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General Information - Summary of Consolidated Subsidiaries (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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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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