Third Night Rules

The night my sister disappeared, all that was left behind was a note saying "Long Night" and an old-fashioned broadcast recording with an almost eerie tone. Gu Yu entered her password, and the system popped up - "Welcome back." It mistook him for Gu Wan. From that day on, Gu Yu entered various spaces called "copies" as an "agent": ward 318, which cannot be silent, a vacant chair that needs someone to sit on, and a bowl of tea that must be drunk before dawn. The rules are written calmly, but the traps are hidden in the most inconspicuous wording. He wasn't the only one looking for someone during the long night. And Gu Wan's name was gradually changing from "missing person" to the "to be determined" position on the waiting list.