Every city has its hidden cracks.
A convenience store at three in the morning, an elevator that never stops on the seventeenth floor, a bus stop that only appears when it rains.
People pass by them countless times without ever noticing, until Jiang Yuan hears a rule that shouldn't exist.
Three rules are written on the wall. Everyone else can only see their surface, but he can hear the echoes: faint whispers, as if coming through a wall, telling him what's hidden behind the rules.
The echo says: Rules aren't just rules. They're puzzles, too.
His name is Jiang Yuan, and he can hear the hidden rules.
