Jang-woos little sister has been murdered, but there is hardly any evidence that could lead to the killer. The police has little hope to catch the murderer. Desperate to take revenge, he searches help by a female shaman who connects him with a young woman. The young woman is a medium who agrees to help Jang-woo. The images she sees are leading them to the pharmacist Min Yak-gook, who is followed by Jang-woo everywhere he goes. He develops an obsession to proof Min as the killer of his sister. But the true murderer also know he is being watched and aims Jang-woo and the young woman.