Rumors of a fire-demon resurrecting a twenty-year-old tragedy drive Prince Lee Dam deep into the Joseon wilderness to hunt the beast. But the monster he encounters is no ordinary creature. It is a massive, blue-furred beast that drags Dam into its dark cave, only to transform into a captivating man. Gyeol, the mythical Haetae, holds the prince captive with a single question: "Are you the first prince who survived the flames?" Entangled with a legendary entity who knows the secrets of his past, Dam must navigate a dangerous bond where mythical power and buried royal truth collide.