One day, Yeongjun's younger sister, Soyoung, falls ill with a strange disease after returning from an MT (membership training). To unravel the bizarre phenomena happening to her, Yeongjun seeks out his distant relative, Doyeon, who has spiritual abilities. However, Doyeon pushes Yeongjun away. As the two of them struggle, an unidentified entity appears before them, bringing a series of horrific events. Haunted by ghosts and uncovering Doyeon's dark past, what fate awaits the two of them?