When the world becomes a horror game, there is no distinction between black and white, only endless gray, just like a layer of fog hanging over the city. You can't see others clearly, and you can't see yourself. Isn't this a layer of fog covering people's hearts?
When a well needs to be dug to find clues:
Ning Xun: Officer Pei, please.
Pei Fu: Don't you have any hands?
Ning Xun: I have a stomachache and I didn't bring any medicine.
Pei Fu:... It's really the right time for you to have stomach trouble.
Purpose: To expose the good and evil of human nature