Fact1: Japanese man has arrived at little village in mountains of South Korea living in secluded house, Fact2: mysterious young woman called Moo-myeong tells him about Japanese stranger, Fact3: other police officer finds pictures of infected, Fact4: stranger 's house guard dog attacks deacon and Jong-goo, Fact5: hands over shoe belongs to Jong-goo 's daughter
Output: A Japanese man has recently arrived at a little village in the mountains of South Korea, living in a secluded house. A mysterious disease starts spreading among the villagers, causing a rash which precedes violent murderous outbreaks followed by stupor and eventually death. Police officer Jonggoo, who is investigating the case, meets a mysterious young woman called Moomyeong “no name” in Korean, who tells him about the Japanese stranger, and later disappears. A local hunter tells Jonggoo that he saw the nearnaked stranger eating a deer, with glowing red eyes. Jonggoo is unsettled, as he has had dreams about this stranger, which the hunter had described to him. He enlists the help of another police officer, and a Japanesespeaking deacon to serve as translator, and they investigate the strangers house while he is away. The other police officer finds pictures of the infected and murdered residents and their belongings. He is too shocked to say anything to the others. The strangers house guard dog attacks the deacon and Jonggoo. The stranger arrives and pacifies the dog, and the other three leave. The police officer tells Jonggoo of what he saw, and hands over a shoe which belongs to Jonggoos daughter, Hyojin. Soon, Hyojin becomes sick and displays similar symptoms as the other infected villagers. Jonggoo makes his way to the stranger’s house with the deacon in anger, but finds that the pictures and evidence have been burned. Infuriated, he destroys the strangers worship room and kills the dog when it attacks him, ordering the stranger to leave the village. Distraught about Hyojins condition, Jonggoos motherinlaw seeks help from a shaman, Ilgwang. As Ilgwang performs a ritual to exorcise the demon, the stranger performs a ritual in his house simultaneously. Jonggoo finds his daughter in pain and interrupts the ritual, taking her to a hospital instead. The following day, he gathers his friends to hunt down the stranger, believing that the stranger is responsible for the disease and murders. Jonggoo and his friends go after the stranger, and are attacked by another infected villager. After a chase they eventually end up hitting the stranger with their vehicle. They dispose of his body as Moomyeong watches from the hills. When Jonggoo returns home, he finds that Hyojins condition has seemingly improved. Ilgwang suspects they killed the wrong person; he later encounters Moomyeong, and starts vomiting blood. He calls Jonggoo, telling him that Moomyeong is the real demon. Jonggoo finds Moomyeong near his house. She requests Jonggoo to believe her, telling him she had set a trap for the demon, but the trap will not work if Jonggoo goes back to his house. Ilgwang calls Jonggoo and tells him not to believe Moomyeong, while she in turn tells him Ilgwang is actually in league with the real demon. Confused and hesitant, Jonggoo eventually leaves to save his family, but Moomyeong grabs him, her skin turning a ghostly white as he notices that she is wearing the personal items of some of the victims. He pulls himself away, and as he crosses his homes threshold, the floral trap withers. The deacon encounters the stillalive Japanese stranger in a cave. After being photographed by the stranger, the deacon witnesses the stranger evolving into a demon. Back at his house, Jonggoo arrives to find that Hyojin has murdered their family. He calls out to her, but she stabs him and falls into a stupor. Ilgwang arrives at Jonggoos house and takes photographs of the family. While returning to his car, he unintentionally drops a box filled with photos of the other victims. As Jonggoo lies dying in his home, he sees visions of happier times with his daughter and assures her he will protect her.