I've read to chapter 34 and this is probably not the "worst" in terms of writing, but certainly close. Whilst the art is flamboyant (helped by the edgy colour scheme) the characters and plot direction is mundane and often times so fully committed to fulfilling the power fantasy it's shocking. Just from the most recent arc with him getting captured by barbarians we are glossing over the fact that they're practically initially wanted to rape him (and others), that his whole "I should stay back to cut off the big scary monster that could "Destroy Kingdoms"" despite being a mid swordsman shouldn't have worked with his fiancee's uncle, and a whole lot of similar such issues that prop up.
This manhwa is fully committed to the trashy power fantasy. The protagonist has no character - that is, no personality - outside of "get stronger, get revenge, because Hugo le killed me in my le past life!!!" and his plotting is childish at best despite supposedly being 30 years old. He shows no interest in the love interest (but still gets this sort of stuff forced on him because, as a surrogate for the reader, he must get bitches shoved onto him no matter how lacking in game he is). Women are forgiven so long as they're pretty-looking and pose some sort of goodwill. It's mundane. It's typical. It's typical of the sort of power fantasy you'd see from a basement dwelling NEET who has just enough edge to make his OC the colour red instead of just being the black swordsman.
This doesn't mean I don't read nor enjoy power fantasies. However, there is ALWAYS a requirement to show, not tell, to preserve logical coherence in a story (at least to not break immersion or make the characters so stupid they're OOC) and show some originality. Something I would have expected considering that this is rated 9 stars on here.
TLDR: Read this if you're a preteen with enough angst to think that your parents are evil and immature enough to take everything at face value without thinking. Or if you are just THAT out of things to read, and desperately need something to fill the void, even at the cost of enjoyment.