Hello, I am the insurance agent of China Life Insurance Company in Shaoguan, Guangdong. In fact, the role of guarantee is that if something goes wrong with the person you guarantee, you will be responsible. Otherwise, how can it be called protection? Provide a copy of your ID card and sign a written agreement. Guarantees are definitely risky. If you believe him, you can rest assured. There is no need to sign any written contract or agreement. You should ask him. There must be a written agreement.