Kang In-ho (real name:Gong Yoo) and Seo Yoo-jin (real name:Jung Yoo-mi) are the main characters of this movie. Kang In-ho is a teacher who started for his new post as a music teacher in Mujin Jayae school. At first, he ignored the situation that occurred in school for his family. However, he changed his mind while he watched mistreatment toward the disabled students. Finally, he decided to help poor students and fight against powerful men in a school. Seo Yoo-jin is a human rights activist in Mujin. One day, she knew that the disabled students in Jayae school were physically attacked by school officers. And then, she started aggressively resisting school with Kang In-ho.