하숙생 : 위험한 동거

Campus couple Tae-ho and Eun-seo join the same graudate school to sit in lectures for the most powerful person in Korean journalism, Lee Hee-hyun. On the first day of school, Lee Hee-hyun takes a liking to pretty and smart Eun-seo and uses his authority to try and seduce her, but fails. Hye-jin realizes what the professor is trying to do and spends a night with him, getting herself to the syposium. Eun-seo questions the result and asks Lee Hee-hyun for an explanation. He asks her for physical pleasure and Eun-seo is just confused...

Ji-soo and Joon-yeong have been married for 5 years. Unlike the first few years of marriage, Joon-yeong is terrified at the sound of Ji-soo taking a shower. However, Ji-soo advances on Joon-yeong more and more because she wants to have children. Meanwhile, Ji-soo's best friend Yoon-kyeong comes back from the Philippines and spends a few days with the couple. Joon-yeong feels his manhood reacting when he see's the young-looking and sexy friend of his wife's...

Joon-ha had the best night of his life with an older woman he met while drinking. He starts looking for her as he can't forget the feeling and finally they meet. However, she's going to become his new stepmom. She's his father's girlfriend. When the three start living together, things turn edgy and then dangerous when his father leaves the house one day.

Dong-gook, who is thinking of remarrying, introduces his stepmother Kyeong-sook to his son Jin-yeong. At the family gathering, Jin-yeong is surprised to see his stepmother's younger brother Hyeon-sook who was his one-night stand just a few days ago! Jin-yeong and his stepmother is lying down, drunk. Meanwhile, there is a strange atmosphere between Dong-gook and Hyeon-sook, who were drinking alone, and at that moment Jin-yeong's girlfriend Joo-yeon appears drunk.

Hyeon-soo's younger brother Kang-tae visits the house of Hyeon-soo and Min-jeong, who are enjoying their honeymoon. Min-jeong is in favor of a kind Kang-tae. Kang-tae consults his junior, Na-hee, that he seems to like his sister-in-law. Na-hee says to get over himself, but Kang-tae actively seduces Min-jeong...

Woo-seong is an interpreter who sleeps with his girlfriend to relieve stress. One day a work call brings him face-to-face with a woman from his past, which tempts him beyond self-control.

In-ho, a successful businessman at a young age, seems to be good to his wife, Mi-yeong, but in reality, he is having an affair by sponsoring 20-year-old Soo-ji. One day, when Mi-yeong visits her parents' house, In-ho takes advantage of it and calls Soo-ji to invite her to his house. However, Mi-yeong suddenly returns home and is deeply hurt when she sees the two sleeping in the same bed. By the time she decides to divorce her husband despite his affair, she accidentally gets close to Min-woo, Soo-ji's boyfriend.

Jeong-woo, who was enjoying his honeymoon with Na-yeong, quietly calls Min-joo while she is on a business trip. And after having a lovely time alone, he was resting at home, and Na-yeong came home earlier than he thought, and Jeong-woo hurriedly sent Min-joo away, but Min-joo is hiding in Jeong-woo's house instead of going back to her house. At this time, when Na-yeong and Jeong-woo peeked at the scene, they were so surprised that they ended their relationship with Na-yeong in a hurry and drove Min-joo away. But the immature girl, Min-joo, who is enjoying this, how will their relationship end? The thrilling love story between a young man and a woman is just beginning.

Yeong-hoon realizes that he is strangely drawn to Mi-ran, a married woman, who is one of his colleagues at work and adored by many men. Yeong-hoon keeps flirting with her constantly and he finally ends up having a passionate sex with Mi-ran. He becomes deeply drowned into her allure. One day, Yeong-hoon receives a shocking video message when he visits Mi-ran’s house. The video informs him that Mi-ran’s couple has been using Yeong-hoon as their sex partner. Mi-ran’s husband, Jeong-wook invites him to join their games. Yeong-hoon cannot decide between his loving emotion for Mi-ran and his desire. Yeong-hoon after all tells the husband to let her go, because he is in love with Mi-ran. Jeong-wook accepts his request under one condition, which is that Yeong-hoon should have sex with Mi-ran in front of Jeong-wook. Yeong-hoon accepts the suggestion and starts having sex with Mi-ran in front of Jeong-wook, but he stops in the middle.

Kang-se is released from prison and comes back home in 6 years to find out his father who lived alone was killed by a woman named Ok-ryeon.