Former criminal defense lawyer Chen Jin had his license revoked due to an unjust case and worked anonymously as a night-shift taxi driver. He was charged with murder and played a corruption tape of Judge Zhou Hongyuan in court, revealing the interest network behind the judicial system. The new prosecutor Shen Zhiwei took over the case. From the initial identification of him as a cold-blooded murderer to the discovery of contradictory evidence, he gradually became the only person who could work with him to stir up darkness. Zhou Hongyuan set up a trap to silence him, and Chen Jin had complete recording evidence, but faced Lu Yanzhou's betrayal, Jiang Xue's coma, and Zhao Tiezhu's surveillance. The secrets in the recordings, hard drives, and children's watches connected the Lin Yuan case three years ago, and the truth gradually emerged in the rainy night.