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Intangible asset (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cost    
Begining Balance ¥ 9 ¥ 0
Additions   9
Ending Balance 9 9
Accumulated amortization    
Begining Balance 2 0
Amortization 1 2
Ending Balance 3 2
Intangible asset, net ¥ 6 ¥ 7