In the beginning ① The 15-year-old fire sister died (didn't say how she died) - no murderer - travel back to save my sister sometime after 2004
②Travel back to the 15-year-old fire and rescued the younger sister from the window. Parents died - Rebecca, the first deceased in 1998 - Traverse back to find the truth of Rebecca's death (brother and sister began to travel together)
③In 2004, I talked to the murderer’s sister in the factory and then traveled through the door. When I was 15 years old, I blocked the door. I married Elizabeth and had a daughter. The murderer is gone. Everyone is alive.
It can be seen from ③ that it was himself who killed his sister in ①. Of course he didn't know it at first. It was probably a time paradox, but it happened, just like Rebecca wrote in her diary and said someone was following her.
The fire may have been set by the male protagonist. He looked at the destroyed device and seemed to know it well, or there might be other reasons, but if the male protagonist was not the arsonist, he could have gone back to the fire to stop the fire, because he Had to go back to a younger time for the police. In ①, the male protagonist does not know who the arsonist and the one who killed his sister are, and in ③, he had an epiphany when he blocked the door. In the movie, the adult Sam and the 15-year-old Sam appear alternately when the door is blocked. Maybe it means that he finally understands everything .
Regarding the ending, it is obviously not the beginning ①, the male protagonist is surprised because he has not seen this part, maybe the development of ① is that he and Rebecca are together, after the epiphany of ③ and the discovery of Rebecca cheating in ② , he will naturally skip Rebecca and be with Elizabeth, so he may have thought that the moment when he killed his sister, everything would go back ① but this part of Rebecca changed, causing him to have a daughter named Jenna.
But the male protagonist doesn't think there is anything wrong because he has never walked this line and doesn't know the future development.
The doll the little girl burned was exactly the same as her. It was guessed that either the little sister was possessed to show that she was burned to death and then reborn in the little girl's body, or she was simply reincarnated as a little girl. The little girl was wearing pink clothes when the accident happened. Now the little girl The blue she wears is a bit like the crayon in the little girl's hand in the "Black Floor" that was red at the beginning, and turned blue when she started again. The fact that the crayon turns blue in "Black Floor" means that it is reincarnation again, so I guess the ending is entering a reincarnation.
The reason why the little girl is laughing is probably because the male protagonist and Rebecca in the back are together and then there is this little girl named Jenna, she may have long known that this can't go out at all.
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