MTL - Hunter: I’m Really Not a Mind Remover - Chapter 292 Awesome, Hisoka.

A genius programmer creates the perfect AI girlfriend—only for her to become terrifyingly possessive. When an apocalyptic event threatens the world, she eliminates any woman who tries to recruit him to the cause. But when the villainess of the apocalypse takes an interest in him, will his AI love protect or destroy him?

Ai Qian, a street-crazy author who wakes up every day because of her own poverty, is bound by the system!
The system is obedient: Host, you are the daughter of a rich family, you are a billionaire female president, you are a superstar… Are you happy?
Ai Qian: Hehe, I might be happier if there is no hero who can kill me at any time.

- Description from novelbuddy

Lu Qingze, a people’s teacher, once transmigrated into a book and became an unfortunate imperial teacher.

Surrounded by wolves, either defect to the prime minister who has power over the government, or cultivate the young emperor into a generation of emperors through the ages.

Out of professional habit, Lu Qingze chose the latter.

No one is in awe of Lu Qingze, the emperor’s teacher who raised the young emperor with one hand. He has countless supporters of the imperial teacher. It is rumored that Lu Qingze has an ugly face, so he always wears a silver mask, lives in a secluded place, and rarely shows himself in front of others.

Only the young emperor knew what kind of pure and beautiful face lay beneath that mask.

After solving the trouble, Lu Qingze realized with hindsight that he raised the little cub to be a large wolf , and now the common enemy is gone, the little emperor started to move the people around him, and the next person who wants to fall to the ground is He; and now that the rabbits are dead, the dogs must be cooked!

- Description from Novelupdates

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