Se-hee is doing home training. Ji-eun, her roommate, introduces her to her boyfriend's best friend, Kang-hyeon, as her home trainer.

Hee-jeong and his male colleague were locked up when the door is locked while they cleaning and organizing a warehouse. While they are still trapped, the male employee filmed her physiological phenomenon, and later used it as blackmail for him to covets Hee-jeong's body. He even demands 2-on-2 swapping with their other female colleague.

High school classmates So-ra and Ha-neul go to a pension with their boyfriends Sang-woo and Si-hoo. On the first night at the pension, So-ra's drunk boyfriend Sang-woo enters the wrong room and ends up having sex with Ha-neul. Meanwhile, So-ra, who fell asleep first, wakes up, looks for Sang-woo, and hears the sound of the two having sex. Losing her temper in her revenge, So-ra seduces Ha-neul's boyfriend Si-hoo, who is also drunk and asleep in living room, and has sex with him as well.

Sisters Ji-soo and Ji-yeong decided to sell their used underwear due to financial difficulties. Perverted men offer to buy them at a higher price by asking these two sisters for shots of them wearing the underwear. Other men offer to pay even higher prices by demanding sex out of greater desire. As the sisters earn more money than expected, their service becomes more and more popular.

Heojin, who wants to swap, takes her husband, Wonjae, and goes to a pension with Nari and Taeho. Two couples swapping partners and enjoying swapping. Her husband Tae-ho, who was passive at first, rather enjoyed her after seeing him, but her heart is upset.

Hee-soo goes to her ‘rich lover Seok-ho’ while her husbands is on a business trip. Her younger brother Hee-yeong and her husband Jeong-tae are also together. Hee-soo introduces Seok-heo to Hee-yeong and Jeong-tae, and Seok-ho falls in love with Hee-yeoung at first sight. As Seok-ho tries to avoid Hee-soo’s eyes, and meet with Hee-yeong’s eyes instead, he decides to take advantage of Jeong-tae. Jeong-tae who dreamed of having sex with Hee-soo, seduces her, and while Hee-soo and Jeong-tae were playing, Seok-ho wins and took Hee-yeong as price. These people who are complicatedly intertwined, are at a crossroads to choose whether to disperse or become a new family.

Unlike Seok-ho, who is happy to meet you, Jeong-hun is uneasy about Su-jin's wife, Sujin. This is because he liked Sujin in the past but couldn't confess because of his seniors. A few days later, Jeong-hun and Su-jin visited the house at the invitation of a senior and reunited after a long absence. They talk alone to confirm their feelings for each other and to share their hot love affairs...

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An erotic film about a husband and a wife who end up swapping partners because of their respective sexual desires.

Newlyweds, Sejin, have erectile dysfunction, and the man next door is an employee of a pharmaceutical company and is testing a new drug for erectile dysfunction. The side effect is that sexual desire does not stop.