The Inside (2012)

Mike (Paul Stafford) has been alone in a room for weeks, and is slowly beginning to lose his mind. He must stay inside for his own survival. The reason is unclear, but soon, after he is visited by a strange entity in the form of a beautiful woman (Shina Ha), her darker side foreshadows the grim future awaiting Mike that is set in stone by a phone call he receives from a strange, yet sinister voice. It isn't long before the situation is compromised and he must leave the room to fight for his survival.