When Yoon Seo Hwa falls for Gu Wol Ryung the guardian spirit of the Jiri mountains, their doomed love quickly blossoms in the form of their child, Kang Chi. As a newborn, Kang Chi is sent down a river, and is raised amongst humans. Life is normal as he works for Park Moo Sol at the Hundred Year Inn, until he realizes his otherworldly nature: he's neither completely human, nor a true gumiho. When tragedy befalls his loved ones, Kang Chi realizes he'll need to control his newfound power in order to protect his family and come to terms with his unique identity.