Mo Yiao, a food delivery rider, accidentally crosses into another world where ferocious beasts and magic coexist. Due to a system error, he is turned into a chubby orange cat and immediately hunted by humans. At the brink of danger, he encounters the evil dragon Orcus and unexpectedly activates the Adopted Son System. Whenever a ferocious beast calls him its adoptive father, he can inherit its power. Mo Yiao takes the demonic dragon as his adopted son and gains its power, but the overwhelming strength exceeds his orange cat body's limits, leaving him on the verge of collapse. While trying to repair his body, he successively recruits ferocious beasts, including the Bone-Shattering Rabbit, the Vajra Demon Ape, and the Unicorn. After repeatedly foiling the Beast-Hunting Hall's schemes and stopping the High Priest's forbidden magic, he saves countless ferocious beasts and ultimately ascends to become the Lord of Ferocious Beasts.