Originally, there were many groups planning to build underground cities as well. That was because the underground city had an obvious advantage. Once they persevered once, they would be able to comfortably fight against the monsters. Because of the form of the underground city, the siege war among the groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of groups of people would be able to conquer the underground city. Secondly, the defense of the unde
