Jin-myung is a psychiatrist and exorcist. Together with his assistant Ji-kwang, he is traveling around in South Korea and helps the victims of demonic possession. His latest mission is to cure Geum-Joo, who terrorizes her environment against her will but without the usual signs of demonic possession. Even Jin-myung fails to help her at first, so he decides to take some research which leads him and Ji-kwang to a forbidden cave that is the origin of some dark legends.