Powerful MC's

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will.

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge.

Gamin Yoon, a 17 year old student, goes to a school known to harbor future criminals. Stuck in a carnivorous environment where only the strongest survive, he struggles to get good grades to enter a 4 year university. But, will he be able to study well enough to enter university, or will he get involved in the unending fights around the school?

Hunter Sung Jin-woo started out as a weak E-rank hunter barely able to provide for his sister and mother's hospital bills. But after a failed dungeon capture attempt, he's suddenly able to get more powerful thanks to this 'system'.

I dropped it on my first read actually. I think I was insane because this is literally SO GOOD.

The worst student of Westrod Academy, the disgrace of the Blake House.
A new soul enters the lifeless body of Frey Blake, the boy who couldn’t handle his painful life and chose death instead.
“What’s with this body?
I’ll have to check every little detail of it.”
The Great Mage Lucas Traumen.
He earned his chance at revenge by gaining the flesh and bones of Frey Blake the disgrace!
And now begins the interesting adventure of the Great Mage who returned after 4000 years!

When I opened my eyes, I was inside a novel.
[The Birth of a Hero].
[The Birth of a Hero] was a novel focused on the adventures of the main character, Choi Han.
Too bad I became the Trash of the Count family who ends up meeting his demise at the hands of Choi Han. No way is that gonna happen. Let's live a good life away from all the action.

You can probably guess how that turned out.