Best I can explain why there are low scores on this masterpiece is that it just ain't for everyone.

Story: 9 - Isekai, yada yada... Starting point is final boss... blah blah blah, Main character wins by a stroke of luck, and so on~ though that's as far as it goes for the unproductive plotline, the story seems chaotic, there is no end goal as most isekai stories evidently display, the dungeon being a place uninviting to the insentient and a death trap even to the luckiest of the bunch, makes way for the writer to take any route he wants after the vengeance arc is over.

Art: 8 - Just my opinion, don't care about yours. The manga/manhua/manhwa doesn't need to have fills, rich background or complex details in every panel to be great, so long as the characters visibly display emotion, the surroundings of importance are discernible and the level of detail isn't completely botched as an uncolored webtoon.

Character: 7 - Most characters are poorly written, little leading motive, but it's just about counteracted with the development of the protagonist, which gradually recovered from his hatred only to have it fueled with extra topping just moments after his life was finally looking up for the first time. He has grown onto me, I thoroughly adore someone who could bear to lose himself in order to win whatever he has set his mind to.

Enjoyment & Overall: 10 - You're literally observing a teenager as he ventures into layers of hell as though every following level is made to torture him in a different area of his being, he is a ticking timebomb and we await to see this stem of hatred bloom into a beautiful flower of madness!