The space-time view in the movie believes that the past and the future are intertwined, the present can affect the future, and the future can also affect the present. No matter where and when you come from, you can choose. Of course, the parallel world can also make sense. Anyway, the current theoretical physics is similar to nonsense.
The rest is the plot of the gangster movie, which is nothing more than saying that impulse is the devil, murder is wrong, and when is the time for retribution, only love and self-redemption (sacrifice?) are the way out.
If you understand this concept of time and space, you will find that its logic is precise and memorable.
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