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Commitments - Summary of Commitments (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Commitments [Line Items]    
Commitments ¥ 11,091 ¥ 26,053
Smart musical instruments [Member]    
Commitments [Line Items]    
Commitments 6,091 1,028
Intangible Assets    
Commitments [Line Items]    
Commitments ¥ 5,000 ¥ 25,025