Corpse Nightmare Town Starts with the Dead Borrowing Their Faces

My name is Chen Yao. When he was five years old, he was adopted by his grandfather along with his four brothers and sisters. He taught us a technique called Corpse Nightmare Town. Controlling corpses, refining evil spirits, witchcraft, borrowing lives - none of them can see the light. After my grandfather left, no one protected me, so I kept hiding here and there. Today, I received a letter. Sent by grandpa. There are only four words on it—— "I'm back!"