Ho Tae lived in Seoul while he was a trainee for a band on a contract. When he realizes that his agency has been taking advantage of him, he comes down to Busan along with his weak mother to settle down. The movie shows the episodes he experiences while he attends a small band academy in Busan.

Chilsung School is for troubled kids. One day, a strange and bleak mood surrounds the school. The teachers turn into zombies. The kids must struggle to stay alive.