No one cares about the real Sanyu, people only care about expressing themselves by judging Sanyu.
Sanyu's sense of powerlessness towards fate stems from the death of his parents and wife. The first time he killed, perhaps it was for the pleasure of deciding people's life and death. However, the police determined that he murdered because the gang was rampant, and the judge determined that his murder was due to social problems, not because of him. Sanyu, whose sentence has been commuted, is destined to be disappointed: he can't control how fate judges himself, and he can't help himself, so what's the point of living?
Then it's a meaningless existence, and let others decide who Misumi is.
After being released on parole, he sent a postcard of gratitude. Sanyu was the person who was rehabilitated by the judge; he dumped garbage and paid the rent in a regular manner. Sanyu was a model tenant that the landlord hoped; Dead father; collecting black money and concealing fraud, Misumi is the accomplice of the employer and the couple's hope; playing and talking in the snow, Misumi is the relative that Sakie has; killing Sakue's biological father, Misumi is Sakue's father-killing murderer. Even in the end, after rewriting the confession and denying the crime, Sanyu was the father that lawyer Shigesheng hoped to sacrifice himself for his daughter.
The three corners are containers that hold other people's desires. When other people's desires are fulfilled, when the container is empty, he will die.
Does Misumi's real motive for murder matter? The lawyer believes that it is not important, and the important thing is to have a fatherly spirit of devotion to life. Prosecutors determined that it was not important, but that "let the prisoner face up to his crime". The judge determined that it was not important and that the important thing was that the trial should not be delayed. Does Sakie decide it's important? It's not important either, the important thing is to act for the sky.
The canary released by Sanyu is probably his motive: to escape from the control of others, my life is up to me.
But in this vain life, life cannot be controlled by people, and only ends in death.
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