Wei Junlan, who retired from the Municipal Food and Drug Administration, was suddenly murdered, and her tragic death at home shocked the whole city. On the surface, her husband, Qin Yaxuan, was heartbroken, but it was discovered that he had long been separated from his wife, and that he had been in close contact with a young and beautiful single woman, Wu Tong. However, the absence of the two also prevented the police from concluding that love was the motive. When the case was at a loss, drug dealer who once had a feud with Wei Junlan, became a new target of suspects.