In interpersonal relationships, mistresses are always a topic of great concern. The mistress phenomenon raises ethical dilemmas involving the rights, responsibilities and respect of all parties. From an ethical perspective, the involvement of a third party violates the partner's commitment and respect. However, there may be problems in the partnership itself, and the presence of the mistress only exposes these problems, or it is not uncommon for the mistress herself to be a victim. Therefore, ethical dilemmas require a balance between individual rights and moral responsibilities. The term mistress usually refers to a third party who interferes in other people's marriages or emotional relationships. Fraud refers to the act of obtaining personal property or benefits through deception, false advertising or other means. In this article, we will focus on a character named Yan Limeng.