You watch delivery riders walking through the streets every day, thinking they are just people delivering food to you. But what if I told you that some people are delivering not just takeaways, but secrets of the city?
Have you ever thought that there are two sets of maps for the city beneath your feet? One set is visible to everyone, and the other set is silently guarded by a group of people who cannot speak. Zhao Wanquan is one of them - an ordinary rider who has been running food delivery for four years and has thousands of secret roads in the city memorized in his mind. Until late that night, he got into the basement of an unfinished building in the old city and found an iron door that shouldn't exist. There was a note stuffed in the crack of the door with his name and a number on it: Observer No. 42.
From then on, he became the "gatekeeper" of the city - guarding the 12 red doors that were buried deep in the ground and could not be opened. He fought against the business headhunters who wanted to cash in the secrets behind the doors. He took over the pen and half of the drawings left by the missing person, and managed two sets of time between delivering food and patrolling dark roads.
If you have ever been curious for a second about the back side of the city, this novel is for you.
