People can only live in the present.
Time is the measure of the movement of matter.
The movement of matter is recorded in the brain one after another due to the observation and memory of consciousness.
However, no matter how matter moves, what remains unchanged is matter, but what changes is its light and shadow, coordinates, and structure.
The state of "consciousness facing matter" is now. At the time point of "now", in addition to the matter facing, there are only memories in the brain, and light and shadows that spread at the speed of light. If you can catch up with the light, you can indeed see the image of you in the past, but only the image. If you can recall, you can indeed recall the image of you in the past, and it is just an image.
Both the past and the future have no material entities, they only exist in the memory and imagination of the brain. Only the present and the present have material entities.
Therefore, the male protagonist cannot go back to the past, nor can he reach the future, because there is nothing in the past and nothing in the future, let alone changing the past. People can and can only be in the present, which is the present moment.
If you can enter the time machine, you can indeed reach a certain point in time in the future, but it is still your present, and you can refer to this "present" as the present in your memory and give it the name "future". So you are in the future.
In the film, in addition to the nonsense and impossible event of the male protagonist returning to the past, the shuttle to the future and the speed change of material motion are very consistent with the characteristics of material motion.
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