In a future where memories can be accurately removed, Lu Chen is the top "memory cleaner" in the industry. He is calm, efficient, and treats emotions as bugs that can be fixed. When a mysterious woman named Lin Ruoyu commissioned him to erase a memory about a "non-existent song", the "resonance cascade" triggered by the surgery unexpectedly shattered the barriers of Lu Chen's own memory. The deep-buried sadness and love that didn't belong to him came flooding back. In order to find the truth, Lu Chen embarked on a dangerous journey upstream, only to find that he was already a prisoner on this island of memory, surrounded by the sea of forgetfulness.
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