Legal analysis: after the borrower obtains the loan, he will tear up the loan and can sue as long as there is other evidence. An iou refers to a bill written to the other party when borrowing personal or public cash or goods, that is, an iou. After the money and goods are returned, the bill is revoked or torn by the bill holder. This is a document.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 667 A loan contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668 A loan contract shall be in written form, unless otherwise agreed between natural persons.

The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 When concluding a loan contract, the borrower shall, at the request of the lender, provide the true information about the business activities and financial status related to the loan.