Together with his parents and his beloved older brother Yoo-seok, 21-year-old Jin-seok moves into a new house. The previous owner left his belongings in one room, and the father tells his sons not to enter it, but Jin-seok constantly hears strange sounds coming from it. He is preparing for exams and taking pills, so the family believes that he is hearing things. One day, Yoo-seok's younger brother is kidnapped in front of his eyes. He returns 19 days later, with no memory of his disappearance, and appears to be a slightly different person.