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You have my boyfriend! The exchange sex of naughty sisters who are attracted to each other's lovers rather than their current boyfriends.

Two men who love one woman. Every time, Seo-yeon chooses to have a relationship between two men every time. Jin-woo and Dong-hyeon compete while waiting on Seo-yeon. She doesn't think the relationship is strange. In fact, there is a reason for making unwanted choices between the two... who will be the last man who will win Seo-yeon's love. The never-ending love story of young men and woman is just beginning.

Jun-ho and Min-soo, experience a hard time because of Da-hee who drinks whenever she breaks up with her boyfriend, but they still take care of her. But they heard that Da-hee is meeting her ex-boyfriend again. Actually, the two guys like Da-hee. They’re trying to make sure that Da-hee won't meet her boyfriend again. The love story between the two men, which is invisible to the eye, is just about to happen.

Three childhood friends finally gathered. From the first meeting, it's not so bad. Na-yeong enters the house, angry at Min-hyeok and Jin-woo who broke their promise. After living apart for several years, they lived in one house. Three people who are childhood friends but not ordinary friends. When one person disappears, the secret between the two is revealed... Who can develop from a friend to a lover... The unknown story begins now.

Ye-sung and Seok-hun are senior juniors who have nothing to do. One day, Ye-seong, who found an app that relieves women's discomfort, met Seo Hye-ji through a chat app and had a chance to see her. I ask you… Yeseong tells Seokhoon about the chat app as well as signing up for Seokhoon's housework. .Seokhundo app will meet with women to have fun sex. After that, Seokhoon meets women through the chat app while working hard. As more and more Seokhoon than Yeseong is becoming more popular with women in the chat app, women are looking for Seokhun rather than Yeseong, and Yeseong is surprised by the popularity of Seokhun and is driven out of the house.

Sung-chan and Soo-jin used to date. Soo-jin was expecting quality time together until he comes home drunk. A few years later, they break up and Soo-jin appears in front of Sung-chan who is about to marry Yoo-ri. Sung-chan and Soo-jin still like each other and they both desire each other. Will Sung-chan be happily married?

Thyssen, as well as a friend, is an "older sister" of two women, Su Min and So Ra, both decide to work first, as a result, do not have time for long - lasting relationships, which causes many sexual adventures and always that can meet - If to tell this adventures. So far, a man as one of the three interested, this would be the "ideal home" from then on each by itself ...

Jung Tae is living with his girlfriend Young Ji. His friend Min Ho ends up living with Jung Tae and despite the fact that Young Ji doesn't like this situation, Min Ho who is shameless soon gets used to living together. Then one day, another woman appears at home, Jung Tae's former lover and younger step-sister In Hye. Her appearance leaves Jung Tae in great confusion, followed by a sex scandal between four feisty men and women.

Hye Jin, Hee Kyung, and Han Hee who are among the high school alumni. They met at the alumni meeting and heard that the male alumni who did not have a chance to study during their school days were greatly successful as an investment company. And after seeing the settlement a few days later, I am happy to share my memories, but in fact, their purpose (?) Is separate. They are difficult to afford, and they want to get help from Zhengzhou. Since then, Zhengzhou has been enjoying the love of female alumni.

Due to a sudden appointment, Do-joon asks So-jin to go to Joon-ha's house to finish a delivery. Joon-ha was about to get angry because the delivery was late, but when he sees So-jin, he falls in love with her at first sight.

Ryosuke, Minami, and Shoko, who grew up as childhood friends, are a good friend of three who live together even after graduating from high school. One day, Minami, who was originally Obasan's face, went to study abroad when Ryosuke confessed to Shoko. However, Minami, who suddenly disappeared, returned to the front of them two years later. However, the appearance of Minami who reunited was a beautiful gal like another person by plastic surgery. Furthermore, the south that came back is actually a ghost ...

Seok-yeong has been living with his father ever since his parents got divorced when he was young. His father, Joong-nam, would always introduce his new girlfriends to Seok-yeong, but Seok-yeong didn't like running into strangers in his house. At the same time, Seok-yeong feels more comfortable with women older than him. One day, Joong-nam says he's going to marry his new girlfriend, Gyeo-won. At a family dinner, Seok-yeong feels attracted to Gyeo-won's sister, Gyeo-woon, but he has to call her 'aunt'

When the man ejaculates before the woman cums, the sex begins all over again and the same goes for when he ejaculates on time and the sex repeats. His techniques get better, but he can't help but ejaculate prematurely and everything is back to square one... endless sex. The man has sex with two women everyday and is trapped in a loophole of sex. He doesn't have a choice. The man can only get out of it if he doesn't ejaculate. However, he feels horny again almost right away and he ejaculates too soon, once again... He has to get out!

Dae-goo likes his sunbae Soo-kyeong, but she doesn't like him back. One day he discovers 3-Minute Partners and passionately has Soo-kyeong as his partner. As he changes, will he be able to succeed in winning Soo-kyeong's love?

Do-yeong is unemployed after graduating college of physical education but gets a job as a trainer in the gym. There, he meets Se-hee, a beautiful and famous sports caster who lives in his neighborhood. He tries to buy her attention but fails several times. Meanwhile, Do-yeong finds out that the gym is planning a way to use Se-hee and he sets out to save her. What is going on during the 1:1 sessions at the gym and what is the plot behind it?

Chi Soo is struggling to survive medical school life due to his family situation. In his school days, Chi Soo lived in his old friend Song Eun Cheol's house, but naturally became close to Song Eun Soo, Eun Chul's younger sister, and they got married. However, love too is brief... In his second year of marriage Chi Soo experiences a period of ennui, and meets Monica Jeong (Jeong Soo Hee). Monica Jeong impersonated herself as an international lawyer in the United States and came to Korea, and introduced herself as the only child of a wealthy family.

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Jeong-mi, a pickpocket ex-convict, ends up pickpocketing again to repay Dae-sik off of her father's debt. One day, Hae-joo, who is secretly meeting a detective, has been kidnapped and turned into Dae-sik's prey. The detective then went on a search to find Hae-joo's whereabouts.