The Story of Living as I Please After Being Reincarnated in Another World with a Ridiculously Cheat Power - Chapter 4: Choosing a prostitute

In a world where magic rules and human nations fight to survive, a 14-year-old stowaway finds himself thrust onto the frontlines of war. With no allegiance but to his own cold logic, Lugh is forced to navigate battlefields of steel, sorcery, and shadows. What begins as an escape soon becomes something far greater—whether he wills it or not.Gunmage – When spell and steel collide, a new kind of warrior is born.

I returned to Earth as the invincible Knight King. But the Gods came with me.

Osho woke up in a world both similar but also vastly different from the Earth called the Azure Star. This world is populated by terrible beasts and vile monsters that at one point pushed humanity to the brink of extinction. However, humans discovered an ability the changed the course of the bleak future. The ability to Tame beasts.As such, Beast taming became the most common profession among humans, and powerful beast tamers have power, wealth, fame, and so on. It is Osho's goal to become the most powerful beast tamer alive, and his unique ability, one that allows him to evolve his beast's, makes that all the more possible.

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates