In 1940, Chen Yanzhi is imprisoned at Unit 731 and witnesses his fellow countrymen being tortured. He joins forces with Zhao Laogen and Lin Xiuya, who share his conscience, and secretly plans a breakout with prisoners who have useful skills. After enduring countless hardships, they break through layer after layer of lockdown and flee to the Soviet Union with evidence of the experiments, exposing the truth. After the war, they testify in court, using their firsthand experiences to preserve the memory of history and defend justice.
