All of Us Are Dead EP 1 [ENG SUB]

A gang of bullies corner Hyosan High student Lee Jin-su on the rooftop of a building. He tries to fight them off, but is pushed off the roof and left hospitalized. He vows revenge against his bullies before turning into a zombie at the hospital. Lee Byeong-chan, Jin-su's father and a science teacher at Hyosan High, takes his body home, and Jin-su is declared missing. Several days later, student Kim Hyeon-ju is bitten by an infected hamster in the school's science lab. Witnessing this, Byeong-chan locks her inside the lab. She escapes the next day, albeit severely ill. She bites school nurse Kim Kyung-mi in a frenzied state and is transported to the hospital for further care. Police arrive at the school and arrest Byeong-chan. Shortly afterwards, Kyung-mi turns into a zombie and attacks several students, triggering a virus outbreak within the school.