Gwang-ho is bored except for the time he's taking off his girlfriend's underwear. He visits his Seoul home at the news that his grandfather is dying. Amidst the awkwardness, he remembers something. Ji-yoon is his cousin who has grown up to be a young lady. Gwang-ho is attracted to the fully grown woman and the same is said for Ji-yoon.
Hae-joo continues Dong-woo's story to writer Park. Dong-woo keeps calling men on weekends then one day, a man nicknamed uncle comes to Hae-joo. And Dong-woo and uncle got into a secret relationship with Hae-joo. Park, who listened to Hae-joo's story, gave Hae-joo a massage, and Park began to take over Hae-joo's body.
Three men and three women live in one house and live like a family. They share each other's lives, such as girlfriends, affairs, rent, and live while enjoying their own private lives. One day, when Ye-ri enters the house, a strange energy begins to circulate in the house...
