In the wealthy world of Linlan City, there is only legal recognition, social recognition, and family recognition of blood. After the blind date failed, Lin Wan, the wedding planner and executive, was taken home by Gu Yanci, the heir to the Gu family, and used a three-month high-salary agreement to play the role of Shen Zhiwei, the missing fiancée, to help him stabilize the board of directors, family elders and external public opinion. Lin Wan originally just wanted to take the opportunity to leave, but after seeing the old banquet list, private wards and sealed files in the Gu family's study, she discovered that she and the real Shen Zhiwei were not only similar in appearance, but also had the same birthmark on her wrist. At the same time, she kept falling into the sense of déjà vu in unfamiliar scenes, as if someone had lived her life for her. Gu Yanci used her to maintain order in the Gu family, but gradually lost control as they got along, and began to suspect that behind the marriage between Gu and Chen's family there was a conspiracy to exchange identities that was even more terrifying than the disappearance. After misunderstanding, use, separation and side by side, the two ended the old-style genealogical control together, allowing the tampered life to return, and establishing new rules and relationships based on the collapsed wealthy order.