Debit slip with handprint is valid. A debit note is a written document indicating the relationship between the creditor and the debtor. It is generally written and signed by the debtor, indicating that the debtor has owed the borrower the debt indicated in the debit note. If there is no IOU or similar means of proof, it may lead to poor legal protection for borrowing money. It is recommended to make a complete loan contract.
 [Legal Basis]
 In Article 490 of the Civil Code, if the parties conclude a contract in the form of a contract, the contract is formed when all the parties sign, seal or fingerprint. The contract is formed when one party has performed its main obligations and the other party has accepted them before signing, sealing or fingerprinting.
 A contract shall be concluded in writing as required by laws and administrative regulations or as agreed by the parties. A contract is formed when the parties fail to adopt a written form but one party has performed its main obligations and the other party has accepted it.