As an adult, Xu Yongxin ran into his high school classmate Zheng Dawei. Their long-lost encounter brought back the sweet and sour campus memories - time went back more than a decade ago, when Yongxin was a good student who studied hard. Because of an accident with a notebook, her life collided with that of her classmate Du Yaxiu. As she got to know him better, she discovered that Yaxiu, who looked like a bad student, actually had a kind and enthusiastic heart. Through Yaxiu, Yongxin, who originally only knew how to study, also made many good friends, including the sunny sports boy Zheng Dawei, the beautiful and arrogant goddess Gao Yuxuan, and the gentle and gentle Zheng Dawen. These people accompanied Yongxin through her entire youth, facing the anxiety and doubts of growing up together, and talking about young dreams and feelings together, laughing together, crying together, and never being afraid of falling, because knowing that there is always someone supporting you and encouraging you to stand up again and run towards the future!