Lin Bei, a young man burdened with debt, takes over his family's abandoned zoo and joins as a veterinarian earning 100,000 yuan a day, unaware that every animal in the zoo is an S-rank ferocious beast. Using old-fashioned methods of training dogs and monkeys, he accidentally activates an ancient pact and tames divine beasts such as Tiangou, Zhuyan, and Zhuyin, never realizing that he has become an urban legend. When a beast tide descends, Lin Bei awakens to his identity as the Lord of Divine Beasts and leads them to fight alongside ordinary people. In the end, he resolves a thousand-year feud between humans and beasts through sincerity and equal contracts, protecting humanity's home.