Sung-wook runs “Karaoke Crazies”, a slow business karaoke in a rural town. When Sung-wook offers a karaoke singing along job to boost sales, Ha-suk, a girl in her early 20’s, comes along. She’s a hopeless game addict and lacks talent, but soon she starts to use a special tactic to lure customers in. Then Na-ju, a professional singing along helper, insists to help and she is like a savior, turning up the read moremiserable place with her bubbly character. Just when they are ready to come out of shade, little do they know that a serial killer on the loose in town is after something in the karaoke.