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Intangible assets, net - Amortization expenses recognized (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Intangible assets, net    
2024 ¥ 6,712  
2025 6,329  
2026 3,313  
2027 1,610  
2028 and thereafter 2,132  
Net carrying amount ¥ 20,096 ¥ 24,051