Ko Sun-young (Soo Ae) is a popular TV speaker and midnight DJ who has decided to quit her job after her daughter Eun-soo needs heart surgery in the US. On her last day at work, her sister Ah-young babysits her niece in her apartment. While in the air, Sun-young gets a phone call from a man named Han Dong-soo (Yoo Ji-tae), who claims to be her fan. Dong-soo is a crazy man who has killed many people and he tells her that he has kidnapped her family and that he wants her to play the songs on his list. If Sun-young does not do what he wants or call the police, he will kill her. She is frightened, follows his instructions, plays the songs he has told her, and continues her late-night show while the tension between them increases.