The Taste of Next Door Sister.

Seong-il and Hyun-jung are a couple. Seong-il loves sex. However, Hyun-Jung is fed up with the sex demands of Seong-il who is too obsessive. Hyun-jung talks with her senior about her husband's complaints. Minwoo, who lives next door, comes outside and accidentally listens. Minwoo, who was usually interested in Hyunjeong, pretends to be a coincidence and helps Hyunjung to throw away the trash. Min-woo, who is favored by Hyun-jung, asks sex partner Yoon Kyung to twist her. Disguised as a gas inspector, Yun Kyung visits Seong-il's house and seduces Seong-il to succeed. After that, Sung-il tries to have sex with Hyun-jung, but Seong-il...