The story tells that Gu Siyuan transferred to a new high school and gradually established deep friendships with class members Lin Jiaqi, Han Tianyu, Su Xiaoxiao, Zhao Yu and others. They supported each other during their three years of study and life, and experienced growing pains, emotional twists and collisions of dreams together. Not only do they have to face conflicts among peers and family pressure, but they also have to make choices and breakthroughs at key nodes such as college entrance examinations, clubs, and teacher-student conflicts. In the end, everyone achieved self-transformation and understood that youth is not only about achievements, but also a testimony of bravery and passion. The book has a tight rhythm, humor, ups and downs, and is both passionate and tender.