In Hyosan High School, bad things are happening. Some students, including the son of teacher Lee, are consistently subjected to bullying, and the school administration turns a blind eye. When one student is bitten by a laboratory hamster, Lee isolates her and comes under suspicion of kidnapping; the injured student is taken to the hospital, and the teachers, despite his protests and pleas to declare a quarantine, report to the police. The zombie virus infection has already spread to the school nurse and has begun to rapidly take over the students, and now, to avoid being caught by their former classmates, the few surviving students will have to display all of their skills and ingenuity.