Choi Kang Chi (Lee Seung Ki) was raised by the Choi family after having been picked up from the river. Choi Kang Chi is the son of Gu Wol Ryung (Choi Jin Hyuk), the guardian spirit of Jiri Mountain, and Yoon Seo Hwa (Lee Yeon Hee), his human mother. Kang Chi is an outspoken character who's full of curiosity. He realizes that he's a half-human-half-beast through a certain incident and starts living his second life.
Dam Yeo Wool (Suzy) is a master of martial arts and archery. Yeo Wool is an upright character who really values the Three Bonds and Five Relationships in Confucianism, and becomes an instructor at a martial arts center at a young age.