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General Information - Additional Information (Details)
₩ in Millions
Dec. 31, 2020
KRW (₩)
Market
shares
Dec. 31, 2019
KRW (₩)
Feb. 08, 2005
shares
General Information [Line Items]      
Number of international markets | Market 93    
Number of shares issued | shares 6,948,900    
Share capital | ₩ ₩ 3,474 ₩ 3,474  
American Depositary Shares      
General Information [Line Items]      
Number of shares issued | shares     1,400,000
Share capital | ₩ ₩ 3,474