Three years ago, Wen Lin personally sent the key witness to the witness protection program, thinking that was the end of justice. Three years later, the witness stood in the dock as a murder suspect, and the prosecutor in charge of the case was Shen Jin, who had parted ways with him back then. The chain of evidence was perfect, and the witness insisted that he was innocent, but an unquenchable doubt arose in Wen Lin's heart - had the testimony he personally handed over been tampered with? When the law and memory are torn apart, he must choose between silence and investigation whether to work side by side with Shen Jin again to uncover the buried truth.