In the "Mirror City" where memory retrieval is used to convict people, Lin Feng, the top memory examiner, discovered an "echo" of memory that could not be ignored due to an official "perfect" trial. This weak distortion not only involves the truth about the death of AI ethicist Suman, but also drags him into the pain of losing his wife. When the "reality" constructed by technology is intertwined with the faint memories of human nature, Lin Feng must find a wandering path through crime and punishment for the dead and for himself among the iron walls and broken echoes of the system.
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