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Earnings per share (Details) - CNY (¥)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net profit attributable to the equity holders of the Company - numerator for basic and diluted earnings per share ¥ 15,883 ¥ 46,893 ¥ 6,524
Weighted average share outstanding - denominator for basic and diluted earnings per share 1,001,575 1,001,047 1,000,172
Basic and diluted earnings per share ¥ 0.02 ¥ 0.05 ¥ 0.01