Xiong Bo, principal of Jiaying Middle School, decided to start small class teaching in senior three. In order to let children truly appreciate the happiness brought by quality education, Xiong Bo hired a middle school teacher, Gu Yuetao.

At the opening ceremony, Gu Yuetao and Pepe were surprised to find that the other actually taught in the same school. Pepe can't believe that Gu Yuetao is the teacher who is mythologized by everyone. He is flamboyant, childlike and likes to show off. Gu Yuetao also realized that Pepe, like herself, is also a teacher in Jiaying Middle School.

At the opening ceremony, Gu Yuetao made a fool of himself, which made most teachers and students feel extremely disappointed. Gu Yuetao's behavior puzzled teachers and students. After the placement, the elites of all classes gathered in Gu Yuetao's class, which really made the new class teacher miserable. The class he was in charge of fell behind the whole grade in the first exam, and his Chinese class became the penultimate in the whole grade. The children's trust in him has dropped to freezing point. Faced with Shi Yanfeng's criticism, female students' showing off and comparison, the problems she encountered when she just transferred to another school, the consequences caused by the deterioration of the relationship between Wang Chen and her mother, the conflict between Lan He and the heroine in the play, and Wang Junze's arrogant personality, Gu Yuetao regarded herself as a student's friend with tactful and patient methods, and successfully adjusted the children's mentality. He turned a multi-task class into a sunshine team. He used a step-by-step method to make the whole class truly realize that quality education is sunshine education. He let the children experience and accept a quality education model he advocated.

In the graduation exam, the children rewarded the teacher with amazing results. He conquered those who doubted him with facts. At this time, Pepe finally walked into his heart.

The students were going to break up with him, and he explained his unique education method to the children. He said that he would always be a friend of the children, not a teacher. He hopes that all children should have their own space and study in a relaxed environment. He wants every child to be a sunny teenager, and he wants to give them an eighteen-year-old sky with his own actions.