At the beginning and end of the contract, the ID number is signed next to the name to avoid the defendant arguing that the signer has the same name as himself. Because the name may have the same name but the ID number is unique, it is usually recommended to sign the ID number together.

3. If the signature of the contract is inconsistent with the ID number, the signatory of the contract is usually regarded as the party to the contract. However, in some cases, the judge uses the person corresponding to the ID number as the guarantor of the contract. The general reason is that the ID number is unique. This person writes down his ID number in the column of guarantor, indicating that he is willing to guarantee.