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ACCOUNTS RECEIVABLE, NET - Movement of the allowance for doubtful accounts (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary of movement of the allowance for doubtful accounts      
Balance at the beginning of the year ¥ 29,593,693 ¥ 4,549,366 ¥ 3,307,381
Additions 139,445,017 25,044,327 1,272,454
Write-off     (30,469)
Balance at the end of the year ¥ 169,038,710 ¥ 29,593,693 ¥ 4,549,366