Dr. Go, an authority in botany, lives in Buldang Village. His house is haunted by the ghost of Ok-nyeo, who has loved his friend, Choe Seong-ho. She has been killed unjustly, and the ghost comes to Dr. Go every night, asking for fresh blood from young women. One day, Jeong-ju, the daughter of Choe Seong-ho and a student of botany, comes to the region with boyfriend Chang-il to collect samples. Dr. Go is possessed by Ok-nyeo and tries to kill Jeong-ju, but Chang-il saves her. When Dr. Go comes back to his mind, everything turns out to be his dream.

When Korea Highway Corporation is about to destroy the grave of O Gong-nyeo, the locals oppose the idea because they are worried of the legend of the grave. Heo, an engineer in charge of the construction, checks into a mountain lodge to investigate the legend. One night, he listens to O Gong-nyeo's grudge-filled story in his dream. However, he is too obsessed with his investigation and has been hallucinating. At last, he leaves the lodge and insists that the absurd legend is nothing but a superstition. He boldly pushes forward the construction project.