Questions about the film Source Code

Sean was injured in the battle in Afghanistan and can be said to be dead. Because his body is only half, he is kept alive by scientific instruments, and only his brain is still alive and thinking. Therefore, his semi-disabled body and complete thinking are used to realize the "source code", which is what the movie said, and let a person's thinking invade the memory of the deceased through some scientific means. Go back to this person's life ... But Goodwin and others (people in the lab) think that the source code is not time travel or time travel, but virtual, just some pieces of information, just things in thinking and brain memory, but they are wrong. The source code is not what they imagined, and they have never entered the source code, but the protagonist Sean has entered the source code many times. In fact, every time you enter the "source code", there are many uncertain evolutions. All people and things are the same as reality, because the development of the real world is also an uncertain evolution, which is why the protagonist will have different results after every 8 minutes of reset. If such a complicated and changeable evolution cannot be realized only through the information of thinking and memory, the protagonist will definitely rescue the people on the train, because these are not thinking and memory. But it does exist (in fact, many details of the film also show that the "source code" world is actually related to the real world, and they are two parallel worlds), so the ending is just as the protagonist thinks, he has the "source code" world alive, and his thinking is inherited into the history teacher's body (the teacher's name has been forgotten), which is why Sean, the protagonist at the beginning of the film, looks in the mirror and finds that it is not his own. Your question is also well explained. Sean's half body has been lying in the laboratory. The living protagonist in the Source Code is actually a history teacher, but thinking is Sean's thinking! The world of the Source Code is parallel to the real world, so at the end of the movie, all the train passengers survived. Sean's thinking is completely parasitic on the history teacher. He sent a short message to Goodwin as a history teacher. When Goodwin received the text message, he was surprised and seemed to understand something. She understood that the "source code" is not a simple thinking information, but a more magical and huge new world, so Sean was "reborn"!