In fact, at the same time, there were thousands or even tens of thousands of parallel worlds, and they were in a state of balance bound by time and space. But suddenly one day, this balance was broken for no reason, and I started to experience some strange things, such as seeing another myself, or repeating this day, or watching a friend die in front of me one second, but still chatting and laughing with him the next second.
Concept: Does parallel world exist?