The Joes was a party or the official of the United Sovereign called them a mercenary group. The reason they were called a mercenary group was because they were not part of the United Sovereign. They were a free group with no attachment to the United Sovereign.
Freedom was the reason why they did not join the United Sovereign. Of course, they must pay the price for their freedom. They were not allowed to get talent from the smart base, and they could not take the dungeon without the United Sovereign's consent. In order to delve into a dungeon, they must pay a certain price. It was based on the rank of the dungeon. Not only that, they must share thirty percent of their loot in the form of "tax".
Despite the drawback, they remained in the United Sovereign instead of moving out. They heard that in other places, they were forced to join the faction if they wanted to stay in their territory. Despite their bad situation, they remained because this was where they were born and raised.
