦	73,465		￦	175,612
Non-current		—			75,383			3,167			78,550
	2020
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Increase (Transfer)		17,064			(1,933	)		17,873			33,004
Usage		(3,948	)		(2,990	)		(2,266	)		(9,204	)
Reversal		(857	)		(3,023	)		(23,212	)		(27,092	)
Changes in scope of consolidation		—			424			898			1,322
Ending balance	￦	76,500		￦	105,767		￦	69,925		￦	252,192
Current	￦	76,500		￦	22,343		￦	67,147		￦	165,990
Non-current		—			83,424			2,778			86,202

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Net Defined Benefit Liabilities

12 Months Ended

Dec. 31, 2020

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, 2019			December 31, 2020
Present value of defined benefit obligations	￦	2,427,351		￦	2,556,712
Fair value of plan assets		(2,069,710	)		(2,189,375	)
Liabilities	￦	365,663		￦	378,087
Assets in the statement of financial position	￦	8,022		￦	10,750

Changes in the defined benefit obligations for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	2,201,876		￦	2,427,351
Current service cost		243,598			248,047
Interest expense		47,403			45,083
Benefit paid		(100,663	)		(258,866	)
Changes due to settlements of plan		910			1,075
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		39			5,191
Actuarial gains and losses arising from changes in financial assumptions		11,773			17,077
Actuarial gains and losses arising from experience adjustments		19,465			57,703
Changes in scope of consolidation		2,950			14,051
Ending	￦	2,427,351		￦	2,556,712

Changes in the fair value of plan assets for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	1,643,046		￦	2,069,710
Interest income		35,386			38,590
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(2,537	)		2,589
Benefits paid		(87,119	)		(213,953	)
Employer contributions		476,916			284,243
Changes in scope of consolidation		4,018			8,196
Ending	￦	2,069,710		￦	2,189,375

Amounts recognized in the ‘Operating expenses’ of the consolidated statements of operations for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Current service cost	￦	225,667		￦	243,598		￦	248,047
Net Interest cost		10,458			12,017			6,494
Past service cost		9,801			910			1,075
Transfer out		(13,881	)		(16,215	)		(16,514	)
Total expenses	￦	232,045		￦	240,310		￦	239,102

Principal actuarial assumptions used are as follows:

	December 31, 2018			December 31, 2019			December 31, 2020
Discount rate		2.32	%		1.97	%		1.93	%
Future salary increase		5.08	%		4.92	%		4.88	%

The sensitivity of the defined benefit obligations as at December 31, 2020, 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		￦ (86,288)	￦	93,254
Salary growth rate	0.5% point		85,344		(79,970	)

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, 2021, are ￦ 355,481 million.

The expected maturity analysis of undiscounted pension benefits as at December 31, 2020, 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	￦	232,550	￦	271,366	￦	794,840	￦	2,284,517	￦	3,583,273

The weighted average duration of the defined benefit obligations is 6.7 years.

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Defined Contribution Plan

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Defined Contribution Plan

19. Defined Contribution Plan

Recognized expense related to the defined contribution plan for the year ended December 31, 2020, is ￦ 61,912 million (2018: ￦ 48,210 million, 2019: ￦ 57,170 million).

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Commitments and Contingencies

20. Commitments and Contingencies

As at December 31, 2020, 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		1,502,000		—
Inter-Korean Cooperation Fund	Export-Import Bank of Korea	KRW		37,700		2,714
Insurance for Economic Cooperation project	Export-Import Bank of Korea	KRW		3,240		1,732
Collateralized loan on electronic accounts receivable-trade	Kookmin Bank and others	KRW		522,849		23,475
Plus electronic notes payable	Industrial Bank of Korea	KRW		50,000		331
Loans for working capital	Korea Development Bank and others	KRW		243,593		152,243
Facility loans	Shinhan Bank and others	KRW		100,123		55
	Kookmin Bank and others	USD		212,000		48,855
Derivatives transaction limit	Korea Development Bank	KRW		100,000		22,027
	Woori Bank and others	USD		69,054		44,616
Total		KRW		2,559,505		202,577
		USD		281,054		93,471

As at December 31, 2020, 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		208,386
Performance guarantee	Korea Development Bank and others		USD		8,569
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD		5,000
Guarantee for payment in won currency	Shinhan Bank and others		KRW		70,962
Refund guarantee for advances received	Korea Development Bank		USD		8,536
Guarantee for payment in foreign currency	KEB Hana Bank and others		USD		40,840
Comprehensive credit line	KEB Hana Bank and others		KRW		41,100
Comprehensive credit line	KEB Hana Bank and others		USD		8,700
Bid guarantee	KEB Hana Bank		USD		400
Bid guarantee	Korea Software Financial Cooperative and others		KRW		80,246
Performance guarantee /warranty guarantee			KRW		393,019
Guarantee for advance payments/others			KRW		388,656
Warranty guarantee	Seoul Guarantee Insurance		KRW		1,305
Performance guarantee			KRW		9,690
Guarantees for licensing			KRW		7,748
Guarantees for depositions			KRW		3,792
Merchant business guarantee insurance			KRW		237
Total			KRW		1,205,141
			USD		72,045

As at December 31, 2020, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won)	Subject to payment guarantees	Creditor	Limit		Used amount		Period
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Gasan Solar Power Plant Inc.	Shinhan Bank		4,700		1,371		Jan. 08, 2025
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	SPP Inc.	Suhyup Bank		3,250		932		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Korea Cell Inc.	Suhyup Bank		3,250		880		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	San-Ya Agricultural Association Corporation	Suhyup Bank		3,250		888		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Ciocanesti Korea Co., Ltd.	NH Investment & Securities Co.,Ltd.		7,600		7,600		Jun. 8, 2017
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		700		—		Apr. 17, 2020 ~ Apr. 16, 2021
Nasmedia Co., Ltd.	Stockholders Association Members	Korea Securities Finance Corp		5,654		2,735		—

1 According to the above payment guarantee, KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.), a subsidiary of the Group, will have an obligation of repayment if the principal borrower does not repay the borrowing.

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, 2020, the Controlling Company and KT Sat Co., Ltd. are jointly and severally liable for reimbursement of ￦ 1,618 million.

For the years ended December 31, 2019 and 2020, the Group made agreements with the Securitization Specialty Companies (2020: First 5G 49th to 54th Securitization Specialty Co., Ltd., 2019: First 5G 43rd to 48th Securitization Specialty Co., Ltd., 2018: Giga LTE Thirty seventh to Forty second 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, 2020, the Group is a defendant in 195 lawsuits with the total claimed amount of ￦ 110,409 million (2019: ￦ 214,877 million). As at December 31, 2020, litigation provisions of ￦ 76,500 million (2019: ￦ 62,241 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 as at December 31, 2020.

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.

As at December 31, 2020, the Group participates in Algerie Sidi Abdela new town development consortium (percentage of ownership: 2.5%) and has joint liability with other consortium participants.

As at December 31, 2020, contract amount of property and equipment acquisition agreement made but not yet recognized amounts to ￦ 596,983 million (2019: ￦ 851,798 million).

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Leases

12 Months Ended

Dec. 31, 2020

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Leases

21. Leases

Information on leases when the Group is a lessee is as follows: Information on leases when the Group is a lessor is provided in Note 12.

(i) Amounts recognized in the consolidated statement of financial position

The consolidated statement of financial position shows the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Right-of-use assets
Property and building	￦	1,020,619	￦	1,073,207
Machinery and track facilities		140,296		42,127
Others		107,414		101,845
Total	￦	1,268,329	￦	1,217,179
Investment property (buildings)		50,010		19,456
(In millions of Korean won)	December 31, 2019		December 31, 2020
Lease liabilities1
Current	￦	392,433	￦	345,224
Non-Current		818,919		798,416
Total	￦	1,211,352	￦	1,143,640

1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statement of financial position (Notes 9 and 41).

For the year ended December 31, 2020, right-of-use assets has increased for ￦ 404,293 million for lease contracts.

(ii) Amounts recognized in the consolidated statements of profit or loss

The consolidated statements of profit or loss show the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Depreciation of Right-of-use assets
Property and building	￦	300,773	￦	290,168
Machinery and track facilities		89,452		58,419
Others		52,402		55,588
Total	￦	442,627	￦	404,175
Depreciation of Investment Properties	￦	21,809	￦	19,113
Interest expense relating to lease liabilities		55,001		44,091
Expense relating to short-term leases		14,718		10,998
Expense relating to leases of low-value assets that are not short-term leases		26,575		25,894
Expense relating to variable lease payments not included in lease liabilities		5,993		8,096

The total cash outflow for leases for December 31, 2020, was ￦ 492,772 million (2019: ￦ 532,730 million).

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Share Capital

12 Months Ended

Dec. 31, 2020

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Share Capital

22. Share Capital

As at December 31, 2019 and 2020, the Group’s number of authorized shares is one billion.

December 31, 2019

December 31, 2020

Number of issued shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of issued 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, 2020

Text block [abstract]

Retained Earnings

23. Retained Earnings

Details of retained earnings as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		6,157,305		6,721,809
Total	￦	11,590,916	￦	12,155,420

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, 2020

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, 2019 and 2020, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Changes in investments in associates and joint ventures	￦	1,556		￦	16,257
Loss on derivatives valuation		(7,624	)		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			61,438
Exchange differences on translation for foreign operations		(10,571	)		(11,453	)
Total	￦	194,934		￦	86,051

Changes in accumulated other comprehensive income for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning			Increase/ decrease		Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(871	)	￦	2,427	￦	—		￦	1,556
Gain or loss on derivatives valuation		(30,474	)		67,534		(44,684	)		(7,624	)
Gain on valuation of financial assets at fair value through other comprehensive income		96,704			114,869		—			211,573
Exchange differences on translation for foreign operations		(15,201	)		4,630		—			(10,571	)
Total	￦	50,158		￦	189,460	￦	(44,684	)	￦	194,934

(In millions of Korean won)	2020
	Beginning			Increase/ decrease			Reclassification to gain or loss		Ending
Changes in investments in associates and joint ventures	￦	1,556		￦	14,701		￦	—	￦	16,257
Gain or loss on derivatives valuation		(7,624	)		(83,998	)		111,431		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			(150,135	)		—		61,438
Exchange differences on translation for foreign operations		(10,571	)		(882	)		—		(11,453	)
Total	￦	194,934			￦(220,314	)	￦	111,431	￦	86,051

The Group’s other components of equity as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Treasury stock1		￦(825,838)			￦(882,224)
Gain or loss on disposal of treasury stock2		1,229			(17,579	)
Share-based payments		7,769			5,901
Others3		(353,243	)		(340,882	)
Total		￦(1,170,083	)		￦(1,234,784	)

1 During the year ended December 31, 2020, the Group acquired 4,550,000 treasury shares and granted 1,150,580 treasury shares as share-based payment.

2 The amount directly reflected in equity is ￦7,288 million (2019: ￦603 million) for the year ended December 31, 2020. 

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, 2019 and 2020, the details of treasury stock are as follows:

	December 31, 2019		December 31, 2020
Number of shares (in shares)		15,870,258		19,269,678
Amounts (In millions of Korean won)	￦	825,838	￦	882,224

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, 2020

Text block [abstract]

Share-based Payments

25. Share-based Payments

Details of share-based payments as at December 31, 2020, are as follows:

(In share)	14th grant
Grant date	June 16, 2020
Grantee	CEOs, internal directors, external directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦22,700
Total compensation costs (in Korean won)	￦ 5,187 million
Estimated exercise date (exercise date)	During 2021
Valuation method	Fair value method

(In share)	Employee wage negotiation
Grant date	September 21, 2020
Grantee	All employees
Vesting conditions	Current employees as of September 21, 2020
Fair value per option (in Korean won)	￦22,950
Total compensation costs (in Korean won)	￦ 23,317 million
Estimated exercise date (exercise date)	December 22, 2020
Valuation method	Fair value method

Changes in the number of stock options and the weighted-average exercise price as at December 31, 2019 and 2020, are as follows:

	2019
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
12th grant		353,325		—		256,543		96,782		—		—
13th grant		—		372,023		—		—		372,023		—
Total		353,325		372,023		256,543		96,782		372,023		—

	2020
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
13th grant		372,023		—		241,548		130,475		—		—
14th grant		—		398,856		—		—		398,856		—
Employee wage negotiation		—		1,020,105		—		1,020,105		—		—
Total		372,023		1,418,961		241,548		1,150,580		398,856		—

1  The weighted average price of ordinary shares at the time of exercise in 2020 was ￦ 25,486 (2019: ￦ 27,482).

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities

12 Months Ended

Dec. 31, 2020

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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 Consolidated Statements of Operations:

(In millions of Korean won)	2018		2019		2020
Revenue from contracts with customers	￦	23,012,257	￦	24,441,122	￦	23,895,631
Revenue from other sources		423,793		458,067		545,016
Total revenue	￦	23,436,050	￦	24,899,189	￦	24,440,647

Operating revenues for the years ended December 31, 2018, 2019 and 2020 are as follows:

(In millions of Korean won)	2018		2019		2020
Mobile services	￦	6,827,685	￦	6,795,124	￦	6,805,218
Fixed-line services		4,869,253		4,866,698		4,827,015
Fixed-line and VoIP telephone services		1,708,319		1,578,546		1,463,553
Broadband Internet access services		2,112,763		2,177,447		2,256,188
Data communication services		1,048,171		1,110,705		1,107,274
Media and content		2,261,808		2,516,256		2,637,691
Financial services		3,444,917		3,641,655		3,493,920
Sale of goods		3,288,911		4,194,168		3,593,127
Others		2,743,476		2,885,288		3,083,676
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647

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 are considered a separate performance obligations. 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)	December 31, 2019		December 31, 2020
Contract assets1	￦	655,329	￦	672,672
Contract liabilities1		413,442		413,707
Deferred revenue2	￦	92,557	￦	89,694

1 The Group recognized contract assets of ￦ 86,234 million and contract liabilities of ￦29,574 million for long term construction contracts as at December 31, 2020 (2019: contract assets of ￦98,288 million and contract liabilities of ￦47,832 million). The Group recognizes contract assets as trade and other receivables, and contract liabilities as other current liabilities.

2 Deferred revenue recognized relating to government grant is excluded.

The contract costs recognized as assets are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Incremental cost of contract establishment	￦	1,764,009	￦	1,726,191
Cost of Contract performance		85,234		78,757

As at December 31, 2020, the Group recognized ￦ 1,831,638 million (2019: ￦ 1,681,039 million) of operating expenses related to contract cost assets.

The recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018		2019		2020
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905	￦	266,478	￦	251,975
Deferred revenue of joining/installment fee		39,975		44,032		42,685
Others		1,536		—		—
Total	￦	225,416	￦	310,510	￦	294,660

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Operating Expenses

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Operating Expenses

27. Operating Expenses

Operating expenses for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019		2020
Salaries and wages	￦	3,845,842		￦	3,974,233	￦	4,123,680
Depreciation		2,674,205			2,530,252		2,605,128
Depreciation of right-of-use assets		—			442,629		404,175
Amortization of intangible assets		607,527			656,611		624,982
Commissions		1,080,168			1,115,477		965,461
Interconnection charges		579,613			534,025		500,081
International interconnection fee		226,627			240,254		172,529
Purchase of inventories		4,414,094			4,453,820		3,681,801
Changes of inventories		(432,607	)		282,957		257,041
Sales commission		1,942,841			2,315,731		2,337,127
Service cost		1,540,869			1,610,261		2,102,875
Utilities		323,411			332,816		360,797
Taxes and dues		285,131			277,742		283,197
Rent		460,377			193,357		136,355
Insurance premium		73,654			82,404		71,018
Installation fee		143,669			155,178		132,117
Advertising expenses		157,675			150,166		132,466
Research and development expenses		176,758			165,028		156,940
Card service cost		3,112,618			3,066,766		2,941,669
Others		1,122,718			1,292,512		1,428,875
Total	￦	22,335,190		￦	23,872,219	￦	23,418,314

Details of salaries and wages for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Short-term employee benefits	￦	3,505,214	￦	3,663,337	￦	3,770,786
Post-employment benefits(Defined benefit plan)		232,045		240,310		239,102
Post-employment benefits(Defined contribution plan)		48,210		57,170		61,912
Share-based payment		8,439		6,398		28,604
Others		51,934		7,018		23,276
Total	￦	3,845,842	￦	3,974,233	￦	4,123,680

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Financial Income and Costs

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Financial Income and Costs

28. Financial Income and Costs

Details of financial income for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest income	￦	244,796	￦	282,704	￦	270,571
Gain on foreign currency transactions		17,175		24,596		17,493
Gain on foreign currency translation		3,691		17,979		164,351
Gain on settlement of derivatives		27,950		9,016		9,397
Gain on valuation of derivatives		66,305		77,353		172
Others		14,326		12,747		36,630
Total	￦	374,243	￦	424,395	￦	498,614

Details of financial costs for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest expenses	￦	296,874	￦	278,427	￦	263,579
Loss on foreign currency transactions		49,156		30,267		27,805
Loss on foreign currency translation		72,642		93,977		26,340
Loss on settlement of derivatives		—		20		1,406
Loss on valuation of derivatives		2,045		15,867		163,763
Loss on disposal of trade receivables		13,818		11,298		8,152
Others		1,124		2,277		16,338
Total	￦	435,659	￦	432,133	￦	507,383

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Deferred Income Tax and income Tax Expense

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	419,889		￦	404,434
Deferred tax assets to be recovered after more than 12 months		1,613,836			1,631,759
Deferred tax assets before offsetting		2,033,725			2,036,193
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(538,578	)		(637,317	)
Deferred tax liability to be recovered after more than 12 months		(1,495,759	)		(1,394,509	)
Deferred tax liabilities before offsetting		(2,034,337	)		(2,031,826	)
Deferred tax assets after offsetting	￦	424,856		￦	433,698
Deferred tax liabilities after offsetting	￦	425,468		￦	429,331

The gross movements on the deferred income tax account for the years ended December 31, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	260,584		￦	(612	)
Changes to the statement of operations		(199,527	)		(72,124	)
Changes to other comprehensive loss (income)		(61,669	)		77,103
Ending	￦	(612	)	￦	4,367

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)	2019
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		—			(10,250	)		(648	)		(10,898	)
Investment in subsidiaries, associates, and joint ventures		(93,604	)		(14,622	)		35			(108,191	)
Depreciation		(424	)		(11,182	)		—			(11,606	)
Advanced depreciation provision		(313,184	)		63			—			(313,121	)
Deposits for severance benefits		(398,982	)		(99,126	)		1,255			(496,853	)
Accrued income		(1,558	)		17			—			(1,541	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(369,916	)		(40,947	)		—			(410,863	)
Contract assets		(11,505	)		(42,245	)		—			(53,750	)
Financial assets at fair value through profit or loss		(661	)		338			—			(323	)
Financial assets at fair value through other comprehensive income		(41,798	)		(3,556	)		(58,483	)		(103,837	)
Others		(284,255	)		(238,725	)		(170	)		(523,150	)
Total		(1,516,091	)		(460,235	)		(58,011	)		(2,034,337	)
Deferred tax assets
Derivative instruments		8,341			(850	)		(7,491	)		—
Provision for impairment or trade receivables		99,887			(15,816	)		—			84,071
Inventory valuation		121			(98	)		—			23
Contribution for construction		16,800			(646	)		—			16,154
Unsettled expenses		127,897			32,539			—			160,436
Provisions		36,178			(3,354	)		—			32,824
Property and equipment		230,278			(1,623	)		—			228,655
Defined benefit liabilities		513,842			48,847			6,782			569,471
Withholding of facilities expenses		6,609			(426	)		—			6,183
Deduction of installment receivables		42			6			—			48
Assets retirement obligation		24,532			4,484			—			29,016
Gain or loss foreign currency translation		10,672			10,005			—			20,677
Deferred revenue		39,641			(3,841	)		—			35,800
Real-estate sales		21,728			(8,043	)		—			13,685
Others		537,209			174,177			(2,949	)		708,437
Total		1,673,777			235,361			(3,658	)		1,905,480
Temporary difference, net		157,686			(224,874	)		(61,669	)		(128,857	)
Tax credit carryforwards		102,898			25,347			—			128,245
Total net balance		260,584			(199,527	)		(61,669	)		(612	)

(In millions of Korean won)	2020
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		(10,898	)		10,055			—			(843	)
Investment in subsidiaries, associates, and joint ventures		(108,191	)		(64,553	)		(8,820	)		(181,564	)
Depreciation		(11,606	)		7,431			—			(4,175	)
Advanced depreciation provision		(313,121	)		1,203			—			(311,918	)
Deposits for severance benefits		(496,853	)		(26,419	)		2,015			(521,257	)
Accrued income		(1,541	)		(212	)		—			(1,753	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(410,863	)		67,898			—			(342,965	)
Contract assets		(53,750	)		(112,794	)		—			(166,544	)
Financial assets at fair value through profit or loss		(323	)		(304	)		—			(627	)
Financial assets at fair value through other comprehensive income		(103,837	)		(4,420	)		77,634			(30,623	)
Others		(523,150	)		53,797			—			(469,353	)
Total		(2,034,337	)		(68,318	)		70,829			(2,031,826	)
Deferred tax assets
Derivative instruments		—			40,342			(9,860	)		30,482
Provision for impairment or trade receivables		84,071			4,994			—			89,065
Inventory valuation		23			(259	)		—			(236	)
Contribution for construction		16,154			246			—			16,400
Unsettled expenses		160,436			(24,358	)		—			136,078
Provisions		32,824			1,198			—			34,022
Property and equipment		228,655			(1,695	)		—			226,960
Defined benefit liabilities		569,471			13,707			15,186			598,364
Withholding of facilities expenses		6,183			(436	)		—			5,747
Deduction of installment receivables		48			(20	)		—			28
Assets retirement obligation		29,016			(883	)		—			28,133
Gain or loss foreign currency translation		20,677			(20,539	)		—			138
Deferred revenue		35,800			7,230			—			43,030
Contract assets		—			97,464			—			97,464
Real-estate sales		13,685			(13,685	)		—			—
Others		708,437			(123,798	)		948			585,587
Total		1,905,480			(20,492	)		6,274			1,891,262
Temporary difference, net		(128,857	)		(88,810	)		77,103			(140,564	)
Tax credit carryforwards		128,245			16,686			—			144,931
Total net balance		(612	)		(72,124	)		77,103			4,367

The tax impacts recognized directly to equity as at December 31, 2018, 2019, and 2020, are as follows:

	2018									2019									2020
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Gain on valuation of financial assets at fair value through other comprehensive income		59,384			(15,573	)		43,811			225,635			(58,483	)		167,152			54,969			(12,972	)		41,997
Gain (loss) on valuation of hedge instruments		(36,756	)		9,745			(27,011	)		31,003			(8,139	)		22,864			37,247			(9,860	)		27,387
Remeasurements of net defined benefit liabilities		(116,324	)		42,813			(73,511	)		(33,814	)		8,037			(25,777	)		(77,382	)		17,201			(60,181	)
Share of gain(loss) of associates and joint ventures, and others		(1,036	)		179			(857	)		4,493			(1,327	)		3,166			25,538			(8,820	)		16,718
Exchange differences on translation for foreign operations		3,989			(1,049	)		2,940			6,692			(1,759	)		4,933			(3,614	)		948			(2,666	)
Total	￦	(90,743	)	￦	36,115		￦	(54,628	)	￦	234,009		￦	(61,671	)	￦	172,338		￦	36,758		￦	(13,503	)	￦	23,255

Details of income tax expense for the years ended December 31, 2018, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2018			2019		2020
Current income tax expense	￦	329,581		￦	120,533	￦	213,225
Impact of change in deferred taxes		(15,016	)		199,527		72,124
Income tax expense	￦	314,565		￦	320,060	￦	285,349

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)	2018			2019			2020
Profit before income tax expense	￦	1,033,977		￦	1,015,928		￦	1,031,605
Statutory income tax expense	￦	273,982		￦	269,018		￦	273,329
Tax effect
Income not taxable for taxation purposes		(85,322	)		(1,265	)		(24,657	)
Non-deductible expenses		18,126			19,543			31,741
Tax credit		(20,319	)		(39,190	)		(47,056	)
Additional payment of income taxes		11,439			3,832			429
Tax effect and adjustment on consolidation
Goodwill impairment		137			159			—
Eliminated dividend income form subsidiaries		31,966			21,917			20,682
Changes of out-side tax effect		618			13,539			38,552
Investment in-kind		82,820			—			—
Intangible Asset impairment and amortization		—			14,052			3,790
Reversal expenses of contract cost assets		—			11,213			(6,643	)
Others		1,118			7,242			(4,818	)
Income tax expense	￦	314,565		￦	320,060		￦	285,349

Details of deferred tax assets and liabilities that are not recognized as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019		2020
Deductible temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	610,351	￦	583,890
Unused tax loss		31,257		28,115
Unused Tax credit		—		2,654
Others		32,494		64,760
Total	￦	674,102	￦	679,419
Taxable temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	141,664	￦	132,848
Others		10,372		9,568
Total	￦	152,036	￦	142,416

The expected period of expiry for unused tax losses not recognized in deferred tax assets as at December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	2019		2020
2021	￦	18,582	￦	2,140
2022		2,140		80,649
2023		80,649		5,848
2024		5,848		4,867
2025		4,867		2,847
2026		9,390		9,709
2027		7,888		8,389
2028		10,064		8,426
2029		2,030		2,579
2030		617		2,339
Total	￦	142,075	￦	127,793

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Earnings per Share

12 Months Ended

Dec. 31, 2020

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, 2018, 2019 and 2020, is calculated as follows:

	2018		2019		2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703	￦	700,889
Weighted average number of ordinary shares outstanding (In number of shares)		245,049,466		245,171,283		245,207,307
Basic earnings per share (In Korean won)		2,634		2,634		2,858

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, 2018, 2019 and 2020 is calculated as follows:

	2018		2019			2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703		￦	700,889
Adjustment to net income attributable to ordinary shares (In millions of Korean won)		—		(157	)		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		645,571		645,546			700,889
Number of dilutive potential ordinary shares outstanding (In number of shares)		1,163		70,267			69,598
Weighted average number of ordinary shares outstanding (In number of shares)		245,050,629		245,241,550			245,276,905
Diluted earnings per share (In Korean won)		2,634		2,632			2,858

Diluted earnings per share is earnings per outstanding of ordinary shares and dilutive potential ordinary shares. Diluted earnings per share is calculated by dividing adjusted profit for the year by the sum of the number of ordinary shares and dilutive potential ordinary shares.

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Dividend

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Dividend

31. Dividend

The dividends paid by the Group in 2020, 2019 and 2018 were ￦269,766 million (￦ 1,100 per share), ￦269,659 million (￦ 1,100 per share), and ￦245,097 million (￦ 1,000 per share), respectively. A dividend in respect of the year ended December 31, 2020, of ￦1,350 per share, amounting to a total dividend of ￦326,487 million, was approved at the shareholders’ meeting on March 29, 2021.

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Cash Generated from Operations

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Cash Generated from Operations

32. Cash Generated from Operations

Cash flows from operating activities for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
1. Profit for the year	￦	719,412		￦	695,868		￦	746,256
2. Adjustments to reconcile net income
Income tax expense		314,565			320,060			285,349
Interest income		(265,817	)		(303,722	)		(291,425	)
Interest expense		296,894			278,975			265,035
Dividends income		(2,910	)		(3,408	)		(4,442	)
Depreciation		2,735,413			2,567,754			2,635,307
Amortization of intangible assets		629,526			660,705			628,154
Depreciation of right-of-use assets		—			433,199			404,174
Provision for severance benefits		245,926			256,525			255,615
Impairment losses on trade receivables		113,064			60,193			139,957
Share of net profit or loss of associates and joint ventures		5,912			3,252			(18,041	)
Loss(gain) on disposal of associates and joint ventures		(3,737	)		30			111
Loss(gain) on disposal of right-of-use assets		—			1,556			2,047
Impairment losses on assets held for sale		—			7,586			—
Loss on disposal of property and equipment and investment in properties		68,688			49,284			55,590
Loss(gain) on disposal of intangible assets		(4,256	)		(1,248	)		246
Loss on impairment of intangible assets		12,997			61,899			211,636
Loss(gain) on foreign currency translation		68,952			75,998			(138,011	)
Loss(gain) on valuation and settlement of derivatives, net		(92,210	)		(70,482	)		155,600
Loss(gain) on disposal of financial assets at fair value through profit or loss		(1,712	)		(5,115	)		329
Gain on valuation of financial assets at fair value through profit or loss		(10,768	)		(4,335	)		(59,044	)
Loss(gain) on disposal of financial assets at amortized cost		(44	)		43			(138	)
Others		(55,969	)		143,500			127,949
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		(81,217	)		(433,292	)		66,462
Decrease(Increase) in other receivables		356,643			(79,130	)		685,209
Decrease(increase) in other current assets		(123,258	)		984			9,089
Decrease(increase) in other non-current assets		19,556			(178,180	)		(86,039	)
Decrease(increase) in inventories		(480,543	)		240,488			288,507
Increase(decrease) in trade payables		(167,841	)		44,354			(135,760	)
Decrease in other payables		(448,301	)		(102,375	)		(1,232,646	)
Increase in other current liabilities		291,548			43,384			127,076
Increase(decrease) in other non-current liabilities		144,072			(199,547	)		(56,319	)
Decrease(Increase) in provisions		85,946			(12,164	)		2,264
Decrease(Increase) in deferred revenue		48,201			641			(1,948	)
Increase in plan assets		(53,301	)		(375,499	)		(136,336	)
Payment of severance benefits		(153,209	)		(119,716	)		(186,520	)
4. Cash generated from operations (1+2+3)	￦	4,212,222		￦	4,058,065		￦	4,745,293

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, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Reclassification of the current portion of borrowings	￦	1,149,599		￦	1,030,056		￦	1,229,359
Reclassification of construction-in-progress to property and equipment		1,988,014			2,698,146			3,011,519
Reclassification of accounts payable from property and equipment		122,185			685,859			22,052
Reclassification of accounts payable from intangible assets		584,595			(356,911	)		(345,675	)
Reclassification of payable from defined benefit liability		(31,838	)		(19,053	)		72,346
Reclassification of payable from plan assets		(9,497	)		(14,298	)		66,046

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Changes in Liabilities Arising from Financing Activities

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Changes in Liabilities Arising from Financing Activities

33. Changes in Liabilities Arising from Financing Activities

Changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Beginning			Cash flows			Non-cash													Ending
							Changes in Accounting Policy1		Newly acquired		Exchange difference			Fair Value changes			Others
Borrowing	￦	6,648,294		￦	574,175		￦	—	￦	—	￦	64,398		￦	—		￦	12,000		￦	7,298,867
Lease liabilities		163,858			(485,444	)		771,410		774,906		—			—			(13,379	)		1,211,351
Derivative liabilities		65,067			(9,734	)		—		—		(4,234	)		(20,058	)		(10,945	)		20,096
Derivative assets		(29,843	)		33,635			—		—		(53,729	)		(11,398	)		2,759			(58,576	)
Total	￦	6,847,376		￦	112,632		￦	771,410	￦	774,906	￦	6,435		￦	(31,456	)	￦	(9,565	)	￦	8,471,738

1 For information on the financial impacts due to change in accounting policy, see Note 41.

(In millions of Korean won)	2020
	Beginning			Cash flows			Non-cash													Ending
							Newly acquired		Exchange difference			Fair Value changes			Change in Consolidati- on Scope		Others
Borrowing	￦	7,298,867		￦	167,867		￦	17,523	￦	(157,985	)	￦	—		￦	—	￦	(9,974	)	￦	7,316,298
Lease liabilities		1,211,351			(447,784	)		473,477		(3	)		40			3,564		(97,005	)		1,143,640
		—			(13,674	)		13,674		—			—			—		—			—
Derivative liabilities		20,096			(943	)		2,798		142,511			(23,669	)		—		(10,220	)		130,573
Derivative assets		(58,576	)		34,933			—		2,870			(3,456	)		—		16,623			(7,606	)
Total	￦	8,471,738		￦	(259,601	)	￦	507,472	￦	(12,607	)	￦	(27,085	)	￦	3,564	￦	(100,576	)	￦	8,582,905

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Segment Information

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Segment Information

34. Segment Information

The Group’s operating segments are as follows:

Details	Business service
ICT	Mobile/fixed line telecommunication service and convergence 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, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	17,724,320		￦	933,191		￦	2,917,163
Finance		3,771,681			148,440			22,580
Satellite TV		690,821			66,735			98,310
Others		5,159,459			53,316			236,715
		27,346,281			1,201,682			3,274,768
Elimination		(3,910,231	)		(100,822	)		6,964
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2019
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	18,527,631		￦	634,046		￦	3,229,159
Finance		3,795,185			158,235			27,852
Satellite TV		694,637			69,357			94,992
Others		5,845,973			218,402			357,294
		28,863,426			1,080,040			3,709,297
Elimination		(3,964,237	)		(53,070	)		(79,805	)
Consolidated amount	￦	24,899,189		￦	1,026,970		￦	3,629,492

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2020
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1,2
ICT	￦	18,275,765		￦	809,741		￦	3,233,878
Finance		3,686,430			85,008			53,098
Satellite TV		706,631			71,345			84,931
Others		5,944,093			209,078			346,215
		28,612,919			1,175,172			3,718,122
Elimination		(4,172,272	)		(152,839	)		(83,838	)
Consolidated amount	￦	24,440,647		￦	1,022,333		￦	3,634,284

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

2 Property and equipment and intangible assets associated with ICT reporting segment are ￦ 13,583,173 million.

Operating revenues for the years ended December 31, 2018, 2019 and 2020 and non-current assets as at December 31, 2019 and 2020 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues						Non-current assets1
Location	2018		2019		2020		2019.12.31		2020.12.31
Domestic	￦	23,376,218	￦	24,832,068	￦	24,368,729	￦	19,198,416	￦	18,934,766
Overseas		59,832		67,121		71,918		76,679		18,243
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647	￦	19,275,095	￦	18,953,009

1 Non-current assets include property and equipment, intangible assets, investment properties and right-of-use assets.

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Related Party Transactions

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Related Party Transactions

35. Related Party Transactions

The list of related party of the Group as at December 31, 2020, is as follows:

Relationship

Name of Entry

Associates and joint ventures

Korea Information & Technology Investment Fund (KIF Investment Fund), K-Realty CR-REITs No.1, Boston Global Film & Contents Fund L.P., QTT Global (Group) Company Limited, CU Industrial Development Co., Ltd., KD Living, Inc., Oscar Ent. Co., Ltd., LoginD Co., Ltd., K-REALTY CR-REIT 6, K Bank, Inc., Daiwon Broadcasting Co., Ltd., KT-DSC creative economy youth start-up investment fund, Korea electronic Vehicle charging service, K-REALTY RENTAL HOUSING REIT 2, AI RESEARCH INSTITUTE, KT-IBKC Future Investment Fund 1, Gyeonggi-KT Yoojin Superman Fund, FUNDA Co., Ltd., CHAMP IT Co.,Ltd., Alliance Internet Corp., Little big pictures, Virtual Realm Sendirian Berhad, KT Philippines Co., Ltd., Studio Discovery Co., Ltd , KT Young Entrepreneurs DNA Investment Fund, Hyundai Robotics Co., Ltd., IGIS Professional investors Private Investment Real Estate Investment LLC No 395, KT-Smart Factory Investment Fund

Outstanding balances of receivables and payables in relations to transactions with related parties as at December 31, 2019 and 2020, are as follows:

		December 31, 2019
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	608	￦	23,100	￦	—	￦	57,907
	K Bank, Inc.		583		13,664		557		—
	Others		434		1,177		711		—
Total		￦	1,625	￦	37,941	￦	1,268	￦	57,907

		December 31, 2020
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	457	￦	16,200	￦	—	￦	20,857
	K Bank, Inc.		775		32,964		891		—
	Others		72		1,147		858		—
Total		￦	1,304	￦	50,311	￦	1,749	￦	20,857

Significant transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

		2018
(In millions of Korean won)		Sales	Purchases1	Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦2,088	￦31,984	￦8,932
	MOS GS Co., Ltd. 2	493	12,023	8
	MOS Daegu Co., Ltd. 2	229	8,775	8
	MOS Chungcheong Co., Ltd. 2	540	9,159	8
	MOS Gangnam Co., Ltd. 2	333	11,549	10
	MOS GB Co., Ltd. 2	1,378	16,519	12
	MOS BS Co., Ltd. 2	324	11,193	10
	MOS Honam Co., Ltd. 2	331	10,499	10
	K Bank, Inc.	15,705	7,004	—
	NgeneBio 3	3	—	—
	Others	2,888	9,547	2,148
Total		￦24,312	￦128,252	￦11,146

1 The 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

		2019
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	1,302	￦	—
	K Bank, Inc.		17,815		8,524
	Others		1,498		10,531
Others	K-REALTY CR-REIT 10 1		2,801		—
	Total	￦	23,416	￦	19,055

1 The amounts include acquisition of property and equipment and others.

		December 31, 2019
(In millions of Korean won)		Acquisition of lease receivables		Acquisition of right-of-use assets		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦	—	￦	776	￦	2,225	￦	10,928
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		—		4,280
	Others		—		—		—		146
	Total	￦	—	￦	776	￦	2,225	￦	15,354

		2020
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,298	￦	—
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—
	K Bank, Inc.		15,658		8,227
	Others		809		10,272
	Total	￦	18,765	￦	18,499

1 The amounts include acquisition of primarily property and equipment.

		December 31, 2020
(In millions of Korean won)		Interest income		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1		￦—		￦917		￦8,061
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		9,241
	K Bank, Inc.		14		—		—
	Others		—		—		43
	Total	￦	14	￦	917	￦	17,345

Key management compensation for the years ended December 31, 2018, 2019 and 2020, consists of:

(In millions of Korean won)	2018		2019		2020
Salaries and other short-term benefits	￦	2,762	￦	2,955	￦	2,086
Post-employment benefits		751		321		390
Stock-based compensation		878		891		5,613
Total	￦	4,391	￦	4,167	￦	8,089

Fund transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Equity contributions in cash and others
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000
KT-CKP New Media Investment Fund		(1,229	)
PT. Mitra Transaksi Indonesia 1		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
K-REALTY CR REIT 1		—
Korea Information & Technology Investment Fund		—
MOS GS Co., Ltd. 2		(147	)
MOS Daegu Co., Ltd. 2		(147	)
MOS Chungcheong Co., Ltd. 2		(153	)
MOS Gangnam Co., Ltd. 2		(180	)
MOS GB Co., Ltd. 2		(203	)
MOS BS Co., Ltd. 2		(183	)
MOS Honam Co., Ltd. 2		(206	)
Daiwon Broadcasting Co., Ltd.		—
Boston Global Film & Contents Fund L.P.		(986	)
Gyeonggi-KT Green Growth Fund		—
Total	￦	24,713

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

	December 31, 2019
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing 2		Repayment
KT-IBKC Future Investment Fund1	￦	—	￦	—	￦	3,750
KT Philippines co. Ltd.		—		—		99
Virtua Realm Sendirian Berhad		—		—		550
K-REALTY CR REIT 1		—		30,385		—
K Bank, Inc		—		—		21,782
KIF Investment Fund		—		—		—
Daiwon Broadcasting Co.,Ltd.		—		—		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		—		—		—
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
KT-CKP New Media Investment Fund		—		—		(174	)
KT-DSC creative economy youth start-up investment fund		—		—		(1,800	)
KT-Smart Factory Investment Fund		—		—		2,800
KT-SB Venture Investment Fund		—		—		(2,404	)
Total	￦	—	￦	30,385	￦	25,603

1 Borrowing transactions include lease transactions.

2 Conversion effect from the adoption of IFRS 16 Lease on January 1, 2019 has been excluded.

	December 31, 2020
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing		Repayment
K- Realty CR-REITs No.1	￦	—	￦	20,304	￦	—
Studio Discovery Co. Ltd.		—		—		3,000
KT Young Entrepreneurs DNA Investment Fund		—		—		3,600
KT-Smart Factory Investment Fund		—		—		2,800
KT-CKP New Media Investment Fund		—		—		(109	)
K Bank Inc.		—		—		195,011
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
Hyundai Robotics Co. Ltd.		—		—		50,000
Total	￦	—	￦	20,304	￦	255,302

1 Borrowing transactions include lease transactions.

As at December 31, 2020, there is no collateral or payment guarantee provided to or from related parties.

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Financial Risk Management

12 Months Ended

Dec. 31, 2020

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, 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, 2018, 2019 and 2020, 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
2018.12.31		10	%	￦	7,212		￦	10,196
		-10	%		(12,413	)		(9,625	)
2019.12.31		10	%	￦	45,149		￦	52,092
		-10	%		(45,149	)		(52,092	)
2020.12.31		10	%	￦	25,220		￦	36,961
		-10	%		(25,220	)		(36,961	)

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, 2018, 2019 and 2020, are as follows:

(In thousands of foreign currencies)	2018				2019				2020
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		528,539		1,893,849		645,941		1,830,764		400,046		1,937,935
SDR1		267		730		255		729		255		728
JPY		66,078		50,000,000		24,930		80,000,000		209,376		46,000,009
GBP		—		256		—		56		—		—
EUR		2		6		1		6		316		162
DZD2		618		—		—		—		—		—
CNY		1,954		171		457		161		458		491
UZS3		121,053		—		—		—		—		—
RWF4		857		—		706		—		646		—
THB5		—		—		—		—		535		—
MMK6		84		—		84		—		—		—
TZS7		—		2,876		6,919		—		1,019		—
BWP8		897		—		911		—		212		—
HKD		—		—		—		268		—		198
BDT9		39,494		—		18,897		—		—		—
PLN10		26		—		—		—		26		—
VND11		467,272		—		271,563		—		242,370		—
XAF12		666		—		97,411		—		16,229		—
SGD		—		—		—		—		6		284,000

1  Special Drawing Rights.

2  Algeria Dinar.

3  Uzbekistan Sum.

4  Rwanda Franc.

5  Thailand Bhat.

6  Myanmar Kyat.

7  Tanzanian Shilling.

8  Botswana Pula.

9  Bangladesh Taka.

10  Polish Zloty.

11  Vietnam Dong.

12  Central African Franc.

(iii) Price risk

As at December 31, 2018, 2019 and 2020, 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
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)
2019.12.31	10%	￦	24		￦	613
	-10%		(24	)		(613	)
2020.12.31	10%	￦	2,811		￦	3,472
	-10%		(2,811	)		(3,472	)

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, 2018, 2019 and 2020, 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
2018.12.31		+ 100 bp	￦	1,059		￦	9,689
		- 100 bp		(1,958	)		(10,237	)
2019.12.31		+ 100 bp	￦	425		￦	14,764
		- 100 bp		(482	)		(19,280	)
2020.12.31		+ 100 bp	￦	973		￦	18,584
		- 100 bp		(973	)		(19,377	)

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.

The maximum exposure to credit risk of the Group’s financial instruments without considering value of collaterals as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Cash and cash equivalents (except for cash on hand)	￦	2,226,608	￦	2,625,581
Trade and other receivables
Financial assets at amortized costs		5,784,228		5,034,621
Financial assets at fair value through other comprehensive income		1,256,266		1,118,619
Contract assets		557,041		586,438
Other financial assets
Derivatives financial assets for hedging		58,576		7,684
Financial assets at fair value through profit or loss		541,657		680,453
Financial assets at fair value through other comprehensive income		7,086		6,570
Financial assets at amortized costs		441,804		671,068
Total	￦	10,873,266	￦	10,731,034

(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.

The Group measures the expected credit loss by considering the future irrecoverability rate of the remaining balance of trade receivables and other receivables at the end of the reporting period. Each trade receivables and other receivables are classified considering the credit risk characteristics and overdue periods in order to measure expected credit loss. The expected credit loss rate calculation is based on historical payment and credit loss information in relation to revenue for 36 months period up to December 31, 2020. Expected credit loss of 12 months was applied as the credit sales and other credit-related assets of BC Card Co., Ltd., a subsidiary of the Group, has been determined to have low credit risk.

(ii) Cash equivalents (except for cash on hand)

The Group is also exposed to credit risk in relation cash equivalents. 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

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 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 consolidated financial statements.

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	8,149,445	￦	805,241	￦	370,044	￦	9,324,730
Borrowings(including debentures)		1,304,936		4,417,639		2,493,637		8,216,212
Lease liabilities		397,609		688,518		221,255		1,307,382
Other non-derivative financial liabilities		1,749		175,764		18,962		196,475
Financial guarantee contracts1		19,422		—		—		19,422
Total	￦	9,873,161	￦	6,087,162	￦	3,103,898	￦	19,064,221

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.

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	6,587,796	￦	730,758	￦	258,255	￦	7,576,809
Borrowings(including debentures)		1,573,944		4,373,534		2,258,360		8,205,838
Lease liabilities		336,024		658,501		190,907		1,185,432
Other non-derivative financial liabilities		574		131,242		—		131,816
Financial guarantee contracts1		22,422		—		—		22,422
Total	￦	8,520,760	￦	5,894,035	￦	2,707,522	￦	17,122,317

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 consolidated financial statements.

	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

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	650,497	￦	1,602,513	￦	507,947	￦	2,760,957
Inflow		684,720		1,648,746		524,483		2,857,949

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	248,300	￦	2,179,046	￦	498,619	￦	2,925,965
Inflow		249,301		2,074,747		480,570		2,804,618

(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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Total liabilities	￦	19,491,530		￦	18,111,112
Total equity		15,140,684			15,551,433
Debt-to-equity ratio		129	%		116	%

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, 2019 and 2020, are as follows:

(In millions of Korean won, %)	December 31, 2019			December 31, 2020
Total borrowings	￦	7,298,867		￦	7,316,298
Less: cash and cash equivalents		(2,305,894	)		(2,634,624	)
Net debt		4,992,973			4,681,674
Total equity		15,140,684			15,551,433
Total capital		20,133,657			20,233,107
Gearing ratio		25	%		23	%

(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, 2019
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables	￦	66,487	￦	(1	)	￦	66,486	￦	(63,604	)	￦	—	￦	2,882
Other financial assets		18,571		(13	)		18,558		(18,526	)		—		32
	￦	85,058	￦	(14	)	￦	85,044	￦	(82,130	)	￦	—	￦	2,914

(In millions of Korean won)

December 31, 2020

Gross assets

Gross liabilities offset

Net amounts presented in the statement of financial position

Amounts not offset

Net amount

Financial instruments

Cash collateral

Trade receivables

￦

71,497

￦

(1

)

￦

71,496

￦

(67,421

)

￦

—

￦

4,075

Netting arrangements with reference to the offers of telecommunication facility interconnection, sharing data, and others among telecommunication 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, 2019
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	65,669	￦	(13	)	￦	65,656	￦	(63,628	)	￦	—	￦	2,028
Other financial liabilities		18,509		(1	)		18,508		(18,502	)		—		6
	￦	84,178	￦	(14	)	￦	84,164	￦	(82,130	)	￦	—	￦	2,034

(In millions of Korean won)	December 31, 2020
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	69,361	￦	—		￦	69,361	￦	(67,421	)	￦	—	￦	1,940
Other financial liabilities		1		(1	)		—		—			—		—
	￦	69,362	￦	(1	)	￦	69,361	￦	(67,421	)	￦	—	￦	1,940

Netting arrangements with reference to the offers of telecommunication facility interconnection, sharing data, and others among telecommunication companies.

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Fair Value

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, are as follows:

	December 31, 2019				December 31, 2020
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	2,305,894		1	￦	2,634,624		1
Trade and other receivables
Financial assets measured at amortized cost 2		5,748,459		1		4,976,423		1
Financial assets at fair value through other comprehensive income		1,256,266		1,256,266		1,118,619		1,118,619
Other financial assets
Financial assets measured at amortized cost		441,804		1		671,068		1
Financial assets at fair value through profit or loss		632,324		632,324		809,919		809,919
Financial assets at fair value through other comprehensive income		557,342		557,342		258,516		258,516
Derivative financial assets for hedging		58,576		58,576		7,684		7,684
Total	￦	11,000,665			￦	10,476,853
Financial liabilities
Trade and other payables	￦	8,679,698		1	￦	7,017,639		1
Borrowings		7,298,867		1		7,316,298		1
Other financial liabilities
Financial liabilities at amortized cost		129,945		1		132,558		1
Financial liabilities at fair value through profit or loss		38		38		2,682		2,682
Derivative financial liabilities for hedging		20,096		20,096		127,929		127,929
Total	￦	16,128,644			￦	14,597,106

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value

2 With the application of IFRS 7, lease receivables are excluded from fair value disclosure.

37.2 Fair Value Hierarchy

To provide an indication about the reliability of the inputs used in determining fair value, the Group classifies its financial instruments into the three levels prescribed under the accounting standards. Financial instruments that are measured at fair value are categorized by the fair value hierarchy, and the defined levels are as follows:

• Level 1: The fair value of financial instruments traded in active markets is based on quoted market prices at the end of the reporting period. The quoted market price used for financial assets held by the Group is the current bid price. These instruments are included in level 1.

• Level 2: The fair value of financial instruments that are not traded in an active market is determined using valuation techniques which maximize the use of observable market data and rely as little as possible on entity-specific estimates. If all significant inputs required to fair value an instrument are observable, the instrument is included in level 2.

• Level 3: If one or more of the significant inputs is not based on observable market data, the instrument is included in 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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,256,266	￦	—	￦	1,256,266
Other financial assets
Financial assets at fair value through profit or loss		232		136,951		495,141		632,324
Financial assets at fair value through other comprehensive income		6,738		508,550		42,054		557,342
Derivative financial assets for hedging		—		40,788		17,788		58,576
Disclosed fair value
Investment properties		—		—		2,304,583		2,304,583
Total	￦	6,970	￦	1,942,555	￦	2,859,566	￦	4,809,091
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	38	￦	—	￦	38
Derivative financial liabilities for hedging		—		20,096		—		20,096
Total	￦	—	￦	20,134	￦	—	￦	20,134

(In millions of Korean won)	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,118,619	￦	—	￦	1,118,619
Other financial assets
Financial assets at fair value through profit or loss		46,449		330,961		432,509		809,919
Financial assets at fair value through other comprehensive income		5,606		202,121		50,789		258,516
Derivative financial assets for hedging		—		7,684		—		7,684
Disclosed fair value
Investment properties		—		—		2,645,482		2,645,482
Total	￦	52,055	￦	1,659,385	￦	3,128,780	￦	4,840,220
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	45	￦	2,637	￦	2,682
Derivative financial liabilities for hedging		—		123,735		4,194		127,929
Total	￦	—	￦	123,780	￦	6,831	￦	130,611

37.3 Transfers Between Fair Value Hierarchy Levels of Recurring Fair Value Measurements

There are no transfers between Level 1 and Level 2 of the fair value hierarchy for the recurring fair value measurements.

Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2019 and 2020, are as follows:

	2019
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Derivative financial assets (liabilities) for hedging			Financial liabilities at fair value through profit or loss
Beginning balance	￦	163,600		￦	311,536		￦	(10,183	)	￦	7,758
Purchases		584,671			6,081			—			—
Reclassification		225,873			(444,782	)		—			—
Disposal		(485,419	)		(941	)		—			(9,734	)
Amount recognized in profit or loss1,2		6,416			—			14,462			1,976
Amount recognized in other comprehensive income1		—			170,160			13,509			—
Ending balance	￦	495,141		￦	42,054		￦	17,788		￦	—

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

	2020
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Financial liabilities at fair value through profit or loss			Derivative financial assets (liabilities) for hedging
Beginning balance	￦	495,141		￦	42,054		￦	—		￦	(17,788	)
Purchases		374,259			13,142			2,798			—
Reclassification		208			—			—			—
Disposal		(451,663	)		(571	)		—			—
Amount recognized in profit or loss1,2		14,564			(428	)		(161	)		29,345
Amount recognized in other comprehensive income1		—			(3,408	)		—			(7,363	)
Ending balance	￦	432,509		￦	50,789		￦	2,637		￦	4,194

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

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, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,256,266		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		632,092		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		550,604		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		58,576		2,3	Hull-White model, DCF Model
Investment properties		2,304,583		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	38		2	DCF Model
Derivative financial liabilities for hedging		20,096		2	DCF Model

	December 31, 2020
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,118,619		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		763,470		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		252,910		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		7,684		2	DCF Model
Investment properties		2,645,482		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	2,682		2,3	DCF Model, Binomial Option Pricing
Derivative financial liabilities for hedging		127,929		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, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	5,107		￦	(2,824	)	￦	3,682		￦	—
II. New transactions		—			—			—			—
III. Recognized at fair value through profit or loss		(1,425	)		2,824			(1,425	)		—
IV. Ending balance (I+II+III)	￦	3,682		￦	—		￦	2,257		￦	—

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Interests in Unconsolidated Structured Entities

12 Months Ended

Dec. 31, 2020

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 Asset Backed Commercial Paper (“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, 2020, 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. 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 Private Equity Fund (“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, 2020, 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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,595,895	￦	4,060,992	￦	2,562,931	￦	8,219,818
Assets recognized in statement of financial position
Other financial assets	￦	15,816	￦	100,496	￦	—	￦	116,312
Joint ventures and associates		8,542		192,022		—		200,564
Total	￦	24,358	￦	292,518	￦	—	￦	316,876
Maximum loss exposure1
Investment assets	￦	24,358	￦	292,518	￦	—	￦	316,876
Total	￦	24,358	￦	292,518	￦	—	￦	316,876

1 It includes the investments recognized in the Group’s consolidated 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.

	December 31, 2020
(In millions of Korean won)	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	2,004,869	￦	4,380,534	￦	2,152,412	￦	8,537,815
Assets recognized in statement of financial position
Other financial assets	￦	29,874	￦	128,332	￦	—	￦	158,206
Joint ventures and associates		51,607		219,753		—		271,360
Total	￦	81,481	￦	348,085	￦	—	￦	429,566
Maximum loss exposure1
Investment assets	￦	81,481	￦	348,085	￦	—	￦	429,566
Cash deficiency support		—		29,130		—		29,130
Total	￦	81,481	￦	377,215	￦	—	￦	458,696

1 It includes the investments recognized in the Group’s consolidated 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, 2020

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, 2018, 2019 and 2020 are as follows:

(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.		49.7	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.5	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.2	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co.,Ltd.		32.9	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.2	%		103,468		59			—			(170	)		103,357

(In millions of Korean won)	December 31, 2019
	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.		49.7	%	￦	374,150	￦	10,029		￦	(8,279	)	￦	6		￦	375,906
BC Card Co., Ltd.		30.5	%		345,547		37,795			(18,900	)		53,033			417,475
KT Powertel Co., Ltd.		55.2	%		52,865		1,751			—			(340	)		54,276
KT Hitel Co., Ltd.		32.9	%		52,336		1,720			—			653			54,709
KT Telecop Co., Ltd.		13.2	%		103,357		(588	)		—			(99,119	)		3,650

(In millions of Korean won)	December 31, 2020
	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.		49.7	%	￦	375,906	￦	22,171		￦	(8,279	)	￦	(898	)	￦	388,900
BC Card Co., Ltd.		30.5	%		417,475		9,899			(22,787	)		7,239			411,826
KT Powertel Co., Ltd.		55.2	%		54,276		2,151			(478	)		(202	)		55,747
KT Hitel Co., Ltd.		32.9	%		54,709		(1,840	)		—			(2,563	)		50,306
KT Telecop Co., Ltd.		13.2	%		3,650		152			—			(208	)		3,594

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, 2018, 2019 and 2020, are as follows:

	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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
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

	December 31, 2019
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	459,077		￦	2,580,634		￦	86,465		￦	115,694		￦	55,908
Non-current assets		389,199			1,332,348			31,587			164,124			223,969
Current liabilities		123,506			2,452,219			17,757			62,378			64,218
Non-current liabilities		19,333			142,013			2,009			12,391			89,622
Equity		705,437			1,318,750			98,286			205,049			126,037
Operating revenue		704,996			3,553,008			62,846			323,065			332,063
Profit or loss for the year		56,008			115,885			3,085			1,426			(4,875	)
Total comprehensive income (loss)		55,936			289,122			2,469			(1,840	)		(6,558	)
Cash flows from operating activities		152,549			429,331			780			49,870			52,693
Cash flows from investing activities		(101,594	)		(419,894	)		(9,525	)		(50,138	)		(44,393	)
Cash flows from financing activities		(18,833	)		(5,744	)		(687	)		(1,860	)		(5,227	)
Net increase (decrease) in cash and cash equivalents		32,122			3,693			(9,432	)		(2,128	)		3,073
Cash and cash equivalents at beginning of year		31,728			275,089			15,649			39,186			5,708
Exchange differences		—			380			—			(15	)		—
Cash and cash equivalents at end of year		63,850			279,162			6,217			37,043			8,781

	December 31, 2020
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	480,450		￦	1,785,914		￦	90,056		￦	140,948		￦	79,076
Non-current assets		439,026			1,298,484			29,638			148,001			239,380
Current liabilities		153,236			1,602,667			17,045			74,045			136,565
Non-current liabilities		21,803			176,083			1,788			18,554			57,172
Equity		744,437			1,305,648			100,861			196,350			124,719
Operating revenue		706,631			3,387,641			65,898			350,231			392,489
Profit or loss for the year		58,190			39,455			3,809			2,080			212
Total comprehensive income (loss)		55,647			61,796			3,442			(8,700	)		(1,319	)
Cash flows from operating activities		160,934			(119,163	)		6,011			62,521			35,834
Cash flows from investing activities		(105,293	)		58,042			(3,353	)		(58,186	)		(57,976	)
Cash flows from financing activities		(19,650	)		22,790			(1,515	)		(1,856	)		14,652
Net increase (decrease) in cash and cash equivalents		35,991			(38,331	)		1,143			2,479			(7,490	)
Cash and cash equivalents at beginning of year		63,850			279,162			6,217			37,043			8,781
Exchange differences		(7	)		(247	)		—			(83	)		—
Cash and cash equivalents at end of year		99,834			240,584			7,360			39,439			1,291

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 2018, 2019 and 2020 is summarized as follows:

(In millions of Korean won)	2018			2019			2020
Carrying amount of non-controlling interests acquired	￦	(194	)	￦	(9,566	)	￦	1,750
Consideration paid to non-controlling interests		11,312			484			9,878
Excess of consideration paid recognized in parent’s equity	￦	11,118		￦	(9,082	)	￦	11,628

XML

Business Combination

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Business Combination

40. Business Combination

On April 30, 2020, the Controlling Company acquired 1,400,000 shares (59.8%) of KT Engineering Co., Ltd. (formerly KT ENG Core) and 940,000 shares (40.2%) of KT Estate, a subsidiary of the Group, to cultivate an engineering company in the group through early normalization and termination of corporate rehabilitation of KT Engineering Co., Ltd. (formerly KT ENG Core). Through these transactions, KT Engineering Co., Ltd. (formerly KT ENG Core Co., Ltd.) was included as a subsidiary, and it was accounted for in accordance with IFRS 3 Business Combinations.

As a result of applying the acquisition method, identifiable intangible assets of ￦ 3 million and goodwill of ￦ 407 million were generated.

As of the acquisition date of control, the total consideration transferred, the recognized amount of assets acquired and liabilities acquired by major types, and calculation details of goodwill are as follows:

(In millions of Korean won)	Amount
Total transfer cost (a)	￦	46,800
Recognized amount of assets acquired and liabilities assumed (b)1		46,393
Cash and cash equivalents		57,845
Trade and other receivable		95,814
Other financial assets		3,110
Other assets		14,021
Inventories		1,521
Property and equipment		3,128
Intangible assets		410
Trade and other payables		(105,964	)
Other liabilities		(4,815	)
Current income tax liabilities		(3,664	)
Other provisions		(13,745	)
Retirement benefit liabilities		(1,268	)
Goodwill (a-b)	￦	407

1 Assets acquired and liabilities acquired in accordance with IFRS 3 Business Combinations are measured at fair value.

As at December 31, 2020, goodwill is subject to change as the underwriting results of fair value valuation of identifiable asset liabilities for allocation of consideration has not been confirmed.

After the acquisition of control, operating income included in the consolidated statement before the removal of intercompany transactions is ￦ 250,380 million and net loss is ￦ 1,948 million. Had KT Engineering (KT ENGCORE Co., Ltd.) consolidated on January 1, 2020, the operating revenue that would be included is ￦ 387,697 million and the net loss for the year is ￦ 8,461 million.

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Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty

41. Changes in Accounting Policies – Determination of Lease Term Considering Economic Penalty

From January 1, 2020, the Group has changed its accounting policy by adopting accounting treatments in accordance with agenda decisions for ‘Lease Term and Useful Life of Leasehold Improvements’ issued by IFRS Interpretations Committee on December 16, 2019. The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable. The changes in accounting policy have been adopted retrospectively in accordance with IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, and comparatives for the 2019 financial year have been adjusted.

In relation to the changes in accounting policy, the adjusted amounts recognized in each line item in the consolidated financial statements are as follows:

Consolidated Statements of Financial Position

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Current assets
Prepaid expenses	￦	76,036	￦	(1,026	)	￦	75,010	￦	61,930	￦	(2,119	)	￦	59,811
Non-current assets
Right-of-use assets		788,497		479,832			1,268,329		585,034		632,145			1,217,179
Current liabilities
Lease liabilities	￦	355,833	￦	36,600		￦	392,433	￦	281,961	￦	63,263		￦	345,224
Non-current liabilities
Lease liabilities		373,307		445,612			818,919		231,884		566,532			798,416
Total liabilities	￦	729,140	￦	482,212		￦	1,211,352	￦	513,845	￦	629,795		￦	1,143,640
Net assets
Retained earnings	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420
Total equity	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420

Consolidated Statements of Operations

	2019							2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Operating revenue	￦	24,899,189	￦	—		￦	24,899,189	￦	24,434,851	￦	5,796		￦	24,440,647
Operating expenses		23,879,015		(6,796	)		23,872,219		23,425,377		(7,063	)		23,418,314
Finance income		424,395		—			424,395		498,614		—			498,614
Finance costs		421,931		10,202			432,133		498,161		9,222			507,383
Income tax expense		320,060		—			320,060		285,349		—			285,349
Profit for the year		699,274		(3,406	)		695,868		742,619		3,637			746,256
Basic earnings per share		2,648		(14	)		2,634		2,843		15			2,858
Diluted earnings per share		2,646		(14	)		2,632		2,840		18			2,858

With the initial adoption of IFRS 16 Lease, right-of-use assets and lease liabilities increased by ￦ 899,783 million and ￦ 643,375 million, respectively, as at January 1, 2019. In consideration of the economic penalties to be incurred from the contractual obligations, changes in accounting policy in relation to lease term resulted in an additional increase to the beginning balance of right-of-use assets and lease liabilities, by the amount of ￦ 128,035 million and ￦ 128,035 million, respectively, for the year as at January 1, 2019 (Note 33).

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Events after Reporting Period

12 Months Ended

Dec. 31, 2020

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Events after Reporting Period

42. Events After Reporting Period

The Group has issued the following bonds since the end of the reporting period.

Type	Issued date		Face value (In millions of Korean won)		Interest rate			Redemption date
The 194-1st Public bond		Jan. 27, 2021	￦	130,000		1.13	%		Jan. 26, 2024
The 194-2nd Public bond		Jan. 27, 2021		140,000		1.45	%		Jan. 27, 2026
The 194-3rd Public bond		Jan. 27, 2021		50,000		1.85	%		Jan. 27, 2031
The 194-4th Public bond		Jan. 27, 2021		80,000		1.98	%		Jan. 25, 2041

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Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

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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 financial statements have been prepared on a historical cost basis, except for the following:

• Certain financial assets and liabilities (including derivative instruments) – measured at fair value

• Assets held-for-sale – measured at fair value less costs to sell

• Defined benefit pension plans – plan assets measured at fair value

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.

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, 2020.

- Amendments to IAS 1 Presentation of Financial Statements and IAS 8 Accounting policies, changes in accounting estimates and errors – Definition of Material

The amendments clarify the definition of material. Information is material if omitting, misstating or obscuring it could reasonably be expected to influence the decisions that the primary users of general-purpose financial statements make on the basis of those financial statements. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 3 Business Combination – Definition of a Business

The amended definition of a business requires an acquisition to include an input and a substantive process that together significantly contribute to the ability to create outputs and the definition of output excludes the returns in the form of lower costs and other economic benefits. If substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or group of similar identifiable assets, an entity may elect to apply an optional concentration test that permits a simplified assessment of whether an acquired set of activities and assets is not a business. The amendments do not have a significant impact on the consolidated financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement and IFRS 7 Financial Instruments: Disclosure – Interest Rate Benchmark Reform

The amendments allow to apply the exceptions when forward-looking analysis is performed in relation the application of hedge accounting, while uncertainties arising from interest rate benchmark reform exist. The exceptions require the Group assumes that the interest rate benchmark, on which the hedged items and the hedging instruments are based on, is not altered as a result of interest rate benchmark reform, when determining whether the expected cash flows are highly probable, whether an economic relationship between the hedged item and the hedging instrument exists, and when assessing the hedging relationship is highly effective.

The Group’s risk exposure, directly affected by the interest rate benchmark reform, is the variable rate borrowings of USD 519,598,989 and SGD 284,000,000 with maximum remaining maturity of four years. To hedge fluctuations in cash flows of borrowings resulting from the changes in USD LIBOR of 3 months and SGD SOR of 6 months—an interest rate benchmark, the Group entered into an interest rate swap contract for a nominal amount of USD 519,598,989 and SGD 284,000,000 and designated it as a hedging instrument of cash flow hedge.

- Agenda Decision of the International Accounting Standards Interpretations Committee – Lease Period

The IFRS Interpretations Committee (IFRS IC) announced on December 16, 2019 that all economic penalties resulting from the termination of a lease are taken into account when determining the enforceable period for ‘Lease Term and Useful Life of Leasehold Improvements’. The Group’s changes in accounting policy have been adopted retrospectively in accordance with IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors, and the comparative financial statements as at December 31, 2019 and for the year then ended have been adjusted (Note 41).

(2) New standards and interpretations not yet adopted by the Group

The following new accounting standards and interpretations have been published that are not mandatory for December 31, 2020 reporting periods and have not been early adopted by the Group.

- Amendments to IFRS 16 Lease – Practical expedient for COVID-19—Related Rent Exemption, Concessions, Suspension

As a practical expedient, a lessee may elect not to assess whether a rent concession occurring as a direct consequence of the COVID-19 pandemic is a lease modification, and the amounts recognized in profit or loss as a result of applying this exemption should be disclosed. The amendments should be applied for annual periods beginning on or after June 1, 2020, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IFRS 9 Financial Instruments, IAS 39 Financial Instruments: Recognition and Measurement, IFRS 7 Financial Instruments: Disclosure, IFRS 4 Insurance Contracts and IFRS 16 Lease – Interest Rate Benchmark Reform

In relation to interest rate benchmark reform, the amendments provide exceptions including adjust effective interest rate instead of book amounts when interest rate benchmark of financial instruments at amortized costs is replaced, and apply hedge accounting without discontinuance although the interest rate benchmark is replaced in hedging relationship. The amendments should be applied for annual periods beginning on or after January 1, 2021, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IFRS 3 Business Combination – Reference to the Conceptual Framework

The amendments update a reference of definition of assets and liabilities qualify for recognition in revised Conceptual Framework for Financial Reporting. However, the amendments add an exception for the recognition of liabilities and contingent liabilities within the scope of IAS 37 Provisions, Contingent Liabilities and Contingent Assets, and IFRIC 21 Levies. The amendments also confirm that contingent assets should not be recognized at the acquisition date. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Amendments to IAS 16 Property, Plant and Equipment—Proceeds Before Intended Use

The amendments prohibit an entity from deducting from the cost of an item of property, plant and equipment any proceeds from selling items produced while the entity is preparing the asset for its intended use. Instead, the entity will recognize the proceeds from selling such items, and the costs of producing those items, in profit or loss. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

- Amendments to IAS 37 Provisions, Contingent Liabilities and Contingent Assets—Onerous Contracts: Cost of Fulfilling a Contract

The amendments clarify that the direct costs of fulfilling a contract include both the incremental costs of fulfilling the contract and an allocation of other costs directly related to fulfilling contracts when assessing whether the contract is onerous. The amendments should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

- Annual improvements to IFRS 2018-2020

Annual improvements of IFRS 2018-2020 Cycle should be applied for annual periods beginning on or after January 1, 2022, and earlier application is permitted. The Group does not expect that these amendments have a significant impact on the financial statements.

• IFRS 1 First time Adoption of Korean International Financial Reporting Standards – Subsidiaries that are first-time adopters

• IFRS 9 Financial Instruments – Fees related to the 10% test for derecognition of financial liabilities

• IFRS 16 Leases – Lease incentives

• IAS 41 Agriculture – Measuring fair value

- Amendments to IAS 1 Presentation of Financial Statements—Classification of Liabilities as Current or Non-Current

The amendments clarify that liabilities are classified as either current or non-current, depending on the substantive rights that exist at the end of the reporting period. Classification is unaffected by the likelihood that an entity will exercise right to defer settlement of the liability or the expectations of management. Also, the settlement of liability include the transfer of the entity’s own equity instruments, however, it would be excluded if an option to settle them by the entity’s own equity instruments if compound financial instruments meets the definition of equity instruments and is recognized separately from the liability. The amendments should be applied for annual periods beginning on or after January 1, 2023, and earlier application is permitted. The Group is in review for the impact of these amendments on the financial statements.

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 entities over which the Group has significant influence but does not possess control or joint control. Investments in associates are accounted for using the equity method of accounting, after initially being recognized at cost. Unrealized gains on transactions between the Group and its associates are eliminated to the extent of the Group’s interest in the associates. If the Group’s share of losses of an associate equals or exceeds its interest in the associate (including long-term interests that, in substance, form part of the Group’s net investment in the associate), the Group discontinues recognizing its share of further losses. After the Group’s interest is reduced to zero, additional losses are provided for, and a liability is recognized, only to the extent that the Group has incurred legal or constructive obligations or made payments on behalf of the associate. If there is an objective evidence of impairment for the investment in the associate, the Group recognizes the difference between the recoverable amount of the associate and its book amount as impairment loss. If an associate uses accounting policies other than those of the Group for transactions and events in similar circumstances, if necessary, adjustments shall be made to make the associate’s accounting policies conform to those of the Group when the associate’s financial statements are used by the Group in applying the equity method.

(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 that relate to borrowings are presented in the consolidated statements of operations, within finance costs. All other foreign exchange gains and losses are presented in the consolidated statements of operations within operating revenue or operating expenses.

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 consolidated statements of operations 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 comprise cash balances, call deposits and investment securities with

maturities of three months or less from the acquisition date that are easily convertible to cash and

subject to an insignificant risk of changes in their fair value.

Financial Assets

2.7 Financial Assets

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, the Group recorded the cumulative effect as at the date of the initial application of the standards as an adjustment to the initial balance in the retained earnings.

(1) Classification

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 consolidated statements of operations 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 consolidated statements of operations 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 the amount of consideration that is unconditional, unless they contain significant financing components when they are recognized at fair value. Trade receivables are 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.

Assets (or Disposal Group) Held-for-sale

2.11 Assets (or Disposal Group) Held-for-sale

Assets(or disposal group) are classified as assets held for sale when their carrying amount will be recovered principally through a sale transaction rather than through continued use and when a sale is considered highly probable. The assets are measured at the lower amount between their carrying amount and the fair value less selling costs.

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 are directly attributable to the acquisition of the items.

Depreciation of all property 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 (1) and goodwill arising from acquisition of subsidiaries and business are included in intangible assets. Goodwill is tested at least 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 at least 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	4 – 6 years
Frequency usage rights	5 – 10 years
Others1	1 – 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 consolidated statements of operations.

Impairment of Non-Financial Assets

2.17  Impairment of Non-Financial Assets

Goodwill and intangible assets with indefinite useful life are tested at least annually for impairment at the end of each reporting period. If certain assets are deemed to be impaired, their recoverable amount is estimated in order to determine the impairment loss. The Group estimates the recoverable amount for each asset, and in cases when the recoverable amount cannot be estimated for an asset, the recoverable amount of the cash generating unit to which the asset belongs is estimated. Corporate assets are allocated to individual cash generating units on a reasonable and consistent basis and if they cannot be allocated to individual cash generating units, they are allocated to the smallest group of cash generating units on a reasonable and consistent basis. An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount (higher of its fair value less costs of disposal and value in use). Impairment loss on non-financial assets other than goodwill are evaluated for reversal 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 measured 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.

All non-derivative financial liabilities except the following are classified as financial liabilities measured at amortized cost.

• Financial liabilities at fair value through profit or loss

• Financial guarantee contract

• Financial liabilities arising when the transfer of financial assets does not meet the elimination conditions

Financial liabilities measured at amortized cost are displayed in the statement of financial position as ‘Trade and other payables’, ‘Borrowings’ and ‘Other financial liabilities’.

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 consolidated statements of operations 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 they are 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

• 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 at least 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 at least 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, recoveries, litigations and claims, and others are recognized when the Group presently hold legal or constructive obligation as a result of past events, and when 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

As at January 1, 2019, with implementation of IFRS 16 Leases, the Group has changed accounting policy. The Group has adopted IFRS 16 modified retrospectively, as permitted under the specific transitional provisions in the standard, and recognized the cumulative impact of initially applying the standard as at January 1, 2019.

As explained in “Note 2.2 (1)” above, the Group has changed its accounting policy for leases. The impact of the new accounting policies is disclosed in Note 41.

(1) Lessee

The Group leases various repeater server rack, offices, track facilities, machinery and cars.

Contracts may contain both lease and non-lease components. The Group allocates the consideration in the contract to the lease and non-lease components based on their relative stand-alone prices. However, for leases of real estate for which the Group is lessee, the Group applies the practical expedient which has elected not to separate lease and non-lease components and instead accounts them as a single lease component.

Assets and liabilities arising from a lease are initially measured on a present value basis. Lease liabilities include the net present value of the following lease payments:

• Fixed payments (including in-substance fixed payments), less any lease incentives receivable

• Variable lease payment that are based on an index or a rate, initially measured using the index or rate as at the commencement date

• Amounts expected to be payable by the Group (the lessee) under residual value guarantees

• The exercise price of a purchase option if the Group (the lessee) is reasonably certain to exercise that option, and

• Payments of penalties for terminating the lease, if the lease term reflects the Group (the lessee) exercising that option

Lease liability measurement also include payments to be made in option periods if the lessee is reasonably certain in exercising an option to extend the lease.

The Group determines the lease term as the non-cancellable period of a lease, together with both (a) periods covered by an option to extend the lease if the lessee is reasonably certain to exercise that option; and (b) periods covered by an option to terminate the lease if the lessee is reasonably certain not to exercise that option. When the lessee and the lessor each has the right to terminate the lease without permission from the other party, the Group should consider a termination penalty in determining the period for which the contract is enforceable.

The lease payments are discounted using the interest rate implicit in the lease. If that rate cannot be determined, the lessee’s incremental borrowing rate is used, which is the rate that the lessee would have to pay to borrow the funds necessary to obtain an asset of similar value in a similar economic environment with similar terms and conditions.

The Group is exposed to potential future increases in variable lease payments based on an index or rate, which are not included in the lease liability until they take effect. When adjustments to lease payments based on an index or rate take effect, the lease liability is reassessed and adjusted against the right-of-use asset.

Each lease payment is allocated between the liability and finance cost. The finance cost is charged to profit or loss over the lease period in order to produce a constant periodic rate of interest on the remaining balance of the liability for each period.

Right-of-use assets are measured at cost comprising the following:

• amount of the initial measurement of lease liability

• any lease payments made at or before the commencement date less any lease incentives received

• any initial direct costs (leasehold deposits)

• restoration costs, and

• present value discount on leasehold deposit

The right-of-use asset is depreciated over the shorter of the asset’s useful life and the lease term on a straight-line basis. If the Group is reasonably certain to exercise a purchase option, the right-of-use asset is depreciated over the underlying asset’s useful life.

Payments associated with short-term leases and leases of low-value assets are recognized on a straight-line basis as an expense in profit or loss. Short-term leases are leases with a lease term of 12 months or less, such as mechanical devices and cars. Low-value assets are comprised of tools, equipment, and others.

(2) Lessor

Lease income from operating leases where the Group is a lessor is recognized in income on a straight- line basis over the lease term. Initial direct costs incurred in obtaining an operating lease are added to the carrying amount of the underlying asset and recognized as expense over the lease term on the same basis as lease income. The respective leased assets are included in the statement of financial position based on their nature.

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 modified 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 modified 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 are considered a separate performance obligations. 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 profit.

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, 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 fees 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 for 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 liabilities are offset when the Group has a legally enforceable right to offset and intends either to settle on a net basis, or to realize the assets and settle the liability simultaneously.

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 consolidated financial statements in the period in which the dividends are approved by the Group’s shareholders.

Approval of the Consolidated Financial Statements

2.29 Approval of the Consolidated Financial Statements

The consolidated financial statements for 2020 were approved for issuance by the Board of Directors on April 13, 2021.  

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General Information (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Consolidated Subsidiaries

The consolidated subsidiaries as at December 31, 2019 and 2020, are as follows:

			Controlling percentage ownership1
Subsidiary	Type of business	Location	December 31, 2019	December 31, 2020	Closing month
KT Powertel Co., Ltd. 2	Trunk Radio System (TRS) business	Korea	44.8%	44.8%	December
KT Linkus Co., Ltd.	Public telephone maintenance	Korea	92.4%	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.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
KT Strategic Investment Fund No.5	Investment fund	Korea	100.0%	100.0%	December
BC-VP Strategic Investment Fund No.1	Investment fund	Korea	100.0%	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	64.5%	64.5%	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) 2,4	Online music production and distribution	Korea	36.0%	36.2%	December
KT MOS Bukbu Co., Ltd. 4	Telecommunication facility maintenance	Korea	100.0%	100.0%	December
KT MOS Nambu Co., Ltd. 4	Telecommunication facility maintenance	Korea	98.4%	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
KTGDH Co., Ltd. (KTSB Data Service)	Data centre development and related service	Korea	100.0%	100.0%	December
KT Sat Co., Ltd.	Satellite communication business	Korea	100.0%	100.0%	December
Nasmedia Co., Ltd.3,4	Solution provider and IPTV advertisement sales business	Korea	44.0%	44.0%	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 Contents Fund	Content investment business	Korea	88.6%	88.6%	December
Autopion Co., Ltd.	Information and communication service	Korea	100.0%	100.0%	December
KTCS Corporation 2,4	Database and online information provider	Korea	30.9%	31.9%	December
KTIS Corporation 2,4	Database and online information provider	Korea	30.1%	30.8%	December
KT M Mobile Co., Ltd.	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	Korea	100.0%	70.4%	December
Next Connect PFV	Residential building development and supply	Korea	100.0%	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
Korea Telecom Japan Co., Ltd.	Foreign telecommunication business	Japan	100.0%	100.0%	December
KBTO sp.z o.o.	Electronic communication business	Poland	97.2%	97.4%	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
East Telecom LLC	Fixed line telecommunication business	Uzbekistan	91.0%	91.6%	December
Korea Telecom America, Inc.	Foreign telecommunication business	USA	100.0%	100.0%	December
PT. BC Card Asia Pacific	Software development and supply	Indonesia	99.9%	99.9%	December
KT Hong Kong Telecommunications Co., Ltd.	Fixed line communication business	Hong Kong	100.0%	100.0%	December
Korea Telecom Singapore Pte. Ltd.	Foreign investment business	Singapore	100.0%	100.0%	December
Texnoprosistem LLC	Fixed line internet business	Uzbekistan	100.0%	100.0%	December
Nasmedia Thailand Co., Ltd.	Internet advertising solution provider	Thailand	99.9%	99.9%	December
KT Huimangjieum	Manufacturing	Korea	100.0%	100.0%	December
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.	Residential building investment and rent	Korea	63.5%	68.1%	December
K-REALTY RENTAL HOUSING REIT 3	Residential building	Korea	100.0%	88.6%	December
Storywiz Co., Ltd	Content and software development and supply	Korea	—	100.0%	December
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Telecommunication facility construction and maintenance	Korea	—	100.0%	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 2020 are as follows:

Changes	Location	Name of Subsidiary	Reason
Included	Korea	Storywiz Co., Ltd	Newly established
	Korea	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)	Transferred
Excluded	Uzbekistan	Super iMax LLC	Merged
	Indonesia	PT. KT Indonesia	Liquidated
	Belgium	KT ORS Belgium	Liquidated

Summarized information for consolidated subsidiaries as at and for the years ended December 31, 2018, 2019 and 2020, is as follows:

(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
KTGDH Co., Ltd. (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 Co., Ltd.		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.

(In millions of Korean won)	2019
	Total assets		Total liabilities		Operating revenue		Profit (loss) for the year
KT Powertel Co., Ltd.	￦	118,052	￦	19,766	￦	62,846	￦	3,085
KT Linkus Co., Ltd.		70,494		62,088		97,892		(2,258	)
KT Submarine Co., Ltd.		120,947		18,452		55,244		486
KT Telecop Co., Ltd.		279,878		153,841		332,063		(4,875	)
KT Hitel Co., Ltd.		279,818		74,769		323,065		1,426
KT Service Bukbu Co., Ltd.		64,802		58,984		219,427		(445	)
KT Service Nambu Co., Ltd.		63,917		55,548		266,148		280
BC Card Co., Ltd.1		3,912,982		2,594,232		3,553,008		115,885
H&C Network1		282,016		68,401		320,701		(1,593	)
Nasmedia Co., Ltd.1		356,236		203,105		117,550		22,484
KTDS Co., Ltd.1		158,153		105,462		428,758		9,027
KT M Hows Co., Ltd.		74,326		50,638		33,443		6,771
KT M&S Co., Ltd.		248,142		215,777		813,498		12,732
GENIE Music Corporation (KT Music Corporation)		234,131		80,952		230,480		7,658
KT MOS Bukbu Co., Ltd.		33,376		28,841		63,761		353
KT MOS Nambu Co., Ltd.		34,258		26,722		67,300		3,099
KT Skylife Co., Ltd.1		848,276		142,839		704,996		56,008
KT Estate Inc.1		1,686,000		295,706		485,686		48,552
KTGDH Co., Ltd. (KTSB Data service)		10,437		1,628		3,977		344
KT Sat Co., Ltd.		651,195		127,523		168,376		16,497
KT Sports Co., Ltd.		15,603		8,333		55,241		(464	)
KT Music Contents Fund No.1		10,579		1,677		521		345
KT Music Contents Fund No.2		7,675		279		331		48
KT-Michigan Global Content Fund		11,688		61		248		(1,113	)
Autopion Co., Ltd.		7,460		4,894		5,604		(302	)
KT M mobile Co., Ltd.		135,917		30,603		161,720		(5,580	)
KT Investment Co., Ltd.1		73,463		56,212		13,375		847
KTCS Corporation1		378,171		213,983		944,778		7,597
KTIS Corporation		305,798		137,524		454,561		9,205
Next connect PFV		385,412		24,275		1,590		(5,898	)
Korea Telecom Japan Co., Ltd.1		1,851		2,858		2,891		651
Korea Telecom China Co., Ltd.		879		39		844		192
KT Dutch B.V.		31,003		50		—		(242	)
Super iMax LLC		3,568		5,304		4,604		(631	)
East Telecom LLC1		20,857		16,302		17,186		2,140
Korea Telecom America, Inc.		4,611		537		6,808		572
PT. KT Indonesia		8		—		—		—
KT Rwanda Networks Ltd.2		132,461		183,164		18,013		(31,662	)
KT Belgium		93,321		11		—		(64	)
KT ORS Belgium		6,913		14		—		(43	)
KBTO sp.zo.o.		1,767		245		519		(3,457	)
AOS Ltd.2		12,337		3,993		6,982		(591	)
KT Hongkong Telecommunications Co., Ltd.		5,126		2,923		13,321		586
KT Huimangjieum		2,129		1,019		1,027		(390	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		6,285		1,139		176		70
K-REALTY RENTAL HOUSING REIT 3		300		—		—		—

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.

(In millions of Korean won)	2020
	Total assets		Total liabilities		Operating revenues			Profit (loss) for the year
KT Powertel Co., Ltd.	￦	119,694	￦	18,833	￦	65,897		￦	3,809
KT Linkus Co., Ltd.		58,372		54,022		84,519			(3,212	)
KT Submarine Co., Ltd.		116,813		14,032		110,201			1,197
KT Telecop Co., Ltd.		318,456		193,737		392,489			212
KT Hitel Co., Ltd.		288,949		92,599		350,231			2,080
KT Service Bukbu Co., Ltd.		60,825		56,554		217,451			(871	)
KT Service Nambu Co., Ltd.		58,182		51,460		264,776			(456	)
BC Card Co., Ltd. 1		3,084,398		1,778,751		3,387,640			39,455
H&C Network 1		269,651		61,365		322,690			2,413
Nasmedia Co., Ltd. 1		422,039		221,371		113,136			23,134
KTDS Co., Ltd. 1		183,297		133,129		499,990			10,635
KT M Hows Co., Ltd.		104,704		76,315		44,860			6,935
KT M&S Co., Ltd.		231,260		197,306		661,533			(485	)
GENIE Music Corporation (KT Music Corporation)		250,538		88,488		247,237			9,472
KT MOS Bukbu Co., Ltd.		32,167		26,070		67,975			1,473
KT MOS Nambu Co., Ltd.		33,765		24,947		71,259			1,639
KT Skylife Co., Ltd. 1		919,476		175,039		706,631			58,190
KT Estate Inc. 1		1,689,601		325,429		365,335			14,370
KTGDH Co., Ltd. (KTSB Data Service)		11,003		1,669		4,282			538
KT Sat Co., Ltd.		630,740		92,791		173,693			14,753
KT Sports Co., Ltd.		26,572		14,940		46,608			(2,516	)
KT Music Contents Fund No.1		4,844		1,525		243			84
KT Music Contents Fund No.2		15,021		285		169			(116	)
KT-Michigan Global Contents Fund		10,382		175		111			(1,420	)
Autopion Co., Ltd.		4,903		4,961		6,174			(2,459	)
KT M Mobile Co., Ltd.		129,011		27,281		163,472			(3,617	)
KT Investment Co., Ltd. 1		115,627		93,695		47,801			4,680
KTCS Corporation 1		384,919		215,175		933,006			11,323
KTIS Corporation		294,289		126,894		454,172			7,387
Next Connect PFV		394,268		37,271		26			(7,101	)
Korea Telecom Japan Co., Ltd. 1		2,694		2,622		1,853			1
Korea Telecom China Co., Ltd.		381		21		618			(492	)
KT Dutch B.V. 1		29,585		10,109		26,782			6,061
Korea Telecom America, Inc.		4,498		125		6,808			712
KT Rwanda Networks Ltd. 2		114,768		191,781		17,870			(34,610	)
KT Belgium		87,608		—		(81	)		(81	)
KBTO sp.z o.o.		438		117		490			(2,823	)
AOS Ltd. 2		11,812		3,875		5,719			296
KT Hong Kong Telecommunications Co., Ltd.		6,159		2,800		16,386			1,308
KT Huimangjieum		3,720		2,787		5,239			(13	)
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.		5,703		1,165		333			83
Storywiz Co., Ltd		21,594		10,065		19,209			(1,954	)
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)		138,220		102,963		346,040			(8,461	)

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, 2020

Text block [abstract]

Summary of Estimated Useful Lives of Property, Plant and Equipment

Depreciation of all property 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	4 – 6 years
Frequency usage rights	5 – 10 years
Others1	1 – 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, 2020

Text block [abstract]

Summary of Financial Instruments by Category

Financial instruments by category as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
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	￦	2,305,894	￦	—	￦	—	￦	—	￦	2,305,894
Trade and other receivables1		5,748,459		—		1,256,266		—		7,004,725
Other financial assets		441,804		632,324		557,342		58,576		1,690,046

1 Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2019
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	￦	8,679,698	￦	—	￦	—	￦	8,679,698
Borrowings		7,298,867		—		—		7,298,867
Other financial liabilities		129,945		38		20,096		150,079

(In millions of Korean won)	December 31, 2020
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	￦	2,634,624	￦	—	￦	—	￦	—	￦	2,634,624
Trade and other receivables1		4,976,423		—		1,118,619		—		6,095,042
Other financial assets		671,068		809,919		258,516		7,684		1,747,187

1 Lease receivables and others which are not applied to financial instruments by category are excluded.

(In millions of Korean won)	December 31, 2020
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	￦	7,017,639	￦	—	￦	—	￦	7,017,639
Borrowings		7,316,298		—		—		7,316,298
Other financial liabilities		132,558		2,682		127,929		263,169

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, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Financial assets at amortized cost
Interest income1,5	￦	93,233		￦	79,838		￦	55,742
Gain(loss) on foreign currency transaction4		19,396			32,293			(19,244	)
Loss on foreign currency translation4		(2,901	)		(474	)		(3,895	)
Gain(loss) on disposal		44			(43	)		138
Loss on valuation		(110,544	)		(59,947	)		(140,474	)
Financial assets at fair value through profit or loss
Interest income1		9,194			5,634			6,548
Dividend income6		1,207			1,096			4,379
Gain on valuation7		10,768			4,334			59,044
Gain on disposal		1,713			5,115			(329	)
Loss on foreign currency transaction4		—			—			(38	)
Loss on foreign currency translation4		—			(27	)		—
Financial assets at fair value through other comprehensive income
Interest income1		163,390			217,355			227,736
Dividend income6		1,704			2,312			56
Impairment loss		(2,416	)		(304	)		—
Loss on disposal		(13,818	)		(11,247	)		(8,152	)
Other comprehensive income for the year2		43,811			167,152			41,997
Derivative assets used for hedging
Gain on transaction		7,272			6,332			6,050
Gain(loss) on valuation		22,065			56,537			(2,707	)
Other comprehensive income(loss) for the year2		20,078			46,806			(2,373	)
Reclassified to profit or loss from other comprehensive income for the year2,3		(15,891	)		(39,604	)		3,645
Financial liabilities at fair value through profit or loss
Gain on disposal		—			2,664			799
Gain(loss) on valuation		(2,708	)		(1,936	)		119
Derivative liabilities used for hedging
Gain on transactions		20,678			—			1,141
Gain(loss) on valuation		42,195			4,949			(161,003	)
Other comprehensive income for the year2		(2,810	)		20,742			(81,671	)
Reclassified to profit or loss from other comprehensive income for the year 2,3		(28,388	)		(5,080	)		107,786
Financial liabilities at amortized cost
Interest expense1,5		(296,894	)		(223,974	)		(220,945	)
Loss on repayment		(15	)		—			—
Loss on foreign currency transaction4		(30,956	)		(20,958	)		(10,717	)
Gain(loss) on foreign currency translation4		(66,050	)		(75,502	)		141,849
Total	￦	(116,643	)	￦	214,063		￦	5,481

1 BC Card, a subsidiary of the Group, recognized interest income and expense as operating revenue and expense, respectively. Related interest income recognized as operating revenue is ￦ 20,854 million (2018: ￦ 21,021 million, 2019: ￦ 21,018 million) and interest expense recognized as operating expense is ￦ 1,456 million (2018: ￦ 21 million, 2019: ￦ 548 million) for the year ended December 31, 2020.

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 Co., Ltd., a subsidiary of the Group recognized foreign currency translation/transaction gain and loss and as operating income and expenses. In relation to this, foreign currency translation gain and loss recognized as operating revenue and expense amount to ￦ 56 million (2018: ￦ 0 million. 2019: ￦ 5 million) and ￦ 19,687 million (2018: ￦ 20,422 million, 2019: ￦ 17,006 million), respectively, for the year ended December 31, 2020.

5 Interest income (interest expense) from lease receivables (lease liabilities) is excluded as it is not subject to classification of financial instruments (Note 21).

6 BC Card Co., Ltd., a subsidiary of the Group, recognized dividend income as operating revenue. Related dividend income recognized as operating revenue is ￦ 2,059 million (2018: ￦ 1,598 million, 2019: ￦ 2,250 million) for the year ended December 31, 2020.

7 KT Investment Co., Ltd., etc., subsidiaries of the Group, recognized financial instruments measured at fair value through profit or loss as operating income and expenses. In relation to this, valuation gain and loss recognized as operating revenue and expense amount to ￦ 40,822 million (2018: ￦ (-) 5 million, 2019: ￦ 15,429 million), for the year ended December 31, 2020.

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Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Restricted Cash and Cash Equivalents

Restricted cash and cash equivalents as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019	December 31, 2020	Description
Bank deposits	￦21,290	￦28,414	Deposit restricted for government project and others

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Trade and Other Receivables (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Trade and Other Receivables

Trade and other receivables as at December 31, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,451,107	￦	(291,202	)	￦	(9,510	)	￦	3,150,395
Other receivables		2,787,144		(78,572	)		(271	)		2,708,301
	￦	6,238,251	￦	(369,774	)	￦	(9,781	)	￦	5,858,696
Non-current assets
Trade receivables	￦	874,860	￦	(4,117	)	￦	(43,597	)	￦	827,146
Other receivables		382,468		(5,108	)		(22,708	)		354,652
	￦	1,257,328	￦	(9,225	)	￦	(66,305	)	￦	1,181,798

	December 31, 2020
(In millions of Korean won)	Total amounts		Provision for impairment			Present value discount			Carrying amount
Current assets
Trade receivables	￦	3,388,099	￦	(322,992	)	￦	(8,977	)	￦	3,056,130
Other receivables		1,948,108		(101,619	)		(148	)		1,846,341
	￦	5,336,207	￦	(424,611	)	￦	(9,125	)	￦	4,902,471
Non-current assets
Trade receivables	￦	892,992	￦	(4,323	)	￦	(34,716	)	￦	853,953
Other receivables		513,926		(102,985	)		(14,125	)		396,816
	￦	1,406,918	￦	(107,308	)	￦	(48,841	)	￦	1,250,769

Summary of Changes in Provision for Impairment

Details of changes in provision for impairment for the years ended December 31, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Trade receivables			Other receivables			Trade receivables			Other receivables
Beginning balance	￦	359,924		￦	93,822		￦	295,319		￦	83,680
Provision		24,596			35,597			89,097			50,860
Reversal		—			(475	)		—			(890	)
Written-off or transfer out		(90,513	)		(44,108	)		(60,598	)		(25,067	)
Change in consolidation scope		—			—			3,211			87,614
Others		1,312			(1,156	)		286			8,407
Ending balance	￦	295,319		￦	83,680		￦	327,315		￦	204,604

Summary of Other Receivables

Details of other receivables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Loans	￦	84,148		￦	116,082
Receivables1		2,540,315			1,699,608
Accrued income		8,630			6,901
Refundable deposits		352,293			350,180
Loans receivable		105,961			150,527
Finance lease receivables		39,726			64,047
Others		15,560			60,416
Less: Provision for impairment		(83,680	)		(204,604	)
	￦	3,062,953		￦	2,243,157

1 Settlement receivables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 986,384 million related to debit and credit card transactions are included as at December 31, 2020 (2019: ￦ 1,786,610 million).

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Other Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Other Financial Assets and Liabilities

Details of other financial assets and liabilities as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other financial assets
Financial assets at amortized cost1	￦	441,804		￦	671,068
Financial assets at fair value through profit or loss1,2,3		632,324			809,919
Financial assets at fair value through other comprehensive income1,3		557,342			258,516
Derivative used for hedging		58,576			7,684
Less: Non-current		(821,658	)		(544,347	)
Current	￦	868,388		￦	1,202,840
Other financial liabilities
Financial liabilities at amortized cost	￦	129,945		￦	132,558
Financial liabilities at fair value through profit or loss		38			2,682
Derivatives used for hedging		20,096			127,929
Less: Non-current		(149,136	)		(260,676	)
Current	￦	943		￦	2,493

1 As at December 31, 2020, the Group’s other financial assets amounting to ￦ 104,442 million (2019: ￦ 91,445 million), which consist of checking account deposits and payment guarantee, are subject to withdrawal restrictions.

2 As at December 31, 2020, MMW (Money Market Wrap) and MMT (Money Market Trust) amounting to ￦ 509,068 million (2019: ￦ 406,062 million) is included in other financial assets.

3 As at December 31, 2020, the Group provided investments in Korea Software Financial Cooperative amounting to ￦ 5,491 million (2019: ￦ 1,849 million) as a collateral for the payment guarantee provided by the Cooperative.

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	232		￦	46,449
Equity Instruments (Unlisted)		90,357			83,017
Debt securities		541,657			680,453
Derivatives held for trading		78			—
Total		632,324			809,919
Less: non-current		(219,026	)		(276,109	)
Current	￦	413,298		￦	533,810

Summary of Financial Assets at Fair Value Through Other Comprehensive Income

Details of financial assets at fair value through other comprehensive income as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Equity Instruments (Listed)	￦	6,738		￦	6,216
Equity Instruments (Unlisted)		543,518			245,730
Debt securities		7,086			6,570
Total		557,342			258,516
Less: non-current		(556,147	)		(258,516	)
Current	￦	1,195		￦	—

Summary of Derivative Financial Assets and Liabilities

Derivatives used for hedging as at December 31, 2019 and 2020, are as follows:

	December 31, 2019						December 31, 2020
(In millions of Korean won)	Assets			Liabilities			Assets			Liabilities
Interest rate swap1	￦	—		￦	1,464		￦	—		￦	1,078
Currency swap2		55,569			18,632			7,684			126,189
Currency forwards3		3,007			—			—			662
Total		58,576			20,096			7,684			127,929
Less: non-current		(28,304	)		(19,177	)		(2,111	)		(126,408	)
Current	￦	30,272		￦	919		￦	5,573		￦	1,521

1 The interest rate swap contract is to hedge the risk of variability in future fair value of the borrowings.

2 The currency swap contract is to hedge the risk of variability in cash flow from the borrowings. 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.

Summary of Valuation Gains and Losses on Derivatives Contracts

The valuation gains and losses on the derivatives contracts for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018						2019						2020
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	￦	192	￦	—	￦	(488)	￦	—	￦	45	￦	(963)	￦	—	￦	—	￦	(567)
Currency swap		58,912		2,045		22,139		72,417		15,784		87,626		—		161,661		(113,175	)
Currency forwards		7,201		—		—		4,858		—		4,858		—		2,049		—
Total	￦	66,305	￦	2,045	￦	21,651	￦	77,275	￦	15,829	￦	91,521	￦	—	￦	163,710	￦	(113,742)

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 loss of ￦ 2,711 million for the current period (2018: valuation gain of ￦ 263 million, 2019: valuation gain of ￦ 4,181 million).

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	￦	38	￦	45
Conversion Rights and Redemption Rights		—		2,637
Total	￦	38	￦	2,682

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, 2018, 2019 and 2020, are as follows:

	2018				2019				2020
(In millions of Korean won)	Valuation gain		Valuation loss		Valuation gain		Valuation loss		Valuation gain		Valuation loss
Derivative liabilities held for trading	￦	—	￦	2,707	￦	78	￦	2,014	￦	10	￦	53
Conversion Rights and Redemption Rights		—		—		—		—		162		—
Total	￦	—	￦	2,707	￦	78	￦	2,014	￦	172	￦	53

Summary of Hedging instruments

(i) Hedging instruments

(In millions of Korean won and thousands of foreign currencies)	2019
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,574,068	￦	1,788,831	￦	30,175	￦	10,692	￦	49,480
JPY		80,000,000		827,292		28,401		9,404		15,396
Total			￦	2,616,123	￦	58,576	￦	20,096	￦	64,876

(In millions of Korean won and thousands of foreign currencies)	2020
					Book value of hedging instruments				Changes in fair value to calculate the ineffective portion of hedges
Currency	Foreign currency		Contract amount		Assets		Liabilities
USD		1,768,912	￦	2,037,568	￦	2,111	￦	100,623	￦	(136,852	)
JPY		46,000,000		488,924		5,573		13,839		(4,065	)
SGD		284,000		245,208		—		13,467		(13,611	)
Total			￦	2,771,700	￦	7,684	￦	127,929	￦	(154,528	)

Summary of Hedged items

(ii) Hedged item

(In millions of Korean won)
	2019								2020
Currency	Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges			Cash flow hedge reserves1			Book value of hedged items		Changes in fair value to calculate the ineffective portion of hedges		Cash flow hedge reserves1
USD	￦	1,822,477	￦	(45,855	)	￦	(5,214	)	￦	1,924,576	￦	133,978	￦	19,641
JPY		850,776		(14,841	)		(2,395	)		484,960		4,228		(2,569	)
SGD		—		—			—			233,510		13,611		2,707
Total	￦	2,673,253	￦	(60,696	)	￦	(7,609	)	￦	2,643,046	￦	151,817	￦	19,779

1 The amounts after adjustments of deferred income tax directly reflected in equity.

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Inventories (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Inventories Net

Inventories as at December 31, 2019 and 2020, are as follows:

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Acquisition cost		Valuation allowance			Book amount		Acquisition cost		Valuation allowance			Book amount
Merchandise	￦	805,691	￦	(144,438	)	￦	661,253	￦	650,856	￦	(133,224	)	￦	517,632
Others		130,424		—			130,424		17,004		—			17,004
Total	￦	936,115	￦	(144,438	)	￦	791,677	￦	667,860	￦	(133,224	)	￦	534,636

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Other Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Other Assets and Liabilities

Other assets and liabilities as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Other assets
Advance payments	￦	179,475		￦	168,302
Prepaid expenses		84,768			66,578
Contract cost1		1,849,243			1,804,948
Contract assets1		557,041			586,438
Others		14,243			18,747
Less: Non-current		(685,488	)		(768,661	)
Current	￦	1,999,282		￦	1,876,352
Other liabilities
Advances received1	￦	333,342		￦	328,491
Withholdings		99,844			105,415
Unearned revenue1		65,228			29,593
Lease liabilities		1,211,352			1,143,640
Contract liabilities1		365,610			384,133
Others		23,298			21,597
Less: Non-current		(1,030,117	)		(909,570	)
Current	￦	1,068,557		￦	1,103,299

1 The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

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Assets Held for Sale (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Assets Held for Sale

Details of assets held for sale are as follows:

(In millions of Korean won)	Amount
Land	￦	172
Buildings and Other		1,026
Total	￦	1,198

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Changes in Property and Equipment

Changes in property and equipment for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
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	)
Beginning, net		1,281,187			2,007,685			8,475,016			478,381			825,988			13,068,257
Changes in accounting policy1		—			(149	)		(12,947	)		(196,932	)		—			(210,028	)
Acquisition and capital expenditure		338			4,523			205,359			64,072			3,419,136			3,693,428
Disposal and termination		(1,352	)		(4,213	)		(76,457	)		(4,109	)		(1,362	)		(87,493	)
Depreciation		—			(134,350	)		(2,278,286	)		(89,940	)		—			(2,502,576	)
Impairment		—			(32	)		(41,450	)		(1,751	)		(27	)		(43,260	)
Transfer in (out)		126,066			270,980			2,742,671			16,218			(3,217,044	)		(61,109	)
Transfer to investment properties		(33,254	)		(8,081	)		—			—			—			(41,335	)
Transfer to assets held-for-sale		(89,330	)		(1,121	)		—			—			—			(90,451	)
Others		(21,474	)		26,822			79,345			1,596			(26,423	)		59,866
Ending, net	￦	1,262,181		￦	2,162,064		￦	9,093,251		￦	267,535		￦	1,000,268		￦	13,785,299
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)

1 With the application of IFRS 16, property and equipment were reclassified to right-of-use assets.

	2020
(In millions of Korean won)	Land			Buildings and structures			Machinery and equipment			Others			Construction- in-progress			Total
Acquisition cost	￦	1,262,313		￦	4,125,229		￦	37,654,635		￦	1,612,108		￦	1,001,171		￦	45,655,456
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(1,963,165	)		(28,561,384	)		(1,344,573	)		(903	)		(31,870,157	)
Beginning, net		1,262,181			2,162,064			9,093,251			267,535			1,000,268			13,785,299
Acquisition and capital expenditure		25,156			7,249			112,085			47,669			2,959,690			3,151,849
Disposal and termination		(1,756	)		(3,367	)		(69,401	)		(3,385	)		(1,027	)		(78,936	)
Depreciation		—			(135,646	)		(2,343,965	)		(91,164	)		—			(2,570,775	)
Impairment		—			(36	)		(35,271	)		(44,468	)		—			(79,775	)
Transfer in (out)		53,238			283,937			2,489,138			28,024			(2,899,197	)		(44,860	)
Transfer to investment properties		6,792			(8,848	)		—			—			—			(2,056	)
Changes in scope of consolidation		56			494			225			43			—			818
Others		(11,040	)		2,175			68,921			1,398			(16,899	)		44,555
Ending, net	￦	1,334,627		￦	2,308,022		￦	9,314,983		￦	205,652		￦	1,042,835		￦	14,206,119
Acquisition cost	￦	1,334,759		￦	4,402,691		￦	39,182,265		￦	1,619,822		￦	1,046,795	￦		47,586,332
Less: Accumulated depreciation (including accumulated impairment loss and others)		(132	)		(2,094,669	)		(29,867,282	)		(1,414,170	)		(3,960	)		(33,380,213	)

Summary of the Details of Property and Equipment Provided

Details of property and equipment provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	17,097	￦	18,705		Borrowings	￦	4,347	Industrial Bank of Korea, Korea Development Bank , K Bank, Inc.
Others	￦	45,851	￦	41,681		Borrowings	￦	3,473	Shinhan Bank

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related line item		Related amount		Secured party
Land and Buildings	￦	11,644	￦	15,502		Borrowings	￦	3,072	Industrial Bank of Korea, Korea Development Bank
	￦	4,142	￦	249		Deposits	￦	249	K Bank, Inc.

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Investment Properties (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Investment Properties

Changes in investment properties for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	350,417		￦	1,168,379		￦	121	￦	1,518,917
Less: Accumulated depreciation		(1,569	)		(426,264	)		—		(427,833	)
Beginning, net	￦	348,848		￦	742,115		￦	121	￦	1,091,084
Changes in accounting policy 1		—			46,666			—		46,666
Acquisition		148,511			103,774			1,781		254,066
Disposal and termination		(285	)		(1,408	)		—		(1,693	)
Depreciation		—			(65,178	)		—		(65,178	)
Transfer from property and equipment		33,254			8,081			—		41,335
Transfer and others		23,268			(2,118	)		—		21,150
Ending, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(491,586	)		—		(493,154	)

1 With the application of IFRS 16, right-of-use-assets were partially reclassified to investment properties.

(In millions of Korean won)	2020
	Land			Buildings			Construction- in-progress		Total
Acquisition cost	￦	555,164		￦	1,323,518		￦	1,902	￦	1,880,584
Less: Accumulated depreciation		(1,568	)		(491,586	)		—		(493,154	)
Beginning, net	￦	553,596		￦	831,932		￦	1,902	￦	1,387,430
Acquisition		11,723			7,096			34,243		53,062
Disposal and termination		(1,536	)		(243	)		—		(1,779	)
Depreciation		—			(64,531	)		—		(64,531	)
Transfer from property and equipment		(6,792	)		8,848			—		2,056
Transfer and others		(18,656	)		469			10,402		(7,785	)
Ending, net	￦	538,335		￦	783,571		￦	46,547	￦	1,368,453
Acquisition cost	￦	539,903		￦	1,341,326		￦	46,547	￦	1,927,776
Less: Accumulated depreciation (including accumulated impairment loss and others)		(1,568	)		(557,755	)		—		(559,323	)

Summary of Investment Properties Provided as Collateral

Details of investment properties provided as collateral as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	854,874	￦	62,896	Deposits	￦	56,831
Land and Buildings	￦	1,915	￦	3,044	Borrowings	￦	1,903

(In millions of Korean won)	December 31, 2020
	Carrying amount		Secured amount		Related account	Related amount
Land and Buildings	￦	790,414	￦	62,968	Deposits	￦	56,247
Land and Buildings	￦	2,861	￦	3,434	Borrowings	￦	2,928

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Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Intangible Assets

Changes in intangible assets for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others			Total
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	)		(739,769	)		(4,657,146	)
Beginning, net	￦	236,058		￦	335,110		￦	65,944		￦	2,156,500		￦	513,512		￦	3,407,124
Changes in accounting policy 1		—			—			—			—			(26,207	)		(26,207	)
Acquisition and capital expenditure		—			47,903			30,965			—			99,826			178,694
Disposal and termination		—			(3,019	)		(1,267	)		(284	)		(11,109	)		(15,679	)
Amortization		—			(115,839	)		(68,222	)		(399,382	)		(77,262	)		(660,705	)
Impairment		(605	)		(1,333	)		(1,807	)		(3,035	)		(55,118	)		(61,898	)
Others		117			9,812			11,768			142			(9,131	)		12,708
Ending, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)

1 With the application of IFRS 16, intangible assets were reclassified to right-of-use assets.

	2020
(In millions of Korean won)	Goodwill			Development costs			Software			Frequency usage rights			Others1			Total
Acquisition cost		541,596			1,661,372			978,139			3,622,327			1,193,048			7,996,482
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,026	)		(1,388,738	)		(840,758	)		(1,868,386	)		(758,537	)		(5,162,445	)
Beginning, net	￦	235,570		￦	272,634		￦	137,381		￦	1,753,941		￦	434,511		￦	2,834,037
Acquisition and capital expenditure		—			26,990			37,077			—			101,563			165,630
Disposal and termination		—			(1,849	)		(105	)		—			(11,866	)		(13,820	)
Amortization		—			(104,938	)		(54,191	)		(399,348	)		(69,677	)		(628,154	)
Impairment		—			—			(1,776	)		(193,194	)		(16,667	)		(211,637	)
Changes in scope of consolidation		—			575			77			—			3,690			4,342
Others		(5,485	)		87,587			27,537			(736	)		(98,043	)		10,860
Ending, net	￦	230,085		￦	280,999		￦	146,000		￦	1,160,663		￦	343,511		￦	2,161,258
Acquisition cost		536,093			1,767,422			1,053,980			3,373,095			1,167,735			7,898,325
Less: Accumulated amortization (including accumulated impairment loss and others)		(306,008	)		(1,486,423	)		(907,980	)		(2,212,432	)		(824,224	)		(5,737,067	)

1 The carrying amount of membership rights and others, excluding goodwill, with indefinite useful life not subject to amortization is ￦ 221,099 million (2019: ￦ 203,240 million) as at December 31, 2020.

Summary of Goodwill Allocated to Each Cash-Generation Unit

As at December 31, 2020, goodwill allocated to each cash-generating unit is as follows:

(In millions of Korean won)
Operating Segment	Cash generating Unit	Amount
ICT6	Mobile services1	￦	65,057
Finance	BC Card Co., Ltd.2		41,234
Others	GENIE Music Corporation (KT Music Corporation) 3		50,214
	PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) 4		42,745
	KT Telecop Co., Ltd. 5		15,418
	KT MOS Bukbu Co., Ltd and others		15,417
	Total	￦	230,085

1 The recoverable amounts of mobile services business are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% 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 7.43% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2018, 2019 and 2020.

2 The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.92% 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 7.75% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

3 The recoverable amount of GENIE Music Corporation (KT Music Corporation) is calculated based on fair value less cost to sell.

4 The recoverable amount of PlayD Co., Ltd. (N SEARCH MARKETING Co., Ltd.) is calculated based on fair value less cost to sell.

5 The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.30% 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 9.78% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

6 The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.22% ~ 4.93% 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 rate 7.43%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2018, 2019 and 2020.

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Investments in Associates and Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Details of Associates

Details of associates as at December 31, 2019 and 2020, are as follows:

	Percentage of ownership (%)						Location		Closing month
	2019			2020
Korea Information & Technology Fund		33.3	%		33.3	%		Korea		December 31, 2019, December 31, 2020
KT-IBKC Future Investment Fund 11		50.0	%		50.0	%		Korea		December 31, 2019, December 31, 2020
KT-CKP New Media Investment Fund		49.7	%		—			Korea		December 31, 2019, December 31, 2020
K Bank Inc.		10.0	%		34.0	%		Korea		December 31, 2019, December 31, 2020
Hyundai Robotics Co., Ltd.2		—			10.0	%		Korea		December 31, 2019, December 31, 2020

1 At the end of the reporting period, although the Group owns 50% ownership, the equity method of accounting has been applied as the Group, which is a limited partner of the investment fund, because the Group cannot participate in determining the operating and financial policies.

2 At the end of the reporting period, although the Group has less than 20% ownership in ordinary share, this entity is included in investments in associates as the Group has a significant influence in determining the operating and financial policies.

Summary of Changes in Investments in Associates and Joint Ventures

Changes in investments in associates and joint ventures for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	148,255	￦	—		￦	17,956		￦	(2,236	)	￦	163,975
KT-SB Venture Investment Fund		4,470		(4,470	)		—			—			—
KT-IBKC Future Investment Fund 1		9,961		3,750			389			—			14,100
KT-CKP New Media Investment Fund		281		(174	)		27			—			134
K Bank Inc.		52,655		21,782			(28,865	)		(414	)		45,158
Others1		56,785		(7,867	)		7,241			(11,866	)		44,293
	￦	272,407	￦	13,021		￦	(3,252	)	￦	(14,516	)	￦	267,660

	2020
(In millions of Korean won)	Beginning		Acquisition (Disposal)			Share of net profit from associates and joint ventures1			Others			Ending
Korea Information & Technology Fund	￦	163,975	￦	—		￦	12,205		￦	(6,025	)	￦	170,155
KT-IBKC Future Investment Fund 1		14,100		—			2,090			—			16,190
KT-CKP New Media Investment Fund		134		(134	)		—			—			—
K Bank Inc.		45,158		195,011			(30,209	)		(1,688	)		208,272
Hyundai Robotics Co., Ltd.		—		50,000			(64	)		1,000			50,936
Others1		44,293		28,400			34,298			5,337			112,328
	￦	267,660	￦	273,277		￦	18,320		￦	(1,376	)	￦	557,881

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 gain from associates and joint ventures of ￦ 279 million (2018: net loss of ￦ 445 million, 2019: net gain of ￦ 52 million) recognized as operating revenue during the period.

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, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	113,233	￦	378,691	￦	—	￦	—
KT-IBKC Future Investment Fund 1		28,200		—		—		—
KT-CKP New Media Investment Fund		3		267		—		—
K Bank Inc.		2,480,065		78,566		2,350,375		3,784

(In millions of Korean won)	December 31, 2020
	Current assets		Non-current assets		Current liabilities		Non-current liabilities
Korea Information & Technology Fund	￦	107,652	￦	402,812	￦	—	￦	—
KT-IBKC Future Investment Fund 1		32,379		—		—		—
K Bank Inc.		4,255,620		74,193		3,752,838		88,155
Hyundai Robotics Co., Ltd.		315,886		125,619		80,615		59,324

(In millions of Korean won)	2019
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	70,577	￦	53,867		￦	6,132		￦	59,999		￦	4,280
KT-IBKC Future Investment Fund 1		1,694		779			—			779			—
KT-CKP New Media Investment Fund		56		55			—			55			—
K Bank Inc.		92,720		(100,773	)		(23	)		(100,796	)		—

(In millions of Korean won)	2020
	Operating revenue		Profit (loss) for the year			Other comprehensive income(loss)			Total comprehensive income(loss)			Dividends received from associates
Korea Information & Technology Fund	￦	54,473	￦	36,615		￦	9,647		￦	46,262		￦	9,241
KT-IBKC Future Investment Fund 1		6,551		4,179			—			4,179			—
K Bank Inc.		80,301		(105,374	)		(1,126	)		(106,500	)		—
Hyundai Robotics Co., Ltd.		195,311		(642	)		11,573			10,931			—

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	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	￦	491,924		33.30	%	￦	163,975	￦	—	￦	163,975
KT-IBKC Future Investment Fund 1		28,200		50.00	%		14,100		—		14,100
KT-CKP New Media Investment Fund		270		49.70	%		134		—		134
K Bank Inc.1		204,472		10.00	%		45,158		—		45,158

1 12.1% of non-voting convertible stock are excluded from percentage of ownership for K Bank Inc.

(In millions of Korean won)	December 31, 2020
	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	￦	510,464		33.30	%	￦	170,155	￦	—	￦	170,155
KT-IBKC Future Investment Fund 1		32,379		50.00	%		16,190		—		16,190
K Bank Inc.1		488,819		34.00	%		166,198		42,074		208,272
Hyundai Robotics Co., Ltd.		301,566		10.00	%		30,157		20,779		50,936

1 12.1% 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, 2020

Text block [abstract]

Summary of Trade and Other Payables

Details of trade and other payables as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Current liabilities
Trade payables	￦	1,304,795	￦	1,239,717
Other payables		6,292,683		4,970,382
Total	￦	7,597,478	￦	6,210,099
Non-current liabilities
Trade payables	￦	1,733	￦	1,528
Other payables		1,080,487		806,012
Total	￦	1,082,220	￦	807,540

Summary of Other Payables

Details of other payables as at December 31, 2019 and 2020 are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Non-trade payables1	￦	5,275,224		￦	3,841,227
Accrued expenses		987,624			933,978
Operating deposits		910,045			803,904
Others		200,277			197,285
Less: non-current		(1,080,487	)		(806,012	)
Current	￦	6,292,683		￦	4,970,382

1 Settlement payables of BC Card Co., Ltd., a subsidiary of the Group, of ￦ 1,007,171 million related to credit card transactions are included as at December 31, 2020 (2019: ￦ 1,824,068 million).

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Borrowings (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Borrowings

Debentures

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019					December 31, 2020
Type	Maturity		Annual interest rates	Foreign currency		Korean won			Foreign currency		Korean won
MTNP notes1		Sept. 7, 2034	6.50%		USD 100,000	￦	115,780			USD 100,000	￦	108,800
MTNP notes		July 18, 2026	2.50%		USD 400,000		463,120			USD 400,000		435,200
MTNP notes		Aug. 7, 2022	2.63%		USD 400,000		463,120			USD 400,000		435,200
FR notes		Aug. 20, 2020	—		USD 200,000		231,560			—		—
FR notes2		Aug. 20, 2023	LIBOR(3M)+0.900%		USD 100,000		115,780			USD 100,000		108,800
MTNP notes		July 6, 2020	—		JPY 4,000,000		42,539			—		—
MTNP notes		July 6, 2021	0.38%		JPY 16,000,000		170,155			JPY 16,000,000		168,682
MTNP notes		Nov. 13, 2020	—		JPY 30,000,000		319,041			—		—
MTNP notes		July 19, 2022	0.22%		JPY 29,600,000		314,787			JPY 29,600,000		312,061
MTNP notes		July 19, 2024	0.33%		JPY 400,000		4,254			JPY 400,000		4,217
FR notes2		Nov. 1, 2024	LIBOR(3M)+0.980%		USD 350,000		405,230			USD 350,000		380,800
FR notes2		June 19, 2023	SOR(6M)+0.500%		—		—			SGD 284,000		233,510
MTNP notes		Sept. 1, 2025	1.00%		—		—			USD 400,000		435,200
The 180-2rd Public bond		Apr. 26, 2021	4.71%		—		380,000			—		380,000
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 184-2nd 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 185-2nd Public bond		Sept. 16, 2020	—		—		300,000			—		—
The 186-3rd Public bond		June 26, 2024	3.42%		—		110,000			—		110,000
The 186-4th Public bond		June 26, 2024	3.70%		—		100,000			—		100,000
The 187-3rd Public bond		Sept. 2, 2024	3.31%		—		170,000			—		170,000
The 187-4th Public bond		Sept. 2, 2034	3.55%		—		100,000			—		100,000
The 188-1st Public bond		Jan. 29, 2020	—		—		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 189-2nd 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			—		110,000
The 190-2nd Public bond		Jan. 30, 2023	2.75%		—		150,000			—		150,000
The 190-3rd Public bond		Jan. 30, 2028	2.95%		—		170,000			—		170,000
The 190-4th Public bond		Jan. 30, 2038	2.93%		—		70,000			—		70,000
The 191-1st Public bond		Jan. 14, 2022	2.05%		—		220,000			—		220,000
The 191-2nd Public bond		Jan. 15, 2024	2.09%		—		80,000			—		80,000
The 191-3rd Public bond		Jan. 15, 2029	2.16%		—		110,000			—		110,000
The 191-4th Public bond		Jan. 14, 2039	2.21%		—		90,000			—		90,000
The 192-1st Public bond		Oct. 11, 2022	1.55%		—		340,000			—		340,000
The 192-2nd Public bond		Oct. 11, 2024	1.58%		—		100,000			—		100,000
The 192-3rd Public bond		Oct. 11, 2029	1.62%		—		50,000			—		50,000
The 192-4th Public bond		Oct. 11, 2039	1.67%		—		110,000			—		110,000
The 193-1st Public bond		June 16, 2023	1.17%		—		—			—		150,000
The 193-2nd Public bond		June 17, 2025	1.43%		—		—			—		70,000
The 193-3rd Public bond		June 17, 2030	1.61%		—		—			—		20,000
The 193-4th Public bond		June 15, 2040	1.71%		—		—			—		60,000
The 148th Won-denominated unsecured bond		June 23, 2023	1.51%		—		—			—		100,000
Subtotal							7,045,366					6,962,470
Less: Current portion							(1,052,032	)				(1,228,283	)
Discount on bonds							(20,780	)				(19,847	)
Total						￦	5,972,554				￦	5,714,340

1 As at December 31, 2020, 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) and SOR (6M) are approximately 0.238% and 0.185%, respectively as at December 31, 2020.

Summary of Korean Won and Foreign Currency Borrowings

Convertible bonds

(In millions of Korean won and thousands of foreign currencies)

December 31, 2019

Type

Issuance date

Maturity

Annual interest rate

December 31, 2019

December 31, 2020

The 1st CB(Private)1,2

Jun. 5, 2020

Jun. 5, 2025

0.00

%

￦

—

￦

8,000

Redemption premium

—

2,267

Bond discount issuance

—

(4,644

)

Subtotal

￦

—

￦

5,623

Current portion

￦

—

￦

—

Total

￦

—

￦

5,623

1 Common shares of Storywiz are subject to conversion (appraisal period: June 5, 2021~ May 4, 2025).

2 Nominal interest rate and maturity yield is approximately 0% and 5% and will be settled on maturity

Summary of Short-term Borrowings

Short-term borrowings

(In millions of Korean won)			December 31, 2019		December 31, 2020
Type	Financial institution	Annual interest rates
Operational	NongHyup Bank	1.740% ~ 2.360%	￦	15,000	￦	40,189
	Shinhan Bank	2.460% ~ 2.960%		57,500		22,500
	Shinhan Bank	CD91+1.431%		—		10,000
	Woori Bank	3.57%		—		1,900
	Korea Development Bank	3.34%		10,000		10,000
	SooHyup Bank	—		1,000		—
	Industrial Bank of Korea	1.74%		—		200
	Hana Bank	4.20%		—		11,000
	Total		￦	83,500	￦	95,789

Summary of Long-term Borrowings

Long-term borrowings

(In millions of Korean won and thousands of foreign currencies)				December 31, 2019				December 31, 2020
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%		—	￦	3,454		—	￦	2,961
Industrial Bank of Korea	General loans		2.98%		—		6,000		—		6,000
Shinhan Bank	General loans		1.94%		—		5,000		—		5,000
	Facility loans2		LIBOR(3M)+1.340%		USD 25,918		30,008		USD 25,918		28,199
	General loans2		LIBOR(3M)+1.650%		USD 3,000		3,473		USD 8,910		9,694
	General loans2		LIBOR(3M)+2.130%		—		—		USD 25,000		27,200
CA-CIB	Long-term CP		1.26%		—		—		—		100,000
NongHyup Bank	Facility loans		2.00%		—		79		—		54
Korea Development Bank	General loans		3.02%		—		10,000		—		10,000
	General loans		3.31%		—		30,000		—		30,000
Others	Kookmin Bank and other2		LIBOR(3M)+1.850%		USD 87,940		101,816		USD 48,855		53,155
			—		—		950		—		—
Subtotal						￦	190,780			￦	272,263
Less: Current portion						￦	(50,192)			￦	(94,042)
Total						￦	140,588			￦	178,221

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 0.238% as at December 31, 2020.

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, 2020 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, 2021 ~ Dec 31, 2021	￦	1,060,000	￦	168,682	￦	1,228,682	￦	147,307	￦	42,524	￦	189,831	￦	1,418,513
Jan 1, 2022 ~ Dec 31, 2022		560,000		747,261		1,307,261		518		38,830		39,348		1,346,609
Jan 1, 2023 ~ Dec 31, 2023		590,000		342,310		932,310		100,500		36,894		137,394		1,069,704
Jan 1, 2024 ~ Dec 31, 2024		460,000		385,017		845,017		493		—		493		845,510
After Jan. 1, 2025		1,678,000		979,200		2,657,200		986		—		986		2,658,186
	￦	4,348,000	￦	2,622,470	￦	6,970,470	￦	249,804	￦	118,248	￦	368,052	￦	7,338,522

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Provisions (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Changes in Provisions

Changes in provisions for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	58,760		￦	118,828		￦	104,288		￦	281,876
Increase (Transfer)		42,684			6,591			17,328			66,603
Usage		(35,640	)		(5,394	)		(15,851	)		(56,885	)
Reversal		(1,563	)		(6,736	)		(29,133	)		(37,432	)
Ending balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Current	￦	64,241		￦	37,906		￦	73,465		￦	175,612
Non-current		—			75,383			3,167			78,550
	2020
(In millions of Korean won)	Litigation			Restoration cost			Others			Total
Beginning balance	￦	64,241		￦	113,289		￦	76,632		￦	254,162
Increase (Transfer)		17,064			(1,933	)		17,873			33,004
Usage		(3,948	)		(2,990	)		(2,266	)		(9,204	)
Reversal		(857	)		(3,023	)		(23,212	)		(27,092	)
Changes in scope of consolidation		—			424			898			1,322
Ending balance	￦	76,500		￦	105,767		￦	69,925		￦	252,192
Current	￦	76,500		￦	22,343		￦	67,147		￦	165,990
Non-current		—			83,424			2,778			86,202

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Net Defined Benefit Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Statement [LineItems]

Summary of Amount Recognized in the Statements of Financial Position and Defined Benefit Obligations

The amounts recognized in the statements of financial position are determined as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Present value of defined benefit obligations	￦	2,427,351		￦	2,556,712
Fair value of plan assets		(2,069,710	)		(2,189,375	)
Liabilities	￦	365,663		￦	378,087
Assets in the statement of financial position	￦	8,022		￦	10,750

Summary of Changes in the Defined Benefit Obligations

Changes in the defined benefit obligations for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	2,201,876		￦	2,427,351
Current service cost		243,598			248,047
Interest expense		47,403			45,083
Benefit paid		(100,663	)		(258,866	)
Changes due to settlements of plan		910			1,075
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions		39			5,191
Actuarial gains and losses arising from changes in financial assumptions		11,773			17,077
Actuarial gains and losses arising from experience adjustments		19,465			57,703
Changes in scope of consolidation		2,950			14,051
Ending	￦	2,427,351		￦	2,556,712

Changes in the fair value of plan assets for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	1,643,046		￦	2,069,710
Interest income		35,386			38,590
Remeasurements:
Return on plan assets (excluding amounts included in interest income)		(2,537	)		2,589
Benefits paid		(87,119	)		(213,953	)
Employer contributions		476,916			284,243
Changes in scope of consolidation		4,018			8,196
Ending	￦	2,069,710		￦	2,189,375

Summary of Amounts Recognized in the Operating expenses of the Consolidated Statements of Operations

Amounts recognized in the ‘Operating expenses’ of the consolidated statements of operations for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Current service cost	￦	225,667		￦	243,598		￦	248,047
Net Interest cost		10,458			12,017			6,494
Past service cost		9,801			910			1,075
Transfer out		(13,881	)		(16,215	)		(16,514	)
Total expenses	￦	232,045		￦	240,310		￦	239,102

Summary of Principal Actuarial Assumptions

Principal actuarial assumptions used are as follows:

	December 31, 2018			December 31, 2019			December 31, 2020
Discount rate		2.32	%		1.97	%		1.93	%
Future salary increase		5.08	%		4.92	%		4.88	%

Summary of Expected Maturity Analysis of Undiscounted Pension Benefits

The expected maturity analysis of undiscounted pension benefits as at December 31, 2020, 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	￦	232,550	￦	271,366	￦	794,840	￦	2,284,517	￦	3,583,273

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, 2020, 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		￦ (86,288)	￦	93,254
Salary growth rate	0.5% point		85,344		(79,970	)

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary Of Major Commitments With Local Financial Institutions

As at December 31, 2020, 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		1,502,000		—
Inter-Korean Cooperation Fund	Export-Import Bank of Korea	KRW		37,700		2,714
Insurance for Economic Cooperation project	Export-Import Bank of Korea	KRW		3,240		1,732
Collateralized loan on electronic accounts receivable-trade	Kookmin Bank and others	KRW		522,849		23,475
Plus electronic notes payable	Industrial Bank of Korea	KRW		50,000		331
Loans for working capital	Korea Development Bank and others	KRW		243,593		152,243
Facility loans	Shinhan Bank and others	KRW		100,123		55
	Kookmin Bank and others	USD		212,000		48,855
Derivatives transaction limit	Korea Development Bank	KRW		100,000		22,027
	Woori Bank and others	USD		69,054		44,616
Total		KRW		2,559,505		202,577
		USD		281,054		93,471

Summary of Guarantees Received from Financial Institutions

As at December 31, 2020, 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		208,386
Performance guarantee	Korea Development Bank and others		USD		8,569
Guarantee for import letters of credit	Industrial Bank of Korea and others		USD		5,000
Guarantee for payment in won currency	Shinhan Bank and others		KRW		70,962
Refund guarantee for advances received	Korea Development Bank		USD		8,536
Guarantee for payment in foreign currency	KEB Hana Bank and others		USD		40,840
Comprehensive credit line	KEB Hana Bank and others		KRW		41,100
Comprehensive credit line	KEB Hana Bank and others		USD		8,700
Bid guarantee	KEB Hana Bank		USD		400
Bid guarantee	Korea Software Financial Cooperative and others		KRW		80,246
Performance guarantee /warranty guarantee			KRW		393,019
Guarantee for advance payments/others			KRW		388,656
Warranty guarantee	Seoul Guarantee Insurance		KRW		1,305
Performance guarantee			KRW		9,690
Guarantees for licensing			KRW		7,748
Guarantees for depositions			KRW		3,792
Merchant business guarantee insurance			KRW		237
Total			KRW		1,205,141
			USD		72,045

Summary Of Guarantees Provided By The Group For Third Parties

As at December 31, 2020, guarantees provided by the Group to a third party, are as follows:

(In millions of Korean won)	Subject to payment guarantees	Creditor	Limit		Used amount		Period
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Gasan Solar Power Plant Inc.	Shinhan Bank		4,700		1,371		Jan. 08, 2025
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	SPP Inc.	Suhyup Bank		3,250		932		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Korea Cell Inc.	Suhyup Bank		3,250		880		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	San-Ya Agricultural Association Corporation	Suhyup Bank		3,250		888		Feb. 16, 2024
KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)1	Ciocanesti Korea Co., Ltd.	NH Investment & Securities Co.,Ltd.		7,600		7,600		Jun. 8, 2017
KT Hitel Co., Ltd.	Shinhan Bank	Cash payers		700		—		Apr. 17, 2020 ~ Apr. 16, 2021
Nasmedia Co., Ltd.	Stockholders Association Members	Korea Securities Finance Corp		5,654		2,735		—

1 According to the above payment guarantee, KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.), a subsidiary of the Group, will have an obligation of repayment if the principal borrower does not repay the borrowing.

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Leases (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of balance sheet information about leases for lessee

The consolidated statement of financial position shows the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Right-of-use assets
Property and building	￦	1,020,619	￦	1,073,207
Machinery and track facilities		140,296		42,127
Others		107,414		101,845
Total	￦	1,268,329	￦	1,217,179
Investment property (buildings)		50,010		19,456
(In millions of Korean won)	December 31, 2019		December 31, 2020
Lease liabilities1
Current	￦	392,433	￦	345,224
Non-Current		818,919		798,416
Total	￦	1,211,352	￦	1,143,640

1 Included in the line items ‘Other current liabilities and other non-current liabilities’ in the consolidated statement of financial position (Notes 9 and 41).

Summary of statement of profit or loss information about leases for lessee

The consolidated statements of profit or loss show the following amounts relating to leases:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Depreciation of Right-of-use assets
Property and building	￦	300,773	￦	290,168
Machinery and track facilities		89,452		58,419
Others		52,402		55,588
Total	￦	442,627	￦	404,175
Depreciation of Investment Properties	￦	21,809	￦	19,113
Interest expense relating to lease liabilities		55,001		44,091
Expense relating to short-term leases		14,718		10,998
Expense relating to leases of low-value assets that are not short-term leases		26,575		25,894
Expense relating to variable lease payments not included in lease liabilities		5,993		8,096

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Share Capital (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Share Capital

As at December 31, 2019 and 2020, the Group’s number of authorized shares is one billion.

December 31, 2019

December 31, 2020

Number of issued shares

Par value per share (Korean won)

Ordinary Shares (in millions of Korean won)

Number of issued 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, 2020

Text block [abstract]

Summary of Retained Earnings

Details of retained earnings as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Legal reserve1	￦	782,249	￦	782,249
Voluntary reserves2		4,651,362		4,651,362
Unappropriated retained earnings		6,157,305		6,721,809
Total	￦	11,590,916	￦	12,155,420

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, 2020

Text block [abstract]

Summary of Accumulated Other Comprehensive Income

As at December 31, 2019 and 2020, the details of the Controlling Company’s accumulated other comprehensive income are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Changes in investments in associates and joint ventures	￦	1,556		￦	16,257
Loss on derivatives valuation		(7,624	)		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			61,438
Exchange differences on translation for foreign operations		(10,571	)		(11,453	)
Total	￦	194,934		￦	86,051

Summary of Changes in Accumulated Other Comprehensive Income

Changes in accumulated other comprehensive income for the years ended December 31, 2019 and 2020, are as follows:

	2019
(In millions of Korean won)	Beginning			Increase/ decrease		Reclassification to gain or loss			Ending
Changes in investments in associates and joint ventures	￦	(871	)	￦	2,427	￦	—		￦	1,556
Gain or loss on derivatives valuation		(30,474	)		67,534		(44,684	)		(7,624	)
Gain on valuation of financial assets at fair value through other comprehensive income		96,704			114,869		—			211,573
Exchange differences on translation for foreign operations		(15,201	)		4,630		—			(10,571	)
Total	￦	50,158		￦	189,460	￦	(44,684	)	￦	194,934

(In millions of Korean won)	2020
	Beginning			Increase/ decrease			Reclassification to gain or loss		Ending
Changes in investments in associates and joint ventures	￦	1,556		￦	14,701		￦	—	￦	16,257
Gain or loss on derivatives valuation		(7,624	)		(83,998	)		111,431		19,809
Gain on valuation of financial assets at fair value through other comprehensive income		211,573			(150,135	)		—		61,438
Exchange differences on translation for foreign operations		(10,571	)		(882	)		—		(11,453	)
Total	￦	194,934			￦(220,314	)	￦	111,431	￦	86,051

Summary of Other Components of Equity

The Group’s other components of equity as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Treasury stock1		￦(825,838)			￦(882,224)
Gain or loss on disposal of treasury stock2		1,229			(17,579	)
Share-based payments		7,769			5,901
Others3		(353,243	)		(340,882	)
Total		￦(1,170,083	)		￦(1,234,784	)

1 During the year ended December 31, 2020, the Group acquired 4,550,000 treasury shares and granted 1,150,580 treasury shares as share-based payment.

2 The amount directly reflected in equity is ￦7,288 million (2019: ￦603 million) for the year ended December 31, 2020. 

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, 2019 and 2020, the details of treasury stock are as follows:

	December 31, 2019		December 31, 2020
Number of shares (in shares)		15,870,258		19,269,678
Amounts (In millions of Korean won)	￦	825,838	￦	882,224

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Share-based Payments (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Details of Share-Based Payments

Details of share-based payments as at December 31, 2020, are as follows:

(In share)	14th grant
Grant date	June 16, 2020
Grantee	CEOs, internal directors, external directors, executives
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option (in Korean won)	￦22,700
Total compensation costs (in Korean won)	￦ 5,187 million
Estimated exercise date (exercise date)	During 2021
Valuation method	Fair value method

(In share)	Employee wage negotiation
Grant date	September 21, 2020
Grantee	All employees
Vesting conditions	Current employees as of September 21, 2020
Fair value per option (in Korean won)	￦22,950
Total compensation costs (in Korean won)	￦ 23,317 million
Estimated exercise date (exercise date)	December 22, 2020
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, 2019 and 2020, are as follows:

	2019
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
12th grant		353,325		—		256,543		96,782		—		—
13th grant		—		372,023		—		—		372,023		—
Total		353,325		372,023		256,543		96,782		372,023		—

	2020
	Beginning		Grant		Expired		Exercised1		Ending		Number of shares exercisable
13th grant		372,023		—		241,548		130,475		—		—
14th grant		—		398,856		—		—		398,856		—
Employee wage negotiation		—		1,020,105		—		1,020,105		—		—
Total		372,023		1,418,961		241,548		1,150,580		398,856		—

1  The weighted average price of ordinary shares at the time of exercise in 2020 was ￦ 25,486 (2019: ￦ 27,482).

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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Detail Explanation of Revenue in the consolidated Statement of operations

The Group has recognized the following amounts relating to revenue in the Consolidated Statements of Operations:

(In millions of Korean won)	2018		2019		2020
Revenue from contracts with customers	￦	23,012,257	￦	24,441,122	￦	23,895,631
Revenue from other sources		423,793		458,067		545,016
Total revenue	￦	23,436,050	￦	24,899,189	￦	24,440,647

Detail Explanation of Operating Revenue

Operating revenues for the years ended December 31, 2018, 2019 and 2020 are as follows:

(In millions of Korean won)	2018		2019		2020
Mobile services	￦	6,827,685	￦	6,795,124	￦	6,805,218
Fixed-line services		4,869,253		4,866,698		4,827,015
Fixed-line and VoIP telephone services		1,708,319		1,578,546		1,463,553
Broadband Internet access services		2,112,763		2,177,447		2,256,188
Data communication services		1,048,171		1,110,705		1,107,274
Media and content		2,261,808		2,516,256		2,637,691
Financial services		3,444,917		3,641,655		3,493,920
Sale of goods		3,288,911		4,194,168		3,593,127
Others		2,743,476		2,885,288		3,083,676
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647

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)	December 31, 2019		December 31, 2020
Contract assets1	￦	655,329	￦	672,672
Contract liabilities1		413,442		413,707
Deferred revenue2	￦	92,557	￦	89,694

1 The Group recognized contract assets of ￦ 86,234 million and contract liabilities of ￦29,574 million for long term construction contracts as at December 31, 2020 (2019: contract assets of ￦98,288 million and contract liabilities of ￦47,832 million). The Group recognizes contract assets as trade and other receivables, and contract liabilities as other current liabilities.

2 Deferred revenue recognized relating to government grant is excluded.

Detail Analysis of Contract Costs Recognized as Assets

The contract costs recognized as assets are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Incremental cost of contract establishment	￦	1,764,009	￦	1,726,191
Cost of Contract performance		85,234		78,757

Detail of Revenue Arising from Carried-Forward Contract Liabilities

The recognized revenue arising from carried-forward contract liabilities from prior year is as follows:

(In millions of Korean won)	2018		2019		2020
Revenue recognized that was included in the contract liability balance at the beginning of the year
Allocation of the transaction price	￦	183,905	￦	266,478	￦	251,975
Deferred revenue of joining/installment fee		39,975		44,032		42,685
Others		1,536		—		—
Total	￦	225,416	￦	310,510	￦	294,660

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Operating Expenses (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Operating Expenses

Operating expenses for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019		2020
Salaries and wages	￦	3,845,842		￦	3,974,233	￦	4,123,680
Depreciation		2,674,205			2,530,252		2,605,128
Depreciation of right-of-use assets		—			442,629		404,175
Amortization of intangible assets		607,527			656,611		624,982
Commissions		1,080,168			1,115,477		965,461
Interconnection charges		579,613			534,025		500,081
International interconnection fee		226,627			240,254		172,529
Purchase of inventories		4,414,094			4,453,820		3,681,801
Changes of inventories		(432,607	)		282,957		257,041
Sales commission		1,942,841			2,315,731		2,337,127
Service cost		1,540,869			1,610,261		2,102,875
Utilities		323,411			332,816		360,797
Taxes and dues		285,131			277,742		283,197
Rent		460,377			193,357		136,355
Insurance premium		73,654			82,404		71,018
Installation fee		143,669			155,178		132,117
Advertising expenses		157,675			150,166		132,466
Research and development expenses		176,758			165,028		156,940
Card service cost		3,112,618			3,066,766		2,941,669
Others		1,122,718			1,292,512		1,428,875
Total	￦	22,335,190		￦	23,872,219	￦	23,418,314

Summary of Details of Salaries and Wages

Details of salaries and wages for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Short-term employee benefits	￦	3,505,214	￦	3,663,337	￦	3,770,786
Post-employment benefits(Defined benefit plan)		232,045		240,310		239,102
Post-employment benefits(Defined contribution plan)		48,210		57,170		61,912
Share-based payment		8,439		6,398		28,604
Others		51,934		7,018		23,276
Total	￦	3,845,842	￦	3,974,233	￦	4,123,680

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Financial Income and Costs (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Details of Financial Income

Details of financial income for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest income	￦	244,796	￦	282,704	￦	270,571
Gain on foreign currency transactions		17,175		24,596		17,493
Gain on foreign currency translation		3,691		17,979		164,351
Gain on settlement of derivatives		27,950		9,016		9,397
Gain on valuation of derivatives		66,305		77,353		172
Others		14,326		12,747		36,630
Total	￦	374,243	￦	424,395	￦	498,614

Summary of Details of Financial Costs

Details of financial costs for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018		2019		2020
Interest expenses	￦	296,874	￦	278,427	￦	263,579
Loss on foreign currency transactions		49,156		30,267		27,805
Loss on foreign currency translation		72,642		93,977		26,340
Loss on settlement of derivatives		—		20		1,406
Loss on valuation of derivatives		2,045		15,867		163,763
Loss on disposal of trade receivables		13,818		11,298		8,152
Others		1,124		2,277		16,338
Total	￦	435,659	￦	432,133	￦	507,383

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Deferred Income Tax and income Tax Expense (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, is as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Deferred tax assets
Deferred tax assets to be recovered within 12 months	￦	419,889		￦	404,434
Deferred tax assets to be recovered after more than 12 months		1,613,836			1,631,759
Deferred tax assets before offsetting		2,033,725			2,036,193
Deferred tax liabilities
Deferred tax liability to be recovered within 12 months		(538,578	)		(637,317	)
Deferred tax liability to be recovered after more than 12 months		(1,495,759	)		(1,394,509	)
Deferred tax liabilities before offsetting		(2,034,337	)		(2,031,826	)
Deferred tax assets after offsetting	￦	424,856		￦	433,698
Deferred tax liabilities after offsetting	￦	425,468		￦	429,331

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, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2019			2020
Beginning	￦	260,584		￦	(612	)
Changes to the statement of operations		(199,527	)		(72,124	)
Changes to other comprehensive loss (income)		(61,669	)		77,103
Ending	￦	(612	)	￦	4,367

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)	2019
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		—			(10,250	)		(648	)		(10,898	)
Investment in subsidiaries, associates, and joint ventures		(93,604	)		(14,622	)		35			(108,191	)
Depreciation		(424	)		(11,182	)		—			(11,606	)
Advanced depreciation provision		(313,184	)		63			—			(313,121	)
Deposits for severance benefits		(398,982	)		(99,126	)		1,255			(496,853	)
Accrued income		(1,558	)		17			—			(1,541	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(369,916	)		(40,947	)		—			(410,863	)
Contract assets		(11,505	)		(42,245	)		—			(53,750	)
Financial assets at fair value through profit or loss		(661	)		338			—			(323	)
Financial assets at fair value through other comprehensive income		(41,798	)		(3,556	)		(58,483	)		(103,837	)
Others		(284,255	)		(238,725	)		(170	)		(523,150	)
Total		(1,516,091	)		(460,235	)		(58,011	)		(2,034,337	)
Deferred tax assets
Derivative instruments		8,341			(850	)		(7,491	)		—
Provision for impairment or trade receivables		99,887			(15,816	)		—			84,071
Inventory valuation		121			(98	)		—			23
Contribution for construction		16,800			(646	)		—			16,154
Unsettled expenses		127,897			32,539			—			160,436
Provisions		36,178			(3,354	)		—			32,824
Property and equipment		230,278			(1,623	)		—			228,655
Defined benefit liabilities		513,842			48,847			6,782			569,471
Withholding of facilities expenses		6,609			(426	)		—			6,183
Deduction of installment receivables		42			6			—			48
Assets retirement obligation		24,532			4,484			—			29,016
Gain or loss foreign currency translation		10,672			10,005			—			20,677
Deferred revenue		39,641			(3,841	)		—			35,800
Real-estate sales		21,728			(8,043	)		—			13,685
Others		537,209			174,177			(2,949	)		708,437
Total		1,673,777			235,361			(3,658	)		1,905,480
Temporary difference, net		157,686			(224,874	)		(61,669	)		(128,857	)
Tax credit carryforwards		102,898			25,347			—			128,245
Total net balance		260,584			(199,527	)		(61,669	)		(612	)

(In millions of Korean won)	2020
	Beginning			Consolidated statements of operations			Other comprehensive income			Ending
Deferred tax liabilities
Derivative instruments		(10,898	)		10,055			—			(843	)
Investment in subsidiaries, associates, and joint ventures		(108,191	)		(64,553	)		(8,820	)		(181,564	)
Depreciation		(11,606	)		7,431			—			(4,175	)
Advanced depreciation provision		(313,121	)		1,203			—			(311,918	)
Deposits for severance benefits		(496,853	)		(26,419	)		2,015			(521,257	)
Accrued income		(1,541	)		(212	)		—			(1,753	)
Reserve for technology and human resource development		(204	)		—			—			(204	)
Contract cost		(410,863	)		67,898			—			(342,965	)
Contract assets		(53,750	)		(112,794	)		—			(166,544	)
Financial assets at fair value through profit or loss		(323	)		(304	)		—			(627	)
Financial assets at fair value through other comprehensive income		(103,837	)		(4,420	)		77,634			(30,623	)
Others		(523,150	)		53,797			—			(469,353	)
Total		(2,034,337	)		(68,318	)		70,829			(2,031,826	)
Deferred tax assets
Derivative instruments		—			40,342			(9,860	)		30,482
Provision for impairment or trade receivables		84,071			4,994			—			89,065
Inventory valuation		23			(259	)		—			(236	)
Contribution for construction		16,154			246			—			16,400
Unsettled expenses		160,436			(24,358	)		—			136,078
Provisions		32,824			1,198			—			34,022
Property and equipment		228,655			(1,695	)		—			226,960
Defined benefit liabilities		569,471			13,707			15,186			598,364
Withholding of facilities expenses		6,183			(436	)		—			5,747
Deduction of installment receivables		48			(20	)		—			28
Assets retirement obligation		29,016			(883	)		—			28,133
Gain or loss foreign currency translation		20,677			(20,539	)		—			138
Deferred revenue		35,800			7,230			—			43,030
Contract assets		—			97,464			—			97,464
Real-estate sales		13,685			(13,685	)		—			—
Others		708,437			(123,798	)		948			585,587
Total		1,905,480			(20,492	)		6,274			1,891,262
Temporary difference, net		(128,857	)		(88,810	)		77,103			(140,564	)
Tax credit carryforwards		128,245			16,686			—			144,931
Total net balance		(612	)		(72,124	)		77,103			4,367

Summary of Tax Impacts Recognized Directly To Equity

The tax impacts recognized directly to equity as at December 31, 2018, 2019, and 2020, are as follows:

	2018									2019									2020
(In millions of Korean won)	Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition			Before recognition			Tax effect			After recognition
Gain on valuation of financial assets at fair value through other comprehensive income		59,384			(15,573	)		43,811			225,635			(58,483	)		167,152			54,969			(12,972	)		41,997
Gain (loss) on valuation of hedge instruments		(36,756	)		9,745			(27,011	)		31,003			(8,139	)		22,864			37,247			(9,860	)		27,387
Remeasurements of net defined benefit liabilities		(116,324	)		42,813			(73,511	)		(33,814	)		8,037			(25,777	)		(77,382	)		17,201			(60,181	)
Share of gain(loss) of associates and joint ventures, and others		(1,036	)		179			(857	)		4,493			(1,327	)		3,166			25,538			(8,820	)		16,718
Exchange differences on translation for foreign operations		3,989			(1,049	)		2,940			6,692			(1,759	)		4,933			(3,614	)		948			(2,666	)
Total	￦	(90,743	)	￦	36,115		￦	(54,628	)	￦	234,009		￦	(61,671	)	￦	172,338		￦	36,758		￦	(13,503	)	￦	23,255

Summary of Details of Income Tax Expense

Details of income tax expense for the years ended December 31, 2018, 2019 and 2020, are calculated as follows:

(In millions of Korean won)	2018			2019		2020
Current income tax expense	￦	329,581		￦	120,533	￦	213,225
Impact of change in deferred taxes		(15,016	)		199,527		72,124
Income tax expense	￦	314,565		￦	320,060	￦	285,349

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)	2018			2019			2020
Profit before income tax expense	￦	1,033,977		￦	1,015,928		￦	1,031,605
Statutory income tax expense	￦	273,982		￦	269,018		￦	273,329
Tax effect
Income not taxable for taxation purposes		(85,322	)		(1,265	)		(24,657	)
Non-deductible expenses		18,126			19,543			31,741
Tax credit		(20,319	)		(39,190	)		(47,056	)
Additional payment of income taxes		11,439			3,832			429
Tax effect and adjustment on consolidation
Goodwill impairment		137			159			—
Eliminated dividend income form subsidiaries		31,966			21,917			20,682
Changes of out-side tax effect		618			13,539			38,552
Investment in-kind		82,820			—			—
Intangible Asset impairment and amortization		—			14,052			3,790
Reversal expenses of contract cost assets		—			11,213			(6,643	)
Others		1,118			7,242			(4,818	)
Income tax expense	￦	314,565		￦	320,060		￦	285,349

Summary of deferred tax assets and liabilities that are not recognized

Details of deferred tax assets and liabilities that are not recognized as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019		2020
Deductible temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	610,351	￦	583,890
Unused tax loss		31,257		28,115
Unused Tax credit		—		2,654
Others		32,494		64,760
Total	￦	674,102	￦	679,419
Taxable temporary differences
Investment in subsidiaries, associates, and joint ventures	￦	141,664	￦	132,848
Others		10,372		9,568
Total	￦	152,036	￦	142,416

Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets

The expected period of expiry for unused tax losses not recognized in deferred tax assets as at December 31, 2019 and 2020, is as follows:

(In millions of Korean won)	2019		2020
2021	￦	18,582	￦	2,140
2022		2,140		80,649
2023		80,649		5,848
2024		5,848		4,867
2025		4,867		2,847
2026		9,390		9,709
2027		7,888		8,389
2028		10,064		8,426
2029		2,030		2,579
2030		617		2,339
Total	￦	142,075	￦	127,793

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Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2020

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, 2018, 2019 and 2020, is calculated as follows:

	2018		2019		2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703	￦	700,889
Weighted average number of ordinary shares outstanding (In number of shares)		245,049,466		245,171,283		245,207,307
Basic earnings per share (In Korean won)		2,634		2,634		2,858

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, 2018, 2019 and 2020 is calculated as follows:

	2018		2019			2020
Profit attributable to ordinary shares (In millions of Korean won)	￦	645,571	￦	645,703		￦	700,889
Adjustment to net income attributable to ordinary shares (In millions of Korean won)		—		(157	)		—
Diluted profit attributable to ordinary shares (In millions of Korean won)		645,571		645,546			700,889
Number of dilutive potential ordinary shares outstanding (In number of shares)		1,163		70,267			69,598
Weighted average number of ordinary shares outstanding (In number of shares)		245,050,629		245,241,550			245,276,905
Diluted earnings per share (In Korean won)		2,634		2,632			2,858

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Cash Generated from Operations (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Cash Flows from Operating Activities

Cash flows from operating activities for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
1. Profit for the year	￦	719,412		￦	695,868		￦	746,256
2. Adjustments to reconcile net income
Income tax expense		314,565			320,060			285,349
Interest income		(265,817	)		(303,722	)		(291,425	)
Interest expense		296,894			278,975			265,035
Dividends income		(2,910	)		(3,408	)		(4,442	)
Depreciation		2,735,413			2,567,754			2,635,307
Amortization of intangible assets		629,526			660,705			628,154
Depreciation of right-of-use assets		—			433,199			404,174
Provision for severance benefits		245,926			256,525			255,615
Impairment losses on trade receivables		113,064			60,193			139,957
Share of net profit or loss of associates and joint ventures		5,912			3,252			(18,041	)
Loss(gain) on disposal of associates and joint ventures		(3,737	)		30			111
Loss(gain) on disposal of right-of-use assets		—			1,556			2,047
Impairment losses on assets held for sale		—			7,586			—
Loss on disposal of property and equipment and investment in properties		68,688			49,284			55,590
Loss(gain) on disposal of intangible assets		(4,256	)		(1,248	)		246
Loss on impairment of intangible assets		12,997			61,899			211,636
Loss(gain) on foreign currency translation		68,952			75,998			(138,011	)
Loss(gain) on valuation and settlement of derivatives, net		(92,210	)		(70,482	)		155,600
Loss(gain) on disposal of financial assets at fair value through profit or loss		(1,712	)		(5,115	)		329
Gain on valuation of financial assets at fair value through profit or loss		(10,768	)		(4,335	)		(59,044	)
Loss(gain) on disposal of financial assets at amortized cost		(44	)		43			(138	)
Others		(55,969	)		143,500			127,949
3. Changes in operating assets and liabilities
Decrease(increase) in trade receivables		(81,217	)		(433,292	)		66,462
Decrease(Increase) in other receivables		356,643			(79,130	)		685,209
Decrease(increase) in other current assets		(123,258	)		984			9,089
Decrease(increase) in other non-current assets		19,556			(178,180	)		(86,039	)
Decrease(increase) in inventories		(480,543	)		240,488			288,507
Increase(decrease) in trade payables		(167,841	)		44,354			(135,760	)
Decrease in other payables		(448,301	)		(102,375	)		(1,232,646	)
Increase in other current liabilities		291,548			43,384			127,076
Increase(decrease) in other non-current liabilities		144,072			(199,547	)		(56,319	)
Decrease(Increase) in provisions		85,946			(12,164	)		2,264
Decrease(Increase) in deferred revenue		48,201			641			(1,948	)
Increase in plan assets		(53,301	)		(375,499	)		(136,336	)
Payment of severance benefits		(153,209	)		(119,716	)		(186,520	)
4. Cash generated from operations (1+2+3)	￦	4,212,222		￦	4,058,065		￦	4,745,293

Summary of Significant Transactions not Affecting Cash Flows

Significant transactions not affecting cash flows for the years ended December 31, 2018, 2019 and 2020, are as follows:

(In millions of Korean won)	2018			2019			2020
Reclassification of the current portion of borrowings	￦	1,149,599		￦	1,030,056		￦	1,229,359
Reclassification of construction-in-progress to property and equipment		1,988,014			2,698,146			3,011,519
Reclassification of accounts payable from property and equipment		122,185			685,859			22,052
Reclassification of accounts payable from intangible assets		584,595			(356,911	)		(345,675	)
Reclassification of payable from defined benefit liability		(31,838	)		(19,053	)		72,346
Reclassification of payable from plan assets		(9,497	)		(14,298	)		66,046

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Changes in Liabilities Arising from Financing Activities (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Changes in Liabilities Arising from Financial Activities

Changes in liabilities arising from financing activities, liabilities related to cashflow to be classified as future financing activities, for the years ended December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	2019
	Beginning			Cash flows			Non-cash													Ending
							Changes in Accounting Policy1		Newly acquired		Exchange difference			Fair Value changes			Others
Borrowing	￦	6,648,294		￦	574,175		￦	—	￦	—	￦	64,398		￦	—		￦	12,000		￦	7,298,867
Lease liabilities		163,858			(485,444	)		771,410		774,906		—			—			(13,379	)		1,211,351
Derivative liabilities		65,067			(9,734	)		—		—		(4,234	)		(20,058	)		(10,945	)		20,096
Derivative assets		(29,843	)		33,635			—		—		(53,729	)		(11,398	)		2,759			(58,576	)
Total	￦	6,847,376		￦	112,632		￦	771,410	￦	774,906	￦	6,435		￦	(31,456	)	￦	(9,565	)	￦	8,471,738

1 For information on the financial impacts due to change in accounting policy, see Note 41.

(In millions of Korean won)	2020
	Beginning			Cash flows			Non-cash													Ending
							Newly acquired		Exchange difference			Fair Value changes			Change in Consolidati- on Scope		Others
Borrowing	￦	7,298,867		￦	167,867		￦	17,523	￦	(157,985	)	￦	—		￦	—	￦	(9,974	)	￦	7,316,298
Lease liabilities		1,211,351			(447,784	)		473,477		(3	)		40			3,564		(97,005	)		1,143,640
		—			(13,674	)		13,674		—			—			—		—			—
Derivative liabilities		20,096			(943	)		2,798		142,511			(23,669	)		—		(10,220	)		130,573
Derivative assets		(58,576	)		34,933			—		2,870			(3,456	)		—		16,623			(7,606	)
Total	￦	8,471,738		￦	(259,601	)	￦	507,472	￦	(12,607	)	￦	(27,085	)	￦	3,564	￦	(100,576	)	￦	8,582,905

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Segment Information

Details of each segment for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	17,724,320		￦	933,191		￦	2,917,163
Finance		3,771,681			148,440			22,580
Satellite TV		690,821			66,735			98,310
Others		5,159,459			53,316			236,715
		27,346,281			1,201,682			3,274,768
Elimination		(3,910,231	)		(100,822	)		6,964
Consolidated amount	￦	23,436,050		￦	1,100,860		￦	3,281,732

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2019
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1
ICT	￦	18,527,631		￦	634,046		￦	3,229,159
Finance		3,795,185			158,235			27,852
Satellite TV		694,637			69,357			94,992
Others		5,845,973			218,402			357,294
		28,863,426			1,080,040			3,709,297
Elimination		(3,964,237	)		(53,070	)		(79,805	)
Consolidated amount	￦	24,899,189		￦	1,026,970		￦	3,629,492

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

	2020
(In millions of Korean won)	Operating revenues			Operating Income			Depreciation and Amortization1,2
ICT	￦	18,275,765		￦	809,741		￦	3,233,878
Finance		3,686,430			85,008			53,098
Satellite TV		706,631			71,345			84,931
Others		5,944,093			209,078			346,215
		28,612,919			1,175,172			3,718,122
Elimination		(4,172,272	)		(152,839	)		(83,838	)
Consolidated amount	￦	24,440,647		￦	1,022,333		￦	3,634,284

1 Sum of the amortization of tangible assets, intangible assets, investment properties, and right-of-use assets.

2 Property and equipment and intangible assets associated with ICT reporting segment are ￦ 13,583,173 million.

Summary of Operating Revenues and Non Current Assets by Geographical Regions

Operating revenues for the years ended December 31, 2018, 2019 and 2020 and non-current assets as at December 31, 2019 and 2020 by geographical regions, are as follows:

(In millions of Korean won)	Operating revenues						Non-current assets1
Location	2018		2019		2020		2019.12.31		2020.12.31
Domestic	￦	23,376,218	￦	24,832,068	￦	24,368,729	￦	19,198,416	￦	18,934,766
Overseas		59,832		67,121		71,918		76,679		18,243
Total	￦	23,436,050	￦	24,899,189	￦	24,440,647	￦	19,275,095	￦	18,953,009

1 Non-current assets include property and equipment, intangible assets, investment properties and right-of-use assets.

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, are as follows:

		December 31, 2019
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	608	￦	23,100	￦	—	￦	57,907
	K Bank, Inc.		583		13,664		557		—
	Others		434		1,177		711		—
Total		￦	1,625	￦	37,941	￦	1,268	￦	57,907

		December 31, 2020
		Receivables				Payables
(In millions of Korean won)		Trade receivables		Other receivables		Other payables		Lease liabilities
Associates and joint ventures	K- Realty CR-REITs No.1	￦	457	￦	16,200	￦	—	￦	20,857
	K Bank, Inc.		775		32,964		891		—
	Others		72		1,147		858		—
Total		￦	1,304	￦	50,311	￦	1,749	￦	20,857

Summary of Significant Transactions With Related Parties

Significant transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

		2018
(In millions of Korean won)		Sales	Purchases1	Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦2,088	￦31,984	￦8,932
	MOS GS Co., Ltd. 2	493	12,023	8
	MOS Daegu Co., Ltd. 2	229	8,775	8
	MOS Chungcheong Co., Ltd. 2	540	9,159	8
	MOS Gangnam Co., Ltd. 2	333	11,549	10
	MOS GB Co., Ltd. 2	1,378	16,519	12
	MOS BS Co., Ltd. 2	324	11,193	10
	MOS Honam Co., Ltd. 2	331	10,499	10
	K Bank, Inc.	15,705	7,004	—
	NgeneBio 3	3	—	—
	Others	2,888	9,547	2,148
Total		￦24,312	￦128,252	￦11,146

1 The 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

		2019
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	1,302	￦	—
	K Bank, Inc.		17,815		8,524
	Others		1,498		10,531
Others	K-REALTY CR-REIT 10 1		2,801		—
	Total	￦	23,416	￦	19,055

1 The amounts include acquisition of property and equipment and others.

		December 31, 2019
(In millions of Korean won)		Acquisition of lease receivables		Acquisition of right-of-use assets		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1	￦	—	￦	776	￦	2,225	￦	10,928
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		—		4,280
	Others		—		—		—		146
	Total	￦	—	￦	776	￦	2,225	￦	15,354

		2020
(In millions of Korean won)		Sales		Purchases1
Associates and joint ventures	K- Realty CR-REITs No.1	￦	2,298	￦	—
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—
	K Bank, Inc.		15,658		8,227
	Others		809		10,272
	Total	￦	18,765	￦	18,499

1 The amounts include acquisition of primarily property and equipment.

		December 31, 2020
(In millions of Korean won)		Interest income		Interest expense		Dividend income
Associates and joint ventures	K- Realty CR-REITs No.1		￦—		￦917		￦8,061
	Korea Information & Technology Investment Fund (KIF Investment Fund)		—		—		9,241
	K Bank, Inc.		14		—		—
	Others		—		—		43
	Total	￦	14	￦	917	￦	17,345

Summary of Key Management Compensation

Key management compensation for the years ended December 31, 2018, 2019 and 2020, consists of:

(In millions of Korean won)	2018		2019		2020
Salaries and other short-term benefits	￦	2,762	￦	2,955	￦	2,086
Post-employment benefits		751		321		390
Stock-based compensation		878		891		5,613
Total	￦	4,391	￦	4,167	￦	8,089

Summary of Fund Transactions With Related Parties

Fund transactions with related parties for the years ended December 31, 2018, 2019 and 2020, are as follows:

	2018
(In millions of Korean won)	Equity contributions in cash and others
Associates and joint ventures
PHI Healthcare Inc. (HooH Healthcare Inc.)	￦	1,000
KT-CKP New Media Investment Fund		(1,229	)
PT. Mitra Transaksi Indonesia 1		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
K-REALTY CR REIT 1		—
Korea Information & Technology Investment Fund		—
MOS GS Co., Ltd. 2		(147	)
MOS Daegu Co., Ltd. 2		(147	)
MOS Chungcheong Co., Ltd. 2		(153	)
MOS Gangnam Co., Ltd. 2		(180	)
MOS GB Co., Ltd. 2		(203	)
MOS BS Co., Ltd. 2		(183	)
MOS Honam Co., Ltd. 2		(206	)
Daiwon Broadcasting Co., Ltd.		—
Boston Global Film & Contents Fund L.P.		(986	)
Gyeonggi-KT Green Growth Fund		—
Total	￦	24,713

1 It is the amount before reclassification to assets held for sale.

2 It is the amount before included in consolidation during the year.

	December 31, 2019
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing 2		Repayment
KT-IBKC Future Investment Fund1	￦	—	￦	—	￦	3,750
KT Philippines co. Ltd.		—		—		99
Virtua Realm Sendirian Berhad		—		—		550
K-REALTY CR REIT 1		—		30,385		—
K Bank, Inc		—		—		21,782
KIF Investment Fund		—		—		—
Daiwon Broadcasting Co.,Ltd.		—		—		—
JB Emerging Market Specialty Investment Private Equity Trust No.1		—		—		—
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
KT-CKP New Media Investment Fund		—		—		(174	)
KT-DSC creative economy youth start-up investment fund		—		—		(1,800	)
KT-Smart Factory Investment Fund		—		—		2,800
KT-SB Venture Investment Fund		—		—		(2,404	)
Total	￦	—	￦	30,385	￦	25,603

1 Borrowing transactions include lease transactions.

2 Conversion effect from the adoption of IFRS 16 Lease on January 1, 2019 has been excluded.

	December 31, 2020
	Borrowing transaction1				Equity contributions in cash
(In millions of Korean won)	Borrowing		Repayment
K- Realty CR-REITs No.1	￦	—	￦	20,304	￦	—
Studio Discovery Co. Ltd.		—		—		3,000
KT Young Entrepreneurs DNA Investment Fund		—		—		3,600
KT-Smart Factory Investment Fund		—		—		2,800
KT-CKP New Media Investment Fund		—		—		(109	)
K Bank Inc.		—		—		195,011
Gyeonggi-KT Yoojin Superman Fund		—		—		1,000
Hyundai Robotics Co. Ltd.		—		—		50,000
Total	￦	—	￦	20,304	￦	255,302

1 Borrowing transactions include lease transactions.

As at December 31, 2020, there is no collateral or payment guarantee provided to or from related parties.

XML

Financial Risk Management (Tables)

12 Months Ended

Dec. 31, 2020

Statement [LineItems]

Summary of Maximum Exposure to Credit Risk

The maximum exposure to credit risk of the Group’s financial instruments without considering value of collaterals as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019		December 31, 2020
Cash and cash equivalents (except for cash on hand)	￦	2,226,608	￦	2,625,581
Trade and other receivables
Financial assets at amortized costs		5,784,228		5,034,621
Financial assets at fair value through other comprehensive income		1,256,266		1,118,619
Contract assets		557,041		586,438
Other financial assets
Derivatives financial assets for hedging		58,576		7,684
Financial assets at fair value through profit or loss		541,657		680,453
Financial assets at fair value through other comprehensive income		7,086		6,570
Financial assets at amortized costs		441,804		671,068
Total	￦	10,873,266	￦	10,731,034

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 consolidated financial statements.

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	8,149,445	￦	805,241	￦	370,044	￦	9,324,730
Borrowings(including debentures)		1,304,936		4,417,639		2,493,637		8,216,212
Lease liabilities		397,609		688,518		221,255		1,307,382
Other non-derivative financial liabilities		1,749		175,764		18,962		196,475
Financial guarantee contracts1		19,422		—		—		19,422
Total	￦	9,873,161	￦	6,087,162	￦	3,103,898	￦	19,064,221

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.

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Trade and other payables	￦	6,587,796	￦	730,758	￦	258,255	￦	7,576,809
Borrowings(including debentures)		1,573,944		4,373,534		2,258,360		8,205,838
Lease liabilities		336,024		658,501		190,907		1,185,432
Other non-derivative financial liabilities		574		131,242		—		131,816
Financial guarantee contracts1		22,422		—		—		22,422
Total	￦	8,520,760	￦	5,894,035	￦	2,707,522	￦	17,122,317

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

Cash outflow and inflow of derivatives settled gross or net are undiscounted contractual cash flow and can differ from the amount in the consolidated financial statements.

	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

	December 31, 2019
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	650,497	￦	1,602,513	￦	507,947	￦	2,760,957
Inflow		684,720		1,648,746		524,483		2,857,949

	December 31, 2020
(In millions of Korean won)	Less than 1 year		1-5 years		More than 5 years		Total
Outflow	￦	248,300	￦	2,179,046	￦	498,619	￦	2,925,965
Inflow		249,301		2,074,747		480,570		2,804,618

Summary of Debt-to-equity Ratios

The debt-to-equity ratios as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019			December 31, 2020
Total liabilities	￦	19,491,530		￦	18,111,112
Total equity		15,140,684			15,551,433
Debt-to-equity ratio		129	%		116	%

Summary of Gearing Ratios

The gearing ratios as at December 31, 2019 and 2020, are as follows:

(In millions of Korean won, %)	December 31, 2019			December 31, 2020
Total borrowings	￦	7,298,867		￦	7,316,298
Less: cash and cash equivalents		(2,305,894	)		(2,634,624	)
Net debt		4,992,973			4,681,674
Total equity		15,140,684			15,551,433
Total capital		20,133,657			20,233,107
Gearing ratio		25	%		23	%

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, 2019
	Gross assets		Gross liabilities offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade receivables	￦	66,487	￦	(1	)	￦	66,486	￦	(63,604	)	￦	—	￦	2,882
Other financial assets		18,571		(13	)		18,558		(18,526	)		—		32
	￦	85,058	￦	(14	)	￦	85,044	￦	(82,130	)	￦	—	￦	2,914

(In millions of Korean won)

December 31, 2020

Gross assets

Gross liabilities offset

Net amounts presented in the statement of financial position

Amounts not offset

Net amount

Financial instruments

Cash collateral

Trade receivables

￦

71,497

￦

(1

)

￦

71,496

￦

(67,421

)

￦

—

￦

4,075

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, 2019
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	65,669	￦	(13	)	￦	65,656	￦	(63,628	)	￦	—	￦	2,028
Other financial liabilities		18,509		(1	)		18,508		(18,502	)		—		6
	￦	84,178	￦	(14	)	￦	84,164	￦	(82,130	)	￦	—	￦	2,034

(In millions of Korean won)	December 31, 2020
	Gross liabilities		Gross assets offset			Net amounts presented in the statement of financial position		Amounts not offset					Net amount
								Financial instruments			Cash collateral
Trade payables	￦	69,361	￦	—		￦	69,361	￦	(67,421	)	￦	—	￦	1,940
Other financial liabilities		1		(1	)		—		—			—		—
	￦	69,362	￦	(1	)	￦	69,361	￦	(67,421	)	￦	—	￦	1,940

Currency risk [Member]

Statement [LineItems]

Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity

As at December 31, 2018, 2019 and 2020, 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
2018.12.31		10	%	￦	7,212		￦	10,196
		-10	%		(12,413	)		(9,625	)
2019.12.31		10	%	￦	45,149		￦	52,092
		-10	%		(45,149	)		(52,092	)
2020.12.31		10	%	￦	25,220		￦	36,961
		-10	%		(25,220	)		(36,961	)

Summary of Details of Financial Assets and Liabilities in Foreign Currencies

Details of financial assets and liabilities in foreign currencies as at December 31, 2018, 2019 and 2020, are as follows:

(In thousands of foreign currencies)	2018				2019				2020
	Financial assets		Financial liabilities		Financial assets		Financial liabilities		Financial assets		Financial liabilities
USD		528,539		1,893,849		645,941		1,830,764		400,046		1,937,935
SDR1		267		730		255		729		255		728
JPY		66,078		50,000,000		24,930		80,000,000		209,376		46,000,009
GBP		—		256		—		56		—		—
EUR		2		6		1		6		316		162
DZD2		618		—		—		—		—		—
CNY		1,954		171		457		161		458		491
UZS3		121,053		—		—		—		—		—
RWF4		857		—		706		—		646		—
THB5		—		—		—		—		535		—
MMK6		84		—		84		—		—		—
TZS7		—		2,876		6,919		—		1,019		—
BWP8		897		—		911		—		212		—
HKD		—		—		—		268		—		198
BDT9		39,494		—		18,897		—		—		—
PLN10		26		—		—		—		26		—
VND11		467,272		—		271,563		—		242,370		—
XAF12		666		—		97,411		—		16,229		—
SGD		—		—		—		—		6		284,000

1  Special Drawing Rights.

2  Algeria Dinar.

3  Uzbekistan Sum.

4  Rwanda Franc.

5  Thailand Bhat.

6  Myanmar Kyat.

7  Tanzanian Shilling.

8  Botswana Pula.

9  Bangladesh Taka.

10  Polish Zloty.

11  Vietnam Dong.

12  Central African 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, 2018, 2019 and 2020, 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
2018.12.31	10%	￦	12		￦	898
	-10%		(12	)		(898	)
2019.12.31	10%	￦	24		￦	613
	-10%		(24	)		(613	)
2020.12.31	10%	￦	2,811		￦	3,472
	-10%		(2,811	)		(3,472	)

Interest rate risk [Member]

Statement [LineItems]

Summary of Exposures to Risks, Effects on Profit before Income Tax and Shareholders' Equity

As at December 31, 2018, 2019 and 2020, 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
2018.12.31		+ 100 bp	￦	1,059		￦	9,689
		- 100 bp		(1,958	)		(10,237	)
2019.12.31		+ 100 bp	￦	425		￦	14,764
		- 100 bp		(482	)		(19,280	)
2020.12.31		+ 100 bp	￦	973		￦	18,584
		- 100 bp		(973	)		(19,377	)

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Fair Value (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, are as follows:

	December 31, 2019				December 31, 2020
(In millions of Korean won)	Carrying amount		Fair value		Carrying amount		Fair value
Financial assets
Cash and cash equivalents	￦	2,305,894		1	￦	2,634,624		1
Trade and other receivables
Financial assets measured at amortized cost 2		5,748,459		1		4,976,423		1
Financial assets at fair value through other comprehensive income		1,256,266		1,256,266		1,118,619		1,118,619
Other financial assets
Financial assets measured at amortized cost		441,804		1		671,068		1
Financial assets at fair value through profit or loss		632,324		632,324		809,919		809,919
Financial assets at fair value through other comprehensive income		557,342		557,342		258,516		258,516
Derivative financial assets for hedging		58,576		58,576		7,684		7,684
Total	￦	11,000,665			￦	10,476,853
Financial liabilities
Trade and other payables	￦	8,679,698		1	￦	7,017,639		1
Borrowings		7,298,867		1		7,316,298		1
Other financial liabilities
Financial liabilities at amortized cost		129,945		1		132,558		1
Financial liabilities at fair value through profit or loss		38		38		2,682		2,682
Derivative financial liabilities for hedging		20,096		20,096		127,929		127,929
Total	￦	16,128,644			￦	14,597,106

1 The Group did not conduct fair value estimation since the book amount is a reasonable approximation of the fair value

2 With the application of IFRS 7, lease receivables are excluded from fair value disclosure.

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,256,266	￦	—	￦	1,256,266
Other financial assets
Financial assets at fair value through profit or loss		232		136,951		495,141		632,324
Financial assets at fair value through other comprehensive income		6,738		508,550		42,054		557,342
Derivative financial assets for hedging		—		40,788		17,788		58,576
Disclosed fair value
Investment properties		—		—		2,304,583		2,304,583
Total	￦	6,970	￦	1,942,555	￦	2,859,566	￦	4,809,091
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	38	￦	—	￦	38
Derivative financial liabilities for hedging		—		20,096		—		20,096
Total	￦	—	￦	20,134	￦	—	￦	20,134

(In millions of Korean won)	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	—	￦	1,118,619	￦	—	￦	1,118,619
Other financial assets
Financial assets at fair value through profit or loss		46,449		330,961		432,509		809,919
Financial assets at fair value through other comprehensive income		5,606		202,121		50,789		258,516
Derivative financial assets for hedging		—		7,684		—		7,684
Disclosed fair value
Investment properties		—		—		2,645,482		2,645,482
Total	￦	52,055	￦	1,659,385	￦	3,128,780	￦	4,840,220
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	—	￦	45	￦	2,637	￦	2,682
Derivative financial liabilities for hedging		—		123,735		4,194		127,929
Total	￦	—	￦	123,780	￦	6,831	￦	130,611

Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements

Details of changes in Level 3 of the fair value hierarchy for the recurring fair value measurements as at December 31, 2019 and 2020, are as follows:

	2019
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Derivative financial assets (liabilities) for hedging			Financial liabilities at fair value through profit or loss
Beginning balance	￦	163,600		￦	311,536		￦	(10,183	)	￦	7,758
Purchases		584,671			6,081			—			—
Reclassification		225,873			(444,782	)		—			—
Disposal		(485,419	)		(941	)		—			(9,734	)
Amount recognized in profit or loss1,2		6,416			—			14,462			1,976
Amount recognized in other comprehensive income1		—			170,160			13,509			—
Ending balance	￦	495,141		￦	42,054		￦	17,788		￦	—

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

	2020
	Financial assets						Financial liabilities
(In millions of Korean won)	Financial assets at fair value through profit or loss			Financial assets at fair value through other comprehensive income			Financial liabilities at fair value through profit or loss			Derivative financial assets (liabilities) for hedging
Beginning balance	￦	495,141		￦	42,054		￦	—		￦	(17,788	)
Purchases		374,259			13,142			2,798			—
Reclassification		208			—			—			—
Disposal		(451,663	)		(571	)		—			—
Amount recognized in profit or loss1,2		14,564			(428	)		(161	)		29,345
Amount recognized in other comprehensive income1		—			(3,408	)		—			(7,363	)
Ending balance	￦	432,509		￦	50,789		￦	2,637		￦	4,194

1 Amount recognized in profit or loss and other comprehensive income with respect to derivative financial liabilities for hedging comprises loss on valuation of derivative instruments.

2 Amount recognized in profit or loss with respect to financial liabilities at fair value through profit or loss comprises loss on valuation of derivative instruments.

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, 2019 and 2020, are as follows:

	December 31, 2019
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,256,266		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		632,092		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		550,604		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		58,576		2,3	Hull-White model, DCF Model
Investment properties		2,304,583		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	38		2	DCF Model
Derivative financial liabilities for hedging		20,096		2	DCF Model

	December 31, 2020
(In millions of Korean won)	Fair value		Level		Valuation techniques
Assets
Trade and other receivables
Financial assets at fair value through other comprehensive income	￦	1,118,619		2	DCF Model
Other financial assets
Financial assets at fair value through profit or loss		763,470		2,3	DCF Model, Adjusted net asset model
Financial assets at fair value through other comprehensive income		252,910		2,3	DCF Model, Comparable Company Analysis
Derivative financial assets for hedging		7,684		2	DCF Model
Investment properties		2,645,482		3	DCF Model
Liabilities
Other financial liabilities
Financial liabilities at fair value through profit or loss	￦	2,682		2,3	DCF Model, Binomial Option Pricing
Derivative financial liabilities for hedging		127,929		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, 2019 and 2020, are as follows:

	2019						2020
(In millions of Korean won)	Derivatives used for hedging			Derivative held for trading			Derivatives used for hedging			Derivative held for trading
I. Beginning balance	￦	5,107		￦	(2,824	)	￦	3,682		￦	—
II. New transactions		—			—			—			—
III. Recognized at fair value through profit or loss		(1,425	)		2,824			(1,425	)		—
IV. Ending balance (I+II+III)	￦	3,682		￦	—		￦	2,257		￦	—

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Interests in Unconsolidated Structured Entities (Tables)

12 Months Ended

Dec. 31, 2020

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, 2019 and 2020, are as follows:

(In millions of Korean won)	December 31, 2019
	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	1,595,895	￦	4,060,992	￦	2,562,931	￦	8,219,818
Assets recognized in statement of financial position
Other financial assets	￦	15,816	￦	100,496	￦	—	￦	116,312
Joint ventures and associates		8,542		192,022		—		200,564
Total	￦	24,358	￦	292,518	￦	—	￦	316,876
Maximum loss exposure1
Investment assets	￦	24,358	￦	292,518	￦	—	￦	316,876
Total	￦	24,358	￦	292,518	￦	—	￦	316,876

1 It includes the investments recognized in the Group’s consolidated 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.

	December 31, 2020
(In millions of Korean won)	Real Estate Finance		PEF and Investment Funds		Asset Securitization		Total
Total assets of unconsolidated structured entities	￦	2,004,869	￦	4,380,534	￦	2,152,412	￦	8,537,815
Assets recognized in statement of financial position
Other financial assets	￦	29,874	￦	128,332	￦	—	￦	158,206
Joint ventures and associates		51,607		219,753		—		271,360
Total	￦	81,481	￦	348,085	￦	—	￦	429,566
Maximum loss exposure1
Investment assets	￦	81,481	￦	348,085	￦	—	￦	429,566
Cash deficiency support		—		29,130		—		29,130
Total	￦	81,481	￦	377,215	￦	—	￦	458,696

1 It includes the investments recognized in the Group’s consolidated 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, 2020

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, 2018, 2019 and 2020 are as follows:

(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.		49.7	%	￦	328,302	￦	23,405		￦	(8,279	)	￦	30,722		￦	374,150
BC Card Co., Ltd.		30.5	%		339,067		28,418			(35,924	)		13,986			345,547
KT Powertel Co., Ltd.		55.2	%		53,053		(3,058	)		—			2,870			52,865
KT Hitel Co.,Ltd.		32.9	%		53,146		454			—			(1,264	)		52,336
KT Telecop Co., Ltd.		13.2	%		103,468		59			—			(170	)		103,357

(In millions of Korean won)	December 31, 2019
	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.		49.7	%	￦	374,150	￦	10,029		￦	(8,279	)	￦	6		￦	375,906
BC Card Co., Ltd.		30.5	%		345,547		37,795			(18,900	)		53,033			417,475
KT Powertel Co., Ltd.		55.2	%		52,865		1,751			—			(340	)		54,276
KT Hitel Co., Ltd.		32.9	%		52,336		1,720			—			653			54,709
KT Telecop Co., Ltd.		13.2	%		103,357		(588	)		—			(99,119	)		3,650

(In millions of Korean won)	December 31, 2020
	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.		49.7	%	￦	375,906	￦	22,171		￦	(8,279	)	￦	(898	)	￦	388,900
BC Card Co., Ltd.		30.5	%		417,475		9,899			(22,787	)		7,239			411,826
KT Powertel Co., Ltd.		55.2	%		54,276		2,151			(478	)		(202	)		55,747
KT Hitel Co., Ltd.		32.9	%		54,709		(1,840	)		—			(2,563	)		50,306
KT Telecop Co., Ltd.		13.2	%		3,650		152			—			(208	)		3,594

Summary of Financial Information on Subsidiaries

Summarized consolidated statements of financial position as at December 31, 2018, 2019 and 2020, are as follows:

	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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
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

	December 31, 2019
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	459,077		￦	2,580,634		￦	86,465		￦	115,694		￦	55,908
Non-current assets		389,199			1,332,348			31,587			164,124			223,969
Current liabilities		123,506			2,452,219			17,757			62,378			64,218
Non-current liabilities		19,333			142,013			2,009			12,391			89,622
Equity		705,437			1,318,750			98,286			205,049			126,037
Operating revenue		704,996			3,553,008			62,846			323,065			332,063
Profit or loss for the year		56,008			115,885			3,085			1,426			(4,875	)
Total comprehensive income (loss)		55,936			289,122			2,469			(1,840	)		(6,558	)
Cash flows from operating activities		152,549			429,331			780			49,870			52,693
Cash flows from investing activities		(101,594	)		(419,894	)		(9,525	)		(50,138	)		(44,393	)
Cash flows from financing activities		(18,833	)		(5,744	)		(687	)		(1,860	)		(5,227	)
Net increase (decrease) in cash and cash equivalents		32,122			3,693			(9,432	)		(2,128	)		3,073
Cash and cash equivalents at beginning of year		31,728			275,089			15,649			39,186			5,708
Exchange differences		—			380			—			(15	)		—
Cash and cash equivalents at end of year		63,850			279,162			6,217			37,043			8,781

	December 31, 2020
(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 (%)		49.7	%		30.5	%		55.2	%		32.9	%		13.2	%
Current assets	￦	480,450		￦	1,785,914		￦	90,056		￦	140,948		￦	79,076
Non-current assets		439,026			1,298,484			29,638			148,001			239,380
Current liabilities		153,236			1,602,667			17,045			74,045			136,565
Non-current liabilities		21,803			176,083			1,788			18,554			57,172
Equity		744,437			1,305,648			100,861			196,350			124,719
Operating revenue		706,631			3,387,641			65,898			350,231			392,489
Profit or loss for the year		58,190			39,455			3,809			2,080			212
Total comprehensive income (loss)		55,647			61,796			3,442			(8,700	)		(1,319	)
Cash flows from operating activities		160,934			(119,163	)		6,011			62,521			35,834
Cash flows from investing activities		(105,293	)		58,042			(3,353	)		(58,186	)		(57,976	)
Cash flows from financing activities		(19,650	)		22,790			(1,515	)		(1,856	)		14,652
Net increase (decrease) in cash and cash equivalents		35,991			(38,331	)		1,143			2,479			(7,490	)
Cash and cash equivalents at beginning of year		63,850			279,162			6,217			37,043			8,781
Exchange differences		(7	)		(247	)		—			(83	)		—
Cash and cash equivalents at end of year		99,834			240,584			7,360			39,439			1,291

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 2018, 2019 and 2020 is summarized as follows:

(In millions of Korean won)	2018			2019			2020
Carrying amount of non-controlling interests acquired	￦	(194	)	￦	(9,566	)	￦	1,750
Consideration paid to non-controlling interests		11,312			484			9,878
Excess of consideration paid recognized in parent’s equity	￦	11,118		￦	(9,082	)	￦	11,628

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Business Combination (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Business Combination

As of the acquisition date of control, the total consideration transferred, the recognized amount of assets acquired and liabilities acquired by major types, and calculation details of goodwill are as follows:

(In millions of Korean won)	Amount
Total transfer cost (a)	￦	46,800
Recognized amount of assets acquired and liabilities assumed (b)1		46,393
Cash and cash equivalents		57,845
Trade and other receivable		95,814
Other financial assets		3,110
Other assets		14,021
Inventories		1,521
Property and equipment		3,128
Intangible assets		410
Trade and other payables		(105,964	)
Other liabilities		(4,815	)
Current income tax liabilities		(3,664	)
Other provisions		(13,745	)
Retirement benefit liabilities		(1,268	)
Goodwill (a-b)	￦	407

1 Assets acquired and liabilities acquired in accordance with IFRS 3 Business Combinations are measured at fair value.

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Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Disclosure Of Detailed Information About Impact On Consolidated Financial Statements Due to Application of Accounting Policy Explanatory

In relation to the changes in accounting policy, the adjusted amounts recognized in each line item in the consolidated financial statements are as follows:

Consolidated Statements of Financial Position

	December 31, 2019							December 31, 2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Current assets
Prepaid expenses	￦	76,036	￦	(1,026	)	￦	75,010	￦	61,930	￦	(2,119	)	￦	59,811
Non-current assets
Right-of-use assets		788,497		479,832			1,268,329		585,034		632,145			1,217,179
Current liabilities
Lease liabilities	￦	355,833	￦	36,600		￦	392,433	￦	281,961	￦	63,263		￦	345,224
Non-current liabilities
Lease liabilities		373,307		445,612			818,919		231,884		566,532			798,416
Total liabilities	￦	729,140	￦	482,212		￦	1,211,352	￦	513,845	￦	629,795		￦	1,143,640
Net assets
Retained earnings	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420
Total equity	￦	11,594,322	￦	(3,406	)	￦	11,590,916	￦	12,155,188	￦	232		￦	12,155,420

Consolidated Statements of Operations

	2019							2020
(In millions of Korean won)	Previously reported amount		Adjustment			Adjusted amount		Amount based on previous policy		Adjustment			Amount based on changed policy
Operating revenue	￦	24,899,189	￦	—		￦	24,899,189	￦	24,434,851	￦	5,796		￦	24,440,647
Operating expenses		23,879,015		(6,796	)		23,872,219		23,425,377		(7,063	)		23,418,314
Finance income		424,395		—			424,395		498,614		—			498,614
Finance costs		421,931		10,202			432,133		498,161		9,222			507,383
Income tax expense		320,060		—			320,060		285,349		—			285,349
Profit for the year		699,274		(3,406	)		695,868		742,619		3,637			746,256
Basic earnings per share		2,648		(14	)		2,634		2,843		15			2,858
Diluted earnings per share		2,646		(14	)		2,632		2,840		18			2,858

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Events after Reporting Period (Tables)

12 Months Ended

Dec. 31, 2020

Text block [abstract]

Summary of Public Bonds Issued After Reporting Period

The Group has issued the following bonds since the end of the reporting period.

Type	Issued date		Face value (In millions of Korean won)		Interest rate			Redemption date
The 194-1st Public bond		Jan. 27, 2021	￦	130,000		1.13	%		Jan. 26, 2024
The 194-2nd Public bond		Jan. 27, 2021		140,000		1.45	%		Jan. 27, 2026
The 194-3rd Public bond		Jan. 27, 2021		50,000		1.85	%		Jan. 27, 2031
The 194-4th Public bond		Jan. 27, 2021		80,000		1.98	%		Jan. 25, 2041

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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

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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of subsidiaries [line items]
Total assets	₩ 33,662,545	₩ 34,632,214
Total liabilities	18,111,112	19,491,530
Operating revenues	24,440,647	24,899,189	₩ 23,436,050
Profit (loss) for the year	₩ 746,256	₩ 695,868	₩ 719,412
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	₩ 119,694	₩ 118,052	₩ 124,064
Type of Business	Trunk Radio System (TRS) business
Total liabilities	₩ 18,833	19,766	28,217
Location	Korea
Operating revenues	₩ 65,897	₩ 62,846	65,620
Controlling percentage ownership	44.80%	44.80%
Profit (loss) for the year	₩ 3,809	₩ 3,085	₩ (5,545)
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	₩ 58,372	₩ 70,494	₩ 54,147
Type of Business	Public telephone maintenance
Total liabilities	₩ 54,022	62,088	44,895
Location	Korea
Operating revenues	₩ 84,519	₩ 97,892	106,337
Controlling percentage ownership	92.40%	92.40%
Profit (loss) for the year	₩ (3,212)	₩ (2,258)	₩ 1,216
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	₩ 116,813	₩ 120,947	₩ 130,715
Type of Business	Submarine cable construction and maintenance
Total liabilities	₩ 14,032	18,452	27,530
Location	Korea
Operating revenues	₩ 110,201	₩ 55,244	61,652
Controlling percentage ownership	39.30%	39.30%
Profit (loss) for the year	₩ 1,197	₩ 486	₩ (4,286)
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	₩ 318,456	₩ 279,878	₩ 272,492
Type of Business	Security service
Total liabilities	₩ 193,737	153,841	140,314
Location	Korea
Operating revenues	₩ 392,489	₩ 332,063	328,262
Controlling percentage ownership	86.80%	86.80%
Profit (loss) for the year	₩ 212	₩ (4,875)	₩ 166
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	₩ 288,949	₩ 279,818	₩ 272,708
Type of Business	Data communication
Total liabilities	₩ 92,599	74,769	66,043
Location	Korea
Operating revenues	₩ 350,231	₩ 323,065	279,117
Controlling percentage ownership	67.10%	67.10%
Profit (loss) for the year	₩ 2,080	₩ 1,426	₩ 657
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	₩ 60,825	₩ 64,802	₩ 30,599
Type of Business	Opening services of fixed line
Total liabilities	₩ 56,554	58,984	23,964
Location	Korea
Operating revenues	₩ 217,451	₩ 219,427	195,961
Controlling percentage ownership	67.30%	67.30%
Profit (loss) for the year	₩ (871)	₩ (445)	₩ (31)
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	₩ 58,182	₩ 63,917	₩ 37,452
Type of Business	Opening services of fixed line
Total liabilities	₩ 51,460	55,548	27,939
Location	Korea
Operating revenues	₩ 264,776	₩ 266,148	230,088
Controlling percentage ownership	77.30%	77.30%
Profit (loss) for the year	₩ (456)	₩ 280	₩ 160
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.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 No.4 [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
KT Strategic Investment Fund No.5 [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Strategic Investment Fund No.5
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%	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	₩ 3,084,398	₩ 3,912,982	₩ 3,722,379
Type of Business	Credit card business
Total liabilities	₩ 1,778,751	2,594,232	2,630,536
Location	Korea
Operating revenues	₩ 3,387,640	₩ 3,553,008	3,551,715
Controlling percentage ownership	69.50%	69.50%
Profit (loss) for the year	₩ 39,455	₩ 115,885	₩ 70,889
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 Network
Total assets	₩ 269,651	₩ 282,016	₩ 245,841
Type of Business	Call centre for financial sectors
Total liabilities	₩ 61,365	68,401	63,188
Location	Korea
Operating revenues	₩ 322,690	₩ 320,701	297,470
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 2,413	₩ (1,593)	₩ (15,944)
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	64.50%	64.50%
Closing month	December
KTDS Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTDS Co., Ltd.	KTDS Co., Ltd.	KTDS Co., Ltd
Total assets	₩ 183,297	₩ 158,153	₩ 148,675
Type of Business	System integration and maintenance
Total liabilities	₩ 133,129	105,462	95,834
Location	Korea
Operating revenues	₩ 499,990	₩ 428,758	434,302
Controlling percentage ownership	95.50%	95.50%
Profit (loss) for the year	₩ 10,635	₩ 9,027	₩ 8,586
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	₩ 104,704	₩ 74,326	₩ 60,197
Type of Business	Mobile marketing
Total liabilities	₩ 76,315	50,638	42,386
Location	Korea
Operating revenues	₩ 44,860	₩ 33,443	26,673
Controlling percentage ownership	90.00%	90.00%
Profit (loss) for the year	₩ 6,935	₩ 6,771	₩ 3,691
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	₩ 231,260	₩ 248,142	₩ 228,073
Type of Business	PCS distribution
Total liabilities	₩ 197,306	215,777	207,740
Location	Korea
Operating revenues	₩ 661,533	₩ 813,498	791,652
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (485)	₩ 12,732	₩ 11,408
Closing month	December
GENIE Music Corporation K T 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	₩ 250,538	₩ 234,131	₩ 221,559
Type of Business	Online music production and distribution
Total liabilities	₩ 88,488	80,952	75,827
Location	Korea
Operating revenues	₩ 247,237	₩ 230,480	171,314
Controlling percentage ownership	36.20%	36.00%
Profit (loss) for the year	₩ 9,472	₩ 7,658	₩ 6,374
Closing month	December
KT MOS Bukbu Co.,Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Bukbu Co., Ltd.	KT MOS Bukbu Co., Ltd.	KT MOS Bukbu Co., Ltd.
Total assets	₩ 32,167	₩ 33,376	₩ 14,121
Type of Business	Telecommunication facility maintenance
Total liabilities	₩ 26,070	28,841	10,571
Location	Korea
Operating revenues	₩ 67,975	₩ 63,761	16,543
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 1,473	₩ 353	₩ (782)
Closing month	December
KTMOS Nambu Co.,Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT MOS Nambu Co., Ltd.	KT MOS Nambu Co., Ltd.	KT MOS Nambu Co., Ltd.
Total assets	₩ 33,765	₩ 34,258	₩ 14,313
Type of Business	Telecommunication facility maintenance
Total liabilities	₩ 24,947	26,722	8,927
Location	Korea
Operating revenues	₩ 71,259	₩ 67,300	14,941
Controlling percentage ownership	98.40%	98.40%
Profit (loss) for the year	₩ 1,639	₩ 3,099	₩ (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	₩ 919,476	₩ 848,276	₩ 816,001
Type of Business	Satellite broadcasting business
Total liabilities	₩ 175,039	142,839	149,841
Location	Korea
Operating revenues	₩ 706,631	₩ 704,996	694,059
Controlling percentage ownership	50.30%	50.30%
Profit (loss) for the year	₩ 58,190	₩ 56,008	₩ 52,010
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	₩ 1,689,601	₩ 1,686,000	₩ 1,695,995
Type of Business	Residential building development and supply
Total liabilities	₩ 325,429	295,706	304,712
Location	Korea
Operating revenues	₩ 365,335	₩ 485,686	569,269
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 14,370	₩ 48,552	₩ 51,854
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
KTGDH Co., Ltd. (KTSB Data service) [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTGDH Co., Ltd. (KTSB Data Service)	KTGDH Co., Ltd. (KTSB Data service)	KTGDH Co., Ltd. (KTSB Data service)
Total assets	₩ 11,003	₩ 10,437	₩ 8,632
Type of Business	Data centre development and related service
Total liabilities	₩ 1,669	1,628	523
Location	Korea
Operating revenues	₩ 4,282	₩ 3,977	4,627
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 538	₩ 344	₩ (9,576)
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	₩ 630,740	₩ 651,195	₩ 685,926
Type of Business	Satellite communication business
Total liabilities	₩ 92,791	127,523	173,513
Location	Korea
Operating revenues	₩ 173,693	₩ 168,376	137,186
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 14,753	₩ 16,497	₩ 4,921
Closing month	December
Nasmedia Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.	Nasmedia Co., Ltd.
Total assets	₩ 422,039	₩ 356,236	₩ 303,112
Type of Business	Solution provider and IPTV advertisement sales business
Total liabilities	₩ 221,371	203,105	161,164
Location	Korea
Operating revenues	₩ 113,136	₩ 117,550	106,805
Controlling percentage ownership	44.00%	44.00%
Profit (loss) for the year	₩ 23,134	₩ 22,484	20,596
Closing month	December
KT sports [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sports Co., Ltd.	KT Sports Co., Ltd.
Total assets			9,560
Type of Business	Management of sports group
Total liabilities			6,376
Operating revenues			55,565
Profit (loss) for the year			₩ (154)
KT Sports Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Sports Co., Ltd.		KT Sports Co., Ltd.
Total assets	₩ 26,572	₩ 15,603
Total liabilities	₩ 14,940	8,333
Location	Korea
Operating revenues	₩ 46,608	₩ 55,241
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (2,516)	₩ (464)
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	₩ 4,844	₩ 10,579	₩ 14,092
Type of Business	Music contents investment business
Total liabilities	₩ 1,525	1,677	1,035
Location	Korea
Operating revenues	₩ 243	₩ 521	559
Controlling percentage ownership	80.00%	80.00%
Profit (loss) for the year	₩ 84	₩ 345	₩ 294
Closing month	December
K T Music Contents Fund No.2 [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Music Contents Fund No.2	KT Music Contents Fund No.2	KT Music Contents Fund No.2
Total assets	₩ 15,021	₩ 7,675	₩ 7,629
Type of Business	Music contents investment business
Total liabilities	₩ 285	279	281
Location	Korea
Operating revenues	₩ 169	₩ 331	150
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (116)	₩ 48	₩ (142)
Closing month	December
KT-Michigan global content fund [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT-Michigan Global Contents Fund	KT-Michigan Global Content Fund	KT-Michigan Global Content Fund
Total assets	₩ 10,382	₩ 11,688	₩ 12,741
Type of Business	Content investment business
Total liabilities	₩ 175	61	0
Location	Korea
Operating revenues	₩ 111	₩ 248	869
Controlling percentage ownership	88.60%	88.60%
Profit (loss) for the year	₩ (1,420)	₩ (1,113)	₩ (670)
Closing month	December
Autopion Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	Autopion Co., Ltd.	Autopion Co., Ltd.	Autopion Co., Ltd.
Total assets	₩ 4,903	₩ 7,460	₩ 8,838
Type of Business	Information and communication service
Total liabilities	₩ 4,961	4,894	5,801
Location	Korea
Operating revenues	₩ 6,174	₩ 5,604	12,035
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (2,459)	₩ (302)	₩ 453
Closing month	December
KTCS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTCS Corporation	KTCS Corporation	KTCS Corporation
Total assets	₩ 384,919	₩ 378,171	₩ 350,280
Type of Business	Database and online information provider
Total liabilities	₩ 215,175	213,983	188,561
Location	Korea
Operating revenues	₩ 933,006	₩ 944,778	1,019,787
Controlling percentage ownership	31.90%	30.90%
Profit (loss) for the year	₩ 11,323	₩ 7,597	₩ 11,401
Closing month	December
KTIS Corporation [member]
Disclosure of subsidiaries [line items]
Subsidiary	KTIS Corporation	KTIS Corporation	KTIS Corporation
Total assets	₩ 294,289	₩ 305,798	₩ 229,246
Type of Business	Database and online information provider
Total liabilities	₩ 126,894	137,524	68,997
Location	Korea
Operating revenues	₩ 454,172	₩ 454,561	451,532
Controlling percentage ownership	30.80%	30.10%
Profit (loss) for the year	₩ 7,387	₩ 9,205	₩ 7,900
Closing month	December
KT M mobile Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT M Mobile Co., Ltd.	KT M mobile Co., Ltd.	KT M mobile Co., Ltd.
Total assets	₩ 129,011	₩ 135,917	₩ 146,334
Type of Business	Special category telecommunications operator and sales of communication device
Total liabilities	₩ 27,281	30,603	35,335
Location	Korea
Operating revenues	₩ 163,472	₩ 161,720	172,674
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (3,617)	₩ (5,580)	₩ (10,085)
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.
Total assets	₩ 115,627	₩ 73,463	₩ 74,580
Type of Business	Technology business finance
Total liabilities	₩ 93,695	56,212	58,040
Location	Korea
Operating revenues	₩ 47,801	₩ 13,375	8,095
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 4,680	₩ 847	₩ 247
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
Location	Korea
Controlling percentage ownership	70.40%	100.00%
Closing month	December
Next Connect PFV [member]
Disclosure of subsidiaries [line items]
Subsidiary	Next Connect PFV	Next connect PFV	Next connect PFV
Total assets	₩ 394,268	₩ 385,412	₩ 385,769
Type of Business	Residential building development and supply
Total liabilities	₩ 37,271	24,275	34,370
Location	Korea
Operating revenues	₩ 26	₩ 1,590	143
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (7,101)	₩ (5,898)	₩ (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	₩ 114,768	₩ 132,461	₩ 144,129
Type of Business	Network installation and management
Total liabilities	₩ 191,781	183,164	162,801
Location	Rwanda
Operating revenues	₩ 17,870	₩ 18,013	15,150
Controlling percentage ownership	51.00%	51.00%
Profit (loss) for the year	₩ (34,610)	₩ (31,662)	₩ (29,238)
Closing month	December
AOS Ltd. [member]
Disclosure of subsidiaries [line items]
Subsidiary	AOS Ltd.	AOS Ltd.	AOS Ltd.
Total assets	₩ 11,812	₩ 12,337	₩ 14,018
Type of Business	System integration and maintenance
Total liabilities	₩ 3,875	3,993	4,952
Location	Rwanda
Operating revenues	₩ 5,719	₩ 6,982	6,300
Controlling percentage ownership	51.00%	51.00%
Profit (loss) for the year	₩ 296	₩ (591)	₩ (680)
Closing month	December
KT Belgium [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Belgium	KT Belgium	KT Belgium
Total assets	₩ 87,608	₩ 93,321	₩ 90,172
Type of Business	Foreign investment business
Total liabilities		11	1
Location	Belgium
Operating revenues		₩ (81)	29
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (81)	₩ (64)	₩ (43)
Closing month	December
KT ORS Belgium [member]
Disclosure of subsidiaries [line items]
Subsidiary		KT ORS Belgium	KT ORS Belgium
Total assets		₩ 6,913	₩ 6,709
Total liabilities		14	5
Profit (loss) for the year		₩ (43)	₩ (46)
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	₩ 2,694	₩ 1,851	₩ 1,326
Type of Business	Foreign telecommunication business
Total liabilities	₩ 2,622	2,858	2,910
Location	Japan
Operating revenues	₩ 1,853	₩ 2,891	1,965
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 1	₩ 651	₩ (126)
Closing month	December
KBTO sp.zo.o. [member]
Disclosure of subsidiaries [line items]
Subsidiary	KBTO sp.z o.o.	KBTO sp.zo.o.	KBTO sp.zo.o.
Total assets	₩ 438	₩ 1,767	₩ 1,364
Type of Business	Electronic communication business
Total liabilities	₩ 117	245	217
Location	Poland
Operating revenues	₩ 490	₩ 519	202
Controlling percentage ownership	97.40%	97.20%
Profit (loss) for the year	₩ (2,823)	₩ (3,457)	₩ (3,771)
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	₩ 381	₩ 879	₩ 661
Type of Business	Foreign telecommunication business
Total liabilities	₩ 21	39	22
Location	China
Operating revenues	₩ 618	₩ 844	681
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (492)	₩ 192	₩ 10
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	₩ 29,585	₩ 31,003	₩ 31,693
Type of Business	Super iMax and East Telecom management
Total liabilities	₩ 10,109	50	41
Location	Netherlands
Operating revenues		₩ 26,782	191
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 6,061	₩ (242)	₩ 105
Closing month	December
Super iMax LLC [member]
Disclosure of subsidiaries [line items]
Subsidiary		Super iMax LLC	Super iMax LLC
Total assets		₩ 3,568	₩ 4,150
Total liabilities		5,304	4,528
Operating revenues		4,604	4,845
Profit (loss) for the year		₩ (631)	₩ (424)
East Telecom LLC [member]
Disclosure of subsidiaries [line items]
Subsidiary	East Telecom LLC	East Telecom LLC	East Telecom LLC1
Total assets		₩ 20,857	₩ 16,590
Type of Business	Fixed line telecommunication business
Total liabilities		16,302	14,263
Location	Uzbekistan
Operating revenues		₩ 17,186	15,087
Controlling percentage ownership	91.60%	91.00%
Profit (loss) for the year		₩ 2,140	₩ 2,639
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	₩ 4,498	₩ 4,611	₩ 4,218
Type of Business	Foreign telecommunication business
Total liabilities	₩ 125	537	832
Location	USA
Operating revenues	₩ 6,808	₩ 6,808	7,554
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 712	₩ 572	₩ 350
Closing month	December
PT. KT Indonesia [member]
Disclosure of subsidiaries [line items]
Subsidiary		PT. KT Indonesia	PT. KT Indonesia
Total assets		₩ 8	₩ 8
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 Hong Kong Telecommunications Co., Ltd.	KT Hongkong Telecommunications Co., Ltd.	KT Hongkong Telecommunications Co., Ltd.
Total assets	₩ 6,159	₩ 5,126	₩ 3,616
Type of Business	Fixed line communication business
Total liabilities	₩ 2,800	2,923	2,143
Location	Hong Kong
Operating revenues	₩ 16,386	₩ 13,321	9,990
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ 1,308	₩ 586	₩ 351
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 LLC
Type of Business	Fixed line internet business
Location	Uzbekistan
Controlling percentage ownership	100.00%	100.00%
Closing month	December
Nasmedia Thailand Co Ltd [member]
Disclosure of subsidiaries [line items]
Subsidiary	Nasmedia Thailand Co., Ltd.
Type of Business	Internet advertising solution provider
Location	Thailand
Controlling percentage ownership	99.90%	99.90%
Closing month	December
KT Huimangjieum [member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Huimangjieum	KT Huimangjieum
Total assets	₩ 3,720	₩ 2,129
Type of Business	Manufacturing
Total liabilities	₩ 2,787	1,019
Location	Korea
Operating revenues	₩ 5,239	₩ 1,027
Controlling percentage ownership	100.00%	100.00%
Profit (loss) for the year	₩ (13)	₩ (390)
Closing month	December
GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co. [member]
Disclosure of subsidiaries [line items]
Subsidiary	GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.	GE Premier 1st Corporate Restructuring Real Estate Investment Trust Co.
Total assets	₩ 5,703	₩ 6,285
Type of Business	Residential building investment and rent
Total liabilities	₩ 1,165	1,139
Location	Korea
Operating revenues	₩ 333	₩ 176
Controlling percentage ownership	68.10%	63.50%
Profit (loss) for the year	₩ 83	₩ 70
Closing month	December
K-REALTY RENTAL HOUSING REIT 3 [member]
Disclosure of subsidiaries [line items]
Subsidiary	K-REALTY RENTAL HOUSING REIT 3	K-REALTY RENTAL HOUSING REIT 3
Total assets		₩ 300
Type of Business	Residential building
Location	Korea
Controlling percentage ownership	88.60%	100.00%
Closing month	December
GENIE Music Corporation(KT Music Corporation) [member]
Disclosure of subsidiaries [line items]
Subsidiary	GENIE Music Corporation (KT Music Corporation)
Storywiz Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	Storywiz Co., Ltd
Total assets	₩ 21,594
Type of Business	Content and software development and supply
Total liabilities	₩ 10,065
Location	Korea
Operating revenues	₩ 19,209
Controlling percentage ownership	100.00%
Profit (loss) for the year	₩ (1,954)
Closing month	December
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member]
Disclosure of subsidiaries [line items]
Subsidiary	KT Engineering Co., Ltd. (KT ENGCORE Co., Ltd.)
Total assets	₩ 138,220
Type of Business	Telecommunication facility construction and maintenance
Total liabilities	₩ 102,963
Location	Korea
Operating revenues	₩ 346,040
Controlling percentage ownership	100.00%
Profit (loss) for the year	₩ (8,461)
Closing month	December

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Significant Accounting Policies - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)
Disclosure of significant accounting policies [line items]
Borrowing	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
Notional amount		$ 284,000,000	$ 519,598,989
Derecognition of financial liabilities, percent	10.00%
Bottom of range [member]
Disclosure of significant accounting policies [line items]
Useful lives of investment property, excluding land depreciated cost model	10 years
Top of range [member]
Disclosure of significant accounting policies [line items]
Useful lives of investment property, excluding land depreciated cost model	40 years

XML

Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2020
Buildings [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 years
Buildings [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Structures [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	5 years
Structures [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Machinery and equipment (Telecommunications equipment and others) [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 years
Machinery and equipment (Telecommunications equipment and others) [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	40 years
Vehicles [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	4 years
Vehicles [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	6 years
Tools [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	4 years
Tools [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	6 years
Office equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	2 years
Office equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated Useful Life	6 years

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Significant Accounting Policies - Summary of Amortization of Intangible Assets With Limited Useful Life (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	3 years
Development costs [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 years
Development costs [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	6 years
Software [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	4 years
Software [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	6 years
Frequency usage rights [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 years
Frequency usage rights [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	10 years
Others [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	1 year
Others [member] | Top of range [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	50 years

XML

Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2018 KRW (₩)	Dec. 31, 2017 KRW (₩)
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	₩ 7,017,639			₩ 8,679,698
Borrowings	7,316,298	$ 284,000,000	$ 519,598,989	7,298,867
Other financial liabilities	263,169			150,079
Cash and cash equivalents	2,634,624			2,305,894	₩ 2,703,422	₩ 1,928,182
Trade and other receivables	6,095,042			7,004,725
Other financial assets	1,747,187			1,690,046
Loans and receivables [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	2,634,624			2,305,894
Trade and other receivables	4,976,423			5,748,459
Other financial assets	671,068			441,804
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	809,919			632,324
Derivative used for hedge [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	127,929			20,096
Other financial assets	7,684			58,576
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Other financial liabilities	2,682			38
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other payables	7,017,639			8,679,698
Borrowings	7,316,298			7,298,867
Other financial liabilities	132,558			129,945
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Trade and other receivables	1,118,619			1,256,266
Other financial assets	₩ 258,516			₩ 557,342

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Interest income	₩ 270,571	₩ 282,704	₩ 244,796
Interest expense	(263,579)	(278,427)	(296,874)
Total		214,063	(116,643)
Gain (loss) on valuation	40,822	15,429	(5)
Other comprehensive income (loss) for the year	23,255	172,338	(54,628)
Reclassified to profit or loss from other comprehensive income for the year	111,431	(44,684)
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	799	2,664
Gain (loss) on valuation	119
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Gain on transactions	1,141		20,678
Gain (loss) on valuation	(161,003)	4,949	42,195
Other comprehensive income (loss) for the year	(81,671)	20,742	(2,810)
Reclassified to profit or loss from other comprehensive income for the year	107,786	(5,080)	(28,388)
Financial liabilities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest expense	(220,945)	(223,974)	(296,894)
Loss on repayment			(15)
Gain (loss) foreign currency transaction	(10,717)	(20,958)	(30,956)
Gain (loss) on foreign currency translation	141,849	(75,502)	(66,050)
Total	5,481
Financial assets at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	55,742	79,838	93,233
Gain (loss) foreign currency transaction	(19,244)	32,293	19,396
Gain (loss) on foreign currency translation	(3,895)	(474)	(2,901)
Gain (loss) on disposal	138	(43)	44
Gain (loss) on valuation	(140,474)	(59,947)	(110,544)
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	6,548	5,634	9,194
Dividend income	4,379	1,096	1,207
Gain (loss) foreign currency transaction	(38)	(27)
Gain (loss) on disposal	(329)	5,115	1,713
Gain (loss) on valuation	59,044	4,334	10,768
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Interest income	227,736	217,355	163,390
Dividend income	56	2,312	1,704
Gain (loss) on disposal	(8,152)	(11,247)	(13,818)
Impairment loss		(304)	(2,416)
Other comprehensive income (loss) for the year	41,997	167,152	43,811
Derivative financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Gain on transactions	6,050	6,332	7,272
Gain (loss) on valuation	(2,707)	56,537	22,065
Other comprehensive income (loss) for the year	(2,373)	46,806	20,078
Reclassified to profit or loss from other comprehensive income for the year	₩ 3,645	(39,604)	(15,891)
Held-to-maturity financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Gain (loss) on valuation		₩ (1,936)	₩ (2,708)

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	₩ 270,571	₩ 282,704	₩ 244,796
Interest expense recognized as operating expense	263,579	278,427	296,874
Profit and loss from foreign currency transaction	17,493	24,596	17,175
Gain (loss) on valuation	40,822	15,429	(5)
BC Card Co., Ltd. [member]
Disclosure of detailed information about financial instruments [line items]
Interest income recognized as operating revenue	21,018	21,021	20,854
Interest expense recognized as operating expense	548	21	1,456
Profit and loss from foreign currency transaction	17,006	20,422	19,687
Operating expenses from foreign currency translation	5	0	56
Dividend income	₩ 2,250	₩ 1,598	₩ 2,059

XML

Cash and Cash Equivalents to Restricted Cash - Summary of Restricted Cash and Cash Equivalents (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents [abstract]
Deposit restricted for governmental project and others	₩ 28,414	₩ 21,290

XML

Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of financial assets [line items]
Trade receivables	₩ 3,056,130	₩ 3,150,395
Other receivables	1,846,341	2,708,301
Trade and other receivables, net	4,902,471	5,858,696
Trade receivables	853,953	827,146
Other receivables	396,816	354,652
Trade and other receivables, net	1,250,769	1,181,798
Gross carrying amount [member]
Disclosure of financial assets [line items]
Trade receivables	3,388,099	3,451,107
Other receivables	1,948,108	2,787,144
Trade and other receivables, net	5,336,207	6,238,251
Trade receivables	892,992	874,860
Other receivables	513,926	382,468
Trade and other receivables, net	1,406,918	1,257,328
Accumulated depreciation, amortisation and impairment [member]
Disclosure of financial assets [line items]
Trade receivables	(322,992)	(291,202)
Other receivables	(101,619)	(78,572)
Trade and other receivables, net	(424,611)	(369,774)
Trade receivables	(4,323)	(4,117)
Other receivables	(102,985)	(5,108)
Trade and other receivables, net	(107,308)	(9,225)
Present value discount [member]
Disclosure of financial assets [line items]
Trade receivables	(8,977)	(9,510)
Other receivables	(148)	(271)
Trade and other receivables, net	(9,125)	(9,781)
Trade receivables	(34,716)	(43,597)
Other receivables	(14,125)	(22,708)
Trade and other receivables, net	₩ (48,841)	₩ (66,305)

XML

Trade and Other Receivables - Summary of Changes in Summary of Changes in Provision for Impairment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	₩ 295,319	₩ 359,924
Provision	89,097	24,596
Write-off or transfer out	(60,598)	(90,513)
Changes in the scope of consolidation	3,211
Others	286	1,312
Ending balance	327,315	295,319
Other receivables [member]
Disclosure of financial assets [line items]
Beginning balance	83,680	93,822
Provision	50,860	35,597
Reversal	(890)	(475)
Write-off or transfer out	(25,067)	(44,108)
Changes in the scope of consolidation	87,614
Others	8,407	(1,156)
Ending balance	₩ 204,604	₩ 83,680

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Trade and Other Receivables - Summary of Other Receivables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial assets [line items]
Receivables	₩ 6,095,042	₩ 7,004,725
Other receivables [member]
Disclosure of financial assets [line items]
Loans	116,082	84,148
Receivables	1,699,608	2,540,315
Accrued income	6,901	8,630
Refundable deposits	350,180	352,293
Loans receivable	150,527	105,961
Finance lease receivables	64,047	39,726
Others	60,416	15,560
Less Provision for impairment	(204,604)	(83,680)	₩ (93,822)
Other receivables	₩ 2,243,157	₩ 3,062,953

XML

Trade and Other Receivables - Summary of Other Receivables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
BC Card Co., Ltd. [member]
Disclosure of financial assets [line items]
Settlement receivable included in other receivables	₩ 986,384	₩ 1,786,610

XML

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other financial assets
Financial assets at amortized cost	₩ 671,068	₩ 441,804
Financial assets at fair value through profit or loss	809,919	632,324
Financial assets at fair value through other comprehensive income	258,516	557,342
Derivative used for hedging	7,684	58,576
Less: Non-current	544,347	821,658
Current	1,202,840	868,388
Other financial liabilities
Financial liabilities at amortized cost	132,558	129,945
Financial liabilities at fair value through profit or loss	2,682	38
Derivatives used for hedging	127,929	20,096
Less: Non-current	(260,676)	(149,136)
Current Other financial assets	₩ 2,493	₩ 943

XML

Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Other financial assets	₩ 1,747,187	₩ 1,690,046
Korea software financial cooperative [member]
Disclosure of detailed information about financial instruments [line items]
Available-for-sale financial assets investment amount	5,491	1,849
Ustream Inc. [member]
Disclosure of detailed information about financial instruments [line items]
Proceeds from the disposal of Subsidiary	104,442	91,445
Money Market Wrap and Money Market Trust [member]
Disclosure of detailed information about financial instruments [line items]
Other financial assets	₩ 509,068	₩ 406,062

XML

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of financial assets [line items]
Equity Instruments	₩ 809,919	₩ 632,324
Less: non-current	(276,109)	(219,026)
Current	533,810	413,298
Equity Instruments Listed [member]
Disclosure of financial assets [line items]
Equity Instruments	46,449	232
Equity Instruments Unlisted [member]
Disclosure of financial assets [line items]
Equity Instruments	83,017	90,357
Debt securities [member]
Disclosure of financial assets [line items]
Equity Instruments	₩ 680,453	541,657
Derivatives held for trading [member]
Disclosure of financial assets [line items]
Equity Instruments		₩ 78

XML

Other Financial Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Ineffective portion recognized in profit or loss cash flow hedge valuation gain	₩ 2,711	₩ 4,181	₩ 263
Reclassified as accumulated other comprehensive income after tax	265,087
Retained earnings of attributable to owners	12,155,420	11,590,916
Disposal of investments in associates and joint ventures	24	₩ 16,930	₩ 7,832
Equity Instruments Listed [member]
Disclosure of detailed information about financial instruments [line items]
Retained earnings of attributable to owners	184,330
Disposal of investments in associates and joint ventures	₩ 350,777

XML

Other Financial Assets and Liabilities - Summary of Financial Assets at Fair Value Through Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 258,516	₩ 557,342
Less: non-current	(258,516)	(556,147)
Current
Equity Instruments Listed [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	6,216	6,738
Equity Instruments Unlisted [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	245,730	543,518
Debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Equity Instruments	₩ 6,570	₩ 7,086

XML

Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Assets, Total	₩ 7,684	₩ 58,576
Less: Assets, non-current	(2,111)	(28,304)
Assets, Current	5,573	30,272
Liabilities, Total	127,929	20,096
Less: Liabilities, non-current	(126,408)	(19,177)
Liabilities, Current	1,521	919
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Liabilities, Total	1,078	1,464
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total	7,684	55,569
Liabilities, Total	126,189	18,632
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Assets, Total		₩ 3,007
Liabilities, Total	₩ 662

XML

Other Financial Assets and Liabilities - Summary of Valuation Gains and Losses on Derivatives Contracts (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Valuation gain		₩ 77,275	₩ 66,305
Valuation loss	₩ 163,710	15,829	2,045
Other comprehensive income	(113,742)	91,521	21,651
Interest rate swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain			192
Valuation loss		45
Other comprehensive income	(567)	(963)	(488)
Currency swap [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain		72,417	58,912
Valuation loss	161,661	15,784	2,045
Other comprehensive income	(113,175)	87,626	22,139
Currency forwards [member]
Disclosure of detailed information about financial instruments [line items]
Valuation gain		4,858	₩ 7,201
Valuation loss	₩ 2,049
Other comprehensive income		₩ 4,858

XML

Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	₩ 2,643,046	₩ 2,673,253
Changes in fair value to calculate the ineffective portion of hedges	151,817	(60,696)
Cash flow hedge reserves	19,779	(7,609)
USD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	1,924,576	1,822,477
Changes in fair value to calculate the ineffective portion of hedges	133,978	(45,855)
Cash flow hedge reserves	19,641	(5,214)
JPY
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	484,960	850,776
Changes in fair value to calculate the ineffective portion of hedges	4,228	(14,841)
Cash flow hedge reserves	(2,569)	₩ (2,395)
SGD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	233,510
Changes in fair value to calculate the ineffective portion of hedges	13,611
Cash flow hedge reserves	₩ 2,707

XML

Other Financial Assets and Liabilities - Summary of Hedging instruments (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about hedging instruments [line items]
Contract amount	₩ 2,771,700	₩ 2,616,123
Assets	7,684	58,576
Liabilities	127,929	20,096
Changes in fair value to calculate the ineffective portion of hedges	(154,528)	64,876
USD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	1,768,912	1,574,068
Contract amount	2,037,568	1,788,831
Assets	2,111	30,175
Liabilities	100,623	10,692
Changes in fair value to calculate the ineffective portion of hedges	(136,852)	49,480
JPY
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	46,000,000	80,000,000
Contract amount	488,924	827,292
Assets	5,573	28,401
Liabilities	13,839	9,404
Changes in fair value to calculate the ineffective portion of hedges	(4,065)	₩ 15,396
SGD
Disclosure of detailed information about hedging instruments [line items]
Foreign currency	284,000
Contract amount	245,208
Liabilities	13,467
Changes in fair value to calculate the ineffective portion of hedges	₩ (13,611)

XML

Other Financial Assets and Liabilities - Summary of Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Financial liabilities at fair value through profit or loss
Derivative liabilities held for trading	₩ 45	₩ 38
Conversion Rights and Redemption Rights	2,637
Total	₩ 2,682	₩ 38

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	₩ 45	₩ 38
Conversion Rights and Redemption Rights	2,637
Total	2,682	38
Valuation gain on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	10	78
Conversion Rights and Redemption Rights	162
Total	172	78
Valuation loss on financial liabilities [member]
Disclosure of financial liabilities [line items]
Derivative liabilities held for trading	53	2,014	₩ 2,707
Total	₩ 53	₩ 2,014	₩ 2,707

XML

Inventories - Summary of Inventories Net (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of inventories [line items]
Inventories	₩ 534,636	₩ 791,677
Merchandise [member]
Disclosure of inventories [line items]
Inventories	517,632	661,253
Others [member]
Disclosure of inventories [line items]
Inventories	17,004	130,424
Gross carrying amount [member]
Disclosure of inventories [line items]
Inventories	667,860	936,115
Gross carrying amount [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	650,856	805,691
Gross carrying amount [member] | Others [member]
Disclosure of inventories [line items]
Inventories	17,004	130,424
Valuation allowance [member]
Disclosure of inventories [line items]
Inventories	(133,224)	(144,438)
Valuation allowance [member] | Merchandise [member]
Disclosure of inventories [line items]
Inventories	₩ (133,224)	₩ (144,438)

XML

Inventories - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Classes of current inventories [abstract]
Inventories recognised as expense	₩ 3,938,842	₩ 3,905,630	₩ 3,926,199
Valuation loss and reversal of valuation loss	₩ 11,214	₩ 30,857	₩ 55,288

XML

Other Assets and Liabilities - Summary of Other Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Other assets
Advance payments		₩ 168,302	₩ 179,475
Prepaid expenses		66,578	84,768
Contract Cost	[1]	1,804,948	1,849,243
Contract assets	[1]	586,438	557,041
Others		18,747	14,243
Less: Non-current		(768,661)	(685,488)
Current		1,876,352	1,999,282
Other liabilities
Advances received		328,491	333,342
Withholdings		105,415	99,844
Unearned revenue		29,593	65,228
Lease liabilities		1,143,640	1,211,352
Contract liabilities	[1]	384,133	365,610
Others		21,597	23,298
Less: Non-current		(909,570)	(1,030,117)
Current		₩ 1,103,299	₩ 1,068,557

[1] The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

XML

Assets Held for Sale - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Assets Held For Sale [Line Items]
Proceeds from Assets held for Sale	₩ 83,241	₩ 28,834	₩ 9,842
Non-current assets held for sale [member]
Disclosure Of Assets Held For Sale [Line Items]
Impairment loss	0
Proceeds from Assets held for Sale	₩ 82,865

XML

Assets Held for Sale - Summary of Assets Held for Sale (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [line items]
Non-current assets held for sale	₩ 1,198
Land [member]
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [line items]
Non-current assets held for sale	172
Buildings And Other [Member]
Noncurrent assets or disposal groups classified as held for sale or as held for distribution to owners [line items]
Non-current assets held for sale	₩ 1,026

XML

Property and Equipment - Summary of Changes in Property and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	₩ 13,785,299	₩ 13,068,257
Changes in accounting policy		(210,028)
Acquisition and capital expenditure	3,151,849	3,693,428
Disposal and termination	(78,936)	(87,493)
Depreciation	(2,570,775)	(2,502,576)
Impairment	(79,775)	(43,260)
Transfer in (out)	(44,860)	(61,109)
Transfer to investment properties	(2,056)	(41,335)
Transfer assets held-for-sale		(90,451)
Changes in scope of consolidation	818
Others	44,555	59,866
Ending, net	14,206,119	13,785,299
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	45,655,456	44,289,629
Ending, net	47,586,332	45,655,456
Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(31,870,157)	(31,221,372)
Ending, net	(33,380,213)	(31,870,157)
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,262,181	1,281,187
Acquisition and capital expenditure	25,156	338
Disposal and termination	(1,756)	(1,352)
Transfer in (out)	53,238	126,066
Transfer to investment properties	6,792	(33,254)
Transfer assets held-for-sale		(89,330)
Changes in scope of consolidation	56
Others	(11,040)	(21,474)
Ending, net	1,334,627	1,262,181
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,262,313	1,281,319
Ending, net	1,334,759	1,262,313
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 and structures [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	2,162,064	2,007,685
Changes in accounting policy		(149)
Acquisition and capital expenditure	7,249	4,523
Disposal and termination	(3,367)	(4,213)
Depreciation	(135,646)	(134,350)
Impairment	(36)	(32)
Transfer in (out)	283,937	270,980
Transfer to investment properties	(8,848)	(8,081)
Transfer assets held-for-sale		(1,121)
Changes in scope of consolidation	494
Others	2,175	26,822
Ending, net	2,308,022	2,162,064
Buildings and structures [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	4,125,229	3,873,074
Ending, net	4,402,691	4,125,229
Buildings and structures [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,963,165)	(1,865,389)
Ending, net	(2,094,669)	(1,963,165)
Machinery and equipment1 [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	9,093,251	8,475,016
Changes in accounting policy		(12,947)
Acquisition and capital expenditure	112,085	205,359
Disposal and termination	(69,401)	(76,457)
Depreciation	(2,343,965)	(2,278,286)
Impairment	(35,271)	(41,450)
Transfer in (out)	2,489,138	2,742,671
Changes in scope of consolidation	225
Others	68,921	79,345
Ending, net	9,314,983	9,093,251
Machinery and equipment1 [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	37,654,635	36,327,007
Ending, net	39,182,265	37,654,635
Machinery and equipment1 [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(28,561,384)	(27,851,991)
Ending, net	(29,867,282)	(28,561,384)
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	267,535	478,381
Changes in accounting policy		(196,932)
Acquisition and capital expenditure	47,669	64,072
Disposal and termination	(3,385)	(4,109)
Depreciation	(91,164)	(89,940)
Impairment	(44,468)	(1,751)
Transfer in (out)	28,024	16,218
Transfer to investment properties		0
Changes in scope of consolidation	43
Others	1,398	1,596
Ending, net	205,652	267,535
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,612,108	1,981,646
Ending, net	1,619,822	1,612,108
Others [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(1,344,573)	(1,503,265)
Ending, net	(1,414,170)	(1,344,573)
Construction-in-progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,000,268	825,988
Acquisition and capital expenditure	2,959,690	3,419,136
Disposal and termination	(1,027)	(1,362)
Impairment	0	(27)
Transfer in (out)	(2,899,197)	(3,217,044)
Others	(16,899)	(26,423)
Ending, net	1,042,835	1,000,268
Construction-in-progress [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	1,001,171	826,583
Ending, net	1,046,795	1,001,171
Construction-in-progress [member] | Accumulated depreciation, amortisation and impairment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning, net	(903)	(595)
Ending, net	₩ (3,960)	₩ (903)

XML

Property and Equipment - Summary of the Details of Property and Equipment Provided (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 7,316,298	₩ 7,298,867	$ 284,000,000	$ 519,598,989
Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	11,644	17,097
Secured amount	₩ 15,502	₩ 18,705
Related line item	Borrowings	Borrowings
Related amount	₩ 3,072	₩ 4,347
Secured party	Industrial Bank of Korea, Korea Development Bank	Industrial Bank of Korea, Korea Development Bank , K Bank, Inc.
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	₩ 4,142	₩ 45,851
Secured amount	₩ 249	₩ 41,681
Related line item	Deposits	Borrowings
Related amount	₩ 249	₩ 3,473
Secured party	K Bank, Inc.	Shinhan Bank

XML

Property and Equipment - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]
Borrowing cost capitalized	₩ 8,452	₩ 6,360
Interest rate of capitalized borrowing cost	2.36%	2.63%

XML

Investment Properties - Summary of Investment Properties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about investment property [line items]
Beginning balance	₩ 1,387,430	₩ 1,091,084
Changes in accounting policy		46,666
Acquisition	53,062	254,066
Disposal and termination	(1,779)	(1,693)
Depreciation	(64,531)	(65,178)
Transfer from (to) property and equipment	2,056	41,335
Transfer and others	(7,785)	21,150
Ending balance	1,368,453	1,387,430
Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,880,584	1,518,917
Ending balance	1,927,776	1,880,584
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(493,154)	(427,833)
Ending balance	(559,323)	(493,154)
Land [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	553,596	348,848
Acquisition	11,723	148,511
Disposal and termination	(1,536)	(285)
Transfer from (to) property and equipment	(6,792)	33,254
Transfer and others	(18,656)	23,268
Ending balance	538,335	553,596
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	555,164	350,417
Ending balance	539,903	555,164
Land [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(1,568)	(1,569)
Ending balance	(1,568)	(1,568)
Buildings [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	831,932	742,115
Changes in accounting policy		46,666
Acquisition	7,096	103,774
Disposal and termination	(243)	(1,408)
Depreciation	(64,531)	(65,178)
Transfer from (to) property and equipment	8,848	8,081
Transfer and others	469	(2,118)
Ending balance	783,571	831,932
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,323,518	1,168,379
Ending balance	1,341,326	1,323,518
Buildings [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	(491,586)	(426,264)
Ending balance	(557,755)	(491,586)
Investment property, construction-in-progress [Member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,902	121
Acquisition	34,243	1,781
Transfer and others	10,402
Ending balance	46,547	1,902
Investment property, construction-in-progress [Member] | Gross carrying amount [member]
Disclosure of detailed information about investment property [line items]
Beginning balance	1,902	121
Ending balance	₩ 46,547	₩ 1,902

XML

Investment Properties - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about investment property [line items]
Fair value of investment properties	₩ 2,645,482	₩ 2,304,583
Rental income from investment properties	203,763	₩ 198,636
Future minimum lease fee	221,932
Less than 1 year [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	50,769
1-5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	92,728
More than 5 years [member]
Disclosure of detailed information about investment property [line items]
Future minimum lease fee	₩ 78,435

XML

Investment Properties - Summary of Investment Properties Provided as Collateral (Detail) - Land and buildings [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Deposits 1 [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	₩ 790,414	₩ 854,874
Secured amount	₩ 62,968	₩ 62,896
Related account	Deposits	Deposits
Related amount	₩ 56,247	₩ 56,831
Borrowings [member]
Disclosure of detailed information about investment property [line items]
Carrying amount	2,861	1,915
Secured amount	₩ 3,434	₩ 3,044
Related account	Borrowings	Borrowings
Related amount	₩ 2,928	₩ 1,903

XML

Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]
Beginning, net	₩ 2,834,037	₩ 3,407,124
Changes in accounting policy		(26,207)
Acquisition and capital expenditure	165,630	178,694
Disposal and termination	(13,820)	(15,679)
Amortization	(628,154)	(660,705)	₩ (629,526)
Impairment	(211,637)	(61,898)
Changes in scope of consolidation	4,342
Others	10,860	12,708
Ending, net	2,161,258	2,834,037	3,407,124
Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	7,996,482	8,064,270
Ending, net	7,898,325	7,996,482	8,064,270
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(5,162,445)	(4,657,146)
Ending, net	(5,737,067)	(5,162,445)	(4,657,146)
Goodwill [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	235,570	236,058
Impairment		(605)
Others	(5,485)	117
Ending, net	230,085	235,570	236,058
Goodwill [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	541,596	542,074
Ending, net	536,093	541,596	542,074
Goodwill [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(306,026)	(306,016)
Ending, net	(306,008)	(306,026)	(306,016)
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	272,634	335,110
Acquisition and capital expenditure	26,990	47,903
Disposal and termination	(1,849)	(3,019)
Amortization	(104,938)	(115,839)
Impairment		(1,333)
Changes in scope of consolidation	575
Others	87,587	9,812
Ending, net	280,999	272,634	335,110
Development costs [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,661,372	1,680,372
Ending, net	1,767,422	1,661,372	1,680,372
Development costs [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,388,738)	(1,345,262)
Ending, net	(1,486,423)	(1,388,738)	(1,345,262)
Software [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	137,381	65,944
Acquisition and capital expenditure	37,077	30,965
Disposal and termination	(105)	(1,267)
Amortization	(54,191)	(68,222)
Impairment	(1,776)	(1,807)
Changes in scope of consolidation	77
Others	27,537	11,768
Ending, net	146,000	137,381	65,944
Software [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	978,139	947,312
Ending, net	1,053,980	978,139	947,312
Software [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(840,758)	(781,368)
Ending, net	(907,980)	(840,758)	(781,368)
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,753,941	2,156,500
Disposal and termination	0	(284)
Amortization	(399,348)	(399,382)
Impairment	(193,194)	(3,035)
Others	(736)	142
Ending, net	1,160,663	1,753,941	2,156,500
Frequency usage rights [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	3,622,327	3,641,231
Ending, net	3,373,095	3,622,327	3,641,231
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(1,868,386)	(1,484,731)
Ending, net	(2,212,432)	(1,868,386)	(1,484,731)
Others [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	434,511	513,512
Changes in accounting policy		(26,207)
Acquisition and capital expenditure	101,563	99,826
Disposal and termination	(11,866)	(11,109)
Amortization	(69,677)	(77,262)
Impairment	(16,667)	(55,118)
Changes in scope of consolidation	3,690
Others	(98,043)	(9,131)
Ending, net	343,511	434,511	513,512
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	1,193,048	1,253,281
Ending, net	1,167,735	1,193,048	1,253,281
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about intangible assets [line items]
Beginning, net	(758,537)	(739,769)
Ending, net	₩ (824,224)	₩ (758,537)	₩ (739,769)

XML

Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about intangible assets [abstract]
Indefinite useful life	₩ 221,099	₩ 203,240

XML

Intangible Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]
Acquisition cost	₩ 201,461
Remaining useful life of Frequency usage rights	3 years
Carrying amount of the 28 gegahertz frequency usage [member]
Disclosure of detailed information about intangible assets [line items]
Impairment loss	₩ 190,929
KT Skylife Co Ltd [member] | Intangible assets with indefinite useful life [member]
Disclosure of detailed information about intangible assets [line items]
Impairment loss	₩ 0
Individual assets or cash-generating units [member]
Disclosure of detailed information about intangible assets [line items]
Impairment loss		₩ 38,519
Discount rate		7.30%

XML

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)
Disclosure of detailed information about intangible assets [line items]
Goodwill	₩ 230,085
Mobile services [member] | ICT [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	50,214
PlayD Co., Ltd. (N Search Marketing Co., Ltd.) [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	₩ 15,417

XML

Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Parenthetical) (Detail) - KRW (₩)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate		0.00%
Expected revenue growth rate		(1.25%)
Mobile services [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0.00%
Discount rate	7.43%
Impairment loss on goodwill	₩ 0	₩ 0
Description of calculation of recoverable amount	The Group performed its impairment assessment for long-lived assets attributed to the Information and Communication Technology (“ICT”) reporting segment, which includes the Cash-Generating Units of Mobile, Fixed line, and Corporate Services (the “CGUs”). The Group compared the carrying value of each CGU to the estimated recoverable amount. The recoverable amounts of ICT reporting segment are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.42% ~ 3.84% 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 rate 6.21%. Accordingly, the Group did not recognize an impairment loss on ICT reporting segment for the years ended December 31, 2018, 2019 and 2020.
Mobile services [member] | Bottom of range [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Expected revenue growth rate	0.22%
Mobile services [member] | Top of range [member] | ICT [member]
Disclosure of detailed information about intangible assets [line items]
Expected revenue growth rate	4.93%
Marketing [member] | Mobile services [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0.00%
Expected revenue growth rate	0.22%
Discount rate	7.43%
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 discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.42% 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 6.21% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on mobile business for the years ended December 31, 2018, 2019 and 2020.
Finance [member]
Disclosure of detailed information about intangible assets [line items]
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 discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 0.92% 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 7.75% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.
Finance [member] | BC Card Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	0.00%
Expected revenue growth rate	0.92%
Discount rate	7.75%
Impairment loss on goodwill	₩ 0	0
Others [member] | KT Telecop Co., Ltd. [member]
Disclosure of detailed information about intangible assets [line items]
Terminal growth rate	1.00%
Expected revenue growth rate	9.30%
Discount rate	9.78%
Impairment loss on goodwill	₩ 0	₩ 0
Description of calculation of recoverable amount	The recoverable amounts of KT Telecop Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal 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 average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 9.30% 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 9.78% used reflected specific risks relating to the relevant CGUs. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on KT Telecop Co., Ltd. for the years ended December 31, 2018, 2019 and 2020.

XML

Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Korea Information & Technology Fund [member]
Disclosure of associates [line items]
Percentage of ownership	33.30%	33.30%
Location	Korea
Date of financial statements	December 31	December 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	December 31	December 31
KT-CKP New Media Investment Fund [member]
Disclosure of associates [line items]
Percentage of ownership		49.70%
Location	Korea
Date of financial statements	December 31	December 31
K Bank Inc. [member]
Disclosure of associates [line items]
Percentage of ownership	34.00%	10.00%
Location	Korea
Date of financial statements	December 31	December 31
Hyundai Robotics Co., Ltd. [member]
Disclosure of associates [line items]
Percentage of ownership	10.00%
Location	Korea
Date of financial statements	December 31	December 31

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, 2020	Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	₩ 267,660	₩ 272,407
Acquisition (Disposal)	273,277	13,021
Share of net profit from associates and joint ventures	18,320	(3,252)
Others	(1,376)	(14,516)
Ending	557,881	267,660
Korea Information & Technology Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	163,975	148,255
Share of net profit from associates and joint ventures	12,205	17,956
Others	(6,025)	(2,236)
Ending	170,155	163,975
KT-SB Venture Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning		4,470
Acquisition (Disposal)		(4,470)
KT-CKP New Media Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	134	281
Acquisition (Disposal)	(134)	(174)
Share of net profit from associates and joint ventures		27
Ending		134
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Acquisition (Disposal)	50,000
Share of net profit from associates and joint ventures	(64)
Others	1,000
Ending	50,936
Others [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	44,293	56,785
Acquisition (Disposal)	28,400	(7,867)
Share of net profit from associates and joint ventures	34,298	7,241
Others	5,337	(11,866)
Ending	112,328	44,293
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	14,100	9,961
Acquisition (Disposal)		3,750
Share of net profit from associates and joint ventures	2,090	389
Ending	16,190	14,100
K Bank Inc. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	45,158	52,655
Acquisition (Disposal)	195,011	21,782
Share of net profit from associates and joint ventures	(30,209)	(28,865)
Others	(1,688)	(414)
Ending	₩ 208,272	₩ 45,158

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items]
Share gain from associates and joint ventures	₩ 18,041	₩ (3,304)	₩ (5,467)
KT Investment Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Share gain from associates and joint ventures	₩ 279	₩ 52	₩ 445

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	₩ 11,154,180	₩ 11,975,659
Non-current assets	22,508,365	22,656,555
Current liabilities	9,192,472	10,148,054
Non-current liabilities	8,918,640	9,343,476
Operating revenue	24,440,647	24,899,189	₩ 23,436,050
Profit (loss) for the year	746,256	695,868	719,412
Other comprehensive income(loss)	23,255	172,338	(54,628)
Total comprehensive income(loss)	769,511	868,206	₩ 664,784
Korea Information & Technology Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	107,652	113,233
Non-current assets	402,812	378,691
Operating revenue	54,473	70,577
Profit (loss) for the year	36,615	53,867
Other comprehensive income(loss)	9,647	6,132
Total comprehensive income(loss)	46,262	59,999
Dividends received from associates	9,241	4,280
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	32,379	28,200
Operating revenue	6,551	1,694
Profit (loss) for the year	4,179	779
Total comprehensive income(loss)	4,179	779
KT-CKP New Media Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets		3
Non-current assets		267
Operating revenue		56
Profit (loss) for the year		55
Total comprehensive income(loss)		55
K Bank Inc. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	4,255,620	2,480,065
Non-current assets	74,193	78,566
Current liabilities	3,752,838	2,350,375
Non-current liabilities	88,155	3,784
Operating revenue	80,301	92,720
Profit (loss) for the year	(105,374)	(100,773)
Other comprehensive income(loss)	(1,126)	(23)
Total comprehensive income(loss)	(106,500)	₩ (100,796)
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Current assets	315,886
Non-current assets	125,619
Current liabilities	80,615
Non-current liabilities	59,324
Operating revenue	195,311
Profit (loss) for the year	(642)
Other comprehensive income(loss)	11,573
Total comprehensive income(loss)	₩ 10,931

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, 2020	Dec. 31, 2019
Disclosure Of Associates And Joint Ventures [Line Items]
Book amount	₩ 557,881	₩ 267,660
K Bank Inc. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 488,819	₩ 204,472
Percentage of ownership	34.00%	10.00%
Share in net assets	₩ 166,198	₩ 45,158
Intercompany transaction and others	42,074
Book amount	208,272	45,158
Korea Information & Technology Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 510,464	₩ 491,924
Percentage of ownership	33.30%	33.30%
Share in net assets	₩ 170,155	₩ 163,975
Book amount	170,155	163,975
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 32,379	₩ 28,200
Percentage of ownership	50.00%	50.00%
Share in net assets	₩ 16,190	₩ 14,100
Book amount	16,190	14,100
KT-CKP New Media Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets		₩ 270
Percentage of ownership		49.70%
Share in net assets		₩ 134
Book amount		₩ 134
Hyundai Robotics Co., Ltd. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Net assets	₩ 301,566
Percentage of ownership	10.00%
Share in net assets	₩ 30,157
Intercompany transaction and others	20,779
Book amount	₩ 50,936

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, 2020	Dec. 31, 2019
K Bank Inc. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Percentage of non-voting convertible stock are excluded	12.10%	12.10%

XML

Investments in Associates and Joint Ventures - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of associates [abstract]
Loss from associates and joint ventures not recognized	₩ 992	₩ 6,124
Accumulated comprehensive loss of associates and joint ventures not recognized	₩ 8,228	₩ 12,599

XML

Trade and Other Payables - Summary of Trade and Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current liabilities
Trade payables	₩ 1,239,717	₩ 1,304,795
Other payables	4,970,382	6,292,683
Total	6,210,099	7,597,478
Non-current liabilities
Trade payables	1,528	1,733
Other payables	806,012	1,080,487
Total	₩ 807,540	₩ 1,082,220

XML

Trade and Other Payables - Summary of Other Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Trade and other payables [abstract]
Non-trade payables	₩ 3,841,227	₩ 5,275,224
Accrued expenses	933,978	987,624
Operating deposits	803,904	910,045
Others	197,285	200,277
Less: non-current	(806,012)	(1,080,487)
Current	₩ 4,970,382	₩ 6,292,683

XML

Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade and other payables [abstract]
Settlement payables related to credit card transaction	₩ 1,007,171	₩ 1,824,068

XML

Borrowings - Summary of Borrowings (Detail) ¥ in Thousands, ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 JPY (¥)
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 5, 2025
Annual interest rates	0.00%	0.00%	0.00%	0.00%
Less: Current portion	₩ (1,418,114)				₩ (1,185,725)
Borrowings	7,316,298	$ 284,000,000	$ 519,598,989		7,298,867
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 7,338,522
Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 7, 2034
Annual interest rates	6.50%	6.50%	6.50%	6.50%
Annual interest rates description	LIBOR(3M)+0.900
Annual interest rates adjustment rate	0.90%	0.90%	0.90%	0.90%
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%	2.50%
Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 7, 2022
Annual interest rates	2.63%	2.63%	2.63%	2.63%
Gross carrying amount [member] | Aug. 20, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 20, 2023
Gross carrying amount [member] | Aug. 20, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Aug. 20, 2020
Gross carrying amount [member] | Nov 01, 2024 [memebr]
Disclosure of detailed information about borrowings [line items]
Maturity	Nov. 1, 2024
Annual interest rates description	LIBOR(3M)+0.980
Annual interest rates adjustment rate	0.98%	0.98%	0.98%	0.98%
Gross carrying amount [member] | June 19, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 19, 2023
Annual interest rates description	SOR(6M)+0.500
Annual interest rates adjustment rate	0.50%	0.50%	0.50%	0.50%
Gross carrying amount [member] | Sept. 1, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 1, 2025
Annual interest rates	1.00%	1.00%	1.00%	1.00%
Gross carrying amount [member] | July 06, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 6, 2020
Gross carrying amount [member] | July 06, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 6, 2021
Annual interest rates	0.38%	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
Gross carrying amount [member] | July 19, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	July 19, 2022
Annual interest rates	0.22%	0.22%	0.22%	0.22%
Gross carrying amount [member] | July 19, 2024 [memeber]
Disclosure of detailed information about borrowings [line items]
Maturity	July 19, 2024
Annual interest rates	0.33%	0.33%	0.33%	0.33%
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%	4.71%
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%	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%	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%	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%	4.27%
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%	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%	3.17%
Gross carrying amount [member] | Sept. 16, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 16, 2020
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%	3.42%
Gross carrying amount [member] | June 26, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 26, 2024
Annual interest rates	3.70%	3.70%	3.70%	3.70%
Gross carrying amount [member] | Sept. 02, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 2, 2024
Annual interest rates	3.31%	3.31%	3.31%	3.31%
Gross carrying amount [member] | Sept. 02, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Sept. 2, 2034
Annual interest rates	3.55%	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
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%	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%	2.71%
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%	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%	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%	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%	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%	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%	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%	2.93%
Gross carrying amount [member] | Jan, 14, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 14, 2022
Annual interest rates	2.05%	2.05%	2.05%	2.05%
Gross carrying amount [member] | Jan, 15, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 15, 2024
Annual interest rates	2.09%	2.09%	2.09%	2.09%
Gross carrying amount [member] | Jan, 15, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 15, 2029
Annual interest rates	2.16%	2.16%	2.16%	2.16%
Gross carrying amount [member] | Jan, 14, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Jan. 14, 2039
Annual interest rates	2.21%	2.21%	2.21%	2.21%
Gross carrying amount [member] | Oct, 11, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2022
Annual interest rates	1.55%	1.55%	1.55%	1.55%
Gross carrying amount [member] | Oct, 11, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2024
Annual interest rates	1.58%	1.58%	1.58%	1.58%
Gross carrying amount [member] | Oct, 11, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2029
Annual interest rates	1.62%	1.62%	1.62%	1.62%
Gross carrying amount [member] | Oct, 11, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Oct. 11, 2039
Annual interest rates	1.67%	1.67%	1.67%	1.67%
Gross carrying amount [member] | June 16, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 16, 2023
Annual interest rates	1.17%	1.17%	1.17%	1.17%
Gross carrying amount [member] | June 17, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 17, 2025
Annual interest rates	1.43%	1.43%	1.43%	1.43%
Gross carrying amount [member] | June 17, 2030 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 17, 2030
Annual interest rates	1.61%	1.61%	1.61%	1.61%
Gross carrying amount [member] | June 15, 2040 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 15, 2040
Annual interest rates	1.71%	1.71%	1.71%	1.71%
Gross carrying amount [member] | June 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Maturity	June 23, 2023
Annual interest rates	1.51%	1.51%	1.51%	1.51%
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Less: Current portion	₩ (1,228,283)				(1,052,032)
Discount on bonds	(19,847)				(20,780)
Borrowings	5,714,340				5,972,554
Debentures [member] | Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	6,962,470				7,045,366
Debentures [member] | Gross carrying amount [member] | Sept. 07, 2034 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	108,800		$ 100,000,000		115,780	$ 100,000,000
Debentures [member] | Gross carrying amount [member] | July 18, 2026 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	435,200		400,000,000		463,120	400,000,000
Debentures [member] | Gross carrying amount [member] | Aug 07, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	435,200		400,000,000		463,120	400,000,000
Debentures [member] | Gross carrying amount [member] | Aug. 20, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	108,800		100,000,000		115,780	100,000,000
Debentures [member] | Gross carrying amount [member] | Aug. 20, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					231,560	200,000,000
Debentures [member] | Gross carrying amount [member] | Nov 01, 2024 [memebr]
Disclosure of detailed information about borrowings [line items]
Borrowings	380,800		350,000,000		405,230	$ 350,000,000
Debentures [member] | Gross carrying amount [member] | June 19, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	233,510	$ 284,000,000
Debentures [member] | Gross carrying amount [member] | Sept. 1, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	435,200		$ 400,000,000
Debentures [member] | Gross carrying amount [member] | July 06, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					42,539		¥ 4,000,000
Debentures [member] | Gross carrying amount [member] | July 06, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	168,682			¥ 16,000,000	170,155		16,000,000
Debentures [member] | Gross carrying amount [member] | Nov 13, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					319,041		30,000,000
Debentures [member] | Gross carrying amount [member] | July 19, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	312,061			29,600,000	314,787		29,600,000
Debentures [member] | Gross carrying amount [member] | July 19, 2024 [memeber]
Disclosure of detailed information about borrowings [line items]
Borrowings	4,217			¥ 400,000	4,254		¥ 400,000
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, 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, 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, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings					300,000
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, 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
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, 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				110,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	150,000				150,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2028 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	170,000				170,000
Debentures [member] | Gross carrying amount [member] | Jan. 30, 2038 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000				70,000
Debentures [member] | Gross carrying amount [member] | Jan, 14, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	220,000				220,000
Debentures [member] | Gross carrying amount [member] | Jan, 15, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	80,000				80,000
Debentures [member] | Gross carrying amount [member] | Jan, 15, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000				110,000
Debentures [member] | Gross carrying amount [member] | Jan, 14, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	90,000				90,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	340,000				340,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	100,000				100,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2029 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	50,000				50,000
Debentures [member] | Gross carrying amount [member] | Oct, 11, 2039 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	110,000				₩ 110,000
Debentures [member] | Gross carrying amount [member] | June 16, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	150,000
Debentures [member] | Gross carrying amount [member] | June 17, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	70,000
Debentures [member] | Gross carrying amount [member] | June 17, 2030 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	20,000
Debentures [member] | Gross carrying amount [member] | June 15, 2040 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	60,000
Debentures [member] | Gross carrying amount [member] | June 23, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 100,000

XML

Borrowings - Summary of Borrowings (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
Libor rate	0.238%	0.238%	0.238%
SOR rate	0.185%	0.185%	0.185%
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 Korean Won and Foreign Currency Borrowings (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Maturity	Jun. 5, 2025
Annual interest rates	0.00%	0.00%	0.00%
Borrowings	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
The 1st CB(Private) Jun. 5, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	5,623
Redemption premium	2,267
Bond discount issuance	(4,644)
The 1st CB(Private) Jun. 5, 2020 [member] | The 1st CB(Private) Jun. 5, 2025 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 8,000

XML

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]
Interest rate	0.00%
Maturity yield	5.00%
Storywiz Co Ltd [Member]
Disclosure of detailed information about borrowings [line items]
Appraisal period of common stock conversion to debt	(appraisal period: June 5, 2021~ May 4, 2025)

XML

Borrowings - Summary of Short-term Borrowing (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0.00%
Short-term borrowings	₩ 95,789	₩ 83,500
NongHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	40,189	15,000
Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	22,500	57,500
Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	10,000	10,000
SooHyup Bank [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings		₩ 1,000
Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	1,900
Industrial Bank Of Korea [member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	200
Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Short-term borrowings	₩ 11,000
Short-term borrowings [member] | NongHyup Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.74%
Short-term borrowings [member] | NongHyup Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.36%
Short-term borrowings [member] | Shinhan Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.431%
Annual interest rates description	CD91+1.431%
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.46%
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.96%
Short-term borrowings [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.34%
Short-term borrowings [member] | Woori Bank [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.57%
Short-term borrowings [member] | Industrial Bank Of Korea [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.74%
Short-term borrowings [member] | Hana Bank [Member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	4.20%

XML

Borrowings - Summary of Long-term Borrowings (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2019 USD ($)
Disclosure of detailed information about borrowings [line items]
Annual interest rates	0.00%	0.00%	0.00%
Borrowings	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
Total	5,898,184			6,113,142
Shinhan Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings			25,918,000	30,008	$ 25,918,000
Shinhan Bank [member] | Kookmin Bank and other [member]
Disclosure of detailed information about borrowings [line items]
Borrowings | $					87,940,000
NongHyup Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings				79
Other Financial Instruments [member] | Kookmin Bank and other [member]
Disclosure of detailed information about borrowings [line items]
Borrowings			$ 48,855,000	950
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	272,263			190,780
Less: Current portion	(94,042)			(50,192)
Total	178,221			140,588
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%	1.50%
Borrowings	₩ 2,961			3,454
Long-term borrowings [member] | Industrial Bank of Korea [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	2.98%	2.98%	2.98%
Borrowings	₩ 6,000			6,000
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.94%	1.94%	1.94%
Borrowings	₩ 5,000			5,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 1 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+1.650
Annual interest rates adjustment rate	1.65%	1.65%	1.65%
Borrowings	₩ 9,694		$ 8,910,000	3,473	$ 3,000,000
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+2.130
Annual interest rates adjustment rate	2.13%	2.13%	2.13%
Borrowings	₩ 27,200		$ 25,000,000
Long-term borrowings [member] | Shinhan Bank [member] | Facility loans [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+1.340
Annual interest rates adjustment rate	1.34%	1.34%	1.34%
Borrowings	₩ 28,199
Long-term borrowings [member] | CA-CIB [member] | Long-term CP [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	1.26%	1.26%	1.26%
Borrowings	₩ 100,000
Long-term borrowings [member] | NongHyup Bank [member] | General loans [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 54
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%	2.00%
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%	3.02%
Borrowings	₩ 10,000			10,000
Long-term borrowings [member] | Korea Development Bank [member] | General Loans 1 [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates	3.31%	3.31%	3.31%
Long-term borrowings [member] | Other Financial Instruments [member] | Redeemable convertible preferred stock [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 53,155			₩ 101,816
Long-term borrowings [member] | Other Financial Instruments [member] | Kookmin Bank and other [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rates description	LIBOR(3M)+1.850
Annual interest rates adjustment rate	1.85%	1.85%	1.85%

XML

Borrowings - Summary of Long-term Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020
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	0.238%
Vessel facility loans [member] | Kookmin Bank [member]
Disclosure of detailed information about borrowings [line items]
LIBOR rate	0.238%

XML

Borrowings - Summary of Repayment of Borrowings Including the Current Liabilities (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	5,714,340			5,972,554
Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	272,263			190,780
Gross carrying amount [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	7,338,522
Gross carrying amount [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	6,962,470			₩ 7,045,366
Gross carrying amount [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	4,348,000
Gross carrying amount [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,622,470
Gross carrying amount [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	368,052
Gross carrying amount [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	249,804
Gross carrying amount [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	118,248
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,418,513
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,228,682
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [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, 2020 - Dec 31, 2020 [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	168,682
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	189,831
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	147,307
Gross carrying amount [member] | Jan 1, 2020 - Dec 31, 2020 [member] | Long-term borrowings [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	42,524
Gross carrying amount [member] | Jan 1, 2021 - Dec 31, 2021 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,346,609
Gross carrying amount [member] | Jan 1, 2021 - Dec 31, 2021 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,307,261
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	560,000
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	747,261
Gross carrying amount [member] | Jan 1, 2021 - Dec 31, 2021 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	39,348
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	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	38,830
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,069,704
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	932,310
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	590,000
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	342,310
Gross carrying amount [member] | Jan 1, 2022 - Dec 31, 2022 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	137,394
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	100,500
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	36,894
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	845,510
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	845,017
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	460,000
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	385,017
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	493
Gross carrying amount [member] | Jan 1, 2023 - Dec 31, 2023 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	493
Gross carrying amount [member] | After 2024 [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,658,186
Gross carrying amount [member] | After 2024 [member] | Debentures [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	2,657,200
Gross carrying amount [member] | After 2024 [member] | Debentures [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	1,678,000
Gross carrying amount [member] | After 2024 [member] | Debentures [member] | In foreign currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	979,200
Gross carrying amount [member] | After 2024 [member] | Long-term borrowings [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	986
Gross carrying amount [member] | After 2024 [member] | Long-term borrowings [member] | In local currency [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	₩ 986

XML

Provisions - Summary of Changes in Provisions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of other provisions [line items]
Beginning balance	₩ 254,162	₩ 281,876
Increase (Transfer)	33,004	66,603
Usage	(9,204)	(56,885)
Reversal	(27,092)	(37,432)
Change in scope of consolidation	1,322
Ending balance	252,192	254,162
Current	165,990	175,612
Non-current	86,202	78,550
Litigation [member]
Disclosure of other provisions [line items]
Beginning balance	64,241	58,760
Increase (Transfer)	17,064	42,684
Usage	(3,948)	(35,640)
Reversal	(857)	(1,563)
Ending balance	76,500	64,241
Current	76,500	64,241
Restoration cost [member]
Disclosure of other provisions [line items]
Beginning balance	113,289	118,828
Increase (Transfer)	(1,933)	6,591
Usage	(2,990)	(5,394)
Reversal	(3,023)	(6,736)
Change in scope of consolidation	424
Ending balance	105,767	113,289
Current	22,343	37,906
Non-current	83,424	75,383
Others [member]
Disclosure of other provisions [line items]
Beginning balance	76,632	104,288
Increase (Transfer)	17,873	17,328
Usage	(2,266)	(15,851)
Reversal	(23,212)	(29,133)
Change in scope of consolidation	898
Ending balance	69,925	76,632
Current	67,147	73,465
Non-current	₩ 2,778	₩ 3,167

XML

Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [abstract]
Present value of defined benefit obligations	₩ 2,556,712	₩ 2,427,351
Fair value of plan assets	(2,189,375)	(2,069,710)
Liabilities	378,087	365,663
Assets in the statement of financial position	₩ 10,750	₩ 8,022

XML

Net Defined Benefit Liabilities - Summary of Changes in the Defined Benefit Obligations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ (248,047)	₩ (243,598)	₩ (225,667)
Interest expense	6,494	12,017	10,458
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	2,427,351	2,201,876
Current service cost	248,047	243,598
Interest expense	45,083	47,403
Benefit paid	(258,866)	(100,663)
Changes due to settlements of plan	1,075	910
Remeasurements:
Actuarial gains and losses arising from changes in demographic assumptions	5,191	39
Actuarial gains and losses arising from changes in financial assumptions	17,077	11,773
Actuarial gains and losses arising from experience adjustments	57,703	19,465
Changes in scope of consolidation	14,051	2,950
Ending balance	₩ 2,556,712	₩ 2,427,351	₩ 2,201,876

XML

Net Defined Benefit Liabilities - Summary of Changes in the Fair Value of Plan Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [Line Items]
Interest income	₩ 6,494	₩ 12,017	₩ 10,458
Plan assets [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning	2,069,710	1,643,046
Interest income	38,590	35,386
Remeasurements:
Return on plan assets (excluding amounts included in interest income)	2,589	(2,537)
Benefits paid	(213,953)	(87,119)
Employer contributions	284,243	476,916
Changes in scope of consolidation	8,196	4,018
Ending	₩ 2,189,375	₩ 2,069,710	₩ 1,643,046

XML

Net Defined Benefit Liabilities - Summary of Amounts Recognized the Operating Expenses in the Consolidated Statements of Operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Changes in net defined benefit liability (asset) [abstract]
Current service cost	₩ 248,047	₩ 243,598	₩ 225,667
Net Interest cost	6,494	12,017	10,458
Past service cost	1,075	910	9,801
Transfer out	(16,514)	(16,215)	(13,881)
Total expenses	₩ 239,102	₩ 240,310	₩ 232,045

XML

Net Defined Benefit Liabilities - Summary of Principal Actuarial Assumptions (Detail)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Discount rate	1.93%	1.97%	2.32%
Future salary increase	4.88%	4.92%	5.08%

XML

Net Defined Benefit Liabilities - Summary of Sensitivity of the Defined Benefit Obligations (Detail) ₩ in Millions	Dec. 31, 2020 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	₩ (86,288)
Effect on defined benefit obligation, decrease in assumption	₩ 93,254
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	₩ 85,344
Effect on defined benefit obligation, decrease in assumption	₩ (79,970)

XML

Net Defined Benefit Liabilities - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Expected contributions to post-employment benefit plans	₩ 355,481
Weighted average duration of the defined benefit obligations	6 years 8 months 12 days

XML

Net Defined Benefit Liabilities - Summary of Expected Maturity Analysis of Undiscounted Pension Benefits (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 3,583,273
Less than 1 year [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	232,550
Between 1-2 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	271,366
Between 2-5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	794,840
More than 5 years [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Pension benefits	₩ 2,284,517

XML

Defined Contribution Plan - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Classes of employee benefits expense [abstract]
Defined Contribution plan recognized expenses	₩ 61,912	₩ 57,170	₩ 48,210

XML

Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2020 $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of detailed information about borrowings [line items]
Limit	₩ 2,559,505	$ 281,054
Used amount	202,577	93,471
Bank overdraft [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	1,502,000
Used amount	0
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	37,700
Used amount	2,714
Insurance for Economic Cooperation project [Member] | Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	3,240
Used amount	1,732
Collateralised loans on electronic receivable-trade [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	522,849
Used amount	23,475
Plus electronic notes payable [member] | Industrial Bank of Korea [member]
Disclosure of detailed information about borrowings [line items]
Limit	50,000
Used amount	331
Loans for working capital [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	243,593
Used amount	152,243
Facility loans [member] | Kookmin Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit | $		212,000
Used amount | $		48,855
Facility loans [member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Limit	100,123
Used amount	55
Derivatives transaction limit [member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Limit	100,000
Used amount	₩ 22,027
Derivatives transaction limit [member] | Woori Bank and others [Member]
Disclosure of detailed information about borrowings [line items]
Limit | $		69,054
Used amount | $		$ 44,616

XML

Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2020 $ in Thousands, ₩ in Millions	KRW (₩)	USD ($)
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 1,205,141	$ 72,045
Performance guarantee [member] | Seoul Guarantee Insurance and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	208,386
Performance guarantee [member] | Korea Development Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		8,569
Performance guarantee [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	9,690
Guarantee for import letters of credit [member] | Industrial Bank of Korea and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		5,000
Guarantee for payment in foreign currency [member] | KEB Hana Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		40,840
Comprehensive credit line [member] | KEB Hana Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	41,100	8,700
Bid guarantee [member] | KEB Hana Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		400
Bid guarantee [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	80,246
Performance guarantee/Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	393,019
Guarantee for advance payments/others [member] | Korea Software Financial Cooperative and others [Member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	388,656
Guarantees for licensing [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	7,748
Warranty guarantee [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	1,305
Merchant business guarantee insurance [member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	237
Guarantee for payment in won currency [Member] | Shinhan Bank and others [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	70,962
Refund guarantee for advances received [Member] | Korea Development Bank [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit | $		$ 8,536
Guarantees for depositions [Member] | Seoul guarantee insurance [member]
Disclosure of detailed information about borrowings [line items]
Guarantees limit	₩ 3,792

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Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 KRW (₩)
Disclosure of detailed information about borrowings [line items]
Used amount	₩ 7,316,298	$ 284,000,000	$ 519,598,989	₩ 7,298,867
Maturity	Jun. 5, 2025
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] | Shinhan Bank [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Gasan Solar Power Plant Inc.
Limit	₩ 4,700
Used amount	₩ 1,371
Maturity	Jan. 08, 2025
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] | Suhyup Bank [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	SPP Inc.
Limit	₩ 3,250
Used amount	₩ 932
Maturity	Feb. 16, 2024
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] | Suhyup Bank One [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Korea Cell Inc.
Limit	₩ 3,250
Used amount	₩ 880
Maturity	Feb. 16, 2024
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] | Suhyup Bank Two [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	San-Ya Agricultural Association Corporation
Limit	₩ 3,250
Used amount	₩ 888
Maturity	Feb. 16, 2024
KT Engineering Co Ltd KT ENGCORE Co Ltd [Member] | NH Investment Securities CoLtd [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Ciocanesti Korea Co., Ltd.
Limit	₩ 7,600
Used amount	₩ 7,600
Maturity	Jun. 8, 2017
KT Hitel Co., Ltd. [member] | Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Shinhan Bank
Limit	₩ 700
Nasmedia Co Ltd [member] | Korea Securities Finance Corp [Member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Subject to payment guarantees	Stockholders Association Members
Limit	₩ 5,654
Used amount	₩ 2,735
Bottom of range [member] | KT Hitel Co., Ltd. [member] | Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 17, 2020
Top of range [member] | KT Hitel Co., Ltd. [member] | Cash payers [member] | Guarantees [member]
Disclosure of detailed information about borrowings [line items]
Maturity	Apr. 16, 2021

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Commitments and Contingencies - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩) Lawsuits	Dec. 31, 2019 KRW (₩)
Commitments and contingencies [abstract]
Severally liable for reimbursement	₩ 1,618
Number of lawsuits | Lawsuits	195
Litigation settlement claim amount	₩ 110,409	₩ 214,877
Litigation provision	₩ 76,500	62,241
New town development consortium percentage of ownership interest	2.50%
Contract amount not yet recognized as liabilities	₩ 596,983	₩ 851,798

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Leases - Summary of balance sheet information about leases for lessee (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 1,217,179	₩ 1,268,329
Investment property	1,368,453	1,387,430	₩ 1,091,084
Lease liabilities
Current		392,433
Non-Current		818,919
Lease liability recognized	1,143,640	1,211,352
Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	585,034	788,497
Investment property	19,456
Lease liabilities
Current	281,961	355,833
Non-Current	798,416	373,307
Lease liability recognized	1,143,640
Property and building [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets		1,020,619
Property and building [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	1,073,207
Machinery and track facilities [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets		140,296
Machinery and track facilities [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	42,127
Other [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets		₩ 107,414
Other [member] | Previously stated [member]
Disclosure of balance sheet information about leases for lessee [Line Items]
Right-of-use assets	₩ 101,845

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Leases - Summary of statement of profit or loss information about leases for lessee (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 404,175	₩ 442,629
Depreciation of Investment Properties	19,113	21,809
Interest expense relating to lease liabilities	44,091	55,001
Expense relating to short-term leases	10,998	14,718
Expense relating to leases of low-value assets that are not short-term leases	25,894	26,575
Expense relating to variable lease payments not included in lease liabilities	8,096	5,993
Property and building [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	290,168	300,773
Machinery and track facilities [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	58,419	89,452
Other [member]
Disclosure of statement of profit or loss information about leases for lessee [Line Items]
Depreciation of Right-of-use assets	₩ 55,588	₩ 52,402

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Leases - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Arrangement Involving Legal Form Of Lease [Abstract]
Cash outflow for leases	₩ 492,772	₩ 532,730
Increase decrease in right of use assets	₩ 404,293

XML

Share Capital - Summary of Share Capital (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of classes of share capital [Line Items]
Ordinary Shares	₩ 1,564,499	₩ 1,564,499
Ordinary shares [member]
Disclosure of classes of share capital [Line Items]
Number of issued 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, 2020	Dec. 31, 2019
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, 2020	Dec. 31, 2019
Miscellaneous equity [abstract]
Legal reserve	₩ 782,249	₩ 782,249
Voluntary reserves	4,651,362	4,651,362
Unappropriated retained earnings	6,721,809	6,157,305
Total	₩ 12,155,420	₩ 11,590,916

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Retained Earnings - Summary of Retained Earnings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Miscellaneous equity [abstract]
Minimum percentage of cash dividend declared appropriation to legal reserve	10.00%	10.00%
Percentage of legal reserve equal to capital stock issued	50.00%	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, 2020	Dec. 31, 2019	Dec. 31, 2018
Total accumulated other comprehensive income	₩ 86,051	₩ 194,934	₩ 50,158
Changes in investments in associates and joint ventures [member]
Total accumulated other comprehensive income	16,257	1,556	(871)
Loss on derivatives valuation [member]
Total accumulated other comprehensive income	19,809	(7,624)
Gain on valuation of financial assets at fair value through other comprehensive income [member]
Total accumulated other comprehensive income	61,438	211,573	96,704
Exchange differences on translation for foreign operations [member]
Total accumulated other comprehensive income	₩ (11,453)	₩ (10,571)	₩ (15,201)

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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, 2020	Dec. 31, 2019
Beginning	₩ 194,934	₩ 50,158
Increase /decrease	(220,314)	189,460
Reclassified to gain or loss	111,431	(44,684)
Ending	86,051	194,934
Changes in investments in associates and joint ventures [member]
Beginning	1,556	(871)
Increase /decrease	14,701	2,427
Ending	16,257	1,556
Gain or Loss on derivatives valuation [member]
Beginning	(7,624)	(30,474)
Increase /decrease	(83,998)	67,534
Reclassified to gain or loss	111,431	(44,684)
Ending	19,809	(7,624)
Gain on valuation of financial assets at fair value through other comprehensive income [member]
Beginning	211,573	96,704
Increase /decrease	(150,135)	114,869
Ending	61,438	211,573
Exchange differences on translation for foreign operations [member]
Beginning	(10,571)	(15,201)
Increase /decrease	(882)	4,630
Ending	₩ (11,453)	₩ (10,571)

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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, 2020	Dec. 31, 2019
Miscellaneous equity [abstract]
Treasury stock	₩ (882,224)	₩ (825,838)
Gain or loss on disposal of treasury stock	(17,579)	1,229
Share-based payments	5,901	7,769
Others	(340,882)	(353,243)
Total	₩ (1,234,784)	₩ (1,170,083)

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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, 2020	Dec. 31, 2019
Miscellaneous equity [abstract]
Number Of treasury shares reissued	1,150,580
Number of treasury shares acquired	4,550,000
Treasury shares, Amount directly reflected in equity	₩ 7,288	₩ 603

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Accumulated Other Comprehensive Income and Other Components of Equity - Summary of Treasury Stock (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Miscellaneous equity [abstract]
Number of shares (in shares)	19,269,678	15,870,258
Amounts (In millions of Korean won)	₩ 882,224	₩ 825,838

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Share-based Payments - Summary of Details of Share-based Payments (Detail)	12 Months Ended
	Dec. 31, 2020 KRW (₩)
Disclosure of terms and conditions of share-based payment arrangement [line items]
Grant date	14th grant June 16, 2020
Vesting conditions	Service condition: 1 year Non-market performance condition: achievement of performance
Fair value per option	₩ 22,700
Total compensation costs	₩ 5,187,000,000
Employee wage negotiation [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Grant date	Employee wage negotiation September 21, 2020
Vesting conditions	All employees Current employees as of September 21, 2020
Fair value per option	₩ 22,950
Total compensation costs	₩ 23,317,000,000

XML

Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	372,023	353,325
Granted	1,418,961	372,023
Expired	241,548	256,543
Exercised	1,150,580	96,782
Ending	398,856	372,023
12th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning		353,325
Expired		256,543
Exercised		96,782
13th grant [member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning	372,023
Granted		372,023
Expired	241,548
Exercised	130,475
Ending		372,023
14Th grant [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Granted	398,856
Ending	398,856
Employee wage negotiation [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Granted	1,020,105
Exercised	1,020,105

XML

Share-based Payments - Summary of Changes in the Number of Stock Options and the Weighted-Average Exercise Price (Parenthetical) (Detail) - ₩ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Weighted average exercise price of share options exercised	₩ 25,486	₩ 27,482

XML

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Explanation of Revenue in the Consolidated Statement of operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Revenue from contracts with customers	₩ 23,895,631	₩ 24,441,122	₩ 23,012,257
Revenue from other sources	545,016	458,067	423,793
Operating revenue	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050

XML

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Mobile services	₩ 6,805,218	₩ 6,795,124	₩ 6,827,685
Fixed-line services:	4,827,015	4,866,698	4,869,253
Fixed-line and VoIP telephone services	1,463,553	1,578,546	1,708,319
Broadband Internet access services	2,256,188	2,177,447	2,112,763
Data communication services	1,107,274	1,110,705	1,048,171
Media and content	2,637,691	2,516,256	2,261,808
Financial services	3,493,920	3,641,655	3,444,917
Sale of goods	3,593,127	4,194,168	3,288,911
Others	3,083,676	2,885,288	2,743,476
Operating revenue	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050

XML

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, 2020	Dec. 31, 2019
Disclosure of revenue from contracts with customers [line items]
Contract assets	[1]	₩ 586,438	₩ 557,041
Contract liabilities	[1]	384,133	365,610
Deferred revenue		29,593	65,228
Revenue from contracts with customers [member]
Disclosure of revenue from contracts with customers [line items]
Contract assets		672,672	655,329
Contract liabilities		413,707	413,442
Deferred revenue		₩ 89,694	₩ 92,557

[1] The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

XML

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Parenthetical) (Detail) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure of revenue from contracts with customers [line items]
Contract assets	[1]	₩ 586,438	₩ 557,041
Contract liabilities	[1]	384,133	365,610
long term construction contract [Member]
Disclosure of revenue from contracts with customers [line items]
Contract assets		86,234	98,288
Contract liabilities		₩ 29,574	₩ 47,832

[1] The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

XML

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, 2020	Dec. 31, 2019
Incremental cost of contract establishment [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 1,726,191	₩ 1,764,009
Cost of Contract performance [Member]
Statement [Line Items]
Incremental cost of contract establishment	₩ 78,757	₩ 85,234

XML

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Operating expenses	₩ 1,831,638	₩ 1,681,039

XML

Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail of Revenue Arising from Carried-Forward Contract Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Allocation of the transaction price	₩ 251,975	₩ 266,478	₩ 183,905
Deferred revenue of joining/installment fee	42,685	44,032	39,975
Others			1,536
Total	₩ 294,660	₩ 310,510	₩ 225,416

XML

Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Profit (loss) [abstract]
Salaries and wages	₩ 4,123,680	₩ 3,974,233	₩ 3,845,842
Depreciation	2,605,128	2,530,252	2,674,205
Depreciation of right-of-use assets	404,175	442,629
Amortization of intangible assets	624,982	656,611	607,527
Commissions	965,461	1,115,477	1,080,168
Interconnection charges	500,081	534,025	579,613
International interconnection fee	172,529	240,254	226,627
Purchase of inventories	3,681,801	4,453,820	4,414,094
Changes of inventories	257,041	282,957	(432,607)
Sales commission	2,337,127	2,315,731	1,942,841
Service cost	2,102,875	1,610,261	1,540,869
Utilities	360,797	332,816	323,411
Taxes and dues	283,197	277,742	285,131
Rent	136,355	193,357	460,377
Insurance premium	71,018	82,404	73,654
Installation fee	132,117	155,178	143,669
Advertising expenses	132,466	150,166	157,675
Research and development expenses	156,940	165,028	176,758
Card service cost	2,941,669	3,066,766	3,112,618
Others	1,428,875	1,292,512	1,122,718
Total	₩ 23,418,314	₩ 23,872,219	₩ 22,335,190

XML

Operating Expenses - Summary of Details of Employee Benefits (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Profit (loss) [abstract]
Short-term employee benefits	₩ 3,770,786	₩ 3,663,337	₩ 3,505,214
Post-employment benefits (Defined benefit plan)	239,102	240,310	232,045
Post-employment benefits (Defined contribution plan)	61,912	57,170	48,210
Share-based payment	28,604	6,398	8,439
Others	23,276	7,018	51,934
Total	₩ 4,123,680	₩ 3,974,233	₩ 3,845,842

XML

Financial Income and Costs - Summary of Details of Financial Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Profit (loss) [abstract]
Interest income	₩ 270,571	₩ 282,704	₩ 244,796
Gain on foreign currency transactions	17,493	24,596	17,175
Gain on foreign currency translation	164,351	17,979	3,691
Gain on settlement of derivatives	9,397	9,016	27,950
Gain on valuation of derivatives	172	77,353	66,305
Others	36,630	12,747	14,326
Total	₩ 498,614	₩ 424,395	₩ 374,243

XML

Financial Income and Costs - Summary of Details of Financial Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Finance Income [line items]
Interest expenses	₩ 263,579	₩ 278,427	₩ 296,874
Loss on foreign currency transactions	27,805	30,267	49,156
Loss on foreign currency translation	26,340	93,977	72,642
Loss on settlement of derivatives	1,406	20
Loss on valuation of derivatives	163,763	15,867	2,045
Others	16,338	2,277	1,124
Total	507,383	432,133	435,659
Loans and receivables [member]
Disclosure Of Finance Income [line items]
Loss on disposal of trade receivables	₩ 8,152	₩ 11,298	₩ 13,818

XML

Deferred Income Tax and Income Tax Expense - Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	₩ 433,698	₩ 424,856
Deferred income tax liabilities	(429,331)	(425,468)
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax assets	2,036,193	2,033,725
Deferred income tax liabilities	(2,031,826)	(2,034,337)
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	404,434	419,889
Deferred income tax liabilities	(637,317)	(538,578)
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	1,631,759	1,613,836
Deferred income tax liabilities	₩ (1,394,509)	₩ (1,495,759)

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets and liabilities [abstract]
Beginning	₩ (612)	₩ 260,584
Changes to the statement of operations	(72,124)	(199,527)	₩ 15,016
Changes to other comprehensive loss (income)	77,103	(61,669)	36,115
Ending	₩ 4,367	₩ (612)	₩ 260,584

XML

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	₩ (612)	₩ 260,584
Consolidated statements of operations	(72,124)	(199,527)	₩ 15,016
Other comprehensive income	77,103	(61,669)
Ending	4,367	(612)	260,584
Deferred tax liabilities derivative assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(10,898)
Consolidated statements of operations	10,055	(10,250)
Other comprehensive income		(648)
Ending	(843)	(10,898)
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	(108,191)	(93,604)
Consolidated statements of operations	(64,553)	(14,622)
Other comprehensive income	(8,820)	35
Ending	(181,564)	(108,191)	(93,604)
Deferred tax liabilities depreciation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(11,606)	(424)
Consolidated statements of operations	7,431	(11,182)
Ending	(4,175)	(11,606)	(424)
Deferred tax liabilities advanced depreciation provision [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(313,121)	(313,184)
Consolidated statements of operations	1,203	63
Ending	(311,918)	(313,121)	(313,184)
Deferred tax liabilities deposits for severance benefits [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(496,853)	(398,982)
Consolidated statements of operations	(26,419)	(99,126)
Other comprehensive income	2,015	1,255
Ending	(521,257)	(496,853)	(398,982)
Deferred tax liabilities accrued income [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(1,541)	(1,558)
Consolidated statements of operations	(212)	17
Ending	(1,753)	(1,541)	(1,558)
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	(204)	(204)
Ending	(204)	(204)	(204)
Other deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(523,150)	(284,255)
Consolidated statements of operations	53,797	(238,725)
Other comprehensive income	0	(170)
Ending	(469,353)	(523,150)	(284,255)
Deferred tax derivative assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning		8,341
Consolidated statements of operations		(850)
Other comprehensive income		(7,491)
Ending			8,341
Deferred tax assets provision for impairment or trade receivables [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	84,071	99,887
Consolidated statements of operations	4,994	(15,816)
Ending	89,065	84,071	99,887
Deferred tax assets inventory valuation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	23	121
Consolidated statements of operations	(259)	(98)
Ending	(236)	23	121
Deferred tax assets contribution for construction [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	16,154	16,800
Consolidated statements of operations	246	(646)
Ending	16,400	16,154	16,800
Deferred Tax Assets Provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	32,824	36,178
Consolidated statements of operations	1,198	(3,354)
Ending	34,022	32,824	36,178
Deferred tax assets property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	228,655	230,278
Consolidated statements of operations	(1,695)	(1,623)
Ending	226,960	228,655	230,278
Deferred Tax assets assets retirement obligation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	29,016	24,532
Consolidated statements of operations	(883)	4,484
Ending	28,133	29,016	24,532
Deferred tax assets withholding of facilities expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	6,183	6,609
Consolidated statements of operations	(436)	(426)
Ending	5,747	6,183	6,609
Deferred tax assets deduction of installment receivables [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	48	42
Consolidated statements of operations	(20)	6
Ending	28	48	42
Deferred tax assets gain or loss foreign currency translation [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	20,677	10,672
Consolidated statements of operations	(20,539)	10,005
Ending	138	20,677	10,672
Deferred tax assets deferred revenue [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	35,800	39,641
Consolidated statements of operations	7,230	(3,841)
Ending	43,030	35,800	39,641
Deferred tax assets real-estate sales [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	13,685	21,728
Consolidated statements of operations	(13,685)	(8,043)
Ending		13,685	21,728
Other deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	708,437	537,209
Consolidated statements of operations	(123,798)	174,177
Other comprehensive income	948	(2,949)
Ending	585,587	708,437	537,209
Deferred tax assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	1,905,480	1,673,777
Consolidated statements of operations	(20,492)	235,361
Other comprehensive income	6,274	(3,658)
Ending	1,891,262	1,905,480	1,673,777
Deferred tax assets defined benefit liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	569,471	513,842
Consolidated statements of operations	13,707	48,847
Other comprehensive income	15,186	6,782
Ending	598,364	569,471	513,842
Deferred tax assets tax credit carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	128,245	102,898
Consolidated statements of operations	16,686	25,347
Ending	144,931	128,245	102,898
Deferred tax liabilities contract assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(53,750)	(11,505)
Consolidated statements of operations	(112,794)	(42,245)
Ending	(166,544)	(53,750)	(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]
Beginning	(323)	(661)
Consolidated statements of operations	(304)	338
Ending	(627)	(323)	(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]
Beginning	(103,837)	(41,798)
Consolidated statements of operations	(4,420)	(3,556)
Other comprehensive income	77,634	(58,483)
Ending	(30,623)	(103,837)	(41,798)
Deferred tax assets unsettled expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	160,436	127,897
Consolidated statements of operations	(24,358)	32,539
Ending	136,078	160,436	127,897
Temporary differences [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(128,857)	157,686
Consolidated statements of operations	(88,810)	(224,874)
Other comprehensive income	77,103	(61,669)
Ending	(140,564)	(128,857)	157,686
Deferred tax liabilities [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(2,034,337)	(1,516,091)
Consolidated statements of operations	(68,318)	(460,235)
Other comprehensive income	70,829	(58,011)
Ending	(2,031,826)	(2,034,337)	(1,516,091)
Deferred Tax Liabilities Contract Cost [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning	(410,863)	(369,916)
Consolidated statements of operations	67,898	(40,947)
Ending	(342,965)	₩ (410,863)	₩ (369,916)
Deferred Tax Assets Derivative instrument [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Consolidated statements of operations	40,342
Other comprehensive income	(9,860)
Ending	30,482
Deferred Tax Assets Contract Assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Consolidated statements of operations	97,464
Ending	₩ 97,464

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets and liabilities [abstract]
Gain on valuation of financial assets at fair value through other comprehensive income, Before recognition	₩ 54,969	₩ 225,635	₩ 59,384
Gain (loss) on valuation of hedge instruments (loss)liabilities, Before recognition	37,247	31,003	(36,756)
Remeasurements of net defined benefit liabilities, Before recognition	(77,382)	(33,814)	(116,324)
Share of Gain (loss) of associates and joint ventures, and others, Before recognition	25,538	4,493	(1,036)
Exchange differences on translation for foreign operations, Before recognition	(3,614)	6,692	3,989
Total, Before recognition	36,758	234,009	(90,743)
Gain on valuation of financial assets at fair value through other comprehensive income, Tax effect	(12,972)	(58,483)	(15,573)
Gain (loss) on valuation of hedge instruments (loss)liabilities, Tax effect	(9,860)	(8,139)	9,745
Remeasurements of net defined benefit liabilities, Tax effect	17,201	8,037	42,813
Share of Gain (loss) of associates and joint ventures, and others, Tax effect	(8,820)	(1,327)	179
Exchange differences on translation for foreign operations, Tax effect	948	(1,759)	(1,049)
Total, Tax effect	77,103	(61,669)	36,115
Gain on valuation of financial assets at fair value through other comprehensive income, After recognition	41,997	167,152	43,811
Gain (loss) on valuation of hedge instruments (loss)liabilities, After recognition	27,387	22,864	(27,011)
Remeasurements of net defined benefit liabilities, After recognition	(60,181)	(25,777)	(73,511)
Share of Gain (loss) of associates and joint ventures, and others, After recognition	16,718	3,166	(857)
Exchange differences on translation for foreign operations, After recognition	(2,666)	4,933	2,940
Total other comprehensive income (loss)	₩ 23,255	₩ 172,338	₩ (54,628)

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets and liabilities [abstract]
Current income tax expense	₩ 213,225	₩ 120,533	₩ 329,581
Impact of change in deferred taxes	72,124	199,527	(15,016)
Income tax expense	₩ 285,349	₩ 320,060	₩ 314,565

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets and liabilities [abstract]
Profit before income tax expense	₩ 1,031,605	₩ 1,015,928	₩ 1,033,977
Statutory income tax expense	273,329	269,018	273,982
Tax effect
Income not taxable for taxation purposes	(24,657)	(1,265)	(85,322)
Non-deductible expenses	31,741	19,543	18,126
Tax credit	(47,056)	(39,190)	(20,319)
Additional payment of income taxes	429	3,832	11,439
Tax effect and adjustment on consolidation
Goodwill impairment		159	137
Eliminated dividend income form subsidiaries	20,682	21,917	31,966
Changes of out-side tax effect	38,552	13,539	618
Tax effect of investment in kind			82,820
Intangible Asset impairment and amortization	3,790	14,052
Reversal expenses of contract cost assets	(6,643)	11,213
Others	(4,818)	7,242	1,118
Income tax expense	₩ 285,349	₩ 320,060	₩ 314,565

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Deferred Income Tax and Income Tax Expense - Summary of expected period of expiry for unused tax losses not recognized in deferred tax assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 127,793	₩ 142,075
2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,140	18,582
2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	80,649	2,140
2023
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	5,848	80,649
2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	4,867	5,848
2025
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,847	4,867
2026
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	9,709	9,390
2027
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	8,389	7,888
2028
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	8,426	10,064
2029
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	2,579	2,030
2030
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unused tax losses for which no deferred tax asset recognised	₩ 2,339	₩ 617

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Deferred Income Tax and Income Tax Expense - Summary of deferred tax assets and liabilities that are not recognized (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible Temporary Differences For Which No Deferred Tax Asset and Liabiities Is Recognised	₩ 679,419	₩ 674,102
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	142,416	152,036
Investment in subsidiaries, associates, and joint ventures
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible Temporary Differences For Which No Deferred Tax Asset and Liabiities Is Recognised	583,890	610,351
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	132,848	141,664
Unused tax loss
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible Temporary Differences For Which No Deferred Tax Asset and Liabiities Is Recognised	28,115	31,257
Unused Tax credit
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible Temporary Differences For Which No Deferred Tax Asset and Liabiities Is Recognised	2,654
Others
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible Temporary Differences For Which No Deferred Tax Asset and Liabiities Is Recognised	64,760	32,494
Others
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Taxable Temporary Differences For Which No Deferred Tax Asset and Liabilities Is Recognised	₩ 9,568	₩ 10,372

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings per share [abstract]
Profit (loss) attributable to ordinary shares	₩ 700,889	₩ 645,703	₩ 645,571
Weighted average number of ordinary shares outstanding	245,207,307	245,171,283	245,049,466
Basic earnings per share (In Korean won)	₩ 2,858	₩ 2,634	₩ 2,634
Profit attributable to ordinary shares (In millions of Korean won)	₩ 700,889	₩ 645,703	₩ 645,571
Adjustment to net income attributable to ordinary shares (In millions of Korean won)		(157)
Diluted profit attributable to ordinary shares (In millions of Korean won)	₩ 700,889	₩ 645,546	₩ 645,571
Number of dilutive potential ordinary shares outstanding	69,598	70,267	1,163
Weighted average number of ordinary shares outstanding	245,276,905	245,241,550	245,050,629
Diluted earnings per share (In Korean won)	₩ 2,858	₩ 2,632	₩ 2,634

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Dividend - Additional Information (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Dividends [abstract]
Dividends paid	₩ 269,766	₩ 269,659	₩ 245,097
Dividends paid per share	₩ 1,100	₩ 1,100	₩ 1,000
Dividends declared	₩ 326,487
Dividends declared per share	₩ 1,350

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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]
Profit for the year	₩ 746,256	₩ 695,868	₩ 719,412
Adjustments to reconcile net income
Income tax expense	285,349	320,060	314,565
Interest income	(291,425)	(303,722)	(265,817)
Interest expense	265,035	278,975	296,894
Dividends income	(4,442)	(3,408)	(2,910)
Depreciation	2,635,307	2,567,754	2,735,413
Amortization of intangible assets	628,154	660,705	629,526
Depreciation of right-of-use assets	404,175	442,629
Provision for severance benefits	255,615	256,525	245,926
Impairment losses on trade receivables	139,957	60,193	113,064
Share of net profit or loss of associates and joint ventures	(18,041)	3,252	5,912
Loss(gain) on disposal of associates and joint ventures	111	30	(3,737)
Loss(gain) on disposal of right-of-use assets	2,047	1,556
Impairment losses on assets held for sale		7,586
Loss on disposal of property and equipment and investment in properties	55,590	49,284	68,688
Loss(gain) on disposal of intangible assets	246	(1,248)	(4,256)
Loss on impairment of intangible assets	211,636	61,899	12,997
Loss(gain) on foreign currency translation	(138,011)	75,998	68,952
Loss(gain) on valuation and settlement of derivatives, net	155,600	(70,482)	(92,210)
Loss(gain) on disposal of financial assets at fair value through profit or loss	329	(5,115)	(1,712)
Gain on valuation of financial assets at fair value through profit or loss	(59,044)	(4,335)	(10,768)
Loss(gain) on disposal of financial assets at amortized cost	(138)	43	(44)
Others	127,949	143,500	(55,969)
Changes in operating assets and liabilities
Decrease(increase) in trade receivables	66,462	(433,292)	(81,217)
Decrease(increase) in other receivables	685,209	(79,130)	356,643
Decrease(increase) in other current assets	9,089	984	(123,258)
Decrease(increase) in other non-current assets	(86,039)	(178,180)	19,556
Decrease(increase) in inventories	288,507	240,488	(480,543)
Increase(decrease) in trade payables	(135,760)	44,354	(167,841)
Decrease in other payables	(1,232,646)	(102,375)	(448,301)
Increase in other current liabilities	127,076	43,384	291,548
Increase(decrease) in other non-current liabilities	(56,319)	(199,547)	144,072
Decrease(Increase) in provisions	2,264	(12,164)	85,946
Decrease(Increase) in deferred revenue	(1,948)	641	48,201
Increase in plan assets	(136,336)	(375,499)	(53,301)
Payment of severance benefits	(186,520)	(119,716)	(153,209)
Cash generated from operations (1+2+3)	₩ 4,745,293	₩ 4,058,065	₩ 4,212,222

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]
Reclassification of the current portion of borrowings	₩ 1,229,359	₩ 1,030,056	₩ 1,149,599
Reclassification of construction-in-progress to property and equipment	3,011,519	2,698,146	1,988,014
Reclassification of accounts payable from property and equipment	22,052	685,859	122,185
Reclassification of accounts payable from intangible assets	(345,675)	(356,911)	584,595
Reclassification of payable from defined benefit liability	72,346	(19,053)	(31,838)
Reclassification of payable from plan assets	₩ 66,046	₩ (14,298)	₩ (9,497)

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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, 2020	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	₩ 8,471,738	₩ 6,847,376
Cash flows	(259,601)	112,632
Changes in Accounting Policy		771,410
Newly acquired	507,472	774,906
Exchange difference	(12,607)	6,435
Fair value change	(27,085)	(31,456)
Change in Consolidation Scope	3,564
Other changes	(100,576)	(9,565)
Ending	8,582,905	8,471,738
Borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	7,298,867	6,648,294
Cash flows	167,867	574,175
Newly acquired	17,523
Exchange difference	(157,985)	64,398
Other changes	(9,974)	12,000
Ending	7,316,298	7,298,867
Financial lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	1,211,351	163,858
Cash flows	(447,784)	(485,444)
Changes in Accounting Policy		771,410
Newly acquired	473,477	774,906
Exchange difference	(3)
Fair value change	40
Change in Consolidation Scope	3,564
Other changes	(97,005)	(13,379)
Ending	1,143,640	1,211,351
Lease liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Cash flows	(13,674)
Newly acquired	13,674
Derivative assets [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	(58,576)	(29,843)
Cash flows	34,933	33,635
Exchange difference	2,870	(53,729)
Fair value change	(3,456)	(11,398)
Other changes	16,623	2,759
Ending	(7,606)	(58,576)
Derivative liabilities [member]
Disclosure of reconciliation of liabilities arising from financing activities [line items]
Beginning	20,096	65,067
Cash flows	(943)	(9,734)
Newly acquired	2,798
Exchange difference	142,511	(4,234)
Fair value change	(23,669)	(20,058)
Other changes	(10,220)	(10,945)
Ending	₩ 130,573	₩ 20,096

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Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [Line Items]
Operating revenues	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050
Operating income (loss)	1,022,333	1,026,970	1,100,860
Depreciation and Amortization	3,634,284	3,629,492	3,281,732
Operating segments [member]
Disclosure of operating segments [Line Items]
Operating revenues	28,612,919	28,863,426	27,346,281
Operating income (loss)	1,175,172	1,080,040	1,201,682
Depreciation and Amortization	3,718,122	3,709,297	3,274,768
Operating segments [member] | ICT [member]
Disclosure of operating segments [Line Items]
Operating revenues	18,275,765	18,527,631	17,724,320
Operating income (loss)	809,741	634,046	933,191
Depreciation and Amortization	3,233,878	3,229,159	2,917,163
Operating segments [member] | Finance [member]
Disclosure of operating segments [Line Items]
Operating revenues	3,686,430	3,795,185	3,771,681
Operating income (loss)	85,008	158,235	148,440
Depreciation and Amortization	53,098	27,852	22,580
Operating segments [member] | Satellite TV [member]
Disclosure of operating segments [Line Items]
Operating revenues	706,631	694,637	690,821
Operating income (loss)	71,345	69,357	66,735
Depreciation and Amortization	84,931	94,992	98,310
Operating segments [member] | Others [member]
Disclosure of operating segments [Line Items]
Operating revenues	5,944,093	5,845,973	5,159,459
Operating income (loss)	209,078	218,402	53,316
Depreciation and Amortization	346,215	357,294	236,715
Elimination [member]
Disclosure of operating segments [Line Items]
Operating revenues	(4,172,272)	(3,964,237)	(3,910,231)
Operating income (loss)	(152,839)	(53,070)	(100,822)
Depreciation and Amortization	₩ (83,838)	₩ (79,805)	₩ 6,964

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Segment Information - Summary of Segment Information (Parenthetical) (Detail) ₩ in Millions	Dec. 31, 2020 KRW (₩)
ICT [member]
Disclosure of operating segments [line items]
Property and equipment and intangible assets	₩ 13,583,173

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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of geographical areas [Line Items]
Operating revenues	₩ 24,440,647	₩ 24,899,189	₩ 23,436,050
Non-current assets	18,953,009	19,275,095
Domestic [member]
Disclosure of geographical areas [Line Items]
Operating revenues	24,368,729	24,832,068	23,376,218
Non-current assets	18,934,766	19,198,416
Overseas [member]
Disclosure of geographical areas [Line Items]
Operating revenues	71,918	67,121	₩ 59,832
Non-current assets	₩ 18,243	₩ 76,679

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Related Party Transactions - Summary of Related Parties Outstanding Balances of Receivables and Payables (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Dividend Income			₩ 11,146
Payables	₩ 20,857	₩ 57,907
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Dividend Income			8,932
Others [member]
Disclosure of transactions between related parties [line items]
Dividend Income			₩ 2,148
Trade receivables [member]
Disclosure of transactions between related parties [line items]
Dividend Income	1,304	1,625
Trade receivables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Dividend Income	457	608
Trade receivables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Dividend Income	775	583
Trade receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Dividend Income	72	434
Loans and receivables [member]
Disclosure of transactions between related parties [line items]
Dividend Income	50,311	37,941
Loans and receivables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Dividend Income	16,200	23,100
Loans and receivables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Dividend Income	32,964	13,664
Loans and receivables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Dividend Income	1,147	1,177
Other payables [member]
Disclosure of transactions between related parties [line items]
Payables	1,749	1,268
Other payables [member] | K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Payables	20,857	57,907
Other payables [member] | K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Payables	891	557
Other payables [member] | Others [member]
Disclosure of transactions between related parties [line items]
Payables	₩ 858	₩ 711

XML

Related Party Transactions - Summary of Significant Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Sales	₩ 18,765	₩ 23,416	₩ 24,312
Purchases	18,499	19,055	128,252
Dividend Income			11,146
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Sales	2,298	1,302	2,088
Purchases			31,984
Dividend Income			8,932
MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			493
Purchases			12,023
Dividend Income			8
MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			229
Purchases			8,775
Dividend Income			8
MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			540
Purchases			9,159
Dividend Income			8
MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			333
Purchases			11,549
Dividend Income			10
MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			1,378
Purchases			16,519
Dividend Income			12
MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			324
Purchases			11,193
Dividend Income			10
MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Sales			331
Purchases			10,499
Dividend Income			10
Others [member]
Disclosure of transactions between related parties [line items]
Sales	809		2,888
Purchases	10,272		9,547
Dividend Income			2,148
K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Sales	15,658	17,815	15,705
Purchases	₩ 8,227	8,524	7,004
NgeneBio [member]
Disclosure of transactions between related parties [line items]
Sales		1,498	₩ 3
Purchases		10,531
K-Realty CR-REITs No.10 [member]
Disclosure of transactions between related parties [line items]
Sales		₩ 2,801

XML

Related Party Transactions - Summary of Key Management Compensation (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Salaries and other short-term benefits	₩ 2,086	₩ 2,955	₩ 2,762
Post-employment benefits	390	321	751
Stock-based compensation	5,613	891	878
Total	₩ 8,089	₩ 4,167	₩ 4,391

XML

Related Party Transactions - Summary of Transactions Prior Liquidation (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement [Line Items]
Dividend Income			₩ 11,146
Payables	₩ 20,857	₩ 57,907
K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Dividend Income			8,932
Others [member]
Statement [Line Items]
Dividend Income			₩ 2,148
Acquisition of right of use assets [member]
Statement [Line Items]
Dividend Income		776
Acquisition of right of use assets [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Dividend Income		776
Finance costs [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Payables		2,225
Interest Expense [member]
Statement [Line Items]
Payables	917	2,225
Interest Expense [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Payables	917
Dividend Income [member]
Statement [Line Items]
Payables	17,345	15,354
Dividend Income [member] | K-Realty CR-REITs No.1 [member]
Statement [Line Items]
Payables	8,061	10,928
Dividend Income [member] | Others [member]
Statement [Line Items]
Payables	43	146
Dividend Income [member] | Korea Information & Technology Investment Fund (KIF Investment Fund) [member]
Statement [Line Items]
Payables	9,241	₩ 4,280
Interest income [member]
Statement [Line Items]
Dividend Income	14
Interest income [member] | K Bank Inc. [member]
Statement [Line Items]
Dividend Income	₩ 14

XML

Related Party Transactions - Summary of Fund Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Equity contributions in cash	₩ 255,302	₩ 25,603	₩ 24,713
Repayment	20,304	30,385
PT. Mitra Transaksi Indonesia [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			1,567
KT-IBKC future investment fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		3,750	(1,050)
Korea Electronic Vehicle Charging Service [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			168
Gyeonggi-KT Yoojin Superman Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	1,000	1,000	1,000
K-REALTY CR REIT [member]
Disclosure of transactions between related parties [line items]
Repayment		30,385
K Bank Inc. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	195,011	21,782	26,725
MOS GS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(147)
MOS Daegu Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(147)
MOS Chungcheong Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(153)
MOS Gangnam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(180)
MOS GB Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(203)
MOS BS Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(183)
MOS Honam Co., Ltd. [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			(206)
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	(109)	(174)	(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)	(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
Boston Global Film Contents Fund Lp [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash			₩ (986)
KT Philippines co. Ltd. {member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		99
Virtua Realm Sendirian Berhad [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		550
KT-Smart Factory Investment Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	2,800	2,800
KT-SB Venture Investment Fund [member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash		₩ (2,404)
Studio Discovery Co Ltd [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	3,000
KT Young Entrepreneurs DNA Investment Fund [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	3,600
Hyundai Robotics Co Ltd [Member]
Disclosure of transactions between related parties [line items]
Equity contributions in cash	50,000
K-Realty CR-REITs No.1 [member]
Disclosure of transactions between related parties [line items]
Repayment	₩ 20,304

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, 2020	Dec. 31, 2019	Dec. 31, 2018
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	₩ 25,220	₩ 45,149	₩ 7,212
Shareholders' equity	₩ 36,961	₩ 52,092	₩ 10,196
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	₩ (25,220)	₩ (45,149)	₩ (12,413)
Shareholders' equity	₩ (36,961)	₩ (52,092)	₩ (9,625)
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	₩ 2,811	₩ 24	₩ 12
Shareholders' equity	₩ 3,472	₩ 613	₩ 898
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	₩ (2,811)	₩ (24)	₩ (12)
Shareholders' equity	₩ (3,472)	₩ (613)	₩ (898)
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	₩ 973	₩ 425	₩ 1,059
Shareholders' equity	₩ 18,584	₩ 14,764	₩ 9,689
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	₩ (973)	₩ (482)	₩ (1,958)
Shareholders' equity	₩ (19,377)	₩ (19,280)	₩ (10,237)

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, P in Thousands, K in Thousands, FRw in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, in Thousands, in Thousands, in Thousands, ₩ in Millions	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 TZS (Tsh)	Dec. 31, 2020 XAF ( )	Dec. 31, 2020 SGD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 XDR ( )	Dec. 31, 2020 JPY (¥)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 PLN (zł)	Dec. 31, 2020 VND (₫)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 RWF (FRw)	Dec. 31, 2020 THB (฿)	Dec. 31, 2020 BWP (P)	Dec. 31, 2020 HKD ($)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2019 TZS (Tsh)	Dec. 31, 2019 XAF ( )	Dec. 31, 2019 USD ($)	Dec. 31, 2019 XDR ( )	Dec. 31, 2019 JPY (¥)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 BDT (৳)	Dec. 31, 2019 VND (₫)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 RWF (FRw)	Dec. 31, 2019 MMK (K)	Dec. 31, 2019 BWP (P)	Dec. 31, 2019 HKD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2018 TZS (Tsh)	Dec. 31, 2018 XAF ( )	Dec. 31, 2018 USD ($)	Dec. 31, 2018 XDR ( )	Dec. 31, 2018 JPY (¥)	Dec. 31, 2018 EUR (€)	Dec. 31, 2018 BDT (৳)	Dec. 31, 2018 PLN (zł)	Dec. 31, 2018 VND (₫)	Dec. 31, 2018 DZD (دج)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2018 UZS ( )	Dec. 31, 2018 RWF (FRw)	Dec. 31, 2018 MMK (K)	Dec. 31, 2018 BWP (P)	Dec. 31, 2018 GBP (£)
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,476,853															₩ 11,000,665
Financial liabilities	₩ 14,597,106															₩ 16,128,644
Currency risk [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		Tsh 1,019	16,229	$ 6	$ 400,046	255	¥ 209,376	€ 316	zł 26	₫ 242,370	¥ 458	FRw 646	฿ 535	P 212			Tsh 6,919	97,411	$ 645,941	255	¥ 24,930	€ 1	৳ 18,897	₫ 271,563	¥ 457	FRw 706	K 84	P 911				666	$ 528,539	267	¥ 66,078	€ 2	৳ 39,494	zł 26	₫ 467,272	دج 618	¥ 1,954	121,053	FRw 857	K 84	P 897
Financial liabilities				$ 284,000	$ 1,937,935	728	¥ 46,000,009	€ 162			¥ 491				$ 198				$ 1,830,764	729	¥ 80,000,000	€ 6			¥ 161				$ 268	£ 56	Tsh 2,876		$ 1,893,849	730	¥ 50,000,000	€ 6					¥ 171					£ 256

XML

Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 10,731,034	₩ 10,873,266
Cash and cash equivalents (except for cash on hand) [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	2,625,581	2,226,608
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	5,034,621	5,784,228
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	1,118,619	1,256,266
Contract assets [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	586,438	557,041
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	7,684	58,576
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	680,453	541,657
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	6,570	7,086
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Maximum exposure to credit risk	₩ 671,068	₩ 441,804

XML

Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	₩ 7,576,809	₩ 9,324,730
Borrowings(including debentures)	8,205,838	8,216,212
Lease liabilities	1,143,640	1,211,352
Other non-derivative financial liabilities	131,816	196,475
Financial guarantee contracts	22,422	19,422
Total	17,122,317	19,064,221
Less than 1 year [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	6,587,796	8,149,445
Borrowings(including debentures)	1,573,944	1,304,936
Lease liabilities	336,024	397,609
Other non-derivative financial liabilities	574	1,749
Financial guarantee contracts	22,422	19,422
Total	8,520,760	9,873,161
1-5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	730,758	805,241
Borrowings(including debentures)	4,373,534	4,417,639
Lease liabilities	658,501	688,518
Other non-derivative financial liabilities	131,242	175,764
Financial guarantee contracts
Total	5,894,035	6,087,162
More than 5 years [member]
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]
Trade and other payables	258,255	370,044
Borrowings(including debentures)	2,258,360	2,493,637
Lease liabilities	190,907	221,255
Other non-derivative financial liabilities		18,962
Financial guarantee contracts
Total	₩ 2,707,522	₩ 3,103,898

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	₩ 2,925,965	₩ 2,760,957	₩ 2,439,559
Inflow	2,804,618	2,857,949	2,496,356
Less than 1 year [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	248,300	650,497	455,343
Inflow	249,301	684,720	484,505
1-5 years [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	2,179,046	1,602,513	1,466,915
Inflow	2,074,747	1,648,746	1,492,718
More than 5 years [member]
Disclosure of maturity analysis for derivative financial liabilities [Line Items]
Outflow	498,619	507,947	517,301
Inflow	₩ 480,570	₩ 524,483	₩ 519,133

XML

Financial Risk Management - Summary of Debt-to-equity Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [abstract]
Total liabilities	₩ 18,111,112	₩ 19,491,530
Total equity	₩ 15,551,433	₩ 15,140,684	₩ 14,658,490	₩ 13,183,354
Debt-to-equity ratio	116.00%	129.00%

XML

Financial Risk Management - Summary of Gearing Ratios (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [abstract]
Total borrowings	₩ 7,316,298	₩ 7,298,867
Less: cash and cash equivalents	(2,634,624)	(2,305,894)	₩ (2,703,422)	₩ (1,928,182)
Net debt	4,681,674	4,992,973
Total equity	15,551,433	15,140,684	₩ 14,658,490	₩ 13,183,354
Total capital	₩ 20,233,107	₩ 20,133,657
Gearing ratio	23.00%	25.00%

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, 2020	Dec. 31, 2019
Disclosure of offsetting of financial assets [line items]
Gross assets		₩ 85,058
Gross liabilities offset		(14)
Net amounts presented in the statement of financial position		85,044
Amounts not offset, Financial instruments		(82,130)
Amounts not offset, Cash collateral		0
Net amount		2,914
Trade receivables [member]
Disclosure of offsetting of financial assets [line items]
Gross assets	₩ 71,497	66,487
Gross liabilities offset	(1)	(1)
Net amounts presented in the statement of financial position	71,496	66,486
Amounts not offset, Financial instruments	(67,421)	(63,604)
Amounts not offset, Cash collateral	0	0
Net amount	₩ 4,075	2,882
Other Financial Assets1 [member]
Disclosure of offsetting of financial assets [line items]
Gross assets		18,571
Gross liabilities offset		(13)
Net amounts presented in the statement of financial position		18,558
Amounts not offset, Financial instruments		(18,526)
Amounts not offset, Cash collateral		0
Net amount		₩ 32

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, 2020	Dec. 31, 2019
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	₩ 69,362	₩ 84,178
Gross assets offset	(1)	(14)
Net amounts presented in the statement of financial position	69,361	84,164
Amounts not offset, Financial instruments	(67,421)	(82,130)
Amounts not offset, Cash collateral	0	0
Net amount	1,940	2,034
Trade payables [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	69,361	65,669
Gross assets offset		(13)
Net amounts presented in the statement of financial position	69,361	65,656
Amounts not offset, Financial instruments	(67,421)	(63,628)
Amounts not offset, Cash collateral	0	0
Net amount	1,940	2,028
Other [member]
Disclosure of offsetting of financial liabilities [Line Items]
Gross liabilities	1	18,509
Gross assets offset	(1)	(1)
Net amounts presented in the statement of financial position		18,508
Amounts not offset, Financial instruments		(18,502)
Amounts not offset, Cash collateral	₩ 0	0
Net amount		₩ 6

XML

Fair Value - Summary of Carrying Amount and Fair Value of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,476,853	₩ 11,000,665
Financial liabilities	14,597,106	16,128,644
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,017,639	8,679,698
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,316,298	7,298,867
Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	132,558	129,945
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2,682	38
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	127,929	20,096
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,634,624	2,305,894
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	4,976,423	5,748,459
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,118,619	1,256,266
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	671,068	441,804
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	809,919	632,324
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	258,516	557,342
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	7,684	58,576
Fair value [member] | Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
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	2,682	38
Fair value [member] | Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	127,929	20,096
Fair value [member] | Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,118,619	1,256,266
Fair value [member] | Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	809,919	632,324
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	258,516	557,342
Fair value [member] | Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 7,684	₩ 58,576

XML

Fair Value - Summary of Fair Value Non of Financial Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Non financial assets	₩ 4,840,220	₩ 4,809,091
Non financial liabilities	130,611	20,134
Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	52,055	6,970
Non financial liabilities	0
Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,659,385	1,942,555
Non financial liabilities	123,780	20,134
Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	3,128,780	2,859,566
Non financial liabilities	6,831	0
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	1,118,619	1,256,266
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		0
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	1,118,619	1,256,266
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		0
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	809,919	632,324
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	46,449	232
Non financial liabilities	0
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	330,961	136,951
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	432,509	495,141
Non financial liabilities		0
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	258,516	557,342
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	5,606	6,738
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	202,121	508,550
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	50,789	42,054
Derivative financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	7,684	58,576
Derivative financial assets for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	7,684	40,788
Derivative financial assets for hedging [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets		17,788
Investment Properties [member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	2,645,482	2,304,583
Investment Properties [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets		0
Investment Properties [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets		0
Investment Properties [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets	2,645,482	2,304,583
Other financial liabilities at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	2,682	38
Other financial liabilities at fair value through profit or loss [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	45	38
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	2,637
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	127,929	20,096
Derivative financial liabilities for hedging [member] | Level 1 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial assets		0
Non financial liabilities	0
Derivative financial liabilities for hedging [member] | Level 2 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	123,735	20,096
Derivative financial liabilities for hedging [member] | Level 3 [Member]
Disclosure of detailed information about financial instruments [line items]
Non financial liabilities	₩ 4,194	₩ 0

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, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 11,000,665
Ending balance	10,476,853	₩ 11,000,665
Beginning balance	16,128,644
Ending balance	14,597,106	16,128,644
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	632,324
Ending balance	809,919	632,324
Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Disposal		(9,734)
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	495,141
Purchases	374,259
Reclassification	208
Disposal	(451,663)	(485,419)
Amount recognized in profit or loss	14,564
Ending balance	432,509	495,141
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	17,788	(10,183)
Amount recognized in profit or loss		14,462
Amount recognized in other comprehensive income		13,509
Ending balance		17,788
Beginning balance	(17,788)
Amount recognized in profit or loss	29,345
Amount recognized in other comprehensive income	(7,363)
Ending balance	4,194	(17,788)
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		7,758
Amount recognized in profit or loss	(161)	1,976
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	495,141	163,600
Purchases		584,671
Reclassification		225,873
Amount recognized in profit or loss		6,416
Ending balance		495,141
Purchases	2,798
Ending balance	2,637
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	42,054	311,536
Purchases	13,142	6,081
Reclassification		(444,782)
Disposal	(571)	(941)
Amount recognized in profit or loss	(428)
Amount recognized in other comprehensive income	(3,408)	170,160
Ending balance	₩ 50,789	₩ 42,054

XML

Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Financial assets at fair value through other comprehensive income	₩ 258,516	₩ 557,342
Other financial assets
Financial assets at fair value through profit or loss	809,919	632,324
Derivative financial assets for hedging	7,684	58,576
Investment properties	1,368,453	1,387,430	₩ 1,091,084
Other financial liabilities
Financial liabilities at fair value through profit or loss	2,682	38
Derivative financial liabilities for hedging	127,929	20,096
Level 2 [Member]
Other financial assets
Derivative financial assets for hedging	₩ 7,684	₩ 58,576
Other financial liabilities
Valuation techniques	DCF Model
Valuation techniques		DCF Model
Level 2 [Member] | Financial assets at fair value through profit or loss [member]
Other financial liabilities
Valuation techniques		DCF Model
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member]
Other financial liabilities
Valuation techniques	DCF Model	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	₩ 1,118,619	₩ 1,256,266
Level 2, 3 [Member]
Other financial liabilities
Derivative financial liabilities for hedging	₩ 127,929	20,096
Valuation techniques	Hull-White model, DCF Model
Level 2, 3 [Member] | Financial assets at fair value through profit or loss [member]
Other financial assets
Financial assets at fair value through profit or loss	₩ 763,470	₩ 632,092
Other financial liabilities
Valuation techniques	DCF Model, Adjusted net asset model	DCF Model, Adjusted net asset model
Valuation techniques	DCF Model, Binomial Option Pricing
Level 2, 3 [Member] | Financial assets at fair value through other comprehensive income [member]
Assets
Financial assets at fair value through other comprehensive income	₩ 252,910	₩ 550,604
Other financial liabilities
Valuation techniques	DCF Model, Comparable Company Analysis	DCF Model, Comparable Company Analysis
Level 3 [Member]
Other financial assets
Investment properties	₩ 2,645,482	₩ 2,304,583
Other financial liabilities
Valuation techniques	DCF Model	DCF Model
Level 3 [Member] | Financial assets at fair value through profit or loss [member]
Other financial liabilities
Financial liabilities at fair value through profit or loss	₩ 2,682	₩ 38

XML

Fair Value - Summary of Details and Changes of Total Deferred Difference (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Beginning balance	₩ 11,000,665
Recognized at fair value through profit or loss	(809,919)	₩ (632,324)
Ending balance	10,476,853	11,000,665
Beginning balance	16,128,644
Recognized at fair value through profit or loss	2,682	38
Ending balance	14,597,106	16,128,644
Derivatives held for trading [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	0	(2,824)
New transactions	0	0
Recognized at fair value through profit or loss	0	2,824
Ending balance	0	0
Derivatives used for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Beginning balance	3,682	5,107
New transactions	0	0
Recognized at fair value through profit or loss		(1,425)
Ending balance	₩ 2,257	₩ 3,682

XML

Interests in Unconsolidated Structured Entities - Summary of Unconsolidated Structured Entities and Nature of Risks (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of unconsolidated structured entities [line items]
Other financial assets	₩ 1,747,187	₩ 1,690,046
Joint ventures and associates	557,881	267,660
Real Estate Finance [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	2,004,869	1,595,895
Other financial assets	29,874	15,816
Joint ventures and associates	51,607	8,542
Total	81,481	24,358
Maximum loss exposure Investment assets	81,481	24,358
PEF &Investment Fund [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	4,380,534	4,060,992
Other financial assets	128,332	100,496
Joint ventures and associates	219,753	192,022
Total	348,085	292,518
Maximum loss exposure Investment assets	348,085	292,518
Cash deficiency support	29,130
Asset Securitization [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	2,152,412	2,562,931
Unconsolidated structured entities [member]
Disclosure of unconsolidated structured entities [line items]
Total assets of unconsolidated structured entities	8,537,815	8,219,818
Other financial assets	158,206	116,312
Joint ventures and associates	271,360	200,564
Total	429,566	316,876
Maximum loss exposure Investment assets	429,566	₩ 316,876
Cash deficiency support	₩ 29,130

XML

Information About Non-controlling Interests - Summary of Changes in Accumulated Non-controlling Interests (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of subsidiaries [line items]
Accumulated non-controlling interests at the beginning of the year	₩ 1,520,160
Profit or loss allocated to non-controlling interests	45,367	₩ 50,165	₩ 73,841
Accumulated non-controlling interests at the end of the year	₩ 1,539,989	₩ 1,520,160
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	49.70%	49.70%	49.70%
Accumulated non-controlling interests at the beginning of the year	₩ 375,906	₩ 374,150	₩ 328,302
Profit or loss allocated to non-controlling interests	22,171	10,029	23,405
Dividend paid to non-controlling interests	(8,279)	(8,279)	(8,279)
Others	(898)	6	30,722
Accumulated non-controlling interests at the end of the year	₩ 388,900	₩ 375,906	₩ 374,150
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	30.50%	30.50%	30.50%
Accumulated non-controlling interests at the beginning of the year	₩ 417,475	₩ 345,547	₩ 339,067
Profit or loss allocated to non-controlling interests	9,899	37,795	28,418
Dividend paid to non-controlling interests	(22,787)	(18,900)	(35,924)
Others	7,239	53,033	13,986
Accumulated non-controlling interests at the end of the year	₩ 411,826	₩ 417,475	₩ 345,547
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	55.20%	55.20%	55.20%
Accumulated non-controlling interests at the beginning of the year	₩ 54,276	₩ 52,865	₩ 53,053
Profit or loss allocated to non-controlling interests	2,151	1,751	(3,058)
Dividend paid to non-controlling interests	(478)
Others	(202)	(340)	2,870
Accumulated non-controlling interests at the end of the year	₩ 55,747	₩ 54,276	₩ 52,865
KT Hitel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	32.90%	32.90%	32.90%
Accumulated non-controlling interests at the beginning of the year	₩ 54,709	₩ 52,336	₩ 53,146
Profit or loss allocated to non-controlling interests	(1,840)	1,720	454
Others	(2,563)	653	(1,264)
Accumulated non-controlling interests at the end of the year	₩ 50,306	₩ 54,709	₩ 52,336
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate(%)	13.20%	13.20%	13.20%
Accumulated non-controlling interests at the beginning of the year	₩ 3,650	₩ 103,357	₩ 103,468
Profit or loss allocated to non-controlling interests	152	(588)	59
Others	(208)	(99,119)	(170)
Accumulated non-controlling interests at the end of the year	₩ 3,594	₩ 3,650	₩ 103,357

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Information About Non-controlling Interests - Summary of Financial Information on Subsidiaries (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of subsidiaries [line items]
Current assets	₩ 11,154,180	₩ 11,975,659
Non-current assets	22,508,365	22,656,555
Current liabilities	9,192,472	10,148,054
Non-current liabilities	8,918,640	9,343,476
Equity	15,551,433	15,140,684	₩ 14,658,490	₩ 13,183,354
Operating revenue	24,440,647	24,899,189	23,436,050
Profit or loss for the year	746,256	695,868	719,412
Total comprehensive income (loss)	769,511	868,206	664,784
Cash flows from operating activities	4,739,827	3,745,173	4,010,464
Cash flows from investing activities	(3,761,470)	(3,887,472)	(2,704,130)
Cash flows from financing activities	(647,585)	(249,748)	(531,675)
Net (decrease)/increase in cash and cash equivalents	328,730	(397,528)	775,240
Cash and cash equivalents at beginning of year	2,305,894	2,703,422	1,928,182
Exchange differences	(2,042)	(5,481)	581
Cash and cash equivalents at end of year	₩ 2,634,624	₩ 2,305,894	₩ 2,703,422
KT Skylife Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	49.70%	49.70%	49.70%
Current assets	₩ 480,450	₩ 459,077	₩ 301,739
Non-current assets	439,026	389,199	514,263
Current liabilities	153,236	123,506	112,411
Non-current liabilities	21,803	19,333	37,430
Equity	744,437	705,437	666,161
Operating revenue	706,631	704,996	694,059
Profit or loss for the year	58,190	56,008	52,010
Total comprehensive income (loss)	55,647	55,936	47,787
Cash flows from operating activities	160,934	152,549	183,474
Cash flows from investing activities	(105,293)	(101,594)	(139,846)
Cash flows from financing activities	(19,650)	(18,833)	(77,647)
Net (decrease)/increase in cash and cash equivalents	35,991	32,122	(34,019)
Cash and cash equivalents at beginning of year	63,850	31,728	65,747
Exchange differences	(7)	0
Cash and cash equivalents at end of year	₩ 99,834	₩ 63,850	₩ 31,728
BC Card Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	30.50%	30.50%	30.50%
Current assets	₩ 1,785,914	₩ 2,580,634	₩ 2,997,429
Non-current assets	1,298,484	1,332,348	724,950
Current liabilities	1,602,667	2,452,219	2,520,050
Non-current liabilities	176,083	142,013	110,486
Equity	1,305,648	1,318,750	1,091,843
Operating revenue	3,387,640	3,553,008	3,551,715
Profit or loss for the year	39,455	115,885	70,889
Total comprehensive income (loss)	61,796	289,122	116,604
Cash flows from operating activities	(119,163)	429,331	86,299
Cash flows from investing activities	58,042	(419,894)	128,538
Cash flows from financing activities	22,790	(5,744)	(117,561)
Net (decrease)/increase in cash and cash equivalents	(38,331)	3,693	97,276
Cash and cash equivalents at beginning of year	279,162	275,089	177,826
Exchange differences	(247)	380	(13)
Cash and cash equivalents at end of year	₩ 240,584	₩ 279,162	₩ 275,089
KT Powertel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	55.20%	55.20%	55.20%
Current assets	₩ 90,056	₩ 86,465	₩ 84,785
Non-current assets	29,638	31,587	39,279
Current liabilities	17,045	17,757	27,187
Non-current liabilities	1,788	2,009	1,030
Equity	100,861	98,286	95,847
Operating revenue	65,897	62,846	65,620
Profit or loss for the year	3,809	3,085	(5,545)
Total comprehensive income (loss)	3,442	2,469	(5,792)
Cash flows from operating activities	6,011	780	11,603
Cash flows from investing activities	(3,353)	(9,525)	(2,580)
Cash flows from financing activities	(1,515)	(687)
Net (decrease)/increase in cash and cash equivalents	1,143	(9,432)	9,023
Cash and cash equivalents at beginning of year	6,217	15,649	6,626
Exchange differences	0	0
Cash and cash equivalents at end of year	₩ 7,360	₩ 6,217	₩ 15,649
KT Hitel Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	32.90%	32.90%	32.90%
Current assets	₩ 140,948	₩ 115,694	₩ 161,162
Non-current assets	148,001	164,124	111,546
Current liabilities	74,045	62,378	63,231
Non-current liabilities	18,554	12,391	2,812
Equity	196,350	205,049	206,665
Operating revenue	350,231	323,065	279,117
Profit or loss for the year	2,080	1,426	657
Total comprehensive income (loss)	(8,700)	(1,840)	738
Cash flows from operating activities	62,521	49,870	43,855
Cash flows from investing activities	(58,186)	(50,138)	(26,335)
Cash flows from financing activities	(1,856)	(1,860)
Net (decrease)/increase in cash and cash equivalents	2,479	(2,128)	17,520
Cash and cash equivalents at beginning of year	37,043	39,186	21,647
Exchange differences	(83)	(15)	19
Cash and cash equivalents at end of year	₩ 39,439	₩ 37,043	₩ 39,186
KT Telecop Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Non-controlling Interests rate (%)	13.20%	13.20%	13.20%
Current assets	₩ 79,076	₩ 55,908	₩ 52,367
Non-current assets	239,380	223,969	220,125
Current liabilities	136,565	64,218	85,648
Non-current liabilities	57,172	89,622	54,666
Equity	124,719	126,037	132,178
Operating revenue	392,489	332,063	328,262
Profit or loss for the year	212	(4,875)	166
Total comprehensive income (loss)	(1,319)	(6,558)	(1,517)
Cash flows from operating activities	35,834	52,693	40,351
Cash flows from investing activities	(57,976)	(44,393)	(76,969)
Cash flows from financing activities	14,652	(5,227)	10,000
Net (decrease)/increase in cash and cash equivalents	(7,490)	3,073	(26,618)
Cash and cash equivalents at beginning of year	8,781	5,708	32,326
Exchange differences	0	0
Cash and cash equivalents at end of year	₩ 1,291	₩ 8,781	₩ 5,708

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of subsidiaries [abstract]
Carrying amount of non-controlling interests acquired	₩ 1,750	₩ (9,566)	₩ (194)
Consideration paid to non-controlling interests	9,878	484	11,312
Excess of consideration paid recognized in parent's equity	₩ 11,628	₩ (9,082)	₩ 11,118

XML

Business Combination - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Apr. 30, 2020
Disclosure of detailed information about business combination [Line Items]
identifiable intangible assets generated	₩ 410
Goodwill generated	407
operating income of combined entity	250,380
net loss of combined entity	1,948
operating income	387,697
net loss	8,461
KT Engineering Co Ltd [Member]
Disclosure of detailed information about business combination [Line Items]
Number of shares acquired		1,400,000
Percentage of ownership interest		59.80%
KT Estate [Member]
Disclosure of detailed information about business combination [Line Items]
Number of shares acquired		940,000
Percentage of ownership interest		40.20%
Business combinations [member]
Disclosure of detailed information about business combination [Line Items]
identifiable intangible assets generated	3
Goodwill generated	₩ 407

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, 2020 KRW (₩)
Disclosure of detailed information about business combination [Line Items]
Total transfer cost (a)	₩ 46,800
Recognized amount of assets acquired and liabilities assumed (b)	46,393
Cash and cash equivalents	57,845
Trade and other receivables	95,814
Other financial assets	3,110
Other assets	14,021
Inventories	1,521
Property and equipment	3,128
Intangible assets	410
Trade and other payables	(105,964)
Other liabilities	(4,815)
Current income tax liabilities	(3,664)
Other provisions	(13,745)
Retirement benefit liabilities	(1,268)
Goodwill	₩ 407

XML

Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty - Summary of Impact on Consolidated Financial Statements Due to Application of accounting policy (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Prepaid expenses	₩ 66,578	₩ 84,768
Non-current assets
Right-of-use assets	1,217,179	1,268,329
Current liabilities
Lease liabilities		392,433
Non-current liabilities
Lease liabilities		818,919
Total liabilities	18,111,112	19,491,530
Retained earnings	12,155,420	11,590,916
Total equity	15,551,433	15,140,684	₩ 14,658,490	₩ 13,183,354
Operating revenue	24,440,647	24,899,189	23,436,050
Operating expenses	23,418,314	23,872,219	22,335,190
Finance income	498,614	424,395	374,243
Financial costs	507,383	432,133	435,659
Income tax expense	285,349	320,060	314,565
Profit for the year	₩ 746,256	₩ 695,868	₩ 719,412
Basic earnings per share	₩ 2,858	₩ 2,634	₩ 2,634
Diluted earnings per share	₩ 2,858	₩ 2,632	₩ 2,634
Adjustment on Accounting policy
Current assets
Prepaid expenses	₩ (2,119)	₩ (1,026)
Non-current assets
Right-of-use assets	632,145	479,832
Current liabilities
Lease liabilities	63,263	36,600
Non-current liabilities
Lease liabilities	566,532	445,612
Total liabilities	629,795	482,212
Retained earnings	232	(3,406)
Total equity	232	(3,406)
Operating revenue	5,796
Operating expenses	(7,063)	(6,796)
Financial costs	9,222	10,202
Profit for the year	₩ 3,637	₩ (3,406)
Basic earnings per share	₩ 15	₩ (14)
Diluted earnings per share	₩ 18	₩ (14)
Previously stated [member]
Current assets
Prepaid expenses	₩ 61,930	₩ 76,036
Non-current assets
Right-of-use assets	585,034	788,497
Current liabilities
Lease liabilities	281,961	355,833
Non-current liabilities
Lease liabilities	798,416	373,307
Total liabilities	513,845	729,140
Retained earnings	12,155,188	11,594,322
Total equity	12,155,188	11,594,322
Operating revenue	24,434,851	24,899,189
Operating expenses	23,425,377	23,879,015
Finance income	498,614	424,395
Financial costs	498,161	421,931
Income tax expense	285,349	320,060
Profit for the year	₩ 742,619	₩ 699,274
Basic earnings per share	₩ 2,843	₩ 2,648
Diluted earnings per share	₩ 2,840	₩ 2,646
Adjustment on Accounting policy
Current assets
Prepaid expenses	₩ 59,811	₩ 75,010
Non-current assets
Right-of-use assets	1,217,179	1,268,329
Current liabilities
Lease liabilities	345,224	392,433
Non-current liabilities
Lease liabilities	798,416	818,919
Total liabilities	1,143,640	1,211,352
Retained earnings	12,155,420	11,590,916
Total equity	12,155,420	11,590,916
Operating revenue	24,440,647	24,899,189
Operating expenses	23,418,314	23,872,219
Finance income	498,614	424,395
Financial costs	507,383	432,133
Income tax expense	285,349	320,060
Profit for the year	₩ 746,256	₩ 695,868
Basic earnings per share	₩ 2,858	₩ 2,634
Diluted earnings per share	₩ 2,858	₩ 2,632

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Changes in Accounting Policies - Determination of Lease Term Considering Economic Penalty - Additional Information (Detail) ₩ in Millions	Jan. 01, 2019 KRW (₩)
Increase (decrease) due to changes in accounting policy [member]
Disclosure of reclassifications or changes in presentation [line items]
Increase (decrease) through changes in accounting policy, right of use assets	₩ 128,035
Increase (decrease) through changes in accounting policy, lease liabilities	128,035
IFRS 16 [Member]
Disclosure of reclassifications or changes in presentation [line items]
Increase (decrease) through changes in accounting policy, right of use assets	899,783
Increase (decrease) through changes in accounting policy, lease liabilities	₩ 643,375

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Events after Reporting Period - Summary of Public Bonds Issued After Reporting Period (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2020 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items]
Interest rate	0.00%
Redemption date	Jun. 5, 2025
Gross carrying amount [member] | The 194-1st Public bond, January Twenty six, twenty twenty four [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 27, 2021
Carrying amount	₩ 130,000
Interest rate	1.13%
Redemption date	Jan. 26, 2024
Gross carrying amount [member] | The 194-2nd Public bond, January twenty seven, twenty twenty six [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 27, 2021
Carrying amount	₩ 140,000
Interest rate	1.45%
Redemption date	Jan. 27, 2026
Gross carrying amount [member] | The194-3rd Public bond, January twenty seven, twenty thirty one [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 27, 2021
Carrying amount	₩ 50,000
Interest rate	1.85%
Redemption date	Jan. 27, 2031
Gross carrying amount [member] | The194-4th Public bond, January twenty five, twenty forty one [member]
Disclosure of non-adjusting events after reporting period [line items]
Issue date	Jan. 27, 2021
Carrying amount	₩ 80,000
Interest rate	1.98%
Redemption date	Jan. 25, 2041