A group of young people with different professions and aspirations took part in a trip to escape the city and return to nature, but they encountered an unexpected incident. An unmarried couple was killed one after another, and everyone was panicked. The fog was piled up, and everyone returned to the hotel to wait for rescue the next day, but someone was stabbed with a sharp knife and died tragically in the room. One by one, people left, and everyone was in a panic. A hotel in the mountains became an inaccessible island with deadly dangers. The truth behind the layers of fog made everyone sigh...