The Geared Immortal - Chapter 521302 Heavenly Samsara:

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.

This novel is also known as Only I Level Up

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as “Hunters”.

However, not all Hunters are powerful. My name is Sung Jin-Woo, an E-rank Hunter. I’m someone who has to risk his life in the lowliest of catacombs, the “World’s Weakest”.

Having no skills whatsoever to display, I barely earned the required money by fighting in low-leveled catacombs… at least until I found a hidden catacomb with the hardest difficulty within the D-rank catacombs!

In the end, as I was accepting death, I suddenly received a strange power, a quest log that only I could see, a secret to leveling up that only I know about! If I trained in accordance with my quests and hunted monsters, my level would rise.

Changing from the weakest Hunter to the strongest S-rank Hunter!

- Description from Novelupdates

In 2177, the world changed forever. The first full-dive VRMMORPG, 'Eclipse Online', was released.With its breathtaking graphics and adventures, countless players and already established guilds flocked to the game, which stunned the entire world and forced the largest conglomerates to act immediately after gold could be bought with money.It was supposed to be the future of gaming.For Yone, it was the cause of his destruction.Starting over once more, he has entered this “living game” again to control his own fate.This time, he will not be controlled by others and will instead walk his own path.“Kill them till they are allies”This was Yone's infamous phrase as he will rise from just an assassin expert to an unprecedented peak in this life.