A boyfriend, who can barely speak English, embarks on an overseas trip with his girlfriend, who takes charge of planning everything and even handles communication on his behalf. However, their journey turns into a nightmare when they barely make it to their accommodation, and strange knocking sounds start emanating from the room. To make matters worse, the girlfriend disappears while taking a shower, and the police immediately suspect the boyfriend. With meticulously crafted initial ominous situations, such as the flight delays, the rental car agency closing its doors, and a major traffic a...