Gu Family Book is a 2013 South Korean television series starring Lee Seung-gi and Suzy. The fusion martial arts action historical drama is about a half man-half monster who is searching for a centuries-old book that according to gumiho legend, contains the secret to becoming human. It aired on MBC from April 8 to June 25, 2013, on Mondays and Tuesdays at 21:55 for 24 episodes.