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Income Tax Expense - Schedule of Changes in Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Property and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | ₩ 12 | ₩ 7
Increase (decrease) | 22 | 5
Ending balance | 34 | 12
Intangible assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 402 | 221
Increase (decrease) | (5) | 181
Ending balance | 398 | 402
Other non-current assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 505 | 104
Increase (decrease) | 25 | 401
Ending balance | 530 | 505
Accounts payables |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 1,469 | 1,527
Increase (decrease) | (65) | (58)
Ending balance | 1,404 | 1,469
Accrued expenses |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 177 | 39
Increase (decrease) | 15 | 138
Ending balance | 192 | 177
Deferred revenue |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 497 | 674
Increase (decrease) | (186) | (177)
Ending balance | 311 | 497
Allowance for doubtful account |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 285 | 275
Increase (decrease) | 82 | 10
Ending balance | 367 | 285
Other non-current liabilities |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 46 | 46
Increase (decrease) | 29 | 0
Ending balance | 75 | 46
Investments in subsidiaries |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 0 | 389
Increase (decrease) |  | (389)
Ending balance |  | 0
Lease |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 8 | 1
Increase (decrease) | (51) | 7
Ending balance | (43) | 8
Foreign taxes paid |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 1 | 0
Increase (decrease) | 0 | 1
Ending balance | 1 | 1
Investments in subsidiaries |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | (2,577) | 0
Increase (decrease) | (1,182) | (2,577)
Ending balance | (3,759) | (2,577)
Others |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 42 | (25)
Increase (decrease) | (45) | 67
Ending balance | (3) | 42
Sub Total |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 867 | 3,258
Increase (decrease) | (1,361) | (2,391)
Ending balance | (494) | 867
Deferred tax due to carry-forward deficits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 0 | 33
Increase (decrease) | 135 | (33)
Ending balance | 135 | 0
Deferred tax due to tax credit carry-forward |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 2,723 | 4,371
Increase (decrease) | (645) | (1,648)
Ending balance | 2,078 | 2,723
Deferred tax assets |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Beginning balance | 3,590 | 7,662
Increase (decrease) | (1,871) | (4,072)
Ending balance | ₩ 1,719 | ₩ 3,590

X
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