Mi-jin and Mi-soo, move out and came to Seoul to find a job. Mi-jin who used to have a boyfriend, happened to know a building owner in Seoul, and the meeting with the landlord begins. However, Mi-soo liked Mi-jin's ex-boyfriend, Ji-hwan, and she thinks it's her chance to seduce Ji-hwan to go out with her. The sisters and ex-boyfriend's secret live-in affair starts.

Joo-yeon and Seok-jun are preparing to remarry. Jung-yeon's daughter, Yoon-jung and Seok-jun's son, Jung-woo, are also in love. Yoon Jung and Jung Woo also promised marriage. Jung-woo falls in love with Yoon Jung's mother. I worry about Yoon Jung and Juyeon. Jeongwoo goes to the main role and confesses, even the affair is done. Seok-joon becomes estranged from Min-jung, the daughter of Joon-on. Joo-yeon and Seok-jun become friends with each other's son and daughter. Naturally postpone marriage.

Yeong-soo saved money for 10 years since he graduated high school and now he's getting ready to go to college, which he has been putting off. Ji-eun is his girlfriend who has been by his side for the last 5 years, but the sex with her is quite boring. It almost feels like a chore. However, he doesn't want to break up with her, as they have been together for a long time. The first mock test comes up, but Yeong-soo has lost his will to go to college and his sexual desires.

Da-hyeon and Hyeon-soo grew up like sisters without their parents, and still live together even after Da-hyeon got married. Sex isn't good between Da-hyeon and her husband, so when her husband is out, she has an affair with a stranger. One day, Hyeon-soo's step-father, Seok-hyeon, goes to his son's house and sees his son's wife's sister there all by herself...

Seol-hwa, an aspiring celebrity, is envious of her younger sister Seol-min, a celebrity on top of her game. Seol-min, however, is not afraid to use her body to not miss any opportunity. Seol sisters' road to stardom begins.

Minjung, the older sister who was the first love of Cheolsu. Chulsoo is drinking with Minjung who was about to get mixed. The two people who drank do the affair in Min-jung's house. After returning home, Chul-soo meets Young-hun, who was close with Min-jung. Young-hoon is dating his favorite Yuri. After seeing Chul-soo for a long time, I am excited to introduce Yuri. However, Yuri, who was not interested in Yeonghoon, feels crushed by her withdrawal. Young-hoon and Chul-soo are second. Young-hun is surprised when he talks about what happened with Min-jung while drinking. Young-hoon goes to Min-jung right away. Yeonghoon also liked Minjung in the past and has been rejected many times. After drinking, he comes to pick up Min-jung. Min-jung feels sorry for the drunk Young-hun, and teaches Young-hun the real love.

Hye-ran, who had tutored at Yeosu and her home, said there was something left behind. At the request of Yeongsu, he will additionally help him study.

Every day, a hot Min-cheol-nahee couple. Na-hee goes home to introduce Min-cheol to her sister Eun-young. After a brief greeting, they immediately go into the room and have hot sex. Eun-young accidentally saw her. From that night, Min-cheol keeps thinking and masturbating. One day, Na-hee leaves the house to meet a friend, and Min-cheol comes to the house. We are going to drink together, and Mincheol wants to soothe her for being lonely without a lover...

Their neighbors, Young-hoon and Chul-soo, have their first love, Minjung. The innocent glass appears to the two men, and each other's love is mixed. As time goes by, Young-hun finds out that her real love is glass and discusses how to reconcile again. Meanwhile, Chulsoo completes his life in the city and descends to his hometown. Then, by chance, Yeonghoon and Yuri appear in the place of reconciliation, and after seeing such withdrawal, Yeonghoon is very embarrassed and asks why he came back. Cheolsu presents something to Younghoon and Cheolsoo and Yeonghoon Yuri go to Minjung's home, the first love of the two men... The story of the two men and women who cannot see one another begins again.

Seong-il and Hyun-jung are a couple. Seong-il loves sex. However, Hyun-Jung is fed up with the sex demands of Seong-il who is too obsessive. Hyun-jung talks with her senior about her husband's complaints. Minwoo, who lives next door, comes outside and accidentally listens. Minwoo, who was usually interested in Hyunjeong, pretends to be a coincidence and helps Hyunjung to throw away the trash. Min-woo, who is favored by Hyun-jung, asks sex partner Yoon Kyung to twist her. Disguised as a gas inspector, Yun Kyung visits Seong-il's house and seduces Seong-il to succeed. After that, Sung-il tries to have sex with Hyun-jung, but Seong-il...