Seok-yeong has been living with his father ever since his parents got divorced when he was young. His father, Joong-nam, would always introduce his new girlfriends to Seok-yeong, but Seok-yeong didn't like running into strangers in his house. At the same time, Seok-yeong feels more comfortable with women older than him. One day, Joong-nam says he's going to marry his new girlfriend, Gyeo-won. At a family dinner, Seok-yeong feels attracted to Gyeo-won's sister, Gyeo-woon, but he has to call her 'aunt'

Woo-hyeon finally passes his college entrance exams and lives with his aunt, Mi-yeon, nearby. He sees her for the first time since he was young. She's not his real aunt, but she's younger than he thought. Then one night, Woo-hyeon peeks at Mi-yeon, who is pleasing herself. So begins the dangerous relationship...

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.

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.

Cheng, a beautiful martial arts ace, battles to keep her inheritance from the ruthless Yun Wei, but her efforts are sabotaged by Yu Tao, her wayward and irrepressible great-nephew. Following a frenzy of spectacular comic mishaps, the hapless duo are setup and imprisoned and the deeds to Cheng's estate are stolen. She is held hostage after a doomed attempt to reclaim the papers back from Yu Wei's place, and the stage is set for a savage fight to the death.