Powerful MC's

I returned from hell, after hundreds of years to save Humanity!
This is another world of hunters and dungeons, however, most hunters specialize in magic as the martial arts slowly die out. But there is one person determined to train hard and master martial arts no matter what: Choi Yeonseung. An opportunity for him finally comes when one of the constellations that watches over the earth asks to form a contract. But things go astray when he gets swept into the abyss...

Humanity's strongest regression action fantasy. "Even if the disgusting gods did it, they still gave the opportunity. if you want to wedge you have to kill them". Zephir, the last survivor of mankind. The lonely battle with the demon lord ended in defeat, but the opportunity given by the gods bring us back 10 years ago—the same gods who treated demons and humans like shit.
MC does have a love interest but romance currently isn't a big thing in the plot
+women here aren't annoying anyway

He learnt the strongest martial arts only to be killed and be reincarnated as a rural village officer as Master Baek, The One Hit Teacher!
5/5 DEFINITELY recommend, everyone who loves martial arts, murim world, and all the common (but awesome) tropes that you'll find in an overpowered MC story will most certainly enjoy this.

Elric Melvinger. The sole heir of the prestigious magic family. Though he possessed innate talent, he had too much talent, and as such, could not learn magic. However, he then received a blessing left by his ancestors! [Eat demons.] [Swallow demons.] [Drink demons.] [Continue to keep accumulating demons within yourself, and achieve new magic!] Reach high. Reach a height so high that no one will ever reach me.
No love interest as of now...

MC is summoned to a game-like world but he wasn't given any sort of over-powered ability, you know the drill. Instead, he's very calculating and manipulative and uses anything to his advantage if it means he'll survive. There is a regression trope in this story, but the MC isn't the one who regresses, it's a side-character in the MC's party (similar to Omniscient Reader's Viewpoint).
There is romance, but the women aren't stupid and actually very useful, even if it doesn't seem so at first.

A video-game-based story where most of the action happens inside of the game. Our MC has returned back to 15 years ago before his beloved video game lost all its value and gamers. Right when the game was fresh on the market and blowing up all across the world, and nobody knew anything about it. With his 15 years of experience in the game, the MC rises to new heights as he quickly levels up and obtains valuable items he would've never been able to even look at in his past life.

I'm sorry... but there are love interests in this story that you may not like, but they're certainly not as bad as some of the other manhwa I've read. They don't interfere in important matters, nor are they nuisances and one of them's actually extremely strong. Awesome story AND EVERYONE'S SO HOT.
No annoying women (by my standards), strong main character, and promising storyline

Yi Zaha. The crazy demon crazy for martial arts. While he was running away after stealing the heavenly pearl of the Demon Cult Leader, he fell off a cliff. After thinking that everything was over, he opened his eyes to see that he had returned back to when he was a waiter… And he is being beat up for something that he didn't do. The crazy demon who returned to the beginning of his days as a waiter! Will he go crazy again, or will he drive his enemies crazy?
10/10 recommend this one!!

The strongest hero of humanity, Kim Sung Bin.
He threw everything on the line and fought… but he still couldn’t prevent the destruction of the world.
However, his legend has just begun as he returns 20 years into the past.
“I’ll definitely… kill it this time.”
Now fully equipped with overwhelming power and experience, the hero’s raid isn’t over yet!

The world is ending. Monsters from legends appear everywhere. They eat people, conquer the streets, and begin to make dungeons in the buildings and subways. If you could choose one job in this decrepit world, what would you choose? For a “necromancer” extinction is my playground and death is my wealth.

The beginning is a little weak, but trust me, it gets good :)