There are not many dialogues between the killer father and his son in the movie, but in the few sentences, we can all see full fatherly love. In order for his son to live a happy life, his father chose to stay away and silently pay attention to his son. In order to save his son's life, he went back to his old business and killed his old friend Sean (this was also a big decision, when Jimmy chose Sean and killed his cousin).
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