About the title
Edwin promises his sister on her deathbed that he will find the son she gave up long ago. Edwin's search leads him to become a substitute teacher at a juvenile delinquent secondary school in Duri, Jakarta. There he has to confront the most violent students in order to find his nephew. When he finally finds the boy, a citywide riot breaks out, and Edwin finds himself trapped in the school, with the violent children thirsting for his blood.