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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period ¥ 18,135    
Depreciation charge for the year (10,709) ¥ (2,257) ¥ (1,251)
Property, plant and equipment at end of period 60,443 18,135  
Cost      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 23,576 7,348  
Acquisition from business combinations (Note 8)   769  
Additions 54,427 15,508  
Disposals (1,874) (49)  
Property, plant and equipment at end of period 76,129 23,576 7,348
Accumulated Depreciation      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period (5,441) (3,229)  
Depreciation charge for the year (10,709) (2,257)  
Disposals 464 45  
Property, plant and equipment at end of period (15,686) (5,441) (3,229)
Leasehold Improvements      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 1,278    
Property, plant and equipment at end of period 899 1,278  
Leasehold Improvements | Cost      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 4,136 3,638  
Acquisition from business combinations (Note 8)   498  
Additions 425    
Property, plant and equipment at end of period 4,561 4,136 3,638
Leasehold Improvements | Accumulated Depreciation      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period (2,858) (2,227)  
Depreciation charge for the year (804) (631)  
Property, plant and equipment at end of period (3,662) (2,858) (2,227)
Music Education Equipment      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 16,474    
Property, plant and equipment at end of period 59,197 16,474  
Music Education Equipment | Cost      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 18,226 2,793  
Additions 53,830 15,440  
Disposals (1,859) (7)  
Property, plant and equipment at end of period 70,197 18,226 2,793
Music Education Equipment | Accumulated Depreciation      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period (1,752) (294)  
Depreciation charge for the year (9,710) (1,464)  
Disposals 462 6  
Property, plant and equipment at end of period (11,000) (1,752) (294)
Furniture and Fixtures      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 156    
Property, plant and equipment at end of period 90 156  
Furniture and Fixtures | Cost      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 335 232  
Acquisition from business combinations (Note 8)   103  
Additions 6    
Property, plant and equipment at end of period 341 335 232
Furniture and Fixtures | Accumulated Depreciation      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period (179) (114)  
Depreciation charge for the year (72) (65)  
Property, plant and equipment at end of period (251) (179) (114)
Office Equipment      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 227    
Property, plant and equipment at end of period 257 227  
Office Equipment | Cost      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period 879 685  
Acquisition from business combinations (Note 8)   168  
Additions 166 68  
Disposals (15) (42)  
Property, plant and equipment at end of period 1,030 879 685
Office Equipment | Accumulated Depreciation      
Disclosure Of Property Plant And Equipment [Line Items]      
Property, plant and equipment at beginning of period (652) (594)  
Depreciation charge for the year (123) (97)  
Disposals 2 39  
Property, plant and equipment at end of period ¥ (773) ¥ (652) ¥ (594)