Unit 731 of the Japanese Army, stationed in Harbin during the Sino-Japanese War, secretly carried out its duties related to the biological warfare. From Jilin to Zhejiang and Jiangxi, they injected deadly bacteria into the bodies of civilians. In this film, Opening Closing Forgetting, the director accompanies a fact-finding survey of survivors in Zhejiang area, recording their testimony. Survivors who were shot bacterial injection at a young age of 10 have lived in silence for decades, suffering from the aftereffects. Now the survivors pass away one by one, and their memories are fading. On the other hand, the film also attempts interviews with some of the 731 unit soldiers who are alive. They, much older than the victims but still healthily alive, are turning a blind eye to their responsibilities by making secret pledges and avoiding their testimony or saying they were not involved. What should we do in front of the victim′s increasingly worsening wounds, the mouth of the huddled assailant, and the memory of all those who are gradually forgetting? Regrets deepen. (Huh Kyoung)