I, Ryan, was once the most powerful magician in the empire, but now I am on the verge of bankruptcy and am forced to be the director of the magic academy.
On the first day of school, I silently took out a copy of "Advanced Mathematics" in front of the most useless students in the continent.
"Students, starting today, we will teach calculus."
The students laughed wildly, and the magic instructors also protested.
However, the moment the chief mage of the empire saw my teaching materials, his face turned pale and he knelt down trembling: "It's... It's the long-lost book of the origin of magic!"
