"Darkness" is a good drama, the main story is very precise, and it interprets the beauty of scientific principles.
But the science before the last episode was based on determinism, and in the last episode it went against itself.
Known: The grandfather paradox, or the chain of causation on a certain timeline must be closed. (The main body of the plot is describing this principle)
At the same time: the "cause" of the originating world has obtained the "effect" of dividing the world
Hence: events in the causal chain of J and M that are not destined to "annihilate" the "cause" of their own existence.
Conversely: if the already existing effects of J and M are destined to eliminate their own causes, then: neither the cause nor the effect will exist from the very beginning, that is to say, the entire main story itself does not exist.
The bug is that the pair does disappear in the end, but actually has an effect on the origin world, which creates a causal relationship (against the grandfather paradox), but it's not a new parallel world, and at the same time they disappear (in line with the grandfather paradox).
Although the grandfather's paradox was violated in order to testify to free will in the end, a play called "Darkness" should give people bright hope.
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