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INCOME TAX - Additional information (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
INCOME TAX    
Income tax ¥ (141) ¥ 1,877
Deferred income tax benefits 500  
Current benefit (expense) ¥ 400  
CHINA    
INCOME TAX    
Tax on Interest Income Earned 10.00%  
UNITED STATES    
INCOME TAX    
Tax on Interest Income Earned 30.00%