Joon-yeon and So-hyeon are living together with Joon-yeon's young and pretty mother-in-law for a while after his father-in-law remarries. One day, Joon-yeon is left home alone with his mother-in-law due to So-hyeon and her father-in-law's sudden business trip. The mother-in-law seduces her handsome son-in-law on a hot night. Unable to forget the sex he had with his mother-in-law, Joon-yeon even plans to have a threesome with his wife and his mother-in-law.
A female college student upstairs who likes big things! Instead of her boyfriend, she became more addicted to sex with the owner downstairs.
BJ Meok-ja, a male BJ who broadcasts for adults, plans to win a big share by joining forces with Ji-hye, a married woman. However, Ji-hye and her husband are making different plans.
You have my boyfriend! The exchange sex of naughty sisters who are attracted to each other's lovers rather than their current boyfriends.
An unemployed man. The man has no money and ends up staying with his married older brother's house. His sister-in-law feels sorry for him seeing only playing at home. A man who always watches his sister-in-law's thoughts and actions. Then one day, he found out that his sister-in-law was having an affair and cheating on his brother!! He threatens his sister-in-law about what he found out, so she asks him to keep it a secret and tells him that she will grant all his brother-in-law's requests.
So-jin, who has been ignored by her friends because she doesn't have a luxury bag, gets a job as a housekeeper at Joon-ha's house to earn money. When Joon-ha found out about the real reason why So-jin started working for him, he made a secret request to her for the equivalent amount of money she needed.
All men who want to have sex with their single mother-in-law or with their ideal type, gather up! A new world will be opened where you can enjoy the sex you want with the person you want. A world where you can fully enjoy things you have never done with your lover. However, there is only a slight difference in cost.
Ji-hee and Tae-oh run away after killing her husband, the boss, in Saipan. In order to survive, the two head to Gwang-tae, the boss of an organization in Pattaya, with whom they have always been hostile. Gwang-tae seems to accept and protect the couple, but Tae-oh decides to evacuate Ji-hee again out of the sight of Gwang-tae, who is like a time bomb. Tae-oh, who promised to run away at night, did not appear, and instead Rachel appeared in front of Ji-hee.
Yeon-hee, who hasn't changed her hair and isn't ready for the first night, gives sex advice to her friend over the phone and calls her boyfriend over to have sex. Unlike the first time, he is overflowing with libido and visits her office to have sex. Ji-ho is worried about her girlfriend. Although they are friends, Chae-ah and Seon-woo end up having sex after drinking during the day. Different sex stories of 4 couples.
Hyeon-goo introduces Seung-mo to the local area, probably feeling sorry for Seung-mo, who lives under his wife's nagging. However, Hyeon-goo's purpose is to divert Seung-mo's attention and meet Seung-mo's wife, So-hee. After spending time with different people, So-hee and Hyeon-goo's feelings change.