Yay! Choi got his good ending.
...Wait what about all the people he possessed? Are they going to go on with their lives as if he wasn't part of them now?
@TheIndicator I don't think she did it with good intentions, I think it was more or less that he never understood the weight that death had on people. He, by his way of thinking, was diminishing her role in the universe and that irritated her. So via all the lives he lived, she taught him that death does matter. He lived in other people's lives and not only died and saw how his death affected people, he learned how it was to be affected by death, and then at the end what it's like to have a loved family member die (hence why death put him in his mother's body, because she was 'dead' with him inside).
All of it was a way to push the fact that she, as death, is one of the weightiest and most powerful forces in existence. Once he learned that lesson, she had no reason to be angry with him anymore so she forgave him, gave him what he wanted and let him go. Though she still did it in a way that screwed with him, she likely knew exactly which bullet was in the chamber. Yes, this whole thing was an ego-trip for Death, but not a hostile one.
I think it was more or less like when you talked back to your parents. They're upset you did it (maybe even furious depending on what you said), and they want to teach you a lesson, but they don't exactly hate you for it. They just want you to learn respect.