The Coma: Recut (2017)

In this creepy Korean survival-horror you take the role of Youngho, a hapless student who finds himself trapped in the nightmarish halls of his high school. After drifting asleep during his final exam, he awakes in the school at night. The only problem is he's not alone. Relentlessly pursued by a psychotic killer, he must now muster the courage to solve the mystery of why he is here and how to escape.

Storyline

"You were just another normal high school student in Korea. You had just sat down for your final exam, exhausted from an all-night cramming session. The result of all your preparation, and those grueling hours spent studying was dozing off in the middle of the test. You awake to find yourself alone - no one had bothered to wake you when class was over. Night has begun, and you decide to head home. If you can..."