Dr Yoshimura has been conducting experiments in “facial transplants” to help burn victims. The limited success of his experiments requires him to have a steady supply of face donors--regardless of whether or not they are willing to “donate”.

A butterfly flies from the mountain to the city. Sang-Kyu, who works in a company, buys a house in the suburbs and lives with his wife and daughter, Yun-Jeong. But Yun-Jeong becomes a somnambulist because of the illusion of a butterfly flying to the house. Sang-Kyu happens to know Mi-Wu, a singer, who loves Song Cheol-Ho but wanders in her life after his death. On the other hand, Yun-Jeong regains her consciousness with the help of an English psychicist and a nun. After Sang-Kyu has a sex with Mi-Wu, he falls out of the window and loses his consciousness. As she feels affection for Sang-Kyu, Mi-Wu becomes a butterfly in the soul world and leaves him.

Keon wants his friend's girlfriend so he tries to take her by force but she gets away. Instead, she runs into a truck driver who rapes and murders her. Keon is wracked with guilt. As the investigators close in on Keon, Madam Sun-wu hides him. Keon becomes Madam Sun-wu's toy-boy. He also becomes a nude model for Ma Mi-ae, Madam Sun-wu's friend. Mi-ae is drawn to Keon. Mrs. Yun, whose husband is impotent, also looks to Keon to satisfy her desires. As the investigation's net tightens, Keon's life falls apart. Mrs. Yun dumps Keon on a road in the middle of the night. The prostitute Lan helps Keon out. However, in despair, Keon runs out into the rain and screams. On TV, the news broadcast the capture of the real criminal.