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DEFERRED REVENUE
 12 Months Ended
Dec. 31, 2021
Revenue Recognition and Deferred Revenue [Abstract]  
DEFERRED REVENUE
12. DEFERRED REVENUE
 
    
As of December 31,
  
    
2020
     
2021
  
    
RMB
     
RMB
  
Deferred merchandise revenue
      40,645        99,213  
Deferred membership program revenue
      —          1,025  
Deferred marketplace revenue
      9,113        4,402  
Deferred other revenue
      1,193        1,112  
    
 
 
     
 
 
  
Total deferred revenue
      50,951        105,752  
    
 
 
     
 
 
  
The revenue recognized in the years ended December 31, 2019, 2020 and 2021 that was included in deferred revenue as of the beginning of each respective period were RMB 181,828 , RMB 50,951 and RMB 105,752 , respectively.