Financial Instruments - Fair values and risk management (Details 3) - KRW (₩) ₩ in Thousands |
Dec. 31, 2025 |
Jan. 02, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|---|---|
| Notes and other explanatory information [abstract] | |||||
| Cash and cash equivalents | ₩ 8,364,432 | ₩ 3,508,608 | ₩ 4,150,572 | ₩ 8,585,634 | ₩ 30,581,556 |
| Short-term financial instruments | 21,560 | 410,000 | |||
| Accounts receivable, net | 4,917,020 | 9,340,923 | |||
| Short-term loans, net | 3,427,400 | 787,400 | |||
| Other current financial assets | 735,110 | 40,000 | |||
| Long-term financial instruments | 310,908 | ||||
| Long-term investment securities | 3,983,858 | ||||
| Long-term loans, net | 191,023 | ||||
| Other non-current financial assets | 2,180,055 | 1,803,220 | |||
| Total | ₩ 24,131,366 | ₩ 16,532,115 |