In the near future, memories can be deleted with precision. Silence, a top "memory restorer", uses his calm and professional methods to erase the source of pain for clients and let them regain their lives. He regards memory as editable data and emotions as redundant variables. Until a woman named Lin Yuan appeared with a seemingly trivial request: to delete a memory about a blue butterfly. When the silence sneaked into the depths of her brain, she found that the butterfly's wings were flapping her own long-forgotten past. Every "repair" drags him toward an abyss called truth, built by the two of them. He must find his forgotten self in the ruins of professional ethics and personal emotions.
