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Property and equipment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property and equipment      
Beginning of the year ¥ 85,076 ¥ 151,401  
Additions 64,351 27,593  
Disposals, net (45,317) (19,291)  
Depreciation charge (51,889) (68,729) ¥ (106,118)
Disposal of subsidiaries (Note 12) (7,400)    
Exchange difference 86 281  
End of the year 43,895 85,076 151,401
Continuing and Discontinued operations      
Property and equipment      
Depreciation charge (52,901) (74,908) (119,309)
Gross carrying amount      
Property and equipment      
Beginning of the year 532,946    
End of the year 470,037 532,946  
Accumulated depreciation      
Property and equipment      
Beginning of the year (445,930)    
End of the year (424,288) (445,930)  
Exchange difference      
Property and equipment      
Beginning of the year 1,940    
End of the year 1,854 1,940  
Office and telecommunication equipment      
Property and equipment      
Beginning of the year 25,246 41,855  
Additions 2,146 2,987  
Disposals, net (1,438) (877)  
Disposal of subsidiaries (Note 12) (1,623)    
Exchange difference 9 42  
End of the year 14,798 25,246 41,855
Office and telecommunication equipment | Continuing and Discontinued operations      
Property and equipment      
Depreciation charge (9,542) (18,761)  
Office and telecommunication equipment | Gross carrying amount      
Property and equipment      
Beginning of the year 111,470    
End of the year 90,947 111,470  
Office and telecommunication equipment | Accumulated depreciation      
Property and equipment      
Beginning of the year (83,610)    
End of the year (73,544) (83,610)  
Office and telecommunication equipment | Exchange difference      
Property and equipment      
Beginning of the year 2,614    
End of the year 2,605 2,614  
Right-of-use properties      
Property and equipment      
Beginning of the year 48,572 89,574  
Additions 58,238 21,612  
Disposals, net (43,879) (17,718)  
Disposal of subsidiaries (Note 12) (5,777)    
Exchange difference 35 186  
End of the year 23,706 48,572 89,574
Right-of-use properties | Continuing and Discontinued operations      
Property and equipment      
Depreciation charge (33,483) (45,082)  
Right-of-use properties | Gross carrying amount      
Property and equipment      
Beginning of the year 303,092    
End of the year 256,740 303,092  
Right-of-use properties | Accumulated depreciation      
Property and equipment      
Beginning of the year (255,879)    
End of the year (234,428) (255,879)  
Right-of-use properties | Exchange difference      
Property and equipment      
Beginning of the year (1,359)    
End of the year (1,394) (1,359)  
Leasehold improvements      
Property and equipment      
Beginning of the year 11,258 19,972  
Additions 3,967 2,994  
Disposals, net   (696)  
Exchange difference 42 53  
End of the year 5,391 11,258 ¥ 19,972
Leasehold improvements | Continuing and Discontinued operations      
Property and equipment      
Depreciation charge (9,876) (11,065)  
Leasehold improvements | Gross carrying amount      
Property and equipment      
Beginning of the year 118,384    
End of the year 122,350 118,384  
Leasehold improvements | Accumulated depreciation      
Property and equipment      
Beginning of the year (106,441)    
End of the year (116,316) (106,441)  
Leasehold improvements | Exchange difference      
Property and equipment      
Beginning of the year 685    
End of the year ¥ 643 ¥ 685