The drama tells the story of a school where a juvenile crime as brutal as a social incident occurred, but the punishment was not strong enough because they were teenagers. In the drama, Yoon Jun-sang is a lawyer with the highest winning rate, but he fell into the abyss due to an incident. In order to restore his reputation, he entered the high school related to the incident as a temporary teacher. When he was a teacher, he was shocked by the various juvenile crimes that occurred on campus. He stood on the side of the disadvantaged students and spoke on their behalf.