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Interest payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]    
Interest Payable ¥ 54,685 ¥ 36,122
Third parties [Member]    
Statement [Line Items]    
Interest Payable 41,138 27,647
Shareholders [Member]    
Statement [Line Items]    
Interest Payable 11,846 7,466
Related parties [Member]    
Statement [Line Items]    
Interest Payable ¥ 1,701 ¥ 1,009