Shin-ae meets Hyon-pyo by chance at a nightclub. When the news reports a murder, she instinctively senses Hyon-pyo's involvement and begins investigating with her boyfriend, Dong-min. During the investigation, Shin-ae learns that Hyon-pyo lives off his in-laws, is a womanizer, and that his wife, Mi-hwa, is paralyzed in the lower body and a wreck. She also uncovers that Hyon-pyo is having an affair with his half-sister Yu-mi, and that he forced his sister into a strategic marriage to secure business funds. As Shin-ae tracks Hyon-pyo's complicated relationships with women, the women are murdered one by one. During their pursuit, Shin-ae and Dong-min discover that Mi-hwa, whom they believed to be paralyzed in the lower body, can actually walk, and they begin to suspect her.