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Organization and principal activities (Details 2) - CNY (¥)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]      
Net loss ¥ (395,803,000) ¥ (30,344,000) ¥ (128,072,000)
VIEs [Member]      
Statement [Line Items]      
Interest Income On Loans 11,218,000 44,797 20,627,000
Net loss ¥ (385,041,000) ¥ (23,947,000) ¥ (125,370,000)