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FAIR VALUE MEASUREMENTS - Summary of assets measured at fair value on recurring basis (Details) - Fair value measurements - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
FAIR VALUE MEASUREMENTS    
Short-term investments ¥ 72,500 ¥ 18,505
Level 1    
FAIR VALUE MEASUREMENTS    
Short-term investments 48,187  
Level 2    
FAIR VALUE MEASUREMENTS    
Short-term investments ¥ 24,313 ¥ 18,505