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Leases (Details) - Schedule of Balance Sheet Information Related to Operating Lease
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2023
USD ($)
Schedule of Balance Sheet Information Related to Operating Lease [Abstract]          
Right-of-use assets ¥ 12,237,211   ¥ 31,403,688   $ 1,728,505
Less: impairment (3,244,676)     (458,857)
Right-of-use assets 8,992,535   31,403,688   1,269,648
Operating lease liabilities – current 8,806,671   18,079,265   1,243,406
Operating lease liabilities – non-current 5,216,622   13,276,535   736,530
Total operating lease liabilities 14,023,293   31,355,800   $ 1,979,936
Lease expense          
Operating lease expense - third party 10,148,284 $ 1,432,827 10,933,292    
Short-term lease expense 15,056,781 2,125,853    
Sublease income [1] (707,009) (99,822)    
Total lease expense 24,498,055 3,458,858 10,933,292 ¥ 3,498,048  
Other information          
Cash paid for operating leases 8,543,549 1,206,256      
Right-of-use assets obtained in exchange for operating new lease liabilities ¥ 15,838,886 $ 2,236,278 ¥ 35,873,660    
[1] For the year ended December 31, 2023, the Group incurred sublease income of RMB 707,009 (US$99,822), and sublease cost of RMB 858,098 (US$121,154).