Help Me Find This Webtoon PLEASE!!!

I read it about 4 years ago. When I stopped reading it it was about 600 chapters. Action, fantasy In this story some people have mana that can be used as powers. all mana is controlled by Gaia, the creator of earth. Beginning: (btw Mc plays a shit ton of video games. I swear it’s important.) MC stumbles onto a fight in what is called a “dungeon” dungeons stop anyone from seeing/hearing in, and stop anyone from entering (except for the mc for some reason). They can run at a different time than the outside world and they can be made by people or spawn randomly. In this dungeon two people are fighting, a red haired girl with fire powers and a strange cloaked man. Mc jumps into the fight and confuses the shit out of everyone. Cloak dude fires a live slime at mc and the original two carry on fighting. Mc struggles for a bit with the slime until the generic blue pop up window shows up and says “learn skill: rip?” Or something like that. He learns it, frees himself from the slime and leaves. Mc later is talking to his best few when he mentions what happened, friend immediately takes mc to a private area and tells world lore, explains what dungeons are, and what mana is. Friend then also tells mc that he is secretly a part of a martial arts clan. Mc leaves and try’s to figure out what kind of mana he has when he accidentally opens a skill tree/attributes window. He has fucking gamer mana.

There’s more I remember that I don’t have a timeframe for, but any help would be greatly appreciated and I will try to answer any questions you have.