The Ghost Rises From the Coffin

Before Xie Ban gui set out on his journey, his master's only advice was: "Don't ask what's inside a coffin unless you're actually going to open it! Don't ask what's buried in a grave unless you're actually going to dig it up."
Xie Ban gui: "What exactly does the Ghost Bureau do?"
"They kill ghosts and humans alike; they protect the land and plunder tombs; they are both human and ghost."