Centuries ago, fox spirits were hunted to extinction by humans until only one remained. Yuna, the last nine-tailed fox, awakens from a curse when a desperate girl begs her to save her dying sister. To reclaim her stolen tails sealed within the royal palace, Yuna disguises herself as a dancer and crosses paths with King Renjiro, a lonely ruler bound by duty and secrets.

As forbidden feelings grow, buried memories resurface, revealing that Renjiro is the reincarnation of the king who once betrayed Yuna and destroyed her kind. Now torn between revenge and love, Yuna must decide whether to burn the world that hurt her…or walk away from it forever.