Sun-Joo (Ryoo Hyoun-Kyoung) wants to go to Mt. Jiri with her boyfriend Kyoung-Woon (Heo Jeong-Min), but because of Kyoung-Woon she can't go. Sun-Joo is disappointed and drinks alcohol. At that time, she happens to meet writer Joon-Ki (Jung Eun-Woo). Sun-Joo is attracted to Joon-Ki. They kiss on the first day they meet. After the kiss, Joon-Ki suggests that they go see the morning sea together. Sun-Joo accepts, but when gets to the car she finds Joon-Ki's friend Dong-Soo (Lee Joo-Seung) in the car.

As the sun rises, Joon-Ki acts strange. Sun-Joo becomes frightened by his weird behavior and Dong-Soo also makes her uncomfortable. Sun-Joo wants to go back to Seoul, but they go to see Joon-Ki's friend in Gangneung.

To get away from them, Sun-Joo contacts her friend Myoung-Hee (Song Min-Ji) who lives also in Gangneung. Sun-Joo finally gets to Myoung-Hee’s house, but Sun-Joo doesn't know there is a monster more strange than anyone else in Myoung-Hee's home.