An unfounded gem is what this story is. No HOTD stories goes this long. And there is no system or anything like that. And chapters are really long. A must read.
Since you liked this story, mine is pretty similar. Mind checking mine out? It’s a HOTD fic as well. No system, no superpowers, intelligent MC.
Give it a try if you’d like. The title is Tōshiro Nagi