Intangible Assets - Schedule of Intangible Assets (Details) - KRW (₩) ₩ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Gross Carrying Amount	₩ 590,762	₩ 590,762
Accumulated Amortization	288,607	(187,709)
Net Carrying Amount	302,155	403,053
Industrial Property Rights [Member]
Gross Carrying Amount	5,960	5,960
Accumulated Amortization	5,260	(4,841)
Net Carrying Amount	700	1,119
Software [Member]
Gross Carrying Amount	62,782	62,782
Accumulated Amortization	62,782	(62,782)
Net Carrying Amount	0
Customers Relationship [Member]
Gross Carrying Amount	500,000	500,000
Accumulated Amortization	200,000	(100,000)
Net Carrying Amount	300,000	400,000
Other [Member]
Gross Carrying Amount	22,020	22,020
Accumulated Amortization	20,565	(20,086)
Net Carrying Amount	₩ 1,455	₩ 1,934