Seven days before the wedding, Xiaoya Jr., a famous radio host, witnessed the affair between a famous writer's fiance Li Mingxuan and his ex-girlfriend Xu Jiawen. Xiaoya Jr. couldn't stand the pain of betrayal and infidelity and committed suicide. Fortunately, she was rescued and revived, but her fiance Li Mingxuan fell to her death. Before the truth was revealed, Li Mingxuan's ex-girlfriend Xu Jiawen died. Li Mingxuan's younger brother, Li Mingyan, always feels strange about his brother's death. After investigation, it was found that the affair was planned by Xu Jiawen and Xue Wei, and before the truth came out, Xue Wei died suddenly. Who's behind this? Is it that lovers separated by yin and yang want revenge? It is a horizontal knife to kill a lover. Or fate is predestined from the beginning of love.