Police detective A-Hao investigates a mysterious stabbing by a teenage girl who appears to be possessed by a malevolent force. Once a passionate detective, A-Hao retreated from the front lines several years ago after mishandling the investigation of a wife killer. By chance, he stumbles onto a mysterious stabbing allegedly committed by a teenage girl, which drags him back into the investigations unit. Initially, A-Hao just wanted to quickly close the case, but his investigation into mysterious...