
In movie P.S. Girls 2016, Eun-joo dreams of becoming a plastic surgeon while working as a nurse. At night, she works as Nabi, having phone sex to earn money to pay for her father’s hospital bills. The boss of La Belle, Big Mama, pays the girls in advance and forces them to perform sexual acts such as using body cams while robbing them of their money. At La Belle, there are Candy, Cherry, Eunmi, and other girls with different stories, but they all have the same job of having phone sex with men. Meanwhile, Joon-ho, the director of the hospital where Eun-joo works, begins to take an interest in her because she resembles his deceased wife and they develop a romantic relationship. However, Eun-joo does not open up to him, leaving him frustrated.
The more Eun-joo pushes Joon-ho away, the more obsessed he becomes with her, until one day he sees her coming to her night job. He secretly watches her from afar. In-ik, a nurse at a plastic surgery clinic, discovers the relationship between Eun-joo and Joon-ho and becomes jealous. Then one day, while Eun-joo is having a sex call over the phone, she receives a strange call and feels like someone is watching her.