A student, Go Nam Soon (Lee Jong Suk), studies at a Seungri High School, where he is always bullied by a gang led by Oh Jung Ho (Kwak Jung Wook). At the beginning of the school day, his class 2 gets a new homeroom teacher called Jung In Jae (Jang Na Ra), who finds it hard to control the class. Later, a new teacher named Kang Sae Chan (Choi Daniel) arrives at school. He is appoi...