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Segment Information - Summary of Non-Current Assets by Geographical Regions (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Geographical Areas [Line Items]      
Non-current assets ₩ 13,093 ₩ 9,902 ₩ 4,099
Domestic      
Disclosure Of Geographical Areas [Line Items]      
Non-current assets 7,612 5,732 3,054
Overseas      
Disclosure Of Geographical Areas [Line Items]      
Non-current assets ₩ 5,481 ₩ 4,170 ₩ 1,045