Bad Guy is a 2010 South Korean melodrama television series, starring Kim Nam-gil, Han Ga-in, Kim Jae-wook, Oh Yeon-soo and Jung So-min. Directed by Lee Hyung-min, it aired on SBS from May 26 to August 5, 2010 on Wednesdays and Thursdays at 21:55 for 17 episodes.

Han Ga-in is a South Korean actress and model. She starred in television series Yellow Handkerchief and Terms of Endearment early in her career, and became a sought-after model in commercials. Her projects in 2012 were hugely successful, with her period drama Moon Embracing the Sun topping the TV ratings chart, and her film Architecture 101 becoming a box office hit.