A young banker wakes up from a coma and finds himself locked in a room that looks like a safe. In addition to the locked iron cabinets and the dead bodies of rats with maggots beside him, there is also an indestructible steel door in front of him. He doesn't know why he is here, but he accidentally finds the hidden key to the iron cabinet. When the iron cabinet is opened, he realizes that he is trapped in an escape game against time.