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Income tax expense (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Expense Details Abstract      
Current tax on profit for the year ¥ 18,033 ¥ 15,550 ¥ 15,221
Deferred income tax expenses
Income tax expense ¥ 18,033 ¥ 15,550 ¥ 15,221