An unposted black letter broke Jiang Yan's peaceful life.
Those who receive the letter will be forcibly pulled into the [Echo Office Building] at midnight, and step into a cage of obsessions built by millions of human guilt and regrets.
There are no ghosts and gods here, only the rules of survival that are tampered with at any time, the lingering phantom of obsession, and the players who have their own agendas.
Violation means removal.
Because Jiang Yan jumped out of the preset hunting trap, he was branded with the unique mark of "Rules Polluter". He can see the flaws in the rules, but he also has to bear the price of inner demons corroded by negative thoughts.
Self-interested people believe in sacrificing the few to preserve the majority, while the lost people are divided into two factions, each holding its own position. In the real world, there are still criminal police secretly tracking the traces of black letters following serial accidental death cases.
Unlimited copies are opened one after another: Echo Office Building, Yi Nian Apartment, Ancient Video Store, Core of Obsession...
When everyone thought that they could return to reality after clearing the customs, Jiang Yan came across the cruel truth - returning home was a lie woven by obsession.
Should he become the food of a cage, should he stick to the law of sacrifice, or should he join hands with all survivors to smash this world built by human regrets?
The rules of the battle of wits and the game of human nature.
In this game without a winner, Jiang Yan has to find a third way out.
Purpose: This book uses a copy of the rules constructed by obsession as a carrier to explore how people can live with the guilt and regret in their hearts. Comparing the utilitarian survival rules in desperate situations, it advocates the value of empathy and collaboration, and explains that the real breaking out of the cage is to break free from one's own inner prison and face regrets instead of escaping.
