Deliver the same meal to the mountaintop villa at 11 o'clock every night for a week: blood sausage for one person. Customer messages always read: "Don't knock, leave the door open, and leave quickly." The elevator was out of order tonight, and when I was climbing the stairs, I heard sobbing from inside the house: "Help me." Through the crack in the door, I saw a note on the ground, which said: "You are next." The phone suddenly vibrated, and a new order popped up: "For the delivery guy in room 806."