What I can say is that the fierce truth is borne by the current world line, that is, the only world line where no one will die, so it is rejected by the world line, so the fierce truth disappears. If he disappears, the memory of people on the world line will change, so everyone can't remember this person, but because they have been in contact with him for a long time, they only leave a little impression. In fact, this is very sad. Once he disappears, no one will remember him.
Later, Hong Liqi lived for a few days under the premise that the fierce truth did not exist. Later, she accidentally found the knife and fork that the truth gave her. Because knives and forks are real objects of this world line and will not disappear. At this moment, Hong Liqi remembered that she had forgotten someone who was very important to her. At this time, an immigrant soldier from the future appeared, told her the reason, and then said that if she wanted to find the truth, she must replace him as an observer. Only by going to the place where the forgotten world line is rejected by all the world lines can we find the fierce truth. If you have seen Shimen before, you will know that the fierce truth is to save the truth, while Liu Hua, Hong Liqi and others will know that observers can freely shuttle the world line, but the same price is to face the person they care about again and again and die in front of him, which will only bring despair and sadness to themselves. Therefore, Hong Liqi also made up her mind and found that she cared very much.
Therefore, Hong Liqi returned to the time when Meng was really small, which changed the history and made the world line where she is now recognized that Meng really exists.
Oh, that's about it, one by one, because I've been watching the theatrical version for some time, and I remember that's about it. The landlord can go to bilibi again, and the barrage inside is more detailed.