It is a story of Jeon Woo Chi, the guru who gained his powers by swallowing a Gumiho's bead, and his revenge on his friend’s betrayal, which caused him to lose his father-figure Hong Kil Dong and his lover Hong Moo Yeon. So in order to avenge their deaths, he travels to Joseon and becomes a reluctant hero for the people. Hong Mu Yeon is a princess, the granddaughter of Hong Gil Dong, and the love interest of Jeon Woo Chi. ~~ Adapted from a novel.