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Intangible Assets - Schedule of Estimated Future Amortization Expense Related to Intangible Assets (Details) - KRW (₩)
₩ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 ₩ 75,674  
2020 100,794  
2021 100,479  
2022 58  
Total ₩ 277,005 ₩ 302,155