This is a physically symmetrical world where everything exists in pairs with the mirror as the axis. The city is divided into "positive area" and "anti-area" by a huge silver mirror, and residents must travel between the two areas through specific "mirror doors". The positive zone follows the normal laws of physics, while the negative zone has everything reversed - water flows upward, fire is cold, and plants grow downward. Social class is determined by shuttle permissions: the rich have private mirror doors, while the poor can only queue at public mirror doors. The truth of the world is: the two regions were originally the same world, but were forcibly separated by a divine mirror thousands of years ago, maintaining a fragile balance.
Unique Rules/Miracle Elements: Karma Instant Times
In this world, moral actions have immediate physical effects. Doing good deeds (such as helping others, telling the truth) will drop "karma gold coins" of corresponding value from the air, which can be directly used for transactions; doing evil things (such as stealing, harming) will immediately suffer a "karma blow" - small evils will attract stones to hit the head, and big evils may trigger local earthquakes or lightning strikes. The system seems to be absolutely fair, but in fact it is secretly controlled by the "Mirror Administration": they can define what is "good" and what is "evil", and direct a large amount of karma gold coins to the privileged class. What's even more frightening is that humans have lost the ability to dream independently as a result - dreams are considered "uncontrollable karmic disorders" and are completely suppressed by the system.
