Is My Colleague a Demon?

My name is Changsun Yufan. I was born in the royal family. I am the son of the Changsun family, one of the three high castes in the demon world. I own everything, wealth and land, including the lives of any lower-class people. I was persecuted and reborn in a different world, and the strength that had nearly reached the top of the world was actually controlled by a servant named Yu Fan. Before rebirth, for people like Yu Fan, I could decide their life or death with just a raise of my eyebrows. I just feel that this place is extremely dirty and despicable. ... I am Yu Fan, with mediocre talents and an ordinary soldier. In this life, I will probably spend my whole life fooling around in the mortal city to trick the old man into coming to me to eliminate demons. This kind of life is a bit satisfying, but I can't break through and go to the fairy mountain outside the mortal city anyway. That day a strange man came to the military station. This person has no emotional intelligence. He always says weird things and has a bad temper. He is always punished and punished. He is just like a psychopath. Nowadays, we are in a society governed by the rule of law. "Let me go, how can I use his cultivation level? A full-level title from heaven?"... ... My name is Fan, and everyone is Fan.