Choi Kang Chi is a half-human and half-mythical-creature who was adopted by the lord of the Hundred Years Inn. He was the son of Gu Wol Ryung, the guardian spirit of Jiri Mountain, and the human Yoon Seo Hwa.
Dam Yeo Wool is a martial arts master and daughter of the leader of a secret organization protecting the region. She was sent to the Hundred Years Inn to observe and protect its
