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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