MTL - Raising Evil Spirits - Chapter 8097 : Chuangong

Arnold never thought his gaming skills would land him in a romance novel—as a doomed side character, no less. To survive, he hijacks the heroine's “system,” bending the story to his will. But when he dodges a deadly duel, he catches the eye of the heroine, Lara, his own step sister—and her love is a dangerous game. Arnold must outwit the plot and his step sister who's not afraid to kill for love. In this LitRPG romance gone wrong, survival isn't just about beating the system—it's about escaping the heart of a yandere.

Everyone dreams of being summoned to a magical world.Everyone… except me.I’m Alan. Thirty-something, white-collar worker, zero hobbies, one annoying best friend named Bob. Bob’s an anime-obsessed otaku whose life goal is to become the hero of an isekai world. I just wanted to go home, take a shower, and sleep.But then Bob opened a portal to another world in his living room.And guess who got sucked in with him?Now Bob’s the Chosen One, blessed by world and received legendary weapons and magic.Me? I’m the guy carrying his bags, dodging fireballs, and wondering if fantasy world have proper sewage system.This is the story of how my best friend became a hero……and how I accidentally became his sidekick.

Blind man Chen Dashan by chance acquired the miraculous skill, Sun and Moon Technique, and not only cured his own eyes, but also...

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