It baffles me how different the manhwa and novel are. In the novel they are very careful explaining every single detail of the world and how things work while having (at least till chapter 142) no smut at all.
Here in the manhwa i guess they just decided to skip all the important lore explained in the novel and replaced it with smut. For example, in the novel, the first 20-30 chapters are about how the characters met and lived their lives in that first kingdom. In the manhwa they converted that into 2/3 chapters.
Lets not even talk about the important characters that appear in the novel that the manhwa doesn't even mention TT.