There is an "Echo Pawn Shop" hidden deep in the old alleys of Nancheng. It is rumored that it can realize any wish, but the price is not money - but "return of Echo", which is the most precious memory or emotion in the pawn's life (such as "empathy", "childhood warmth", "trust in someone").
Shen Yan, an ordinary bookstore clerk, went into the pawn shop with her last hope to find her sister Shen Xi, who had been missing for half a year, and made a wish to "find clues to her sister." The price he paid was "empathy". From then on, he could no longer feel the pain of others, and only his cold reason remained.
As clues emerged, Shen Yan discovered that his sister's disappearance was related to the "Nancheng Experimental Accident" ten years ago. The reporter Wen Zhixia who was pursuing the case was also secretly investigating the pawn shop. The two went from testing each other to temporarily cooperating. Shen Yan solved multiple puzzles with her "no empathy" calmness, while Wen Zhixia used her "Memory Recall Pen" (which can record details forgotten by others) to supplement clues.
But with every step closer to the truth, Shen Yan needs to make more wishes to the pawnshop: to obtain experimental data, he pawns his "trust in friends"; to escape pursuit, he pawns his "obsession for justice"; to protect Wen Zhixia (or to protect the clues in her hands), he even pawns "part of his own memory".
