Su Nian, a graduate student in modern animal husbandry, was struck by lightning and traveled to a world where humans, gods and demons coexisted. As soon as he landed, he was almost eaten by the black python demon Lord Mo Lan. He relied on his professional skills of "treating animals" to survive in the demon world. He also managed to break through the confrontation between the three worlds with his mouth, and was invited by the emperor to cure the plague in the imperial horse prison.
