Destroyers with special abilities will enter some worlds and destroy the original balance of the world. In order to prevent the unknown caused by the unbalanced world from disturbing the central world, a group of "balancers" were selected to "repair" other worlds. They will deal with the troublemakers.
In any case, the "center world" cannot be destroyed.
(No brainer, many plots may be unreasonable)
Purpose: To put the people of the world first