In a dark and cramped space, horror novelist Lee So-hee (Park Han-byul), unemployed college graduate Choi Chik-ho (Kim Ki-seok), and high school girl Park In-jeong (Park Jin-joo) woke up from a coma. They didn't know each other and didn't know when they came here. After the initial panic, the three of them groped their way out of the basement and into a nearby house. The house is fully equipped and full of life, but no other figures are seen. They tried to escape from the forest, but they couldn't find an exit. At the same time, strange events happened around them one after another, and inexplicable panic swept everyone's heart. It seemed that there was a murderer in the darkness ready to take their lives at any time. After reminding each other, their lost memories gradually revived, but it seemed to be a terrifying truth that was difficult to face...