In the future city "Xinhai City", memories can be stripped away, stored, and even forgotten. Ling Su, the top "memory submariner", makes a living by sneaking into the "Sea of Oblivion", a stream of memory data abandoned by humans. He is calm and distant, just looking for his lost memory fragments. A mysterious commission broke his peace. The elegant and dangerous woman Shu Wan asked him to salvage an encrypted memory belonging to her missing father. When Ling Su dived into the turbulent abyss of data, he discovered that this memory was not only the key to unlocking a huge conspiracy, but was also closely connected to his own dust-laden past. At the boundary between truth and falsehood, he must decide whether to continue forgetting or risk his life to embrace the truth that can swallow him completely.