Qiao Xi, a sophomore girl from Haizhen High School, is more than intelligent, but she is known as a "poor student" in the school. She plays tricks on teachers, bullies classmates, and has average grades. She has already become the type of "one can give up" in the eyes of teachersStudents and academic achievers Qu Lanlan are two extremes. With the college entrance examination approaching, Qiao Xi was invited by her homeroom teacher to her parents for helping her classmates hide cigarettes and not willing to sell them. The homeroom teacher had a dispute with Qiao's mother, and the homeroom teacherEmotionally excited and giving birth prematurely. The principal was forced to temporarily replace the new Chinese teacher Sun Diyi as the class teacher. Teacher Sun is an idealist who advocates teaching students according to their aptitude, igniting the hope of Qiao Xi's academic journey.