Background: 1. There are parallel worlds. 2. The world in which the story takes place and no actions change the future. That is to say, the story happened as shown in the photo. 3. There is an initial loophole. (The world 1 and world 3 mentioned later are uncertain, which is equivalent to world x and world y, and the story takes place in world 2, which is definite)
Overview plot: The doctor invented a machine that can predict the future camera, and then point the camera at the living room of the three protagonists to conduct the experiment. Later, the doctor adjusted the time predicted by the camera to a week later, and took the picture with blood, the doctor's hat, and a picture with an instrument. The doctor felt a bad premonition, and then wanted to do something to the machine. Modifications and the like, so I encountered an accidental death in the process of going down to the basement. The heroine found a reminder photo for herself when she first went in. Later, she went in with the two male protagonists and found the photo at 8 o'clock in the evening, so she knew that the camera would produce photos at 8 o'clock during the day and 8 o'clock in the evening, but Hiding the two male protagonists from letting them know. At the beginning, the two male protagonists thought that the camera was showing fate (because the death of the doctor made them think they would die if they didn't follow the time), that is to say, if they didn't follow the camera, they would die, so they kept looking for the instructions on the photo, So in line with what the photos show, this process has not changed the future. Later, through the doctor's friend, he learned that the doctor's death was an accident. The first male believes that the future can be changed, but the second male still believes in fate, so he goes crazy. In the end, the heroine also wanted to change the truth because the male protagonist discovered the truth. As long as she reminded her past self on the glass not to be discovered, the male protagonist would forget about it the next day, and everything was as good as before. In fact, it is not possible, as will be explained below.
Why do you say there are parallel worlds? Because the heroine received future reminders, those reminders are that the hero in World 1 summarizes the deficiencies that happened the day before and reminds the heroine in World 2 (that is, the world where the story takes place) to make corrections. During this period, the heroine of World 2 has been I'm looking for something to do, so it doesn't change the future predicted by the photos in World 2, but what has happened in World 1. So you can think about it the other way around, if there is no parallel world, the heroine herself would not be able to remind herself at all, because things didn't happen, so it couldn't be said to be corrected. It can also be understood that world 1 is one day faster in time and space than world 2 (for understanding purposes only, don't go into details on this point). Later, after the heroine killed the hero, she thought that she could change what happened tomorrow in World 2 by sticking a reminder on the glass, and the hero would not die. In fact, this was the delusion of the heroine, even if she did If it succeeds, it can only remind the self in World 3 (understood as one day later than World 2) to change the future in it. So, the heroine is crazy and delusional.
Why does World 2 not change the future? Because everything happened according to the photos, and there was no inconsistency. So in the context of this movie, we have no way of knowing what will happen if we change the future, which means we don't know if the photos taken before will change after changing the future. Here you can leave the background of the movie to make a hypothesis, change the future, what will happen? The result of this assumption is uncertain. Just like Schrödinger's cat, you can't tell if the cat inside is dead or alive without opening the box. In other words, if the protagonists don't look at the pictures one day, their futures are also unknown.
What exactly is the vulnerability? It is the first photo that the heroine found for the first time. It says 1. Push down the hanger and 2. Don't let others know that there will be photos during the day. The second point is that there is no loophole, because of selfishness, I want to open a plug-in for myself to change the future and obtain better results. The loophole is in the first point, why does the heroine of World 1 remind herself to knock down the hanger? To be clear, remind yourself that something bad happened in world 1. For example, by killing the second male to save the first male, it means that the second male killed the first male in World 1, so he reminds himself to kill him. The second male was saved to save the first male. So the question is, why remind yourself to knock down the hanger? It can be imagined that the hanger that happened in World 1 fell down as an accident. Then, the accident will happen, there is no need to remind, and there will be no reminder, so the reminder will not appear in the photo, but in fact there is this reminder, then Why? If the clothes hanger fell down on purpose, what was the purpose? After the hanger falls, the male protagonists will believe in the authenticity of the camera, that is to say, two results can be assumed. If the female protagonist does not deliberately knock it down, then they will not believe that the camera can predict the future, then there will be no follow-up. The photo doesn't exist anymore; if the heroine is knocked down on purpose, it means that there is another prompt reminding the heroine in World 1 to knock down the hanger, which will keep falling into a loop. After all, who is the heroine who originally issued this prompt? For what purpose do you remind the past (the past in another world) to knock down the hanger yourself?
The answer is that there is no reason, this is the biggest bug.
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