People who have strong obsessions due to hatred and longing during their lifetime will go to a place of despair and depression... That is chaos, between reality and hell.
Every ghost with obsession can pull a person in reality into chaos to resolve his obsession and turn him into a savior. This is unfair to people in reality. But in order to maintain world order, this rule was acquiesced by the origin of the world.
... Oh, by the way, don't try to reveal too much truth in reality. The origin of the world and chaos will not let anyone believe you.
If you can't stand it, change your mind, and want to stay here forever, that's no problem.
Concept: The bond between friends can be so important that it spans life and death.