Thinking about the name and meaning of overhead history is to create a fictional new historical world on the basis of a small amount of historical materials.

With regard to the pirated novels with empty history, many people think that it is an event that people (or others) go through a certain process (or no process for no reason) from their own time and space (let's call it A time and space) to another time and space (called B time and space) for some reason.