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SHORT TERM INVESTMENT (Tables)
12 Months Ended
Dec. 31, 2021
Short-term Investments [Abstract]  
Schedule of short term investments
    
As of December 31,
 
    
2020
    
2021
 
    
RMB
    
RMB
 
Time deposits
     134,146        167,781  
Wealth management products
     —          212,271  
    
 
 
    
 
 
 
Total short-term investment
     134,146        380,052