Three hundred years have passed since dragons and imugi vanished from the world. Worried about the human realm, the Heavenly Emperor orders Yeonmok, the last remaining dragon who went into seclusion after the death of his beloved disciple, to uncover the whereabouts of the dragons and imugi.

Descending to the human realm, Yeonmok encounters a young imugi named Doya, whose true identity remains unknown…