Synopsis：While preparing for a campfire at his father’s summer house, Geonhee and his friends suddenly find Ji-ah unconscious, blood drooling from her mouth. Panic erupts, but Geonhee calmly checks everyone’s alibis and narrows the suspicion down to Yumi, who vehemently denies it. Locked alone in an isolation room, Yumi can only wait as the others search for clues. What really happened that night, and whose hidden deed triggered this horrifying incident?