Sang Jin teaches in the department of music. Soon, Jang Ho, a hooligan and troublemaker, arrives to his class. Incidentally, Jang Ho was responsible for an accident a day earlier in which Sang Jin was also involved. At first, both of them quite dislike each other. But everything changes when Sang Jin discovers Jang Ho's true talent. Helping him develop his passion, he also tries to support him in breaking away from his problematic past.