The Day the Sun Turned Cold (1994)

Young man Guan Jian (Tsung-Hua Tou) comes to a city police station and says that his mother murdered his father in their native village ten years ago. When a police captain asks why it took so long to report the crime, Guan says that he simply didn't have enough evidence then, but now he can prove that his father died of poisoning. Finally, Guan's persistence makes the sceptical captain launch the investigation that may reveal the truth.