So basically Light sold half of his lifespan for shinigami eyes and they wrote a story(death note)<<Lol basically. But I just read a book about a girl who can see people's death dates but never mentioned seeing her own.
I have this idea in my head. So, say everyone really does have soulmates. And if your soulmate dies before you meet them, they become kind of your “guardian angel.” Like, they want you to live a really long great life, so they take care of you and protect