In the future, memories can be precisely removed. "Memory Purifier" Lin Mo is a leader in the industry. He calmly sneaks into the consciousness of his clients, erases the source of their pain, and treats memories as a set of data to be processed. However, during a routine mission, a memory about a rainy night and a broken music box from a strange female client stubbornly resisted his removal. What's even weirder is that the incomplete melody actually caused echoes in his own dusty past. In order to explore the truth, Lin Mo embarks on a dangerous journey against the current. What he will face is not only the company's dragnet, but also a cruel and sad self that he has forgotten by his own hands.
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