| Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Operating revenue | 2,431 | 2,906 | 3,268 | 3,547 | 8,161 |
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| Operating expenses | 2,247 | 2,698 | 3,070 | 3,392 | 8,018 |
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| Operating profit (loss) | 185 | 208 | 197 | 155 | 143 |
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| Interest income | 0 | 0 | 0 | 0 | 0 |
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| Dividend income | 1 | 0 | 1 | 0 | 1 |
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| Insurance claim income | 0 | 2 | 1 | - | 0 |
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| Subsidy income | - | - | - | 1 | - |
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| Other | 0 | 0 | 0 | 0 | 1 |
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| Compensation income | - | - | - | - | 3 |
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| Non-operating income | 2 | 13 | 4 | 3 | 5 |
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| Settlement income | - | - | - | 2 | - |
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| Other | 0 | 0 | 0 | 0 | 1 |
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| Non-operating income | 2 | 13 | 4 | 3 | 5 |
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| Interest expenses | 2 | 2 | 1 | 2 | 13 |
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| Commission expenses | - | - | - | - | 2 |
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| Loss on valuation of investment securities | - | - | - | 2 | - |
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| Other | 0 | 0 | 0 | 0 | 0 |
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| Non-operating expenses | 3 | 2 | 13 | 4 | 15 |
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| Ordinary profit (loss) | 183 | 219 | 188 | 154 | 134 |
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| Gain on sale of non-current assets | 1 | - | 1 | 2 | - |
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| Extraordinary income | 1 | - | 1 | 2 | - |
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| Provision for loss on relocation | - | - | - | - | 2 |
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| Impairment losses | 2 | - | - | - | 6 |
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| Impairment losses | 2 | - | - | - | 6 |
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| Loss on cancellation of leases | - | - | 2 | 0 | - |
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| Loss on retirement of non-current assets | 3 | - | 11 | 0 | - |
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| Other | - | - | - | - | 1 |
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| Loss on cancellation of leases | - | - | 2 | 0 | - |
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| Extraordinary losses | 7 | 0 | 13 | 0 | 8 |
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| Other | - | - | - | - | 1 |
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| Extraordinary losses | 7 | 0 | 13 | 0 | 8 |
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| Profit (loss) before income taxes | 177 | 219 | 175 | 156 | 125 |
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| Income taxes - current | 63 | 66 | 67 | 55 | 121 |
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| Income taxes - deferred | -10 | -2 | -4 | -1 | -49 |
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| Income taxes | 53 | 64 | 63 | 54 | 72 |
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| Profit (loss) | 123 | 155 | 112 | 102 | 53 |
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| Profit (loss) attributable to owners of parent | 123 | 155 | 112 | 102 | 53 |
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