Florist Ae-ran and forensics investigator Min-ho from the Public Prosecutor's Office both have a family that everyone wants. However, Min-ho can't handle bed time so Ae-ran starts a 'challenge game' in which she seduces and has sex with strange men. One day, Ae-ran and Min-ho meet Alex at a tango cafe. Alex is interested in Ae-ran and approaches her while Ae-ran takes interest in Alex who is more handsome than her husband. Min-ho later witnesses them in action and gets angry when he finds out the man Ae-ran seduced is Alex. Min-ho feels nervous because he finds out Alex isn't just a game partner and approached him for a reason. Min-ho tries to get rid of Alex but Alex chokes Ae-ran and Min-ho even more and feels catharsis. The game they started is turning into a catastrophe...

Eun-joo dreams of being a plastic surgery specialist while she works as a nurse. At night, she has a job as Nabi, having sex on the phone to come up with money for her dad's medical bills. La Belle's madam Big Mama pays her girls in advance and forces them to do sexual activities like body cams while she rips them off their money. At La Belle are Candy, Cherry, Eunmi and other girls with stories but have sex on the phone with men. Meanwhile, Joon-ho, Eun-joo's hospital director starts showing interest in Eun-joo who looks like his dead wife and they develop a romantic relationship. However, Eun-joo doesn't open up to him so he starts to feel disappointed. Joon-ho starts getting obssessed with her the more she pushes away from him until one day he sees her going to her night job.

Seung-gi has been living under a strict father, blaming himself everytime when a natural but uncontrollable desire surges from inside of him. However, because he can't spurt that desire in reality, every night Seung-gi shares passionate love with a mystery woman in his dreams. He meets Eun-ji ("Viki") a senior from school and gets provoked by her as well as Soo-jeong who he's had a crush on forever.

Jin-ah, a radio host and singer, works hard to make sure she does well on air. When she is accused of plagiarism, her life is turned upside down and she must revive her career.

Ha-yeong is a successful psychologist. One day she gets a secretive request from her sister Ha-joo. Apparently Ha-joo's husband Woo-seong is refusing to have sex. Ha-yeong agrees to be their couple therapist but finds out that her brother-in-law actually has sexual desires for her and not her sister...