Devil in the Heart

Falsely accused of murder Na Okmin is arrested In the next cell Suh Pilsun sits his eyes focused on the ceiling He has an old booklet and a necklace with a strange pattern He gazes at Okmin Okmins mother is murdered Pilsun dies in prison Pilsuns old booklet and necklace have been placed at the head of Okmins bed Afterwards Okmin is found not guilty and released from jail Those involved in the murder of Okmins mother are killed off one by one Suspecting that Okmin is the serial killer the investigators look into every detail They realize that the murders occur when Okmin is asleep It is revealed that Okmins spirit had been killing those responsible for her mothers death