Movie Story : In a small Hubei town at the turn of the twentieth century, the death of a dart-throwing man named Qin Gang becomes a sensational homicide and robbery case. Detective Deng Ting and his assistant Song Feiyan are assigned to investigate, but the case seems closed when Chen Tianhe is arrested and confesses to the killing. Deng Ting remains unconvinced, and he sends Song Feiyan back to look for overlooked details. The investigation takes an unexpected turn, revealing that the roots of the crime stretch back to a wrongly decided case from ten years earlier.