Do Kyungsoo is going into his 3rd year of teaching.  He loves his career, and his new Teacher's Aide, Jongin, offers a new incentive to stay enthusiastic about his job and his students. However, with a change in regime at his school, darker forces come into play and Kyungsoo and his department find themselves fighting for the students, and themselves, in a terrifying battle against discrimination and bullying that goes right to the top of the Education Department itself.