In this world, everyone has a goal. They are given this goal at the age of 13. Once you complete this goal, you die. Then you ae reborn with a new goal. It's a cycle. Sounds cruel, but think of it, plainly, as organization. But of course, nothing ever lasts. So, rebels were created and inside allegiances were made. Trust no one. To put it simply, this world gave everyone a purpose to live.