Loss per share (Details) - KRW (₩) ₩ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Notes and other explanatory information [abstract]
Loss for the period, attributable to the owners of Parent Company	₩ (205,742,925)	₩ (2,541,375)	₩ 3,137,186
Dividends on non-redeemable preference shares
Loss attributable to ordinary shareholders	₩ (205,742,925)	₩ (2,541,375)	₩ 3,137,186

The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 81B
-Subparagraph a
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81B_a_ii&doctype=Standard
-URIDate 2024-03-27

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration