Honestly, I see this a lot. But at least those characters have sympathy towards the OG character. I lowkey wish I could see a story where the OG finds happiness, when someone else takes their life.
I'm not sure it's exactly what you're looking for but you might try reading [ I Thought It Was a Common Isekai Story ] I don't want to spoil it for you, but the "shocking reveal" near the end was amazing and worth the wait.
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Listen I get the whole “change your destiny” type stuff but are we just gonna forget that the OG FL was robbed of a bright happy future??? Also if the ML only has eyes for the OG FL why the heck was he so easily snatched ?! Idk but I wanted everyone to be happy not just read about some selfish person going out of their way to take someone else’s happiness. If your happiness is built on stealing someone else’s happiness/destiny; what happens to the OG ? Do they not deserve to be happy after all that struggle and suffering? The original pink hair shirked their responsibilities onto the blue hair girl and also gave her the ML just cause she thinks she’s better - this story is frustrating