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Financial risk management - Concentration by geographic location for financial instrument, net of allowance (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | ₩ 715,198,707 | ₩ 692,184,971
Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 501,633,507 | 487,523,988
Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,658,709 | 14,058,051
Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 208,308,298 | 199,809,576
Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,417,332 | 27,228,308
Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 226,554,125 | 218,713,457
Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 27,695,043 | 27,714,596
Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,456,116 | 1,915,396
Deposits and loans at FVTPL | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 169,972 | 134,609
Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,286,144 | 1,780,787
Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 71,727,860 | 67,134,121
Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,153,950 | 10,279,257
Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 101,282,906 | 92,016,210
Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 31,944,368 | 33,315,999
Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,221,968 | 22,509,195
Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 220,317,053 | 218,980,794
Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 246,539,021 | 241,489,989
Korea |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 623,940,412 | 613,818,760
Korea | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 434,311,622 | 429,699,348
Korea | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,934,110 | 6,303,730
Korea | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 192,492,848 | 185,102,271
Korea | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 15,993,867 | 21,716,534
Korea | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 193,530,841 | 189,219,966
Korea | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 27,359,956 | 27,356,847
Korea | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,264,493 | 1,556,383
Korea | Deposits and loans at FVTPL | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 129,110 | 99,159
Korea | Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,135,383 | 1,457,224
Korea | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 65,274,393 | 61,955,771
Korea | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,776,528 | 8,199,726
Korea | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 87,212,394 | 81,294,290
Korea | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 30,100,982 | 31,113,242
Korea | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 23,442,408 | 20,517,889
Korea | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 210,218,685 | 206,833,657
Korea | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 233,661,093 | 227,351,546
USA |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 24,508,607 | 17,808,654
USA | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,872,054 | 8,025,048
USA | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,409,928 | 1,284,361
USA | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 595,218 | 506,525
USA | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,354,336 | 1,018,284
USA | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,498,636 | 5,203,409
USA | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 13,936 | 12,469
USA | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 124,116 | 198,961
USA | Deposits and loans at FVTPL | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 40,862 | 35,450
USA | Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 83,254 | 163,511
USA | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,720,780 | 3,321,700
USA | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 480,953 | 687,950
USA | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,104,105 | 5,367,178
USA | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 206,599 | 207,817
USA | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 802,192 | 579,426
USA | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,546,770 | 1,873,831
USA | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,348,962 | 2,453,257
UK |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,455,758 | 2,281,763
UK | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,788,203 | 1,421,880
UK | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 479,051 | 624,468
UK | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 8,021 | 7,064
UK | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,300,654 | 789,820
UK | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 477 | 528
UK | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 | 0
UK | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 861,745 | 377,462
UK | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 17,518 | 41,218
UK | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 788,292 | 441,203
UK | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 273,331 | 250,938
UK | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 270,460 | 290,909
UK | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 543,791 | 541,847
Japan |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 17,605,115 | 15,860,495
Japan | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 16,086,649 | 14,492,721
Japan | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 278,851 | 334,073
Japan | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,464,414 | 5,165,687
Japan | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,137,190 | 1,914,100
Japan | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 8,202,921 | 7,075,869
Japan | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,273 | 2,992
Japan | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 14,424 | 15,402
Japan | Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 14,424 | 15,402
Japan | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 147,328 | 135,194
Japan | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 153,496 | 152,555
Japan | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 771,151 | 564,635
Japan | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 432,067 | 499,988
Japan | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 38,669 | 44,186
Japan | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 572,774 | 352,256
Japan | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 611,443 | 396,442
Germany |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 987,764 | 1,086,152
Germany | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 751,357 | 773,776
Germany | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 363,081 | 354,583
Germany | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,807 | 3,399
Germany | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 178,022 | 197,042
Germany | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 206,108 | 218,422
Germany | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 339 | 330
Germany | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 | 0
Germany | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,399 | 2,564
Germany | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 112,892 | 274,786
Germany | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 116,116 | 35,026
Germany | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 26,576 | 9,663
Germany | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 126,187 | 87,212
Germany | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 152,763 | 96,875
Vietnam |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 11,891,042 | 11,650,601
Vietnam | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 11,359,951 | 10,830,453
Vietnam | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 933,820 | 1,295,863
Vietnam | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 5,054,569 | 4,391,692
Vietnam | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 403,760 | 334,366
Vietnam | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,729,918 | 4,533,648
Vietnam | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 237,884 | 274,884
Vietnam | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,133 | 5,193
Vietnam | Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,133 | 5,193
Vietnam | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 12,012 |
Vietnam | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 6,618 | 3,201
Vietnam | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 42,978 | 50,368
Vietnam | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 465,350 | 761,386
Vietnam | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 202,498 | 199,535
Vietnam | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,387,567 | 2,187,736
Vietnam | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,590,065 | 2,387,271
China |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,621,490 | 7,999,221
China | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 6,726,046 | 7,164,953
China | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,078,467 | 1,633,954
China | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,817,292 | 2,002,467
China | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 303,764 | 360,451
China | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,476,094 | 3,125,771
China | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 50,429 | 42,310
China | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 0 | 0
China | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 11,839 | 7,144
China | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 7,791 | 1,613
China | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 779,447 | 708,567
China | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 96,367 | 116,944
China | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 734,356 | 511,891
China | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,064,500 | 2,158,798
China | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,798,856 | 2,670,689
Other |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 25,188,519 | 21,679,325
Other | Due from banks and loans at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 17,737,625 | 15,115,809
Other | Due from banks and loans at amortized cost | Banks |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 3,181,401 | 2,227,019
Other | Due from banks and loans at amortized cost | Retail |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,872,129 | 2,630,471
Other | Due from banks and loans at amortized cost | Government/Public sector/ Central bank |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 2,046,393 | 1,687,531
Other | Due from banks and loans at amortized cost | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 9,608,953 | 8,546,552
Other | Due from banks and loans at amortized cost | Card receivable |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 28,749 | 24,236
Other | Deposits and loans at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 48,950 | 139,457
Other | Deposits and loans at FVTPL | Corporations |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 48,950 | 139,457
Other | Securities at FVTPL |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 1,692,364 | 1,334,286
Other | Derivative assets |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 598,154 | 918,208
Other | Securities at FVOCI |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,468,423 | 3,554,943
Other | Securities at amortized cost |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 643,003 | 616,622
Other | Guarantees |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 701,938 | 395,667
Other | Loan commitments and other liabilities related to credit |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | 4,130,110 | 5,196,395
Other | Total |  |
Concentration by geographic location for financial instrument, net of allowance [Line Items] |  |
Financial assets, net | ₩ 4,832,048 | ₩ 5,592,062

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