In the "floating city" where memories can be extracted, stored and traded, Lin Mo, the top "sound memory master", can sniff out the truth from the most broken memory fragments. He has recovered the forgotten past for countless clients, but he can only find the blank key memory of himself. A mysterious commission breaks his peaceful life - to find a completely forgotten melody. When he went deep into the fog of data and emotion, he was horrified to find that the end point of the melody pointed to the cause of his own island of memory, and the dark secret beneath the city's glamorous appearance that could subvert everything.
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