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Guspaz: Oh it's very much certain that she's the fated person.
The question is, is the conscious Reene the fated one, or the dream 'Reene'?
See, these sort of fated person reuniting tend to forget one thing: The 'new' fated person might not so happily accept her situation.
Especially given how these dream have been slowly making her care about this man she's met for the first time.
Is this feeling hers for real? Or is 'someone else' slowly affecting her?
Has there been any other things in her life that's been changed in similar way?
What will become of her at the end? Will the fated person persona overwrite her own, reducing "Reene" into nothing?
It's very much primed for some existential crisis moment if the author want to push it.
Like, say, the guy finally realized she's the fated one, and overlap the past fated person, the one he was in love with long ago.
Then he call her by that name.
Which causes her to snap back "I AM NOT HER!" then basically shout out her own personal history, the pent up feelings about being dragged into this world and the troubles she ran into.
Then she run off to mope about her own existence.
While the guy get some time to contemplate this, then eventually decide the current Reene is fine too.