What Charles changed was John in the past (while his daughter was alive, or even earlier), causing John to euthanize his daughter and inherit Charles' business. (before meeting Charles)
The last line "see you soon John" is the voice in John's head, meaning they haven't met when John hears it. I guess John's timeline at this point is before killing his daughter, John saw what happened in the future (that is, in the movie), and at the end he was influenced by Charles (killed Charles) and euthanized his daughter.
Then, he inherited the philosophy of Charles, painlessly killing many terminally ill patients. About 1 hour 11-13 minutes into the movie, the female police officer investigates similar cases. There were 62 cases in the country in 10 years. The characteristic is that there was no stab wound to the brain, but they were all painless killings, poisonous killing, and carbon monoxide. Because John is a doctor, these poisonings are more like John's (too old to stab the back of the head).
Of course, there seems to be a big loophole in this theory - if John hadn't killed his daughter, then he wouldn't see the future as in the movie (the Butterfly Effect), which in turn would not have led John to want to kill his daughter.
Because the game I'm working on has a similar plot, I want to "quibble" (explain). This loophole is [based on our ordinary people's cognition], that is, the present determines the future. However, we don't know what the world looks like in the eyes of "people who can see the future", [is the flow of time for them positive or negative or zero]?
I think the past, present and future in their eyes are happening at the same time.
Charles had told John on the train that they had been watching it, day after day, year after year.
This is confirmed by what Elizabeth (John's ex-wife) says at the end, when she says that John's letter is different this time, "it's all about the past", but [John doesn't realize this]. That is to say, John has written letters before, more or less about the future, because for John, he may not be able to distinguish the past, the future and the present.
In my game settings, characters like John have different perceptions of time. For them, the future and the present are happening at the same time, and the causal relationship is no longer the past that determines the future, but the future that determines the past. (because for them it [is simultaneous])
If we must try to understand their time flow from our perspective, I think "recall" is the best word to use. That is, their life is over, what has happened will not change, they are just reminiscing about those things that have happened, in no specific chronological order.
(Assuming) for John the past, present, and future are simultaneous, then the statement that [Charles changed John of the past] makes sense.
The interesting thing is that John finally saved the policewoman and left a scar on his left forehead. This scar is almost identical to the one on Charles' left forehead, which made me think that Charles and John are the same person. Now that I think about it, maybe Charles went through something similar.
After all, it is a brain hole, just watch and play.
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