The more charming a demon’s smile, the more danger it contains

Demons worked hard—did you know this saying? It wasn't just that.

Demon Lord worked swiftly.

I had no idea how much money it would need to construct a teleportation array wide enough to contain the whole material plus workers to build a permanent teleportation portal—and at this point, I was too scared to ask. He could just use carriages to bring all of those materials and workers, but no—he had to use the expensive massive teleportation array.

Looking at the golems and demon supervisors taking up all the materials to the highest floor, I was tempted to ask Zia how rich Natha actually was. But before I could utter anything, the succubus already made a comment first while hovering above my shoulder.

"That cousin of mine never spends money on anything, but look at what he does after you come," she muttered while leaning on my shoulder, watching the train of materials passing by. "Feels like he saves all of his wealth just for you, huh?"