First of all, that woman is not his mother, but her grandmother. My uncle's son was killed by a suspect who was tortured by him. The suspect thinks he is a good man because this man used beef to help him get rid of blood stasis. But he didn't help him under torture, so he resented him and no longer trusted the priest. Later, he retaliated against that man, retaliated against that uncle, and did not retaliate against another criminal policeman who was more vicious than him, indicating that hopeless hope is the saddest thing in the world. He had hope for that man, but that man didn't lend a helping hand. Killed my uncle's son and committed suicide, so there were two bodies lying there. As for why that boy killed his grandmother, because he is a pervert and believes in God and has the idea of eternal life, I am joking. In fact, the boy has psychological problems. He thinks women are dirty. Uncle once went to his house and had a cup of coffee, but he misinterpreted it as having an affair with his grandmother. If he can't guide this kind of thing correctly, he is easily influenced by evil and produces some ideas that he thinks are reasonable but actually nonsense! I just watched this movie, and then I saw your question. I hope you can understand \ (o)/~