In Xinhai City, where technology can accurately erase memories, Lin Mo is a top "memory purifier". He is calm and professional, and regards memory as editable data, until the arrival of a mysterious woman Su Qing. She asked to erase a memory about the "Silver Butterfly", and Lin Mo actually saw her forgotten past during the operation. This little butterfly, like a key, opened his dusty island of memory. In order to explore the truth, Lin Mo embarked on a dangerous journey upstream and against the entire memory industry giant. He will discover that the deepest forgetfulness is to cover up the cruelest truth; and what he wants to retrieve the most may be the one that deserves to be buried.
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