Jin knew that taking the challenge by himself was just to fulfill his curiosity about a new world, he would not deny that unlike the business portion of his dungeon supplier store, he was fulfilling the obligations that he had with other minions even though it was not needed for him. Although that being said, he had other obligations he had earlier such as Pandapolis.
He honestly had no idea that a city could be built under his name and it was built to the point where it was not only functional but profitable as well. Of course, the profit margins were considered little since he had been allowing his 'governmental officials' to throw money into the city to improve it to the point that it is comfortable for the people there.
