Man Behind the Sun

"Man Behind the Sun" is a 1988 Hong Kong historical horror film directed by Mou Tun-fei, which graphically depicts the war atrocities committed by the Empire of Japan at Unit 731, the secret biological weapons experimentation unit of the Imperial Japanese Army during the Second Sino-Japanese War. The film follows the story of Japanese boys conscripted into the Youth Corps and their subsequent introduction to the gruesome experiments conducted at Unit 731, where Chinese prisoners of war are subjected to horrific torture and medical tests. With its graphic depiction of biological warfare and mass murder, the film was the first to be classified "level III" in Hong Kong, equivalent to the US rating NC-17.