Lin Xiaotian, Song Anran, Xu Mingzhe, Li Yutong and others spent three years of their youth together in a high school called Ruizhi Middle School. At first there were many contradictions, conflicts and misunderstandings occurred frequently. With the arrival of new classmate Shen Zhiyuan, the class atmosphere has taken on a new look. Academics, emotions, family and dreams are constantly intertwined, and friendships and conflicts coexist. In group activities, college entrance crises, emotional twists and turns, and growing pains, everyone gradually understands the value of understanding and tolerance, and finally joins hands to move towards a new starting point.