Hee-ran was a karaoke mistress when she first met Se-min through a marriage consultant company. He suggests they should have a contract marriage; she would get paid every month for being his wife and Se-gyu's mother. Hee-ran thinks this is a good deal but unlike her thoughts, being married is boring. Se-min only needs her at night and Se-gyu has a crush on Hee-ran who is like an older sister but hides it by being nasty. One day, Hee-ran meets Se-min's friend Tae-yeong and falls for him. In the end, Hee-ran and Se-min break up...
Ga-eul is six years into her marriage but her trouble with her husband brings her to depend on alcohol. Hee-mang is a writer who lives next door but can't stand the fighting going on at Ga-eul's house and makes his way over there one day. Ever since then, Ga-eul goes over to Hee-mang's house to have sex everytime she fights with her husband. Hee-mang is confused at her behavior and gradually falls for her. Then Ga-eul slowly resolves things with her husband but Hee-mang asks to talk with the three of them...
