Download Full Theme OST Gu Family Book [ Download] Track List Theme OST Gu Family Book: Root of Evil. The Rough Breath. Sympathy. Kill That Beowulf. Darling of the Congestion. Root of Evil (Piano Ver.). Before the Storm. Dance With Fox [ Download] Fill Sorrow. Red Sun. Eagle Fly Free. Libera Me. Watch full episodes of Gu Family Book and get the latest breaking news, exclusive videos and pictures, episode recaps and much more at willonorth.comors: Lee Seung-Gi, Bae Suzy, Lee Sung-Jae. Gu Family Book (Hangul: 구가의 서; RR: Guga-ui Seo; also known as Kang Chi, the Beginning) is a South Korean television series starring Lee Seung-gi and Bae 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 willonorth.comal network: Munhwa Broadcasting Corporation.