Terror Revives; at This Moment, the World Has Fallen!

The laws of this world! First; ghosts cannot be killed! Second: The only thing that can restrain ghosts is ghosts! Third: Find out the rules of ghost killing, and ordinary people can survive! What a terrifying world this is! Ye Su traveled through time and was involved in an S-level supernatural incident. Fortunately, I got the system and started to control the ghost! As everyone knows, when this incident ends, the entire world has fallen! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.