MTL - Admiral in the Marvel Universe - v2 Chapter 345 is this what you were looking for

[WSA 2025] To confront the threat posed by monsters and demons, humanity summons a hero endowed with a mysterious system and an unrivaled capacity for evolution. He becomes the last bastion of hope for mankind. However, one of his mistakes gives rise to a calamity far worse than the Demon King.This calamity is conceived in a dungeon, abandoned as a fetus by its mother, and raised by the Demon King himself. Upon the Demon King's death, all the restraints he had placed upon the creature are shattered. Thus, the hero's nameless son begins to lay waste to everything. The greatest calamity the world has ever known is born.

[R18 novel with a lot of sexual content]Artem never expected to take on the role of a villain, let alone transmigrate between harem novels. Bound by a system, his task is clear: steal the heroines from all the protagonists’. From Chinese Cultivation and Korean Gate to Japanese Isekai Fantasy, VRMMORPG, and beyond—no heroine is off-limits, and no protagonist is safe!

A character with extreme difficulty and the worst performance, Baek Yu-Seol was considered tr*sh in the game because he couldn’t use magic in a fantasy world where everyone else could.

However…

[Due to the wrong ending, 90% of Aether World has been destroyed.] [Please reach the ‘True Ending.’]

Suddenly, those words echoed in my mind before I was transmigrated to the Aether World.

[You can use the skill ‘Flash’.]

“Why did I possess this character?”

Flash was the only magic skill I was given.

Surviving in Stella Academy where many genius mages ran rampant, I became the notorious Flash Mage.

I am the best when it comes to taking divergent paths. With just a flip of my hand, I shall take the path less commonly travelled. I search far and wide, only to find myself unbeatable and unrivaled. So now I ask, who else can match my awesomeness?

Acting tough is second nature to me and I am a lone wolf.

The road is long and winding but I shan’t feel lonely as long as I am able to act tough!

Life and death bore me and I do whatever I deem fit.

“Young man, way back when I started acting tough, you were still learning how to put on your underpants!” Xu Que thus decided to take the path of acting tough. He decided to act tough every single god-damned day. If he wasn’t acting tough, he was scheming for the best way to act tough!