The Terror Keeps Coming

[Night shift job + constant strangers + suspenseful reversal] On his first day on the job, what Qin Yang got was not an employee handbook, but a yellowed "Code for Avoiding Death": Rule 1: Customers entering the store after midnight should not ask where they came from. Article 2: The extra person in the mirror does not belong to this store. Rule 3: Never press the red button under the cashier for anyone else. He originally thought it was just to scare the newcomers, but one after another of bizarre murders, the "notes" on all the rules were torn open for him to read - it turned out that he had been selected long ago.