In the center of the Forgotten Sea, there is a memory archive codenamed "Forgotten Island". Shen Yu is the only archivist on the island. His job is to receive, process and seal painful memories from all over the world to bring peace to people. He takes absolute rationality and order as his creed, isolates himself from emotions, and sees himself as a scavenger of human suffering. However, the arrival of an abnormal memory file numbered 734 broke his orderly world. The memory was not painful, but filled with the promise of lighthouses, sea breezes and warmth. When Shen Yu was forced to immerse himself in it, he discovered that this memory was not only related to a girl named Lin tide, but more like a key, trying to unlock his own dusty and long-forgotten past. He must make a choice between duty and the truth, and this choice will determine whether he will continue to be a prisoner on the island, or jump into the sea of oblivion to find his lost self.
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