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Key management personnel compensation (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Key management personnel compensation [Abstract]      
Salaries ₩ 1,106 ₩ 1,315 ₩ 1,295
Retirement benefits 24 31 58
Total ₩ 1,130 ₩ 1,346 ₩ 1,353