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REVENUE AND OTHER INCOME - Operations by business segment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Operating Segments (Line Items)      
Revenue ¥ 216,270 ¥ 182,989 ¥ 327,581
Total cost of revenues 148,929 208,991 246,255
Bad debt expense (125,554) (150,268) (68,660)
Other expenses 124 0 0
Total Other Income 9,420 21,931 14,636
Loss from operations (89,841) (193,062) (9,445)
Operating segments | Revenues      
Disclosure Of Operating Segments (Line Items)      
Revenue 216,270 182,989 327,581
Operating segments | Revenues | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Revenue 144,743 182,989 327,581
Operating segments | Revenues | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Revenue 71,527    
Operating segments | Cost of revenues      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 148,929 208,991 246,255
Operating segments | Cost of revenues | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 83,436 208,991 246,255
Operating segments | Cost of revenues | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Total cost of revenues 65,493    
Operating segments | Operating costs and expenses      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 40,924 38,723 36,747
Operating segments | Operating costs and expenses | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 20,292 38,723 36,747
Operating segments | Operating costs and expenses | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 9,955    
Operating segments | Operating costs and expenses | Others      
Disclosure Of Operating Segments (Line Items)      
Total operating costs and expenses 10,677    
Operating segments | Bad debt expense      
Disclosure Of Operating Segments (Line Items)      
Bad debt expense 125,554 150,268 68,660
Operating segments | Bad debt expense | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Bad debt expense 115,407 150,268 68,660
Operating segments | Bad debt expense | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Bad debt expense 10,147    
Operating segments | Other expenses      
Disclosure Of Operating Segments (Line Items)      
Other expenses 124    
Operating segments | Other expenses | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Other expenses 90    
Operating segments | Other expenses | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Other expenses 34    
Operating segments | Other income      
Disclosure Of Operating Segments (Line Items)      
Total Other Income 9,420 21,931 14,636
Operating segments | Other income | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total Other Income 9,389 14,682 7,436
Operating segments | Other income | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Total Other Income 29 7,249 7,200
Operating segments | Other income | Others      
Disclosure Of Operating Segments (Line Items)      
Total Other Income 2    
Operating segments | Loss (income) from operations      
Disclosure Of Operating Segments (Line Items)      
Loss from operations (89,841) (193,062) (9,445)
Operating segments | Loss (income) from operations | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Loss from operations (65,093) (193,062) ¥ (9,445)
Operating segments | Loss (income) from operations | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Loss from operations (14,073)    
Operating segments | Loss (income) from operations | Others      
Disclosure Of Operating Segments (Line Items)      
Loss from operations (10,675)    
Operating segments | Segment assets      
Disclosure Of Operating Segments (Line Items)      
Total assets 177,867 225,386  
Operating segments | Segment assets | Sale of tile products      
Disclosure Of Operating Segments (Line Items)      
Total assets 147,890 ¥ 225,386  
Operating segments | Segment assets | Business management and consulting      
Disclosure Of Operating Segments (Line Items)      
Total assets 27,222    
Operating segments | Segment assets | Others      
Disclosure Of Operating Segments (Line Items)      
Total assets ¥ 2,755