In the end, I don't know if it was the young student who killed him. The whole film is the subjective speculation and fantasy of the lawyer and the professor. He said that the young students were arrogant and self-righteous, but what if he was not. He was self-righteous and went to investigate in the direction he believed in himself, and finally ruined his future. In fact, sometimes I believe that I am not wrong, but as a lawyer, I cannot lose the ability to consider from multiple perspectives. But maybe it was the young student who killed him. He was playing games with the professor, who knows?
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