Yun tide is an ordinary white-collar worker, independent and strong, and dependent on her mother. Her mother disappeared three years ago, and Yun Xi has been searching for it to no avail. One day, Li Yehan, the president of the Li Group, suddenly came to the door, holding a marriage contract and claiming that she was his fiancée. Yun Xi was shocked and resisted, but Li Yehan had a tough attitude and revealed that the marriage contract was signed by her mother. In order to find out her mother's whereabouts, Yun tide agreed Playing the role of the fiancée; after entering the Li family, she encountered difficulties and temptations from the second uncle of the Li family and other members; Li Yehan was cold on the surface, but secretly rescued her many times; Yunxi found half a photo and a recording left by her mother in the study room of the Li family's old house, suggesting that her mother had reached a secret agreement with the old man of the Li family; she began to suspect that her mother's disappearance was related to the internal fighting in the Li family Li Yehan was also investigating his father's past events, and the two joined forces for a common goal; they found that their mother was imprisoned in a suburban nursing home, but someone was secretly obstructing it; Li Yehan's father, Li Yuntian, was the person in charge of the project that year, and his mother became a scapegoat after the project failed; Mr. Li felt guilty in his later years and left clues in his will; the second uncle of the Li family did anything to seize power. The method is to kidnap Yun tide; Li Yehan rescues alone, and the relationship between the two escalates; Yun tide's mother is rescued in the end, but her memory is disordered; Li Yehan chooses to disclose his father's crime to protect Yun Xi; the family breaks up, and Li Yehan gives up his inheritance rights; Yun Xi helps his mother recover her memory, and the truth is revealed; Yun tide and Li Yehan confirm each other after experiencing life and death, and start a new life