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.

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.

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.