For the past five years, Choi Bo-na ([[Lee Si-young]]) has been overworked and underpaid as a second assistant director for TV commercials. Sorely lacking social skills, self-confidence, fashion sense, and aesthetic polish, she is casually disregarded by her work colleagues and knows that her career is going nowhere but can't do anything about it. One night, she hits rock bottom. Stranded on a beach in the middle of nowhere after a grueling outdoor shoot, she comes across an eccentric middle-aged man selling inspirational videos. He urges her to buy his masterwork, "A Manual on How to Use Men," telling her that it will change her life, and give her the skills she needsneed to find success and happiness. She doesn't believe him for a second, but she buys the video. After reluctantly following the step-by-step instructions of self-styled guru Dr. Swarski ([[Park Yeong-gyu]]), Bo-na's life takes a drastic turn. She begins to experience professional success and men suddenly start flocking totowards her, (including top [[hallyu]] star, Lee Seung-jae ([[Oh Jung-se]]), who initially treated Bo-na with disdain, but later falls head over heels in love with her).
