Agricultural mechanic Lin Ye transmigrates into Lord Lao's Green Ox. To escape his fate as a mount, he brings the Diamond Jade to the mortal realm and sets himself up as king in Mount Jindu. He eats no humans and robs no grain; relying on his skills in repairing water wheels, making salt, and blacksmithing, he leads minor demons to reclaim wasteland and make a living. Just as life begins to improve, Tang Sanzang and his disciples mistakenly enter the stronghold, heaven and Mount Ling investigate, and the secret of the stolen treasure gradually is exposed. The immortal treasure can collect divine weapons, but it cannot stop fires and floods. To protect his partners and fields, Lin Ye decides to shoulder the blame and return the treasure. From borrowing immortal might to establish himself, to earning trust through labor, he realizes that a true Ox King relies on responsibility and skill.