Seungri High School ranks as one of the worst of 178 high schools in Seoul based on academic scores. Jung In Jae (Jang Nara) begins her career as a teacher here. Se Chan (Daniel Choi) also starts to work at this high school and as the top Korean language teacher at a famous institute in Gangnam. Class 2 is at the bottom of the grade (2) at Seungri High and that was the reason why they hired Se Chan, in hopes of improving the scores of the students. Jung In Jae was supposed to leave and Se Chan becomes the homeroom teacher of the class, however, unable to leave her students and thinking she should still stay with them and help them go through their teenage years, she stays. In Jae and Se Chan begin working together as homeroom teachers as they try to bring the scores up as well as help the students.
The teenager that we mainly follow is Nam Soo. Nam Soo ends up being the class president of grade 2. He had problems with Jung Ho who is a gang member and yet Jung Ho was the one who made Nam Soo the class president. However, becoming class president still brings on problems as Jung Ho continues to bother Nam Soo. Nam Soo also does whatever is possible to keep Jung Ho from bothering Jung In Jae, the teacher, as most teachers abandoned this class as they found it difficult.
Not only does this drama revolve around the lives and the struggles the adults have to go through in helping these kids but also the lives of the students. The students also have a lot going on in their lives and the different friends they make and so forth. School 2013 show how teachers and students grow up and mature through the conflicts and compromises that occur in their lives.