The well-behaved heroine Ruan Zhi, who is a master of academics, refused to marry a wealthy family in order to complete her studies and entered the university incognito. However, she happened to be seated at the same table with her fiancé Gu Chen, who she had never met before. Gu Chen has a "Bai Yueguang" in his heart that he has been looking for for many years, and he dislikes Ruan Zhi, his "stand-in" and his deskmate next to him. Ruan Zhi holds the script in hand and calmly eats the melon, until one day, Gu Chen discovers that the "White Moonlight" photo he has carefully treasured for many years is the youthful appearance of the "little stand-in" next to him seven years ago...
