A high school girl who has not yet been deeply emotionally involved meets a man who occupies her youth - Su Zhimu, a teacher who is ten years older than her. One is an ordinary high school girl who is looking forward to a colorful high school, and the other is a university professor who only teaches the first year of high school for teaching and research tasks, but they meet and become a sudden light in each other's life. Obviously they are all outstanding people in their own lives, but some people are running away.