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Employee Benefits - Additional Information (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Defined Benefit Plans [Abstract]      
Defined contribution plan expenses ₩ 1,968 ₩ 1,812 ₩ 1,546