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Segment Information - Summary Revenue from External Customers by Country (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Geographical Areas [Line Items]      
Revenue ₩ 405,953 ₩ 360,967 ₩ 286,770
Korea      
Disclosure Of Geographical Areas [Line Items]      
Revenue 109,895 45,273 80,814
Taiwan      
Disclosure Of Geographical Areas [Line Items]      
Revenue 100,049 52,118 98,210
Japan      
Disclosure Of Geographical Areas [Line Items]      
Revenue 22,500 28,469 9,767
The United States of America      
Disclosure Of Geographical Areas [Line Items]      
Revenue 20,659 55,062 10,572
Thailand      
Disclosure Of Geographical Areas [Line Items]      
Revenue 59,086 62,043 43,846
The Philippines      
Disclosure Of Geographical Areas [Line Items]      
Revenue 23,690 30,951 15,539
Others      
Disclosure Of Geographical Areas [Line Items]      
Revenue 57,345 64,696 18,663
IDAHO      
Disclosure Of Geographical Areas [Line Items]      
Revenue ₩ 12,729 ₩ 22,355 ₩ 9,359