The film tells the story of the Japanese Army's Unit 731 in Harbin's Pingfang District on the eve of victory in the War of Resistance in 1945. Under the guise of "water supply and epidemic prevention," the unit carried out bacteriological warfare research and slaughtered civilians through human experimentation, exposing its crimes against humanity. Through the tragic ordeal of innocent civilians such as street vendor Wang Yongzhang—who were deceived, captured, imprisoned, and reduced to inhumane subjects of live experiments, the film depicts the suffering, awakening, and indomitable resistance of ordinary people in the torrent of war.