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Income tax - Composition of income tax expenses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax      
Current income tax expense ¥ 195 ¥ (471) ¥ 200
Total income tax expense/ (benefits) ¥ 195 ¥ (471) ¥ 200