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FAIR VALUE MEASUREMENT - Fair value hierarchy for assets and liabilities (Details) - CNY (¥)
Dec. 31, 2023
Dec. 31, 2022
Fair value hierarchy for assets and liabilities measured at fair value on recurring basis    
Short-term investments (Note 3)   ¥ 160,406,301
Assets at fair value ¥ 0  
Liabilities at fair value ¥ 0  
Level 2    
Fair value hierarchy for assets and liabilities measured at fair value on recurring basis    
Short-term investments (Note 3)   ¥ 160,406,301