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In an ordinary-looking house, live the owner couple, Se-kyung and Jung-sik, their daughter,Ma-ri, and Jin-seong who's new to society. The couple is on vacation, and Ma-ri and Jin-seong are alone in the house. One ordinary day, An Uninvited Guest called Soo-jeong comes along. She had a fight with her husband and had come to stay in her brother's house for a few days. However, one night Soo-jeong gets drunk and mistakes Jin-seong's room for hers. As a result, they end up sleeping together. Ma-ri sees Soo-jeong come out of Jin-seong's room, but suspects nothing else. Vegetarian Jin-seong craves sex and sleeps with Soo-jeong once again. However, Soo-jeong goes back to her husband, and Jin-seong can't help but feel lonely. Meanwhile, Ma-ri likes Jin-seong and seduces him to have sex with her, but she's outraged when he tells her he had sex with her aunt. This is the story of the ordinary but not so ordinary, secretive house.
Tae-gyu and Na-yeon have been dating for a year. She introduces her close junior, Ah-joong to Seo-jun. However, Seo-jun who prefers older ladies meets Na-yeon and had a one night stand... Na-yeon comes to ask Tae-gyu for forgiveness, however Tae-gyu was not home, but his twin, Jae-gyu. Na-yeon who has been dating Tae-gyu never once heard of Jae-gyu, and thought he has been lying from anger. However, after seeing the twins' picture, Seo-joon confirms that they were a twin and inevitably believes. Could it be true?
Newlywed couple A-yeong and Kwang-soo is at the edge of a cliff. After five months of opening a small restaurant in his brother's cabin, Kwang-soo who struggles to attract customers even worked part-time at a parking lot to pay back the rent to his brother. After hearing about this, Kwang-choon said he will waive the store rent until the business is stable. Kwang-choon's kindness had a different purpose, he had his eyes on his younger brother's young and pretty wife, A-yeong, for a long time now! Kwang-choon persistently takes advantage of A-yeong's suffering and hardships in life, and is demands her to have a physical relationship. While A-yeong walks a dangerous path between her husband and his brother-in-law's bedroom, Hyo-seong who is suspicious of her husband's affair was astonished by the fact that his partner was his younger sister-in-aw, and decided to have her revenge. Will the two women be able to escape the tangled web of their relationship
Rich Do-won lives off the libido of a sexual plaything girl named Yoo Min-hee. One day, his elder brother, Dae-ho, is kicked out of the company after his brother's business went bankrupt and he was raising money here and there. Dae-ho visits his wife Seong-ah and borrows money from Do-won. But he can't even pay back the interest and ends up being a fugitive, and Do-won takes advantage of this opportunity to approach Dae-ho's wife. After such a hard time, Dae-ho and Seong-ah run away. However, Dae-ho dies after being caught by Do-won, who was waiting in advance, and takes the baby home alone. As time goes by, Seong-ah's body heats up and wants an active relationship, and then Do-won's unconventional demands increase. And then one day, her husband who she thought was dead, came to see her.
Eun-ji and Shin-ae are lesbian lovers. However, Eun-ji is forced to marry Jae-seong due to her parents' torches. Due to Jae-seong's severe paranoia, he suspected his wife Eun-ji, who is unhappy with their marriage, of her relationship with Ho-jeong, Shin-ae's senior, who lived next door. With the help of Shin-ae, Eun-ji divorces Jae-seong, and Shin-ae approaches him for Eun-ji's revenge.
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.
Seon-woo and Eun-gyeol, two old friends who grew up together since their snoring days, live together with their wives even after marriage. As time goes by, the two begin to lose interest in their relationships with their wives, Ga-hee and Jeong-eun, and decide to try swapping. After swapping, Seon-woo and Eun-gyeol's friendship begins to crack, and they start to covet each other's wives at will. In the end, Ga-hee and Jeong-eun leave their husbands.
A husband named Cha Dae-seong turns into a vegetable after an accident. Yoo Soo-yeon, his wife, takes care of him with all her heart. One day, she meets Baek Goon while hiking on her own. As time passes, Soo-yeon starts leaning towards him... Baek Goon and Soo-yeon have an affair and she even boldly has sex in the room her stationary husband is lying in. The husband cries in his heart as he can't do anything about it. Baek Goon's sex partner, Hee-jin suspects something is going on and follows him to find out everything. Then she starts taking care of Soo-yeon's husband. Dae-seong starts getting better and slowly starts to stir... However, he still pretends to be a vegetable and watches his wife and slowly, he starts getting revenge on his wife and Baek Goon.
Ha-ni who was on a honeymoon with her husband, Jae-ho, seems to be uncomfortable with her sister-in-law, Ye-ji. She is a freeloader who lives in her brother's house without any other job. When the close brother and sister's affection was being expressed boldly and the sister's obsession with her brother gets stronger day by day, Ha-ni got tired of her sister-in-law's behavior of entering their bedroom in her sexy underwear. Ha-ni goes to Ik-tae, the manager of the cabin and had a physical relationship. What could the real purpose of their trip to the mountain be, and what could be the fate of the married couple that is tangled like a thread around Ha-ni and her sister-in-law's relationship?
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.