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Other Income and Expenses - Summary of Details of Other Expense (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income And Expense [Abstract]      
Loss on retirement and disposal of property and equipment     ₩ 5
Impairment loss on intangible assets ₩ 115 ₩ 52 623
Impairment loss on other non-current assets 1,456 434  
Donation 13    
Miscellaneous loss 180 7 14
Total ₩ 1,764 ₩ 493 ₩ 642