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Accounts and Other Receivables - Summary of Changes in Loss Allowance of Accounts and Other Receivables (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade And Other Receivables [Line Items]      
Bad debt expenses ₩ 713 ₩ 281 ₩ 151
Reversal of allowance for doubtful accounts (50) (34)  
Accounts Receivables      
Trade And Other Receivables [Line Items]      
Beginning balance 165 22 123
Bad debt expenses 712 281 55
Reversal of allowance for doubtful accounts (50)    
Write-off (248) (138) (156)
Ending balance 579 165 22
Other Receivables      
Trade And Other Receivables [Line Items]      
Beginning balance 4 84 46
Bad debt expenses 1   40
Reversal of allowance for doubtful accounts   (34)  
Write-off   (46) (2)
Ending balance ₩ 5 ₩ 4 ₩ 84