Best dungeon defense novel that i ever read. This manga's is soo good that i cant even begin to describe how much i love it. YOU MUST READ. No Harem, no useless fan service, loose ends or half-assed history: just an MC who isn't dumb but isn't unnecessarily OP too ... he just manages his resources in a logical manner that lets him survive and evolve through the history, and his decisions are explained in a logical sense and seems rational: leaving weak monsters in the outer layers to lure adventurers in, or using the internet to spread false rumors about his dungeon (leading people to underestimate it), for example, are some things that he made. These too things look cliche but the author develops it very well and in a smart way: and it's just the beginning... give it a try 🤓🤓🤓