Huang Jiu, who has been practicing for hundreds of years, can be ranked among the immortals just by saying "like a god" from a mortal. But when he was asking for the title, he unexpectedly met Gu Huai, a strange young man who was confused by a book of exercises and humiliated as a tutor because of a ham sausage. It uses its demon power to understand mathematics, physics and chemistry, uses Lagrange's equation to solve feng shui, and uses a laser pointer to help a boy slap his teacher in the face. His cram school in the demon world was prosperous, but suddenly someone from heaven came to visit him. This weasel who knew mathematics and physics was actually handed an olive branch by the Jade Emperor.
