In the near future where technology can accurately erase specific memories, Lin Mo is a top "memory cleaner." He is calm and professional and can peel away any painful past for his clients, but his own past is a bottomless blank. When a woman named Su Qing came for help with a broken memory of a car accident, Lin Mo found a yellow butterfly hairpin deep in her memory that did not belong to her but was extremely familiar. This tiny object was like a key, prying open his dusty island of memory. In order to explore the truth, he broke all his principles and became entangled with the fate of his clients, only to find that their shared resonance was far heavier and sadder than he imagined.
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