Nurse Eun-joo's phone sex job funds her dad's care. At club La Belle, Big Mama exploits Eun-joo and others. Eun-joo's hospital director lover Joon-ho grows possessive, turning their affair dark.

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. He watches her from afar. In-ik, a nurse at a cosmetic surgery clinic, finds out about Eun-joo and Joon-ho and gets jealous. Then one day, Eun-joo is having phone sex when she gets a weird call and feels as if someone is watching her.