Consolidated Statements of Cash Flows - KRW (₩) ₩ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	₩ (1,138,660)	₩ (2,650,990)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	116,482	123,184
Pension plan expenses	216,916	237,779
Bad debt		18,255
Deferred income taxes	16,850	(9,118)
Warrants issued for professional service		614,350
Payroll offset against loan to affiliate		10,140
Foreign currency loss	6,825	(5,506)
Changes in operating assets and liabilities:
Accounts receivable	(65,998)	(191,811)
Inventories	(1,017)	225,090
Other current assets	16,478	3,885
Deposits	17,300	(32,702)
Accounts payable	256,997	178,964
Nontrade payables	175,562	(35,830)
Other current liabilities	45,027	(94,567)
Pension benefits payments	(42,877)	(146,893)
NET CASH USED IN OPERATING ACTIVITIES	(380,115)	(1,755,770)
CASH FLOWS FROM INVESTING ACTIVITIES:
Increase in loans to related parties		(225,101)
Decrease in loans to related parties	164,000	213,297
Purchase of short-term financial instruments	(76,000)	(273,000)
Proceeds from disposals of short-term financial instruments	300,251
Purchase of property and equipment		(51,424)
Purchase of intangible assets		(2,395)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES	388,251	(338,623)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from private placement, net	559,931	2,086,936
Drawdown of short-term borrowings	42,281	1,459,992
Repayment of short-term borrowings	(480,873)	(1,302,830)
Repayment of current portion of long-term debt	(225,240)	(120,000)
Borrowings of long-term debt	100,000	200,000
Advances from a related party		3,470
Increase in loans from related parties	188,016
Repayment of loans from related parties	(210,655)	(206,080)
NET CASH PROVIDED BY FINANCING ACTIVITIES	(26,540)	2,121,488
Effect of exchange rate on cash and cash equivalents	35,494	(75,750)
NET INCREASE IN CASH AND CASH EQUIVALENTS	17,090	(48,655)
CASH AND CASH EQUIVALENTS- beginning of year	109,316	157,971
CASH AND CASH EQUIVALENTS- end of period	126,406	109,316
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	162,401	235,408
Income taxes
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Offsetting long-term debts and deposits	95,749
Conversion of redeemable convertible preferred stock to common stock		636,007
Exchange of debt for common stock		4,759,322
Refinancing of short-term borrowings		₩ 1,828,000