Eternal Melody - Chapter 34 - I Do Trust You

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.

19 year old son of Earth's Destiny Hero, Shiro Moji, Ryder Dawn is tasked with a fate only he can complete as one of three Destiny Children. As a sophomore of a top university in Texas, Trinity Valley University, Ryder only wants to live a normal life without the stress of being the hero Earth needs.Once Ryder is ready to confront his fate, his mentor and guardian, Charlotte White, takes him under her wing as the The Ace in her organization, Sanctuary Agency.Their main goal as the agency is to stop the Syndicates once and for all, bringing back the peace Shiro and Karma fought hard to bring to Earth.

Edmund Oakforest is expelled from his family after having a relationship with the king's daughter, who was already engaged to the navy commander. To avoid his execution, he is exiled to the unknown with 10 ships and 100 elite soldiers from the oakforest family, with other workers included. After days of travel, he finds himself in an unknown archipelago. Follow Edmund on his great explorations and the rise of a new empire.

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