Are there really ghosts in this world? Maybe.
Maybe someone actually could actually see it.
Do you know Yin Yang Eyes? A folk legend.
In our eyes, those fortune tellers on the street and Taoist priests who exorcise ghosts in the mountains are just like fools, swindling and deceiving people everywhere. But we are not them, and we don't know whether they can really see anything.
You can not trust a person, but you cannot disrespect him.
Purpose: to protect