A Person Becomes a Lord in a Dungeon and Solicits Bids from Blue Star?

Eighteen-year-old Wilson was forced to inherit a territory from his family because he had no talent for learning magic. On the first day he came to the territory, he looked at the piles of gold in the palace warehouse and sighed helplessly. After all, in this world, the most valuable thing is gold. Just when Wilson didn't know what to do next, a system appeared in front of him "What? I only need a little gold to let these monsters from (Earth) help me build a city?" Since then, many things that are not of this world have appeared in Wilson's city. "Oh, my God, even the great magician in the main city cannot drive such a huge train!" "I must marry my princess to the lord of this city!" "No! You can't attack this city, the lord here is a devil!"