Yeon-jeong is a girl crush who has a sexy body and good education. She became a team leader by beating up men her age. Yoo Ah-rin, an intern, keeps getting on her nerves. All she is, is a local university graduate, with a pretty face. A corporate slave! Feeling pity for Ah-rin, who is in charge of her bosses' chores, Yeon-jeong claims to be a shooter to protect Ah-rin from male employees, and Ah-rin, a new employee who thought it was a mugwort, starts to covet her things little by little. Ah-rin, a new employee who she only thought was an idiot, begins to covet her love affairs little by little.
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.
Kim Hak-cheol is a trashy husband who sends his wife Jin Joo-hee to his friend Kang Min-hyeok as a housekeeper due to gambling debts. He visits his wife once in a while and steals money. He borrows money from Min-hyeok, a golden spooner who is Hak-cheol's friend, on the condition that Joo-hee is sent as a housekeeper. Min-hyeok is kind to his friend's wife, Joo-hee. Over time, the true colors begin to emerge. Meanwhile, Min-hyeok's wife, Nam Gyoo-ri, lives together with them without knowing anything about Joo-hee.
The mother-in-law and father-in-law became lovers, the same time as the marriage of Yeong-eun and Jeong-sik. The dizzying cohabitation of middle-aged lovers who stay hotter than a newlywed, and a newlywed couple who can't even burn hot as half of it begins.
