An accidental exchange of room cards caused Chu Ruo Yun to accidentally fall into a contractual marriage with her best friend and boyfriend Long Hao Tian. Although it was a commercial marriage forced by the interests of the group, Long Hao Tian was dissatisfied with the Chu family's bullying of Chu Ruo Yun, and still domineeringly proposed to protect his fiancée. The two fell in love unknowingly, secretly promised their hearts, and decided to get married sweetly. But the appearance of the ex-boyfriend and the sudden return of his best friend broke everything that seemed peaceful...