Who Asked This Red Dragon to Be a Policeman?

In the year 500, the seventh city-state where I was located was known as the city with the best security in the entire continent. I have made an indelible contribution to this. Because of me, a pure-blooded red dragon became a street justice patrolman. After the Great Collapse, the spiritual veins dried up and rune industry replaced magic practice. Runes drive the suspended car through the clouds, and the magic terminal connects the daily life of every intelligent species. In the neon lights of rune colors, elves are innovating the rune academy, gnomes are opening rune stone futures exchanges, and succubi are thanking the top brother in the live broadcast room for the reward. Gauss, a pure-blooded red dragon, studied magic for 20 years after time travel. On the day of graduation, he found that his major was no longer available. His plan to conquer the world could only be postponed, so he had to solve the problem of work first. Orcs are causing trouble in their territory, goblins are stealing underwear, mysterious mages are organizing crimes, drow are trafficking in humans, and so on. Orcs caused trouble in the tavern and flew away with their tails, elves sold people on the streets and burned to ashes with a mouthful of dragon breath, and magicians attacked the police in the street and shattered their staffs with roars. Bring a little dragon justice shock to the multi-racial seventh city-state full of freedom, and help these bastards recall the fear of the dragon lords' rule in ancient times. "Officer Goss, civil rights organizations have complained that you have excessive enforcement of the law and are suspected of racial discrimination." "Let him go to hell, discrimination? This dragon looks down on all races equally. This city needs bad people, and only a dragon worse than scum can trample scum under its feet." (Pseudo-DND/no heroine/daily-oriented/slow heat/this dragon is a good dragon, don't talk nonsense)