Exactly, the possibility of him living rises exponentially! If you act the same, you know they’ll die. But, if you don’t then there is still the possibility of them living. Plus, it doesn’t matter if he dies early or If he dies the same way as in the past, the FL will feel that she’s the reason either way. At least if he dies differently then she still got those memories together and got to make him a little bit happier, and she’ll know that at least she tried.
Yes! There's a lot possibilities so observing and waiting for the same thing to happen is just a waste and it's more traumatic if u just watch it happen again knowing that u can do something to avoid it.
I think that the blind date guy has another reason why he keeps on telling Hayoung not to change the past. Tho he actually has a point when he told Hayoung that changing the past will deeply affect the future. BUT If I was in Hayoung's place I think I'll do the same bcos how can u not do anything knowing what will happen and if it might save the one you love why not try to do something.