In the summer of 1996, Yang Xi, a sprinter who was about to enter the third year of high school, was injured in the leg by the shock wave of the chemical experiment explosion while chasing the "car thief", and could not participate in the long-distance running competition that could add extra points to the college entrance examination. At the beginning of the school year, Yang Xi found that the boy who caused her injury had transferred to her class and became her classmate, and also took away the position of class monitor that she wanted to be re-elected. And this boy was Hua Biao, a passionate, righteous and brave science genius. Hua Biao's sudden arrival made the whole class of students feel a little "as if they were facing a great enemy", and as he saved the class's qualification for the Mid-Autumn Festival Gala, showed his amazing gaming skills and stood up for his brothers, Hua Biao successfully integrated into the third class of the third year of high school. In the process of unilaterally confronting Hua Biao, Yang Xi gradually discovered that Hua Biao was not only responsible and righteous, but also filial and dedicated to taking care of his grandmother, so she put aside her prejudice and accepted him. Since then, Hua Biao, the "Brother Biao", Yang Xi, the "speedster", Li Yu, the "business genius" Situ Ertiao, and Yang Xiaohemei, the "sweet girl", have officially formed the "Flying Five" and are dominating the campus. In this unusual summer, Hua Biao and Yang Xi's immature first love, Li Yu and Huang Chengcheng's unrequited love, and Yang Xiaohemei's secret love for Yang Xi's brother Yang Chao are brewing... Along with the young people's ignorant feelings quietly sprouting, the choices about dreams and the future also quietly come. This summer is brighter and more lively because of being 18 years old!