Towards the beginning, before chapter 13, it was a great novel. It wasn't the most unique story, but the situation that the MC found himself in was interesting. When it comes to world building, we're limited on the info, and with the magic and power system, we're even more limited. Inori is supposedly stronger than the world's strongest human, incuding the "heroes." World Building: 6/10.
Now towards character development, we are not shown a lot of internal traits. Inori's character change seems extremely sudden after ch 13, too unnatural, considering that he never showed such a terrible physcopathic and illogical state of mind before. Some might argue that it's because of his power gain after dawn, but I think that it has to do with poor writing and rushed storytelling. Besides Inori, nobody else was ever focused on enough to be a candidate for character development. Character(s) Development/In General: 2/10 (mercy points).
Now onto the real story changer, the plot. As I've said before, this novel had great potential. There could've been awesome fights against heroes, monsters, and wars, there could've been secret missions and fiery rivalries, maybe even a small little romantic flair. But of course, at chapter 13, everything switches up. Somehow, ALL the royal knights are traitors, the heroes are beaten and imprisoned, the 2nd princess isnt killed by the 1st boss(worlds strongest human), and in the end, Inori clutches up and creates his first secondary vampire. It may sound cool, but after all the royal aspect of the story is destroyed, I can see no potential in the story. The power scale is terrible, as Inori kills the world's strongest human, then Inori calls himself the next demon king, but there is nowhere else to go.
When it comes to the romantic bit of the story, it's 2/10. It had potential with the second princess, but was forced. Along with that fairy near chapters 23-38 who was also forced and random. I have to rate this story's plot a solid and generous 3/10.
This novel was a waste of my time. I really liked it at first, but it was a dissapointment. I really hope that the webtoon adaptation doesn't follow what happens after ch 13, that would kill it.
Overall rating*: 3.6/10 or -----> 1.8/5
*Not including other factors like decent artwork, ok pacing, etc. To balance out the two bot 5 stars, I should've rated this a 1/5 which is still fair, but I feel generous.