In the near future, human memories can be stripped and stored. Ling Zhou, a former elite agent whose future was ruined, chose to be the sole watchman of the "Island of Memory", filing the "Echoing Stones" sent day after day, numbly guarding the joys, sorrows and joys of countless strangers. He abides by the iron code of absolute neutrality until an anonymous echoing stone arrives. What emerges from the stone is a girl who is very similar to his dead sister, and a broken memory that points to a huge conspiracy. In order to pursue the truth, Ling Zhou broke taboos and embarked on a dangerous journey to confront his dusty past.
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