Zhongcheng Building has only twelve floors. In Zhang Ye's third year as a night shift security guard, the elevator stopped on the 13th floor at 22:47. In his hand was a copy of the 7th edition of the Night Watch, which had expired three years ago. The building revised it every year and destroyed old versions in public, but he knew which items had been secretly changed. The code will be established for 180 seconds if you read it out loud. If you read a wrong word, you will be registered once. The entire building relies on sound to locate itself. If you don't make a sound, it will treat you as if you don't exist. The duty group reported safety at 23:00 every day. Zhang Ye remembered that there should be fourteen people. The missing one, he couldn't remember who it was. Only later did he understand that 013 was more than just a job number—it was a position. Every 013 has been replaced by this building on time.
