The story takes place in a remote mountain city in the 1980s. Miao Wanqiu (played by Yu Qian), an outstanding teacher at Nansu No. 1 Middle School, is full of confidence and welcomes a new batch of high school students. On the first day of school, the domineering teacher Miao gave this group of students with flamboyant personalities and many problems a warning. Whether it was the unruly gangster Luo Xiaoyi, or Wang Hai, who was full of ghost ideas, whether it was the opportunistic mouse, or the vain and flamboyant Guan Tingting, they were all subdued by him. It's just that these children obeyed on the surface, but secretly started a protracted war with Miao Batian. In the course of the war, the domineering Miao Batian showed his warm side from time to time, and his ancient and chivalrous heart made the children secretly admire him. Three years passed in a blink of an eye, and the ignorant children gradually grew up, and they seemed to begin to recognize the truest side of Teacher Miao...