In the future city "Mirror City" where memories can be edited and erased, Shen Ye, a top memory weaver, repairs or deletes painful pasts for clients all day long, but is unable to piece together the truth about the death of his lover Lin Xi. A bizarre case in which he was asked to verify the memory of a technology giant unexpectedly opened a forbidden door to the past like a key. When a strange melody in the client's memory resonates with Lin Xi's relics, Shen Ye realizes that he is being drawn into a huge maze of lies, power and humanity. In order to pursue the truth in the echoes, he must dive into the most dangerous abyss of memory and face the crime and punishment game that can subvert the entire Mirror City.
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