The system is broken, and Su Wanning chooses the wrong strategy target in every world.
She didn't know - those "wrong people" were all the same soul.
And every time she leaves, that person goes crazy.
Five worlds, five pairs of black eyes, five words engraved on the place of disappearance.
Together they are: wait, find, you, return, come.
This is not fast travel, it is traveling through countless worlds just to find the same person.