The K24 train, en route to the provincial capital, stopped on the way due to a landslide. At this time, eight passengers in the sleeping compartment were in a coma at the same time, and one of them never woke up. During the investigation, police officer He Hye discovered that all eight people were involved in the accident of a young girl’s death ten years ago. Even more disturbing, everyone who woke up saw the girl’s figure in hallucinations. And today, ten years later, a confession of redemption, a belated justice, or the ghost of a dead girl?