This world is almost the same as the world that ordinary people know - there are noisy cities, quiet alleys, ordinary people running to make a living, and passers-by with hidden worries. There are no super powers, no high-tech abilities, and no alien civilizations, but there is a hidden world hidden by the big people. The "gap in the rules" that most people forget: Anyone who has obsessions and encounters "unexplainable regrets" will be directed to an alley that does not exist on the map at a specific time (the "grey hour" at the junction of dusk and dawn) - Luochen Alley.
At the end of Luochen Lane, there is a "Strange Mark Grocery Store". The grocery store does not sell ordinary goods, but only "accepts" obsessions and "exchanges" regrets - customers need to hand over a "token" related to their obsessions (a faint "mark" will naturally appear on the token, which is called a "strange mark"). The store will help customers realize a wish to "make up for their regrets", but the fulfillment of the wish never follows common sense and is often accompanied by a strange chain reaction. Every "exchange" will leave a mark on the store, and will also leave a vague fragment in the memory of the owner Zheng Biaosui.
