In fact, it doesn’t affect at all in this movie, because every time the watch travels through time, it will follow the person who bound it, that is, there will be only one watch in the same time and space. The watch for the experiment was gone, instead it appeared in the hands of the male protagonist who was still a baby.
In addition, with regard to the preservation of memories after crossing, anyone who touches the watch during crossing will have memories, which have been shown in the plot.
Finally, based on the fact that the male protagonist turned into a baby twenty-six years ago, it is guessed that the travel time cannot exceed his birth point, which is the time before the birth of the watch user. It is impossible for the watch user to go. There is no grandmother paradox anymore.
Second, parallel time and space, parallel timelines, or not the original world, etc.
For this show, it is not important. For the watch user himself and the person who touches the watch during the travel, the memory after the travel is complete, enough to ensure that he is still himself.
What kind of quantum transmission, the body is reorganized, cloned again, another person in time and space is still there, for the traveler himself, there is no change, because there is no way to prove that he is not himself, and the watch will follow the host to travel. The people around only retain this time and previous memories. Except for the watch user and the people who touched it when passing through, this time and space is the time and space to come, so from the setting point of view, this point in the movie It is completely self-consistent.
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