I suppose this is a korean take on the trope of "really OP guy gets kicked out of a hero party" that is pretty common in manga. Reinvented with the usual korean setting of monsters on earth and what are usually hunters or players or awakened are instead called heroes because... the author wanted the trope to be exactly "kicked out of the hero party"?
In this type of story the reason why the MC gets kicked out matters a lot. Sometimes it is believable, like some guy has really good support magic that is pretty hard to evaluate or the guy does small everyday tasks that are necessary. Sometimes it is less believable, but you can give the benefit of the doubt. Here it is nonsense. In the only fight shown, the MC saves the life of the tank and then saves the life of the mage, in very visible and obvious ways. And then gets kicked out because he is useless by the leader that for some reason seems to have it out for him. It could be fine if it was just the leader, but every party member agrees he is useless including the two he just saved. I can't believe this. My brain just doesn't want to. I don't care if you have an amazing plot twist 200 chapters down the line, i'll drop it at the first chapter (i actually managed to read this for 10 chapters with the same spirit you need to watch a car crash in slow motion).
Then the MC has an ability that "activates randomly in specific situations" (i'm citing from the manhwa) that lets him sees the probability of something happening. What these specific situations are is never explained, it just seems to activate completely randomly. Also, either the skill is always wrong or the author doesn't understand probabilities. The skill says MC has a 12% chance to defeat a monster and the MC decides to fight when he could retreat easily and there are no big stakes. The MC has a 1% chance to do something and he does it because... plot. The MC takes an evasive maneuver during a fight that has an 80% chance to dodge the attack. Man, an 80% chance to dodge against a random attack from the weakest rank of monster is terrible, you will be full of injuries by the end of the day.
Anyway this skill tells the MC that if he joins Epic guild (a random no name guild) there is a 99% chance it will become a major guild. And the MC does it to... prove his old comrades wrong maybe?
Ok, honest question: why? Wouldn't it be better and easier to just join another major guild to prove them wrong? Maybe an even better guild? And it is said multiple times that he could do that. The leader of his new guild tells him that he could easily enter a good guild. A team hunting in the same area as his old comrades wants to extend a recruitment offer. It seems he is recognized as really good by everyone apart from his old party. So, why not join a really good guild?
Then there are tons of other problems, like going in an area where civilians are escaping from by... slowly walking. Why are you guys not running? The civilians are running away, what is someone is still there? Why is the MC walking calmly as if he is going on a hike? Another time they go in a hunting area that seems pretty established. They meet a single random monster with a single guy's head in its beak, and the monster eats the guy (or corpse, it wasn't clear). Just... how? There are supposed to be no civilians, why would a guy go in alone if he isn't able to beat the most common monster in a 1v1?
Situations that could be solved by saying "i have to bring this back to the association, i'll give it back" or "let me buy this" devolve in stealing and fighting. The completely dishonest cleaner that tried to scam them gets hired again because... let's give him a second chance when he didn't even show remorse. Protesters protest by entering areas infested with monsters, lol what? How are they still alive to protest? The bad guys kidnap a few people a day to use as monster food... and nobody notices. That's a lot of people missing.
The best one is the racist (or specist?) bad guy asking malicious and insulting questions in an interview to an half elf and at some point he asks "if the elves invaded, would you fight with us or with them?" and i though the point was that the answer was obvious and he was doing stupid insinuations. Nope. The half elf just makes an unsure face and can't answer the question. Then the MC just steps in to defend her. Wait wait wait. So the asshole is actually right and the half elf is actually kind of dangerous? Because you know, the question wasn't even if she could kill an elf. The other option was literally fighting with the invaders.
Oh and i don't think the art is that good. And the characterization of the MC is also... bland. This doesn't have even one redeeming quality. It's so bad that i wasn't happy with giving 1 and i wrote this.