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Income Tax - Summary of Components of Income Tax Expense (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major components of tax expense (income) [abstract]      
Current income tax charge ¥ 1,783 ¥ 10,143 ¥ 9,174
Over provision in prior years (1,899) (1,912)  
Deferred tax 1,151 (4,609) (73)
Income tax expense reported in profit or loss ¥ 1,035 ¥ 3,622 ¥ 9,101