After Ten O'clock Every Night, Takeout Orders Will Be Delivered to Non-Existent Floors

Delivery boy Chen Mo received an order delivered to the 19th floor. But this building only has 18 floors. The next day, Uncle Zhang on the third floor disappeared. The shoes were still at the door and the TV was still on. There is an additional copy of the "Household Rules" on his mobile phone: do not open the takeout app after ten o'clock every night. If the peephole is red, don't open the door. If you hear someone calling your name, don't answer. The last article of the code reads: If you violate the rules, you may be given a chance to make amends. The person who wrote the code is not sure whether it will work next time.