Hanako gets excited when she sees her college student's son's friend, Jun, and seduces him with her lewd underwear. Surprised, Jun is worried that Kazuya will see this, and pushes Hanako away, but is at a loss for what she can do with her daring temptation. Even after Kazuya…
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Before he goes back to school, Sang-woo moves in with his aunt who gets divorced from his uncle who she's been having problems with for her carefree ways. One day, Sang-woo comes across an adult broadcasting application called Bong-al TV and sees his aunt under the name 'BJ Aunt'. She's covered her face with a mask but he's sure it's her. Sang-woo feels horny at the sight of her and wonders if he's a pervert.
Soo-jin and Jeong-hee are university students who start looking for a high paying part time job during vacation. They end up in a room salon and fall for a high down payment. The owner notices how naive they are and tells them they have to go for second rounds if they want to make big money. Meanwhile, the ace host girl, Yoon-jeong, comes back after a hiatus due to being sick. These girls begin an ego battle for getting the most customers.
Gong-soo works in an underwear company and has a crush on one of the new designers named Soo-yeon. Gong-soo is preparing a design PT for a major company when he decides to tell Soo-yeon how he feels about her. He looks for a chance to tell her but Chief Lee, a handsome and talented man gets in the way.
Sujin, who opened the guest house, will be introduced to Alba Saint Deokho and will start operating as a full-scale accommodation facility. As a first guest, a secret celebrity manager couple came in and the purpose of this couple's trip was parting. The woman leaves and the man stays in the house, beginning the second act as an employee. Meanwhile, a lesbian couple comes in as the second guest, but the men do not let them go but plan and execute somehow to flirt. Meanwhile, as a third guest, a freshman from a nearby university enters the boarding house, and a muscular male student, a senior of a college student, starts living together in this house. The hostess, starving for sexual desire, sees the male body's nasty body and can't stand it and stops him.
The section heads of a planning office Ji Hyeon-woo and Jang Myeong-soo get told by Director Han that one of them will have to leave the office if they fail to get promoted. Rumor starts to spread that Jang will lobby Han into his promotion by using his weakness of women. Hyeon-woo is anxious. He tries hard to appeal to Han but doesn't really cause much influence so he calls up his ex-girlfriend Ji-hyeon. He calls Han to his house and introduces him to her. Han is completely head over heels for the sexy and seductive Ji-hyeon. Meanwhile, Hyeon-woo's wife is upset because he blamed her for not getting his promotion, so she goes to 'talk to' Han herself...
Ji-seok, who raised her daughter Yoon-jeong by herself has had troubles that she cannot talk about. He's just looking to tell his daughter that he has a woman to marry. Since the bride-to-be Soo-jin is of the same age as her daughter, Yoon-jeong is afraid of opposition and cannot speak. Ji-seok finally asks for help from his daughter's boyfriend, Seok-joo, who came to play at home...
Local college couple Won-young and Jun-seok have a long time to graduate, but the two who Jun-seok already got a job and had nothing to do until graduation graduated from vacation and lived in Tokyo. Let's go to the house of a close senior couple, Ari and Sungho. One day before they came, Ari and Seong-ho fought out loud. I greet you welcomingly, but I feel a cold atmosphere for some reason. Seong-ho tells Jun-suk about the couple's fight the other day, and after having sex that night, Jor explains to the young couple the situation of Seong-ho's husband and procrastinates to do it next time. In the end, Won-young can't tolerate her sexual desires and goes to Seong-ho to tempt her. What will happen to the love of the two couples?
Two men love one woman. Seo-yeon chooses who to have a relationship with, every time. Jin-woo and Dong-hyeon competes with Seo-yeon's attention, but she doesn't think the setup is strange. Actually, there is a reason why she doesn't want to choose between the two. Who will win Seo-yeon's love in the end? The unending love story between the three is just beginning.
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.
