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Leases - Summary of Carrying Amounts of Right-of-Use Assets Recognised and Movements During Years (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning Balance ¥ 14,918,000 ¥ 10,728,000  
Additions 2,734,000 5,682,000  
Acquisition from business combinations (Note 8)   2,988,000  
Depreciation charge (4,139,000) (4,480,000) ¥ (1,618,000)
Lease Termination (10,453,000)    
Ending Balance 3,060,000 14,918,000 10,728,000
Building      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning Balance 4,318,000 2,569,000  
Additions 2,259,000 1,286,000  
Acquisition from business combinations (Note 8)   2,988,000  
Depreciation charge (3,443,000) (2,525,000)  
Lease Termination (74,000)    
Ending Balance 3,060,000 4,318,000 2,569,000
Music Education Equipment      
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]      
Beginning Balance 10,600,000 8,159,000  
Additions 475,000 4,396,000  
Acquisition from business combinations (Note 8)   0  
Depreciation charge (696,000) (1,955,000)  
Lease Termination (10,379,000)    
Ending Balance ¥ 0 ¥ 10,600,000 ¥ 8,159,000