Legal analysis: It is best to sign an agreement, because the operation agreement is a written document formed by the performer and the beauty seeker in the informed situation, so that when there is a medical dispute after the operation, it can be used as the legal document basis for handling the dispute. Signing the operation agreement not only shows the seriousness of the operation, but also provides legal protection for the beauty seekers.

Legal basis: Article 119 of the Civil Code of People's Republic of China (PRC), a legally established contract is legally binding on the parties.