Three years ago, the murder of a female college student was solved, and the suspect Xu Hongguang committed suicide in a detention center. Three years later, the down-and-out lawyer Lu Zhengyan took over the defense case of a deceased person that no one wanted to touch at the wine table - just to prove the deceased's innocence. Partner forensic doctor Su Ran extracted skin tissue that did not belong to the prison guard from the cracks of Xu Hongguang's fingernails, while Lu Zhengyan played a deleted surveillance video on the spot in court. The real murderer surfaced from prosecutor Fang Jingxing, and Fang Jingxing's ex-wife Zheng Wanqing turned against him with key evidence. The court fell into dead silence, but a bigger black hand was strangled from the shadows at Lu Zhengyan's throat.
