Jongin is the son to the owner of YEOLDU Electronics and due to a threat about burning their house down from an anonymous killer they decide to move to Busan for a year so they not get in danger while the police investigates the case. The happiest of them all over the move was Jongin who could not wait to start at a new school. Jongin was popular at his old school as the "y dancer" that every girl at least slept with once. Now when Jongin is starting at a new school his desire of girls increases and he is excited for his first day. Little does he know that it is not only the girls that will play with his heart.