Wang Qiang (voiced by Xing Yuanyuan), the most mischievous "bad student" in Class 3 of Junior High School, and Shi Miaona (voiced by Wang Bowen), the "irritable class teacher", accidentally swapped bodies. Wang Qiang, who had been oppressed for a long time, got his fill of being a class teacher, and Shi Miaona also experienced what it was like to be a "bad student". As the date of Shi Miaona's open class competition approaches, the two urgently need to find a way to swap back their bodies, but they encounter many obstacles...