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Myeong-hoon usually likes to go to massage shops, where he can even have sex with the masseuse. Then one day, her younger brother introduced him to the woman he would marry, and the woman who would become his sister-in-law was the masseuse he met recently at a massage shop! Myeong-hoon makes a secret proposal to the embarrassed woman, and she accepts it for the sake of her smooth married life, and their dangerous relationship begins.
A female college student is masturbating by imagining many things while watching a movie: imagining sex between a sister-in-law and her brother-in-law, imagining sex between a daughter-in-law and her father-in-law, etc. While she was masturbating, she moaned loudly and was caught by her stepbrother. The woman's body gets hot and cannot hold it, so she seduces her stepbrother.
Yeong-tak and Ha-na are stepsiblings who live with the support of their divorced adoptive parents. The two begin taking individual private lessons for their respective careers. Yeong-tak secretly gives his acting teacher Na-ri sleeping pills to covet her body, while Ha-na is busy seducing her physical education teacher Han-cheol. Meanwhile, Na-ri and Han-cheol run into each other at the stepsiblings' house, fall in love at first sight, and seek revenge on the two who offended them.
Yoon-yool and Min-seong go out to a company dinner with their bosses, Yeon-joo and Han-yeong. Min-seong had to carry Yoon-yool, who is passed out due to alcohol, on the way to her home. When Yoon-yool wakes up to take a shower, she is surprised to see Min-seong inside her room. Min-seong became excited when he saw Yoon-yool wearing only a towel and couldn't hold on to the temptation to lust for her body.
Jang-hyeok, a man Yoo-jin has a crush on, meets her at his mother's request, but he hates Yoo-jin. Yoo-jin knows that Jang-hyeok doesn't like her, so she asks her best friend, Si-nae, to meet Jang-hyeok. Si-nae and Jang-hyeok fall for each other and get married. However, Si-nae, who likes alcohol and men, enjoys an extramarital affair with Sang-min. On the other hand, Yoo-jin becomes unrecognizably pretty, and Jang-hyeok falls in love with her.
Joo Seung-gi and Yoo Ah-rin desperately have sex several times a day to have children, but they were not pregnant, so they were tested, and the result of the test was Seung-gi's infertility. After much consideration, Seung-gi asks his fiery friend Yoon-woo to have a relationship with Ah-rin, and after persistent persuasion, Ah-rin and Yoon-woo have a relationship. Afterwards, Seung-gi began to doubt the relationship between Yoon-woo and Ah-rin...
Managers Im Yoo-na and Kang Ji-won looked like an in-house couple. However, Yoo-na will actually marry team leader Byeong-seok who has a heart for her. Even after marriage, Yoo-na can't seem to forget Ji-won. Byeong-seok thinks that he's having a stable marital relationship with Yoo-na, but he can't relate to her feelings. He deliberately invites Ji-won to his home. Byeong-seok's obsession gets worse, and the three hide their true feelings for each other, and the relationship becomes strange.
Kim Hak-cheol is a trashy husband who sends his wife Jin Joo-hee to his friend Kang Min-hyeok as a housekeeper due to gambling debts. He visits his wife once in a while and steals money. He borrows money from Min-hyeok, a golden spooner who is Hak-cheol's friend, on the condition that Joo-hee is sent as a housekeeper. Min-hyeok is kind to his friend's wife, Joo-hee. Over time, the true colors begin to emerge. Meanwhile, Min-hyeok's wife, Nam Gyoo-ri, lives together with them without knowing anything about Joo-hee.
A young gentleman feels sorry for his younger brother and his wife who try to have children every day. His sister-in-law had a heart for him who is more caring to her, than her husband who usually treats her harshly, and when the young man found out about this, he hurriedly leaves his seat. The younger brother gets tired of his wife, who can't have children, and he meets another lover, and he's happy to hear that she's pregnant.
Kyeong Hwan, who is home alone with the daughter-in-law who came from the countryside, falls in love.
Jeong-goo is in a relationship with his son's girlfriend, Mi-hee. Mi-hee feels guilty and breaks up with Yeong-jin, and Yeong-jin who is struggling because of it, got in a relationship with Joo-eun. Yeong-jin's ex-wife, Yeon-ri meets Jeong-goo by chance and finds out about the whole thing, and Yeon-ri who was curious about Jeong-goo, sleeps with him...
Welcome! Come inside to the unmanned AI Hotel! Min-goo and Soo-ji entered an unmanned hotel located in an attractive location. AI that is more human than humans greet them and received fantastic services from the all-rounder male AI, 69, and innocent but sexy female AI, G10. What services do they offer in this unmanned hotel?
Kyeong-hwan, who stayed home alone with his daughter-in-law from the countryside, comforted each other.
Chae-hee, who pursues a free lifestyle, is asked to live as her mother only once by Se-yeon, who lived in her house one day. Jong-wook who was brought by Se-yeon, thinks that Chae-hee is her mother-in-law and tries his best to score.
One day, Na-na's regular customer, Cheol-woo came to the massage room. Cheol-woo, after taking Viagra, is not satisfied with Na-na alone, and begins a special service with Bo-mi and Mi-na inside the room.
Hwa-in, a beautiful woman who ran a lighting shop at a young age, woke up in the forest. She lost all her memories in an instant... and while being hit by the rain, as if drawn by her instinct, she enters a luxury mansion. One woman and two men greet her. She beings to feel fear from the man who sneaks and peeps at her as if she's being stalked.