Song Susu catches her fiancé Shen Rang betraying her, and her life spirals out of control. Just when she is at her most vulnerable, Xie Qinghuai, whom she hasn't seen in three years, reappears. This man at the pinnacle of Nancheng, seemingly cold and aloof, repeatedly backs her up and pulls her out of her past relationship bit by bit. Their relationship quietly changes through day-and-night companionship. And when Shen Rang regrets and tries to turn back, Song Susu finally sees clearly that what is truly worth cherishing has never been a late repentance, but the person who has always stood firmly by her side.