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Loans receivables (Details ) - CubeBio Co., Ltd. [Member] - KRW (₩)
₩ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]        
Face value ₩ 2,811,949 ₩ 2,703,047 ₩ 2,703,047 ₩ 4,337,850
Accrued interest income     39,847 30,145
Carrying amount ₩ 2,520,824 2,114,674 ₩ 2,114,674 ₩ 2,132,205
Eun Jong Choi [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate 4.60% [1]   4.60% [2],[3] 4.60% [4]
Maturity Dec. 31, 2026   Jun. 30, 2026 [2],[3] Jun. 30, 2025 [4]
Face value ₩ 100,000 [1] 100,000 [1] ₩ 100,000 [2],[3] ₩ 100,000 [4]
Accrued interest income     25,739 [2],[3] 21,139 [4]
Carrying amount ₩ 128,021 [1] 125,739 [1] ₩ 125,739 [2],[3] ₩ 121,139 [4]
Eun Jong Choi 1 [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate 4.60% [1]   4.60% [2],[3] 4.60% [4]
Maturity Dec. 31, 2026   Jun. 30, 2026 [2],[3] Jun. 30, 2025 [4]
Face value ₩ 40,000 [1] 40,000 [1] ₩ 40,000 [2],[3] ₩ 40,000 [4]
Accrued interest income     10,296 [2],[3] 8,456 [4]
Carrying amount ₩ 51,208 [1] 50,296 [1] ₩ 50,296 [2],[3] ₩ 48,456 [4]
CubeBio Holdings., Ltd. [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate 4.60% [5]   4.60% [6],[7] 4.60% [8]
Maturity Sep. 24, 2026   Sep. 24, 2026 [6],[7] Sep. 24, 2025 [8]
Face value ₩ 46,245 [5] 43,047 [5] ₩ 43,047 [6],[7] ₩ 44,100 [8]
Accrued interest income     2,517 [6],[7] 550 [8]
Carrying amount ₩ 50,048 [5] 45,564 [5] ₩ 45,564 [6],[7] 44,650 [8]
Dongsung D&C [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate 4.60% [9]   4.60%  
Maturity Nov. 04, 2026   Nov. 04, 2026  
Face value ₩ 220,000 [9] 220,000 [9] ₩ 220,000  
Accrued interest income     1,295  
Carrying amount 226,314 [9] 221,295 [9] 221,295  
Subtotal [Member]        
IfrsStatementLineItems [Line Items]        
Face value 511,949 403,047 403,047 2,037,850
Accrued interest income     39,847 30,145
Carrying amount ₩ 561,944 442,894 ₩ 442,894 ₩ 214,245
Magium Corp. [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate 5.00% [10]   5.00% [4],[11] 5.00% [12]
Maturity Mar. 31, 2027   Mar. 31, 2027 [4],[11] Mar. 31, 2027 [12]
Face value ₩ 2,300,000 [10] 2,300,000 [10] ₩ 2,300,000 [4],[11] ₩ 2,300,000 [12]
Accrued interest income     [4],[11] [12]
Carrying amount ₩ 1,958,880 [10] ₩ 1,671,780 [10] ₩ 1,671,780 [4],[11] ₩ 1,917,960 [12]
MERITin Corp. [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate [2]       6.90%
Maturity [2]       Sep. 30, 2015
Face value [2]       ₩ 1,803,750
Accrued interest income [2]      
Carrying amount [2]      
POEX Holdings Corp. [Member]        
IfrsStatementLineItems [Line Items]        
Nominal interest rate [6]       4.60%
Maturity [6]       Feb. 24, 2020
Face value [6]       ₩ 50,000
Accrued interest income [6]      
Carrying amount [6]      
[1] The loan to Eun Jong Choi is a related party transaction.
[2] The Company recognized a full provision for the balance of loan as of December 31, 2015.
[3] The loan to Eun Jong Choi is a related party transaction.
[4] The loan to Eun Jong Choi is a related party transaction.
[5] The loan to CubeBio Holdings Ltd. is denominated in USD 33,700 and presented in Korean won for reporting purposes. It is a related party transaction.
[6] The Company recognized a full provision for the balance of loan as of December 31, 2020.
[7] The loan to CubeBio Holdings Ltd. (Affiliate) is denominated in USD 30,000 and presented in Korean won for reporting purposes. It is a related party transaction.
[8] The loan to CubeBio Holdings., Ltd. (Affiliate) is denominated in USD 30,000 and presented in Korean won for reporting purposes. It is a related party transaction.
[9] The loan to Dongsung D&C is denominated in KRW 320,000,000 and presented in Korean won for reporting purposes. The loan to Dongsung D&C is a related party transaction.
[10] The loan was classified as long-term as it is not expected to be recovered within 12 months after the June 30, 2026 reporting period. In March 2026, the maturity date of the loan was extended to March 31, 2027, and the Company intends to further extend the maturity by one year in March 2027.
[11] The loan was classified as long-term as it is expected not to be recovered within 12 months after the December 31, 2025 reporting period. In March 2026, the maturity date of the loan was extended to March 31, 2027.
[12] The loan was classified as long-term as it is expected not to be recovered within 12 months after the December 31, 2024 reporting period. In February 2025, the maturity date of the loan was extended to March 31, 2026.