In Xinhai City, sounds of all intensity are taboo, ruthlessly enforced by the mysterious "Echo Guardians". Memory extractor Lin Mo, a man accustomed to salvaging the past in silence, accepted an impossible commission: to retrieve a forgotten taboo song from the memory of a dying old man. This dangerous memory voyage not only made him the number one public enemy in the city, but also revealed the shocking secrets about human nature, freedom and memory behind this silent city.
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