Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 63

Darin was just a simple blacksmith. He wanted a quiet life, a steady job, and maybe enough money to fix the hole in his roof.But fate had other plans.Thanks to an unfortunate mix of coincidences, a ridiculous prophecy, and some very excitable villagers, Darin suddenly finds himself labeled as the reincarnation of an ancient, all-powerful Dark Lord. Now, knights want to slay him, cultists want to worship him, and political schemers want to manipulate him, all while he desperately tries to convince everyone that he is just some guy.With misunderstandings piling up faster than he can escape them, Darin must navigate a world that insists on making him its next great villain… whether he likes it or not.A comedy of mistaken identity, accidental power plays, and one very confused protagonist, I Was Mistaken for the Reincarnated Evil Overlord is a lighthearted fantasy adventure where every denial only makes things worse.

The god king of Xiaoting in the upper realm fights down, and the spirit of the mixed dragon spirit is reincarnated on the earth, runs rampant in the city, and then fights in the sky.

Those who obey me prosper, those who oppose me perish!

- Description from novelbuddy

I was sixteen when the gods abandoned me.The Blessing Ritual was supposed to grant me power, a divine gift to carve my future. Instead, I received nothing. No abilities. No hope. Just another nameless soul left to rot in a world ruled by strength.Fine. If the gods wouldn’t bless me, I’d make my own power.For ten years, I clawed my way forward, experimenting with forces no human should touch. I pushed too far—and it killed me.Then I woke up.Sixteen again. Back at the Ritual. But this time, something changed.Time bends at my will. Blood moves when I command it.The gods still won’t acknowledge me, but it doesn’t matter. This world isn’t fair, and I’ve stopped playing by its rules. Faith and Chaos clash in my veins, and I will use them both.They wanted a Chosen Hero, someone to dance to their tune.Well, too bad for them—I’ll carve my own fate.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.