Jin-myung is a psychiatrist and an exorcist. Along with his assistant Ji-kwang, he travels through South Korea and helps victims of demonic possession. Her latest mission is to heal Geum-Joo, who is terrorizing her surroundings against her will but without the usual signs of demonic possession. Even Jin-myung can't help her at first, so she decides to do an investigation that leads him and Ji-kwang to a forbidden cave that is the source of some dark legends.