Perhaps the dullest level-up game system novel I have read out of dozens, there's absolutely nothing here you haven't read before if you've read half a dozen in the genre. To be frank, I read the first forty chapters a couple of days ago, and I could not remember the plot until I opened it to refresh myself.
The MC's personality is wildly inconsistent and he keeps doing dumb things that plot armor saves him from. For example, he gets a key to open up an S-rank dungeon, thinks to himself, "only a team of S-ranks can clear S-rank dungeons", then goes in and almost dies to the first monster and only doesn't by sheer and utter luck that it's in the only class of monster he gets a buff against.
His system has an automatic growth cheat, which is a big problem, because he gets stronger every day with minimal effort... but he still goes off an risks his life for no reason at all, because he has no unusual motivation to do anything. He's almost died half a dozen times in the first 30 chapters, and there's no reason for him to, because he literally gets stronger every single day, and again, he has zero motivation for risking his life.
Also, literally every other person he runs into is a villain out to kill people. This is absurd, because they essentially live in a near-future S. Korea and society and the superhumans are supposed to be well-regulated. He's spent his entire life being a bottom-rank loser and hasn't died, yet as soon as he gets super-powers all of a sudden everyone he runs into is trying to murder people.
It all feels like a barely coherent freshman author attempt in an over-saturated genre, and I just can't understand why this story is rated highly at all.