Let's Get Rich! Mr. Evil Dragon

How does a gold-eating dragon survive in the modern human world? Transform into a human, of course, to earn money! He needed to expand and widen his business empire for him to earn to earn the coveted dragon throne, thus he had no choice but to hire a secretary, and was even willing to sign a contract for the secretary to become the dragon’s knight. From then onward, they will protect each other and fight together. Turns out the secretary is a dragon slayer?!

(Source: Bilibili Comics)