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Key management personnel compensation (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Key management personnel compensation [Abstract]      
Salaries ₩ 1,271 ₩ 1,463 ₩ 1,271
Employee benefits 54 33 59
Total ₩ 1,325 ₩ 1,496 ₩ 1,330