Remember movie plot

An old man Zev Guttman ( Christopher Plummer ) suffering from Alzheimer’s disease has forgotten more and more things over time. However, the vengeance of his family members killed by the Nazis in Auschwitz during World War II has become more and more in his heart. Lai Yueqiang, after the death of his wife, he began to track down a Nazi prison officer named Otto Wallisch in Auschwitz with the help of his friend Max ( Martin Landau ) in the same nursing home . The prison officer changed his name to Rudy Kurlander, disguised as a Auschwitz survivor and fled to Canada. When he found the fourth Rudy Kurlander, Zev remembered that he was Otto Wallisch. The fourth Rudy Kurlander was his original comrade in arms. After the comrades told him, Zev remembered that after the war, in order to escape punishment, the two tattooed each other to escape punishment. The old man had forgotten his name and the past. Then the old man killed his comrades in arms. Before committing suicide, he said "I Remember." (He did not forget his identity and name), and then committed suicide.