In a desperate moment, Bai Yan, a princess of the mortal realm, saves the divine beast Bai Lang. As she lies on the brink of death, Bai Lang seals a "Spiritbinding" pact with his heart's blood, tying their fates closely together from then on. They weather the mortal realm's trials together and eventually return to the Spirit Realm, where they uncover the mystery of their origins.
