Thirty-five children who had just entered the first grade (3) of the town middle school were like a group of runaway "magical beasts" that crashed into the life of class teacher Li Jianguo - the left-behind child Wang Xiaoye brought the "wildness" of the children in the village and hid loaches in the chalk box in class; Lin Xiaoya, a divorced family, always locked herself in her seat, with secretly drawn photos of her parents in her textbook; Zhang, who grew up with her grandmother, Strong, in order to "prove themselves", they always compete with others during class to see who can climb the tallest tung tree... Behind them are different families: parents who have been working outside all year round shouting "obedience" over the phone, parents who have pushed each other after divorce and regard teachers as "referees", and ancestors who stubbornly believe that "study is not as good as working". Every parent meeting can make Li Jianguo laugh and cry.