Seon-woo and Eun-gyeol, two old friends who grew up together since their snoring days, live together with their wives even after marriage. As time goes by, the two begin to lose interest in their relationships with their wives, Ga-hee and Jeong-eun, and decide to try swapping. After swapping, Seon-woo and Eun-gyeol's friendship begins to crack, and they start to covet each other's wives at will. In the end, Ga-hee and Jeong-eun leave their husbands.

Ga-yeon is tired of her kind and innocent husband, Shin-woo, so she has an affair with adulterous man Dae-ho. As soon as Shin-woo goes on an overseas business trip, Ga-yeon calls Dae-ho home and lets him disguise himself as a robber and have sex with him. However, Shin-woo suddenly returns home and witnesses the affair. He suffered from guilt when his wife had sex with another man in front of him. In the end, Ga-yeon leaves home, and Shin-woo, who thought he would have a hard time without her, is rather happy.

Eun-ji and Shin-ae are lesbian lovers. However, Eun-ji is forced to marry Jae-seong due to her parents' torches. Due to Jae-seong's severe paranoia, he suspected his wife Eun-ji, who is unhappy with their marriage, of her relationship with Ho-jeong, Shin-ae's senior, who lived next door. With the help of Shin-ae, Eun-ji divorces Jae-seong, and Shin-ae approaches him for Eun-ji's revenge.

Joo-man starts an affair with the younger Jin-nyeo and drives out his wife, Soon-jeong. Soon-jeong, who was kicked out to an empty house, meets a robber, Do-sik. At first, she was bullied by Do-sik, but she turned it around and began abusing him instead. Do-sik suddenly falls in love with Soon-jeong, and the two eventually plot to kidnap Joo-man and Jin-nyeo.

In-ho, a successful businessman at a young age, seems to be good to his wife, Mi-yeong, but in reality, he is having an affair by sponsoring 20-year-old Soo-ji. One day, when Mi-yeong visits her parents' house, In-ho takes advantage of it and calls Soo-ji to invite her to his house. However, Mi-yeong suddenly returns home and is deeply hurt when she sees the two sleeping in the same bed. By the time she decides to divorce her husband despite his affair, she accidentally gets close to Min-woo, Soo-ji's boyfriend.

Actress hunting – In an alleyway in Gangnam, Seoul, a passer-by tells a lady that he likes her style and asks her if she would like to try out as an actress. He insists that the woman, who hesitates at his word pornography, go to his office, saying that he will pay a lot for her appearance. Fascinated by his performance fee, she follows the man into his office thinking that she must make ends meet. Actress Selfie – A couple is having sex. In the car after sex, the man takes a camera and takes a selfie with the woman. After playing in the stream near the pension, they enter the pension and have sex again. Sex Reveal – An older woman and a younger man couple comes out of the subway. The man takes a camera and starts taking selfies. After returning home, the man installs a camera on one side and tries to film him having sex with an older woman. The man takes a picture of himself in various positions.