Is your younger brother who has been out of touch for 12 years a student in the class? Have you become a colleague with your former head teacher who knows you well? At the parent-teacher meeting, the father that your younger brother brought to you is not your biological father? Can't afford an iPhone XS, so you can only teach Class X? Mo Mo asked the heavens speechlessly, why is it so difficult to be a teacher! Class X, known as the "bad class" in the world, is a unique product of Xingzhi High School. It gathers a group of students who are naughty and mischievous, and have the label of "non-recyclable garbage" on them. Rookie teacher Mo Mo originally took it as her responsibility to educate students, but she never thought that after coming to Class X, her teaching career would be to keep her job as the top priority. The whole class had 2 demerits per person, and everyone was frantically testing the edge of being expelled. Mo Mo had to bet her teaching career, guarding against the monkey cubs causing trouble all day long. Fortunately, Mo Mo was once a top "little girl", and the "bad students" in Class X were not good enough in front of her. When it comes to tricks such as skipping classes, fighting, and cheating, Mo Mo asked herself if she was the originator. Mo Mo firmly believes that under the whip of "little fist of love", the students of Class X will be able to get back on the right track...