In the future city, Chen Mo, a top memory sorter, can accurately remove customers' painful memories and build a perfect life for them. He is calm, professional, and treats memories as editable data. However, during a routine operation, a broken crystal music box in the customer's memory actually triggered severe pain and blankness in the depths of his own mind. The past that was buried by his own hands and should have been completely forgotten began to turn into ghostly fragments, eroding his proud sanity. In order to retrieve the truth, Chen Mo had to sneak into his blocked "memory island" and salvage the truth that might swallow him completely in the dangerous sea called "forgetfulness".
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