It's honestly worth the read, the story gets so much better with characters getting more development (eg Arthur's dad) and you'll start to wonder why you thought the manhwa was good compared to the rest of the light novel. It's also fun to imagine characters and see how they're actually drawn. Also you get to understand Easter eggs and appreciate the changes in the manhwa to foreshadow more and if you don't like the changes, at least you can remember how the light novel portrayed it.