Su Xiaoyu and Gu Yanze were childhood sweethearts who grew up together. Gu Yanze pampered Xiao Yu like a little princess since childhood. After entering college, the two were admitted to the same school, and Gu Yanze turned into a "wife-protecting maniac", helping Xiaoyu occupy seats, ward off romantic opportunities, and solve academic problems. Xiaoyu gradually understood her own feelings under Gu Yanze's love, and Gu Yanze had been waiting for her to grow up. The promise from school uniform to wedding dress is slowly realized in the time of youth.