Tang Hui, a gifted traditional Chinese medicine doctor, is betrayed by her fiancé, who suspects her because of the bite mark on the back of her neck, a reminder of a reckless moment in their youth.
In high school, she was cruel to eighteen-year-old Fang Lueying, pushing him to split into multiple personalities and leaving behind a wound that would bind them for life.
Years later, Fang Lueying has become a top-tier star of the tennis world. When an old arm injury brings him to her for treatment, he reunites with her, and his gentle alternate personality falls in love with her.
But her former fiancé refuses to let go and keeps pestering her. When an unexpected incident triggers Fang Lueying’s obsessive primary personality, everything changes.
The primary personality, driven by old grievances, hatred, and love that never faded, deliberately treats Tang Hui coldly and keeps her at arm’s length, wanting her to experience the pain he once suffered.
But after spending day and night together, their love has already taken deep root. In the end, his revenge is futile.
