Intangible Assets - Schedule of Intangible Assets (Details) - KRW (₩) ₩ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Gross Carrying Amount	₩ 590,763	₩ 590,762
Accumulated Amortization	(263,384)	(187,709)
Net Carrying Amount	327,379	403,053
Industrial Property Rights [Member]
Gross Carrying Amount	5,960	5,960
Accumulated Amortization	(5,156)	(4,841)
Net Carrying Amount	804	1,119
Software [Member]
Gross Carrying Amount	62,782	62,782
Accumulated Amortization	(62,782)	(62,782)
Net Carrying Amount
Customers Relationship [Member]
Gross Carrying Amount	500,000	500,000
Accumulated Amortization	(175,000)	(100,000)
Net Carrying Amount	325,000	400,000
Other [Member]
Gross Carrying Amount	22,021	22,020
Accumulated Amortization	(20,446)	(20,086)
Net Carrying Amount	₩ 1,575	₩ 1,934