In the Sky Realm, a group of sky islands ruled by dragons, the parents of low-level animal trainer Chu Muyuan were silenced for exposing the sect's "experiment on the bloodline of alien beasts." He hid his talent and tamed the "gray-haired rats" that were considered useless (actually they were of the bloodline of the ancient alien beast "Star Swallowing Rat"). During a sect examination, the gray-haired rat awakened and slapped his fellow sect in the face, and met Su Wantang, the legitimate daughter of the Su family who was exterminated. The two practiced and helped each other, uncovering the human experiment conspiracy of the sect and the dragon clan, and gradually rose to become the strongest beast master in the firmament world, and finally avenged his revenge and protected his homeland.
