After a person dies, a person with a strong soul can be bound to a system of corresponding strength according to the strength of the soul, and then travel through time to complete tasks. However, all this is just the surface.
The operation of those mission worlds requires energy, and the operation of the main world also requires energy!
The hosts trained in the mission world will have powerful energy and are the objects of competition in all worlds.
Due to the energy imbalance in the main world, a representative is needed to fight, and a war for superiority begins...