Condensed Consolidated Statements of Cash Flows (Unaudited) - KRW (₩) ₩ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	₩ 636,130	₩ (270,698)	₩ 123,731	₩ (728,437)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization			178,787	87,407
Pension plan expenses			171,021	162,687
Deferred income taxes			20,724	1,901
Warrants issued for professional service			378,826
Foreign currency loss				6,825
Changes in operating assets and liabilities:
Accounts receivable			(203,104)	(58,749)
Inventories			(441,850)	(10,673)
Other current assets			16,913	(28,256)
Deposits			(852)	20,300
Accounts payable			(276,501)	(65,663)
Nontrade payables			413,401	408,627
Other current liabilities			3,117	4,319
Payment of lease liabilities			(91,790)
Pension benefits payments			(56,838)	(35,048)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES			235,585	(234,760)
CASH FLOWS FROM INVESTING ACTIVITIES:
Decrease in loans to related parties				163,276
Purchase of short-term financial instruments			(9,000)
Proceeds from disposals of short-term financial instruments			18,000	269,000
Purchase of property and equipment			(2,091)
NET CASH PROVIDED BY INVESTING ACTIVITIES			6,909	432,276
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from private placement, net				557,336
Warrants exercised			20,945
Drawdown of short-term borrowings				168,738
Repayment of short-term borrowings			(180,545)	(471,075)
Repayment of current portion of long-term debt			(134,552)	(313,600)
Borrowings of long-term debt			224,000	100,000
Increase in loans from related parties			398,061	217,304
Repayment of loans from related parties			(475,634)	(180,223)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES			(147,725)	78,480
Effect of exchange rate on cash and cash equivalents			(8,166)	(10,632)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			86,603	265,364
CASH AND CASH EQUIVALENTS- beginning of year			126,406	109,316	₩ 109,316
CASH AND CASH EQUIVALENTS- end of year	₩ 213,009	₩ 374,680	213,009	374,680	₩ 126,406
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest			223,408	121,355
Income taxes
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Recognition of right-of-use assets and lease liabilities			318,835
Increase in loans from related parties due to payment of general expenses by related parties			₩ 55,593