Jung Yoo-mi and her students come to Yoo-gok Elementary School in a rural town as a part of an exchange program. They are spooked by a campus ghost story told by Kim Gye-dong, a teacher at the school. But the students' curiosities get the better of them and they decide to search every nook and cranny for the ghost. Unfortunately, it is Yoo-mi who runs into the ghost when she goes to the bathroom at midnight. The campus ghost story now becomes real to everyone at the school. The fearless threesome, Tae-suk, Chul-soo and Hoon, decide to go to the annex building where the ghost is believed to reside in. But Man-duk warns them vehemently against going there. When Tae-suk receives a message that the school is cursed, he and his friends sneak into the annex building to uncover the mystery once and for all. His friends are chased by the ghosts and now Tae-suk must find his missing friends.
In the last years of Koryo, there lived a family of hunters deep in the forest. Chang-su is head of the family. He lives with his brothers Man-su and Jong-su, who are past the age of marriage, his wife Sam-ok, his son Bok, and his daughter Sun-ie. When the three brothers go hunting, Mt. Baek-rang bandits kidnap Sam-ok and carry her away. The bandits demand the skin of thousand-year-old wolf living in Mt. Baek-rang in exchange for Sam-ok. Chang-su catches the thousand-year-old wolf and gives it to the bandits. But the moment Chang-su and Sam-ok are reunited, Chang-su mistakes her for the wolf and kills her accidentally. Chang-su and his brothers fall into despair. Man-su coincidentally meets Jin-jin, the granddaughter of Old Man Hwang and they get married. However, Jin-jin is actually a female wolf who has come for revenge. She kills Man-su and Jong-su. As she approaches Sun-ie, she shoots an arrow and…
