Shuai has always wanted to improve his grades, because his status as a scum has been unfairly treated in the classroom. Shuai thinks that grandma will find the reason for her poor study, so she turns into a movable make-up mirror on Grandma's suggestion. Because everyone has a love for beauty, Xueba indulges in make-up every day, But the result of the exam is that both sides get zero points, which is the practice of "harming others but not self-interest". In fact, the mutual help of students is very easy to achieve. Xueba only needs to help Shuai make up lessons after school, and can harvest Shuai's flattery to satisfy his inner sense of achievement. Only the unity of students can make the learning atmosphere strong enough.