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Income Tax Expense - Schedule of Income Tax Expense (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major Components Of Tax Expense Income [Abstract]      
Current tax on profit for the year ₩ 21,383 ₩ 11,775 ₩ 7,430
Deferred tax expense (benefit) 4,072 (249) (4,377)
Income tax expense ₩ 25,455 ₩ 11,526 ₩ 3,053