An Xu has been in a closed space as long as he can remember. This space was sometimes completely black and sometimes completely white, but An Xu stayed here and couldn't get out.
Until one day, a mechanical voice sounded in his ears.
"Detection completed, system starts."
This sudden voice said, "If you want to leave, you must complete the task he gave you." If An Xu can complete the task perfectly, he will be able to leave here. An Xu always believes that as long as he leaves this space, he can remember his identity.
An Xu helps the Children of the World in each world according to the tasks given by the system, so that the Children of the World can achieve the mission goals.
PS: The main recipient.