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Transactions between related parties (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Associates      
Disclosure of transactions between related parties [Line Items]      
Electricity sales ₩ 220,801 ₩ 200,574 ₩ 144,751
Service sales 53,838 33,727 31,936
Design service 19,321 14,295 15,197
Dividend paid 0 0 0
Commission 0 0 0
Technical fee 0 0 0
Construction revenue 0 0 0
Interest income 0 0 0
Interest expense 0 0 0
Electricity purchase 2,584,539 2,752,321 2,873,781
Purchase of power generation fuel 3,270,972 4,049,486 5,191,243
REC purchase 14,317 26,843 22,482
Service purchase 1,151 2,060 1,006
Rental fee and others 0 0 0
Electricity metering service fee 212,366 245,057 261,668
Trading fees 87,361 120,509 137,489
Woodchip purchase 0 0 440
Electricity sales and others 66,755 98,450 60,318
Electricity purchase and Others 0 0 31
Outstanding balances for related party transactions [Abstract]      
Trade receivables 19,718 13,446 13,005
Trade payables 689,395 806,024 862,594
Non-trade receivables and others 33,410 14,659 8,482
Non-trade payables and others 140,964 77,246 78,129
Accrued interest income 0 0 0
Derivative assets 0 0 0
Derivative liabilities 0 0 0
Dongducheon Dream Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 7,757 7,071 6,093
Electricity purchase 552,692 689,510 828,547
Outstanding balances for related party transactions [Abstract]      
Trade receivables 388 323  
Trade payables 65,794 85,920  
Non-trade receivables and others 213 267  
Non-trade payables and others 0 12  
Korea Gas Corporation      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 97,685 116,484 99,933
Purchase of power generation fuel 3,270,972 4,049,486 5,191,243
Outstanding balances for related party transactions [Abstract]      
Trade receivables 9,969 9,267  
Trade payables 428,763 462,138  
Non-trade receivables and others 95 38  
Non-trade payables and others 617 560  
Daejung Offshore Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 32 1 1
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 31 0  
Daegu Photovoltaic Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 325 327 128
REC purchase 3,313 3,626 3,745
Outstanding balances for related party transactions [Abstract]      
Trade payables 57 69  
Haeng Bok Do Si Photovoltaic Power Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 2 2 2
REC purchase 370 450 455
Korea Electric Power Industrial Development Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 10,833 11,085 10,422
Electricity metering service fee 212,366 245,057 261,668
Outstanding balances for related party transactions [Abstract]      
Trade receivables 508 243  
Trade payables 133 3,756  
Non-trade receivables and others 16 43  
Non-trade payables and others 3,779 3,827  
Goseong Green Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 47,701 19,245 10,024
Electricity purchase 0 32 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 2,181 103  
Non-trade receivables and others 9,214 5,285  
Non-trade payables and others 64,986 65,626  
Gangneung Eco Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 10,178 7,446 4,928
Service purchase 0 0 19
Outstanding balances for related party transactions [Abstract]      
Trade receivables 661 115  
Non-trade receivables and others 146 65  
Shin Pyeongtaek Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 20,791 21,218 8,468
Electricity purchase 520,737 119,162 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 1,348 1,013  
Trade payables 47,948 64,696  
Non-trade receivables and others 2,823 2,281  
Non-trade payables and others 85 61  
Noeul Green Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 30 30 30
REC purchase 10,634 22,767 18,282
Outstanding balances for related party transactions [Abstract]      
Trade receivables 3 3  
Non-trade receivables and others 969 0  
Non-trade payables and others 0 1,855  
Samcheok Eco Materials Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 700 627 605
Electricity purchase 10,713 9,425 3,819
Outstanding balances for related party transactions [Abstract]      
Trade receivables 47 59  
YTN Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,805 2,257 2,043
Electricity purchase 353    
Service purchase 353 333 322
Outstanding balances for related party transactions [Abstract]      
Trade receivables 97 97  
Busan Green Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 34 18 19
Electricity purchase 18,678 13,811 25,123
Outstanding balances for related party transactions [Abstract]      
Trade receivables 5 1  
Non-trade receivables and others 13,946 0  
Non-trade payables and others 0 606  
Gunsan Bio Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 102 4,755 3,611
Electricity purchase 24 3,022 0
Korea Electric Vehicle Charging Service      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,956 1,029 578
Service purchase 581 536 605
Outstanding balances for related party transactions [Abstract]      
Trade receivables 141 137  
Non-trade receivables and others 281 529  
Tamra Offshore Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 0 0 58
Electricity purchase 0 0 8,371
Daegu clean Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 0 0 126
Yaksu ESS Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service purchase 217 1,191 0
Outstanding balances for related party transactions [Abstract]      
Trade payables 739 525  
Gangwon Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 2,109 2,433 2,402
Electricity purchase 23,350 24,116 25,407
Outstanding balances for related party transactions [Abstract]      
Trade receivables 6 7  
Trade payables 2,678 2,979  
Gwangyang Green Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 23 122 874
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 1,356 1,334  
Bigeum Resident Photovoltaic Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 85    
Hyundai Green Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Design service 17,257 13,106 14,031
Electricity purchase 349,778 507,662 480,815
Outstanding balances for related party transactions [Abstract]      
Trade receivables 554 502  
Trade payables 9,825 41,587  
Korea Power Exchange      
Disclosure of transactions between related parties [Line Items]      
Service sales 25,919 7,670 6,854
Trading fees 87,361 120,509 137,489
Outstanding balances for related party transactions [Abstract]      
Trade receivables 1,608 1,142  
Trade payables 1,362    
Non-trade receivables and others 24 144  
Non-trade payables and others 70,456 4,160  
Ecollite Co., Ltd.      
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 0 210  
Taebaek Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 226 991 614
Electricity purchase 4,003 7,070 8,582
Outstanding balances for related party transactions [Abstract]      
Trade payables 443 358  
Non-trade receivables and others 1,405    
Non-trade payables and others 0 243  
Taeback Guinemi Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 37 77 0
Electricity purchase 5,023 349 0
Outstanding balances for related party transactions [Abstract]      
Trade payables 413 190  
Non-trade receivables and others 0 2  
Non-trade payables and others 509 0  
Pyeongchang Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Design service 2,064 1,189 1,166
Electricity purchase 3,969 5,188 6,994
Outstanding balances for related party transactions [Abstract]      
Trade receivables 3 4  
Daeryun Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,947 1,879 1,731
Electricity purchase 99,523 144,862 184,063
Outstanding balances for related party transactions [Abstract]      
Trade receivables 189 144  
Trade payables 16,079 19,843  
Changjuk Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 2,067 927 758
Electricity purchase 6,084 6,994 7,929
Outstanding balances for related party transactions [Abstract]      
Trade payables 461 447  
Non-trade payables and others 309 280  
GS Donghae Electric Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 31,557 15,792 7,238
Electricity purchase 660,351 681,379 780,233
Outstanding balances for related party transactions [Abstract]      
Trade receivables 386 175  
Trade payables 91,213 69,811  
Non-trade receivables and others 321 367  
Non-trade payables and others 36 16  
KNH Solar Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 16 17 17
Electricity purchase 3,564 3,377 3,586
Outstanding balances for related party transactions [Abstract]      
Trade receivables 1 1  
Trade payables 14    
Non-trade payables and others 187 0  
S-Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 6,682 6,535 9,118
Electricity purchase 293,515 522,469 507,875
Outstanding balances for related party transactions [Abstract]      
Trade receivables 137 89  
Trade payables 23,415 53,705  
Non-trade receivables and others 46 43  
Hadong Mineral Fiber Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service purchase 0 0 60
Green Biomass Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Woodchip purchase 0 0 440
PND solar Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 409 407 12
Electricity purchase 5,234 557 0
Outstanding balances for related party transactions [Abstract]      
Trade payables 58 0  
Hyundai Ecoenergy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 167 117 0
Electricity purchase 17,777 6,810 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 16 16  
YeongGwang Yaksu Wind Electric Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 77 81 0
Electricity purchase 9,151 6,511 2,437
Outstanding balances for related party transactions [Abstract]      
Trade receivables 8 5  
Korea Energy Solution Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 7 52 0
Electricity purchase 0 15 0
Gwangbaek Solar Power Investment Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity purchase 373    
Green Energy Electricity Generation Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 14    
Namjeongsusang Solar Power Operation Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 14    
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 291    
Muan Solar Park Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 57    
Outstanding balances for related party transactions [Abstract]      
Trade receivables 24    
Go deok Clean Energy Co., Ltd      
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 1    
Suwon New Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 2,974 5,606 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 2    
Non-trade receivables and others 712 2,939  
Muan Sunshine Solar Power Plant Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 30    
6 Associates (Overseas)      
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 3,248 1,112  
9 Associates (Overseas)      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 0    
Electricity sales and others 66,755 98,450 60,318
Electricity purchase and Others 0 0 31
Joint ventures      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 9,853 8,608 6,740
Service sales 26,623 18,168 16,999
Design service 0 0 0
Dividend paid 0 0 0
Commission 476 504 648
Technical fee 33 4 3,424
Construction revenue 14 354 568
Interest income 0 0 0
Interest expense 0 0 0
Electricity purchase 691,707 726,884 662,290
Purchase of power generation fuel 0 0 0
REC purchase 9,768 10,910 11,414
Service purchase 221,604 144,787 80,088
Rental fee and others 0 0 0
Electricity metering service fee 0 0 0
Trading fees 0 0 0
Woodchip purchase 0 0 0
Electricity sales and others 831,596 1,275,279 206,054
Electricity purchase and Others 14,767 7,232 1,404
Outstanding balances for related party transactions [Abstract]      
Trade receivables 60,767 53,615 728
Trade payables 90,509 53,759 68,007
Non-trade receivables and others 44,237 34,180 10,589
Non-trade payables and others 151,544 158,438 18,487
Accrued interest income 0 0 0
Derivative assets 0 0 0
Derivative liabilities 0 0 0
Naepo Green Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 217 154 160
Outstanding balances for related party transactions [Abstract]      
Trade receivables 56 18  
Cheongna Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 13,791 9,922 11,688
Electricity purchase 66 58,747 58
Outstanding balances for related party transactions [Abstract]      
Trade receivables 1,592 1,074  
Non-trade receivables and others 1,186 0  
DAYONE Energy Co., Ltd. (formerly, Hyundai Energy Co., Ltd.)      
Disclosure of transactions between related parties [Line Items]      
Service sales 4,816 3,437 1,718
Electricity purchase 1,120 2,847 3,445
Outstanding balances for related party transactions [Abstract]      
Trade receivables 57 128  
Trade payables 10 175  
Non-trade receivables and others 11,749 12,532  
Non-trade payables and others 9,119 9,178  
Daegu Green Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,285 1,151 1,022
Electricity purchase 215,224 296,464 287,008
Outstanding balances for related party transactions [Abstract]      
Trade receivables 44 113  
Trade payables 26,213 28,980  
Non-trade receivables and others 55 1  
KAPES, Inc.      
Disclosure of transactions between related parties [Line Items]      
Commission 476 504 648
Service purchase 219,673 142,511 77,758
Outstanding balances for related party transactions [Abstract]      
Trade receivables 2 1  
Non-trade receivables and others 5,172 0  
Non-trade payables and others 20,577 50,738  
Honam Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 502 657 415
Electricity purchase 4,382 5,306 7,700
Outstanding balances for related party transactions [Abstract]      
Trade payables 216 347  
Non-trade payables and others 345 1,671  
Jeongam Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,213 1,198 724
Electricity purchase 5,982 0 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 0 165  
Non-trade receivables and others 162    
Non-trade payables and others 692 6  
Korea Power Engineering Service Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 203 348 840
Service purchase 1,594 1,774 1,765
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 43 74  
Seokmun Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 1,932 1,495 1,897
Electricity purchase 33,164 26,370 31,759
Outstanding balances for related party transactions [Abstract]      
Trade receivables 62 51  
Trade payables 4,898    
Non-trade receivables and others 9,460 136  
Non-trade payables and others 9,559 4,750  
Incheon New Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Construction revenue 14 354 568
Chun-cheon Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 2,657 2,397 2,471
Electricity purchase 222,069 313,471 320,954
Outstanding balances for related party transactions [Abstract]      
Trade receivables 98 260  
Trade payables 27,428 23,438  
Non-trade receivables and others 165 5,362  
Yeonggwangbaeksu Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 1,788 1,744 1,540
Electricity purchase 11,232 11,739 11,366
Outstanding balances for related party transactions [Abstract]      
Trade receivables 8 6  
Trade payables 405 671  
Non-trade receivables and others 159 157  
Non-trade payables and others 1,747 1,526  
Yeonggwang Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 793 705 46
Electricity purchase 24,103 11,940 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 12 10  
Trade payables 886    
Non-trade receivables and others 54 54  
Non-trade payables and others 3,038 2,432  
Sam-Yang Photovoltaic Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 33    
Electricity purchase 3,848    
Outstanding balances for related party transactions [Abstract]      
Trade receivables 5    
Non-trade payables and others 625    
NH-Amundi Global Infrastructure Investment Private Investment Trust 21      
Disclosure of transactions between related parties [Line Items]      
Service sales 1,388    
KW Nuclear Components Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 1,639 721 839
Outstanding balances for related party transactions [Abstract]      
Trade receivables 4 4  
Non-trade receivables and others 0 15  
KEPCO-Uhde Inc.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 8 15 17
Outstanding balances for related party transactions [Abstract]      
Non-trade payables and others 0 9  
Busan Shinho Solar Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 353 452 362
REC purchase 7,296 7,843 7,901
Outstanding balances for related party transactions [Abstract]      
Trade receivables 2 2  
Trade payables 135 148  
Non-trade payables and others 780 733  
Global Trade Of Power System Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service purchase 337 502 565
Expressway Solar-light Power Generation Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
REC purchase 2,472 3,067 3,513
Daesan Green Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 703 39 0
Electricity purchase 104,854 0 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 11 6  
Trade payables 7,694 0  
Non-trade receivables and others 216 0  
Taebaek Gadeoksan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 3    
Outstanding balances for related party transactions [Abstract]      
Trade payables 2,473    
Non-trade receivables and others 5    
Non-trade payables and others 5    
Cheong-Song Noraesan Wind Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 29 6 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 2 1  
Saemangeum Solar Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 2,846 2,230 0
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 3,141 2,197  
Jaeun Resident Wind Power Plant Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 0 105 0
Dangjin Eco Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 33 4 3,424
Electricity purchase 3,953 0 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 3 2  
Trade payables 326 0  
Bitsolar Energy Co., Ltd.,      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 42    
Busan Industrial Solar Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity purchase 19    
Outstanding balances for related party transactions [Abstract]      
Trade payables 1    
Haemodum Solar Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 4    
Electricity purchase 967    
Yeongam Solar Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 165    
Electricity purchase 32,208    
Outstanding balances for related party transactions [Abstract]      
Trade receivables 26    
Trade payables 14,652    
Solaseado Solar Power Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 66    
Electricity purchase 28,516    
29 Joint ventures (Overseas)      
Disclosure of transactions between related parties [Line Items]      
Electricity sales and others 831,596 1,275,279 206,054
Electricity purchase and Others 14,767 7,232 1,404
15 Joint ventures (Overseas)      
Outstanding balances for related party transactions [Abstract]      
Trade receivables 58,839 51,700  
Non-trade receivables and others 17,217 13,652  
Non-trade payables and others 105,682 87,395  
Other related parties      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 4,248 3,948 3,524
Service sales 5,819 0 1,230
Design service 0 0 0
Dividend paid 17 20 166,876
Commission 0 0 0
Technical fee 0 0 0
Construction revenue 0 0 0
Interest income 3,461 2,091 4,438
Interest expense 3,872 4,063 5,043
Electricity purchase 0 0 0
Purchase of power generation fuel 0 0 0
REC purchase 0 0 4,019
Service purchase 0 0 63
Rental fee and others 0 0 0
Electricity metering service fee 0 0 0
Trading fees 0 0 0
Woodchip purchase 0 0 0
Electricity sales and others 0 0 0
Electricity purchase and Others 0 0 0
Outstanding balances for related party transactions [Abstract]      
Trade receivables 0 0 0
Trade payables 0 0 0
Non-trade receivables and others 206,916 146,416 12,125
Non-trade payables and others 123 152 218
Accrued interest income 51 1,630 1,147
Derivative assets 20,167 41,368 27,306
Derivative liabilities 20,001 6,531 18,095
Yeongwol Energy Station Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 0 0 373
REC purchase 0 0 4,019
DS POWER Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 0 0 565
Ulleungdo Natural Energy Co., Ltd.      
Disclosure of transactions between related parties [Line Items]      
Service sales 0 0 292
Service purchase 0 0 63
Korea Development Bank      
Disclosure of transactions between related parties [Line Items]      
Electricity sales 4,248 3,948 3,524
Dividend paid 17 20 166,876
Interest income 3,461 2,091 4,438
Interest expense 3,872 4,063 ₩ 5,043
Outstanding balances for related party transactions [Abstract]      
Non-trade receivables and others 206,916 146,416  
Non-trade payables and others 123 152  
Accrued interest income 51 1,630  
Derivative assets 20,167 41,368  
Derivative liabilities ₩ 20,001 ₩ 6,531