In the future city-state "Glory" where "emotional harmony" is the highest criterion, the job of the elite "echo analyst" Lin Mo is to sneak into the last memory of the deceased - "echo", to find the truth about their death. When he was ordered to analyze a seemingly ordinary suicide case of a top designer, he discovered a blank space that had been artificially erased and the afterimage of a mysterious key. This tiny anomaly, like a pebble thrown into still water, drew him into a huge whirlpool of conspiracy. In order to pursue the truth about his mentor's death and the justice that was concealed, Lin Mo must listen to the forcibly suppressed silent echoes from the depths of the city-state amid pervasive surveillance and carefully crafted lies.
