At 39, Li Xinyue has a one-night encounter with a young man, Cui Can, at her divorce party. Two months later, she discovers she's pregnant, only to learn that Cui Can is the project liaison. Upon hearing the news, Cui Can confesses to his family and proposes to her, leaving Li Xinyue to consider his offer. Meanwhile, her ex-husband, Shu Dabin, continues to pursue reconciliation, and to avoid his harassment, Li Xinyue agrees to a trial marriage with Cui Can. Though they clash frequently, their feelings for each other slowly grow. Shu Dabin demands a paternity test, which reveals the child is his. Li Xinyue decides to part ways with Cui Can, but eventually, Shu Dabin's scheme is exposed, and he faces legal consequences. Li Xinyue confirms the child is Cui Can's and marries him, eventually giving birth to twins.