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Loans payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]    
Loans Payable ¥ 161,569 ¥ 171,569
Third parties [Member]    
Statement [Line Items]    
Loans Payable 140,558 140,558
Shareholders [Member]    
Statement [Line Items]    
Loans Payable 20,000 20,000
Related parties [Member]    
Statement [Line Items]    
Loans Payable ¥ 1,011 ¥ 11,011