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 suspect Wang Jia-ying gradually ignites his desire for the truth. As A-Hao edges closer to cracking the case, Wang Jia-ying begins exhibiting signs of demonic possession. Despite opposition from everyone around him, A-Hao insists on exhausting all possibilities to uncover the truth, not realizing he has already fallen into a trap weaved by lies and conspiracy…

A has-been newscaster Liu Li-min is taken hostage by an escaped inmate Zhang Zheng-yi, who pleads his innocence. To Liu's astonishment, Zhang claims that he was smeared by Liu's departed wife. Thus, Liu teams up with Zhang and reinvestigates Zhang's murder case to help his beloved be cleared of blame. However, the more they get to the bottom of the case, the further the truth is beyond their reach.