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Capital - Summary of Common Shares (Details) - KRW (₩)
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Classes Of Share Capital [Line Items]    
Number of shares issued 6,948,900  
Common shares ₩ 3,474,000,000 ₩ 3,474,000,000
Common Shares    
Disclosure Of Classes Of Share Capital [Line Items]    
Number of authorized shares 40,000,000 40,000,000
Value per share ₩ 500 ₩ 500
Number of shares issued 6,948,900 6,948,900
Common shares ₩ 3,474,450,000 ₩ 3,474,450,000