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Soo-hyeon and Hye-ji are sitting on a pile of debt thanks to their husband and father who ran away in the middle of the night. Tae-san the loan shark demands the money no matter what. He rapes the mother and daughter and requires them to join prostitution. They survive day by day selling themselves until one day, Tae-san suggests a way they can clean slate over one night and that is for the mother and daughter to have the most extreme sex with one man.

In an ordinary-looking house, live the owner couple, Se-kyung and Jung-sik, their daughter,Ma-ri, and Jin-seong who's new to society. The couple is on vacation, and Ma-ri and Jin-seong are alone in the house. One ordinary day, An Uninvited Guest called Soo-jeong comes along. She had a fight with her husband and had come to stay in her brother's house for a few days. However, one night Soo-jeong gets drunk and mistakes Jin-seong's room for hers. As a result, they end up sleeping together. Ma-ri sees Soo-jeong come out of Jin-seong's room, but suspects nothing else. Vegetarian Jin-seong craves sex and sleeps with Soo-jeong once again. However, Soo-jeong goes back to her husband, and Jin-seong can't help but feel lonely. Meanwhile, Ma-ri likes Jin-seong and seduces him to have sex with her, but she's outraged when he tells her he had sex with her aunt. This is the story of the ordinary but not so ordinary, secretive house.

Mixed-up model and bar hostess Kotoko sleeps with her coworker Genki, but can't seem to let herself sleep with the guy she really likes.

What do we do at an MT? Min-hee and Min-soo used to date. Dong-hyeon and Ah-yeong drink with them the night before they go for the MT. Min-soo puts Min-hee to bed in a motel and Ah-yeong who had the hots for Min-soo, seduces him. They promise to keep it a secret but Min-hee finds out what they have been doing. However, Ah-yeong is a provocative one and decides to seduce Min-soo at the pension where all four of them are together...

Sang-ho, a student who is not interested in studying and wants to take over his father's company and live comfortably, starts tutoring because of his father's anger. Sang-ho, who had little expectations, gradually falls into the secret class of his sexy tutor Hyeon-jeong. And a few days later, a younger, sexier tutor appears...

Jeong-goo is in a relationship with his son's girlfriend, Mi-hee. Mi-hee feels guilty and breaks up with Yeong-jin, and Yeong-jin who is struggling because of it, got in a relationship with Joo-eun. Yeong-jin's ex-wife, Yeon-ri meets Jeong-goo by chance and finds out about the whole thing, and Yeon-ri who was curious about Jeong-goo, sleeps with him...

Jae-min moves into the rooftop across from school but is disappoointed that all the windows have been blocked by other buildings. However, he learns that every night he can see the neighboring women from the other building! Something exciting goes on one night in that rooftop which has the greatest 'view' ever!

Yong-hwa (Sang-woo), Marshall (Lee Eun-mi-I), Ddeok-bae (Do Mo-se) and Bang-wool (Park Joo-bin) steal from Chairman Kang and hide out in a pension in the country. They depend on each other and enjoy every day until Ddeok-bae accidentally loses their bag of money and Bang-wool falls ill. Chairman Kang is closing in on them and the four of them use their specific 'techniques' to start a 12 hour adult program. Will they succeed?

Yonggyu and Taejun, who shoot an experimental documentary about the effects of sex on dieting, once a day with one woman! Twice a day with two women in the second week! And 3 times a day !!! No nationality, no marriage, no past?! The experiment of three weeks' reckless experiment with 6 experimental participants is unfolded. What is the end of this imaginative project?

Ji-won is an erotic writer, but she has not had sex yet, so she cannot write realistically. Eun-sik and Seong-gook compete for their first sex under the pretext that Ji-won is a virgin for her work, and Seong-gook's plan goes up in smoke when his wife Hyeon-hee returns home. On the other hand, Hyeon-hee is curious about Eun-sik and approaches him because his previous job is adult learning and mastering. In this situation, will Ji-won be able to finish her first sex safely and write a huge masterpiece?

Ji-soo and Joon-yeong have been married for 5 years. Unlike the first few years of marriage, Joon-yeong is terrified at the sound of Ji-soo taking a shower. However, Ji-soo advances on Joon-yeong more and more because she wants to have children. Meanwhile, Ji-soo's best friend Yoon-kyeong comes back from the Philippines and spends a few days with the couple. Joon-yeong feels his manhood reacting when he see's the young-looking and sexy friend of his wife's...