In Micheng, where the "tide of forgetting" periodically sweeps across, memory has become the most expensive luxury. Gu Chuan, the top "memory diver", makes a living by sneaking into other people's broken consciousness and salvaging memory fragments. Calm and professional, he treats memories as editable data, until he takes on a strange commission - to retrieve a forgotten lullaby. When he dived into the deep sea of consciousness of his client Lin Ruo, he accidentally salvaged a piece of his own, buried past. The melody that shakes the fate of the two people will lead him to an isolated island called "Truth", surrounded by a sea of oblivion that can swallow everything. He must decide whether to continue to be a ferryman who stays out of the situation, or to risk being completely submerged and find his true self.
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