I don't know why it's not popular. The logic is very rigorous and the narrative is very clear. It's rare to see an author who talks about different worlds and clearly explains the world view. It doesn't have too strong a dungeon, and the story line has been explained clearly in Chapter 50. (In the books I read before, the main plot was not unlocked in the first 50 chapters) There are no side characters, they are all foreshadowing. Finally let me eat fine chaff.