키스학개론

Tae-oh, a self-employed veteran who has no intention of getting married, is unable to resist his younger brother's anger, so he asks to borrow the wife of a friend, Se-yeon, who works in insurance, for one day. Se-yeon agrees, thinking it might be fun, and as she sees Tae-oh living better than she expected, she gradually develops feelings for him.

Yeong-hoon realizes that he is strangely drawn to Mi-ran, a married woman, who is one of his colleagues at work and adored by many men. Yeong-hoon keeps flirting with her constantly and he finally ends up having a passionate sex with Mi-ran. He becomes deeply drowned into her allure. One day, Yeong-hoon receives a shocking video message when he visits Mi-ran’s house. The video informs him that Mi-ran’s couple has been using Yeong-hoon as their sex partner. Mi-ran’s husband, Jeong-wook invites him to join their games. Yeong-hoon cannot decide between his loving emotion for Mi-ran and his desire. Yeong-hoon after all tells the husband to let her go, because he is in love with Mi-ran. Jeong-wook accepts his request under one condition, which is that Yeong-hoon should have sex with Mi-ran in front of Jeong-wook. Yeong-hoon accepts the suggestion and starts having sex with Mi-ran in front of Jeong-wook, but he stops in the middle.

When a poor student can’t pay his bill at a snack bar a mysterious woman pays it for him. She ends up taking a room at the boarding house where he lives. With her lively personality she becomes erotically involved with all the residents living there and helps with their various sexual problems.

Min-sang and Yoo-ra is already married for two years. Min-sang lives with his wife Yoo-ra and her sister Yoo-mi. Min-sang used to live alone because his parents died early, and Yoo-ra lived alone with her younger sister after their parents died in an accident. Because of this mutual understanding, when they were introduced to each other through a dating agency, they became attracted to each other, and they even got married... I'm starting to feel more and more like a woman.

'A sexy and rich' guy who has to go to the military giving up his school credits, 'a loser' who just got discharged dreaming of heated love and 'a goose father' who hasn't had sex in forever, join a paragliding club for other reasons. A hot and sexy girl appears in front of them and the three hyenas convince her to go to an overnight paragliding trip with them. Who will be the winner? This girl playing hard to get causes the three to shake and they start doing anything they need to get her to spend a night with them...

Jeong-hye and Ji-hwan are a couple who have been living a wandering life due to debt. Ji-hwan makes a secret deal with Man-soo, the new owner of their previous house. The couple can stay at Man-soo's house, but in exchange, Ji-hwan must have sex with Man-soo's wife, Tae-hee. Man-soo also ends up taunting Jeong-hye secretly, using her unemployed husband as bait. Later, Jeong-hye and Ji-hwan eventually find out that they have been secretly played by the couple and get frustrated. In the end, Man-soo and Tae-hee propose a new offer to the couple.

Mi-ra, a woman with violent and boyish personality. Jeong-seok, a timid man who finds Mi-ra's violence attractive. Jeong-seok is a visual but his every action and his slouched shoulders make him look really timid. Do opposites really attract? The two people were drawn to each other's different charms. Whenever they're having an intercourse, Mi-ra led everything, and she makes aggressive demands like scribbling on her body or swearing on her. However, the timid man's standard has not changed, and Mi-ra says goodbye to Jeong-seok. He happened to meet Tae-hee by chance. Tae-hee is a hardcore master! She is an instructor who runs a private tutoring center with Seong-ho. Jeong-seok learns the essence of being hardcore from them and begins to straighten his slouched shoulders.

Daughter Soo-hyeon is living a fun life with her mother Eun-mi. Then suddenly, a strange thing happens to mother Eun-mi and daughter Soo-hyeon, whose bodies changed. The two are forced to play the role of mother and daughter. Then, when the mother and the daughter have sex with each other's partners, they try to have more intimate and stimulating sex.

Ji-cheol is a job seeker who only plays and eats, and is the boyfriend of Eun-je who runs a small store. Meanwhile, Joong-hoo, a hikikumori, became a regular after accidentally seeing Eun-je in the store. She is mistaking her kindness for her affection for herself. Joong-hoo started stalking her SNS every day. In the end, after approaching Eun-je with an innocent face, he succeeds in locking up Eun-je. As Eun-je disappears and the money supply is cut off, Ji-cheol is eager to find Eun-je. Ji-cheol, who is sad about money rather than worrying about Eun-je's safety, tries to lure Mi-seon out of her pocket money. Eun-je, who saw the scene of these two people's affair through a hidden camera, disarms Joong-hoo while drinking with him, thinking that she should somehow get out of there. Eun-je eventually escapes. Feeling empty without Eun-je, Joong-hu confines Mi-Seon, who ignored him. Three months later, someone came to Joong-hu's house and then…

Min-ji is sick and tired of her boring housewife life and unhappy marital relationship. Her friend Hye-jeong lives the exact opposite. She envies Hye-jeong like that. Min-ji who is frustrated with her desires, starts to notice Sang-soo, Hye-jeong's husband. Min-ji approaches Sang-soo while Hye-jeong is not at home, and Sang-soo starts to worry about Min-ji. Will the two men and women be able to enjoy the secret meeting without getting caught by their husbands and wives?

Yeon-joo, a fitness trainer-turned-sexy adult actress who has been strengthened by exercise! Her straightforward, bold story and secret sex life, where men are constantly attracted, begin!