Zombie School (2014)

At Chilsung School, a reform institution for troubled teenagers, an ordinary school day turns into a terrifying fight for survival when the teachers mysteriously transform into zombies. The outbreak begins after a diseased pig escapes from a burial pit and infects the principal. As the infection spreads throughout the campus, Jung-sik and his fellow students must overcome their differences and find a way to escape the nightmare before the school becomes their final resting place.