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Salary and benefit payable (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Salary and benefit payable    
Salary and benefit payable to employees ¥ 3,764 ¥ 11,433
Consulting expenses payable to a shareholder's representatives 0 2,580
Total ¥ 3,764 ¥ 14,013