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Interest payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Interest payable ¥ 36,122 ¥ 17,723
Third parties [Member]    
Statement [Line Items]    
Interest payable 27,647 14,510
Shareholders [Member]    
Statement [Line Items]    
Interest payable 7,466 3,086
Related parties [Member]    
Statement [Line Items]    
Interest payable ¥ 1,009 ¥ 127