Yu Zhou Zhou and her mother have always depended on each other. On the first day of primary school, Yu Zhou Zhou falls down and thus gets to know a boy named Lin Yang. Lin Yang helps her to adapt to school and the two of them become best friends. However, due to some rumors, the two gradually drifted apart. But they meet again at Zhen Hua High School and grow up together, experiencing all kinds of joys and sorrows. After high school graduation ceremony, everything comes to an end but the memories of youth will last forever....