Nineteen-year-old, Jin-goo enjoys an erotic moment to himself while thinking about his pretty English tutor. Then one day, he is caught in the middle of an embarrassing moment and becomes awkward with her. However, this becomes an opportunity and she starts teaching him sex. Their replationship becomes an uncontrollable romance. However, she quits the tutoring and the relationship to get married. Time goes on and Jin-goo is a grown up. He's used to thoughtless sex. However, his partner of benefit gets pregnant so he meets his future-mother-in-law to talk about marriage. However, she's so beautiful and sexy. He moves in with the in-laws but soon breaks out of the marrige due to his wife's fling. The mother-in-law doesn't know how to make it up to him for what her daughter has done. Jin-goo suggests something dangerous...

After her mother dies, Young-jae visits her older sister's house, who took care of herself like her, and reunites with her sister, Soon-ae. She is incredibly greedy and charming. With the provocation of Soon-ae, the two develop into a secret relationship. One day when she was having a hot night with her mature lead, her daughter got stuck between the two ... A young and sexy daughter, a seasoned and mature mother, and a man wandering between mother and daughter. An unprecedented triangular romance between the three begins.

Ji-suk, a wealthy mother, wants to send her son, Se-hyuk, to the medical school. While looking for a competent private education coordination, Although it succeeded in recruiting a high-ranking entrance exam coordinator,'Starring', which only a few elite students selected. After hearing the rumors,'Namjae,' the father of Euntae, a high school examinee next door, hears rumors and comes to contact the main character. Like this, the parents of Se-hyeok and Eun-tae's neighbors 'Starring', who was in a difficult situation after entering a strange competition Eventually, I would share the day of the week to go to both houses to teach Se-hyuk and Eun-tae. Although they will agree with the two families, Eun Tae, who is a senior high school student, is in medical school. Not interested and only busy with high school girlfriends Se-hyuk starts talking to a beautiful tutor, starring than the entrance exam.

Won-jin is sent into a nearby region suddenly by the company. He is unprepared when he goes down so he calls his friend Chang-hoon who lives there. Chang-hoon lets Won-jin stay at his house for the time being but Won-jin gets to thinking. The reason is, Chang-hoon's young wife Soo-yeong has a history with Won-jin. However, Won-jin decides to go to Chang-hoon's house to see Soo-yeong. Chang-hoon just happens to leave the house for a while and Won-jin meets Soo-yeong's glamorous friend Kyeong-hee who is also living there. Won-jin starts living with Soo-yeong and Kyeong-hee who starts seducing him.

Ong-nye had a world of men wrapped around her finger, until, one day, a horrific injury leaves her handicapped, and she retreats to the mountains. But one man may break her loneliness.

A man's business fails and he's chased by loan sharks. He moves in with his best friend. His best friend's wife can't conceive, so the man sleeps with his wife to help her conceive.

Jung-hoon manages to get into a university in the outskirst of the city after years of trying, but he can't find a place to stay so he stays at his aunt's house. Ji-hyun runs a shopping mall with her friend Eun-young. Jung-hoon arrives at Ji-hyun's house with just an address and runs into Eun-young who happens to be completely naked.

Tae-hee, can't live without her dead husband, and is living alone without being remarried. Her neighborhood friends, Yeong-ju and Cheol-min still feels sorry for her. However, Yeong-ju's son, Min-ho, secretly takes pictures of Tae-hee, admiring her. One day, Tae-hee and Yeong-ju goes to the grocery when she heads back home, after forgetting her cellphone in Yeong-ju's house. Just in time, Min-ho comes out of the shower and hugs Tae-hee...

Eun-joo dreams of being a plastic surgery specialist while she works as a nurse. At night, she has a job as Nabi, having sex on the phone to come up with money for her dad's medical bills. La Belle's madam Big Mama pays her girls in advance and forces them to do sexual activities like body cams while she rips them off their money. At La Belle are Candy, Cherry, Eunmi and other girls with stories but have sex on the phone with men. Meanwhile, Joon-ho, Eun-joo's hospital director starts showing interest in Eun-joo who looks like his dead wife and they develop a romantic relationship. However, Eun-joo doesn't open up to him so he starts to feel disappointed. Joon-ho starts getting obssessed with her the more she pushes away from him until one day he sees her going to her night job.

Junho and Jungkook are friends. They each live with their mother. One day, Jun-ho goes to his friend's home to meet Jung-kook's mother Mi-jeong. However, she falls in love at first sight with her younger and more beautiful figure. Mi-ho, who has lived alone without her husband, falls in love with Junho. Meanwhile, Jungkook is going to have a wild conversation with Junho's stepmom Yujeong whom he met with a chat application and feel her actually...

Mi-seon loves her family, but she loves having sex with younger men. One day, she hears her sex partner, Jeong-woo, has a brother and she feels more attracted to the younger man. Mi-seon goes to Jeong-woo's house and tries to seduce his brother when he's alone. However, her new sex partner is her daughter's boyfriend.

My sister and I moved into a new house. We didn't do much but the woman downstairs came up to ask us to keep it down. She said she was sensitive so we decided to keep it down. Her gangster husband would beat her when he came home drunk. Every time I heard her suffer from the beatings, I couldn't stand it and would stomp the floor to create a distraction. She would come up telling us to be quiet. I told her I did it intentionally. I also decided to do something about the woman who showed interest in me by memorizing my number.

Couple Jin-goo and Joo-hee have been experiencing a lover's slump after their marriage. Meanwhile, a new couple in the neighborhood, Hyun-jin and Yoo-jeong came to the other couple's house to introduce themselves. They're attracted with each other's husbands and wives, and in the end, crosses the line that is not supposed to be crossed within neighbors. After that day, two couples' passion intensifies...