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Transactions with Related Parties - Summary of Key Management Personnel Compensation (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions [Abstract]      
Salary ₩ 1,177 ₩ 866 ₩ 690