In a future city where technology can accurately remove human memories, Lin Zhou is a top "memory submariner" who makes a living by sneaking into other people's consciousness and erasing pain. He is calm and professional, like a "soul scavenger" with no past. However, a seemingly simple commission - to erase a specific hour in the life of a powerful client - drags him into a huge whirlpool. Deep in the client's broken memories, Lin Zhou accidentally discovered a "Crimson Dahlia" emblem related to his sister who had been missing for many years. When professional boundaries are breached by personal emotions, he must navigate between clients' lies, the company's surveillance, and his own blurred past to find the island of truth in this ocean of oblivion.
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