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Operating Expenses
 12 Months Ended
Dec. 31, 2025
Analysis of income and expense [abstract]  
Operating Expenses Operating Expenses
(1)    Operating expenses for the years ended December 31, 2023, 2024 and 2025, are as follows:
(in millions of Korean won)202320242025
Employee benefit cost₩4,556,832 ₩5,628,058 ₩4,592,773 
Depreciation2,723,610 2,827,518 2,849,519 
Depreciation of right-of-use assets402,737 410,925 430,977 
Amortization of intangible assets683,784 639,268 599,700 
Commissions1,264,729 1,403,381 1,587,845 
Interconnection charges436,598 410,872 397,239 
International interconnection fee140,433 138,807 129,330 
Purchase of inventories3,595,345 3,526,723 3,668,466 
Changes of inventories(203,071)(27,947)549,841 
Sales commission2,353,318 2,258,121 2,599,589 
Service cost1,2
2,229,709 2,141,856 2,445,981 
Utilities544,675 555,856 571,127 
Taxes and dues250,651 265,305 267,932 
Rent167,576 147,607 153,584 
Insurance premium66,737 68,443 68,383 
Installation fee174,238 164,969 172,887 
Advertising expenses153,750 169,189 168,768 
Allowance for bad debts150,549 151,486 121,010 
Card service cost3,189,376 3,009,170 2,793,707 
Loss on disposal of property and equipment72,710 90,373 51,655 
Loss on disposal of intangible assets5,328 9,713 8,955 
Loss on disposal of right-of-use assets2,115 2,578 2,814 
Loss on disposal of investments in associates— 17 1,753 
Loss on disposal of investments in subsidiaries— 7,998 6,564 
Impairment loss on property and equipment7,871 7,183 15,317 
Impairment loss on intangible assets236,206 239,312 43,132 
Donations24,664 9,499 14,479 
Other allowance for bad debts34,112 26,475 19,770 
Others2
1,902,214 1,801,660 1,686,153 
Total₩25,166,796 ₩26,084,415 ₩26,019,250 
1Service cost is mainly related to purchase of service for system implementation and contents service.
2As of December 31, 2025, the amounts include salaries and wages of ₩125,060 million(2023: ₩104,828 million, 2024: ₩109,464 million) depreciation of ₩23,643 million(2023:₩28,801 million , 2024: ₩23,267 million) and amortization of intangible assets of ₩9,847 million(2023: ₩4,858 million, 2024: ₩12,443 million).

(2)    Details of employee benefit cost for the years ended December 31, 2023, 2024 and 2025, are as follows:
(in millions of Korean won)202320242025
Salaries & Wages₩4,231,781 ₩4,275,944 ₩4,272,048 
Post-employment benefits(Defined benefit plan)183,026 221,377 219,220 
Post-employment benefits(Defined contribution plan)85,174 86,723 84,334 
Share-based payment15,450 7,129 11,894 
Others41,401 1,036,885 5,277 
Total₩4,556,832 ₩5,628,058 ₩4,592,773