I'm rating this 9 because it's doing everything right So far for what it is, an action fantasy "Shonen". So far there's only 40 chapters. There's not much to say about the plot and the world building. It's doing what it's supposed to do.
If you like this genre, you should enjoy this manhwa.
The art style is pretty, characters are not overly cute.
The pacing and structure is good.
What makes this stand out is that, unlike many protagonists in this genre, the protagonist in this story is stoic and taciturn, not overly righteous. He is not educated given his background, but he is smart and react to situations in a realistic way.