In the future, humans can peel off and store traumatic memories through deep-sea archive technology in exchange for surface peace. Ling Chen, the top memory organizer, is known for his calmness and precision, and regards memory as an inorganic data flow. However, his perfect world begins to crumble when he receives an encrypted file from Patient Zero. This fragment of fragmented and chaotic memory, which contained great sorrow, not only could not be archived by the system, but also triggered an inexplicable echo in his mind. In order to explore the truth, Ling Chen sneaked into the forbidden area of memory step by step, only to find that the prisoner on this isolated island was himself who had been forgotten by his own hands. When the dam of the Sea of Oblivion bursts, the seemingly perfect life of him and his wife will be completely submerged by the cruel truth.