Whose Memory Is She In?

Lin Zhou repaired the memories of others, but could not find his missing sister. Until the client Zhou Yao walked into the underground clinic. He discovered his sister Lin Wu's voiceprint in her memory of the accident. Why does Zhou Yao remember her? Is that sound a clue to reunion, or another carefully created illusion? Following the abnormal memory, Lin Zhou walked into the fourth extra station on the suspended line and found the split accident compensation list. He also discovered that there were three conflicting versions of his childhood. Later, more people in the city began to have the same dream, and a key deletion record pointed to his own account. The more he wants to get his sister back, the harder it becomes to trust himself in his mind. When memories can be repaired, borrowed and rewritten, to whom does the echo left by a person belong?