I think the ending is well arranged like this. Originally he was a gangster, but he was fair enough. When he found out that Dan was also such a person, he completely agreed with Dan and was willing to be the footnote of Dan's true heroic deeds. At this time, the second child killed Dan, even though it was to save him, and although the second child had always been loyal to him, he could no longer accept this fact. At this time, the bloodthirsty in his bones became a demon again. Come out and kill all the brothers. I think Ben is a real gangster. He only sees what he thinks is right or wrong, so he can take the initiative to subdue the law, and he can kill the good brothers who share life and death. He's a bad guy, but righteous. In the end, this kind of contradiction in him was fully manifested. If he didn't kill the second child in the end or set the second child to be a heinous, ruthless villain, he would not be able to express this contradiction in himself. Just a good guy. Personally, I think this ending is more meaningful.
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