Lee Yubi is joining the cast of Gu Family Book, where she will play gumiho Lee Seung Gi's first love. Her character is the daughter of the man who saves Lee Seung Gi's life as a child. The actress will complete the triangle between Suzy and Lee Seung Gi, as she will rival for Lee Seung Gi's affection when Suzy's character comes into the picture. Gu Family Book will be the actress' first saeguk. Excited for another saeguk newbie? (Source: www.dramabeans.com)