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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, 2020 | Dec. 31, 2019
Property and Equipment |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | ₩ 7 | ₩ 25
Increase (decrease) | 5 | (18)
Ending balance | 12 | 7
Intangible Assets |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 221 | 238
Increase (decrease) | 181 | (17)
Ending balance | 402 | 221
Other Non-current Assets |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 104 | 8
Increase (decrease) | 401 | 96
Ending balance | 505 | 104
Accounts Payables |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 1,527 | 531
Increase (decrease) | (58) | 996
Ending balance | 1,469 | 1,527
Accrued Expenses |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 39 |
Increase (decrease) | 138 | 39
Ending balance | 177 | 39
Deferred Revenue |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 674 | 60
Increase (decrease) | (177) | 614
Ending balance | 497 | 674
Allowance for doubtful account |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 275 | 264
Increase (decrease) | 10 | 11
Ending balance | 285 | 275
Other Non-current Liabilities |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 46 | 46
Ending balance | 46 | 46
Investments in Subsidiaries |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 389 |
Increase (decrease) | (389) | 389
Ending balance |  | 389
Lease |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 1 |
Increase (decrease) | 7 | 1
Ending balance | 8 | 1
Foreign Taxes Paid |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance |  | (4)
Increase (decrease) | 1 | 4
Ending balance | 1 |
Investments in Subsidiaries(*) |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Increase (decrease) | (2,577) |
Ending balance | (2,577) |
Others |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | (25) | (21)
Increase (decrease) | 67 | (4)
Ending balance | 42 | (25)
Deferred Income Tax on Temporary Differences |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 3,258 | 1,147
Increase (decrease) | (2,391) | 2,111
Ending balance | 867 | 3,258
Deferred Tax Due to Carry-forward Deficits |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 33 | 1,951
Increase (decrease) | (33) | (1,918)
Ending balance |  | 33
Deferred Tax Due to Tax Credit Carry-forward |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 4,371 | 4,315
Increase (decrease) | (1,648) | 56
Ending balance | 2,723 | 4,371
Deferred Tax Assets |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |
Beginning balance | 7,662 | 7,413
Increase (decrease) | (4,072) | 249
Ending balance | ₩ 3,590 | ₩ 7,662

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