Qin Ding transmigrates into a world of beast taming, where his parents disappeared after entering a spirit realm six years ago. In search of them, he awakens the Illustrated Compendium of Living Beings and forms a life-and-death pact with Da Hei, a black dog, gaining growth feedback in return. Using the compendium to discern spirit beasts' bloodlines and evolution paths, he trains Da Hei and hones his martial arts, winning the class monitor selection. His friend Bai Muxue also embarks on the path of beast cultivation. During an outdoor class competition, they face spirit beast attacks and schemes. Through battles for survival, they grow stronger while gradually uncovering the mysteries of the spirit realm and the truth behind his parents' disappearance.