"Why don't we kill that demon?"
"Do you think it's easy for humans to kill demons?"
"There is a barrier between the human world and the demon realm. There are very few humans or demons who can travel twice. However, in the past three hundred years, the Yun family has encountered several demons that broke into the human world, but none of them knew the soul-killing curse. Or they knew it but didn't want to tell them."
"Why?"
"If a demon asked you how to kill a human completely, would you tell him? Even if he repeatedly promises that the person he wants to deal with is not you, how can you be sure that he is telling the truth?"
Intention: I would rather be a piece of jade