Zhao Yimu is a lively boy with a smart mind. He is interested in everything. With his age, he has done more than boys of the same age in middle school. He has two good classmates, one is Huihui, a girl at the same table, and the other is Hu Xiang, a boy in the same class. They are in the same school and class from primary school to junior high school and high school, which is rare.