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Summary of Significant Accounting Policies - Schedule of Net Revenues By Geographical Location of Customers (Details)	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2022 CNY (¥)
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	¥ 40,595,916	$ 5,647,420	¥ 78,335,376	¥ 983,168,898
PRC [Member]
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	24,986,453		57,485,526	906,347,962
Hong Kong [Member]
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	9,467,603		16,461	33,556,434
Singapore [Member]
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	4,697,243		1,119,872	184,738
The United States [Member]
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	1,094,904		7,115,353	16,278,352
Others [Member]
Schedule of Net Revenues By Geographical Location of Customers [Line Items]
Net revenues	¥ 349,713		¥ 12,598,164	¥ 26,801,412

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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