When a wedding ring becomes a murder weapon, the truth is no longer the evidence of love, but the key to murder. Former detective Shen Li was accused of murdering his wife, and the only physical evidence was the ring that he never left. Forensic doctor Su Tang found that the metal residue exactly matched the ring, but saw traces of tampering in the inspection report. As the designer's anonymous drawings, the sister's secret diagnosis and treatment, and the black marketeer's intelligence chain were uncovered, they discovered that the murder was a carefully designed sacrifice - every couple who wore this wedding ring died on the anniversary. And Shen Li is the only person who has survived three years.
