Dragon Tamer - Chapter 898 - 902 Street Interrogation

In a world of wizards and witches, Jaegar undergoes reincarnation and enters a mysterious realm. Driven by a desire for pleasure, he embarks on a journey of self-discovery, encountering challenges and uncovering secrets along the way. As he explores the magical arts, Jaegar's pursuit of pleasure shapes his choices and drives him forward, leading to both fulfilment and consequences. This is a story of a young man's quest for pleasure in a new and enchanting world of wizards and magic.

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

One moment I was a grown man—an engineer with a decent job and way too many spreadsheets. The next? I woke up in a kid’s bed, staring at glow-in-the-dark stars on the ceiling… in Malibu.Turns out, I’m Jake Harper now. Yeah, that Jake Harper.“Wait… I had a bitchy mom and a simp dad?”Yeah, the behaviors don’t make sense — just roll with itYeah, the years don’t match — just roll with itpatreon.com/MHJunior(I am not the owner of any show, credits to their respective creators)

A tree of 10,000 flowers, the world is the door.
The spells change a lot, but the hearts of the people are unchanged.

- Description from Uukanshu translation