Light in Dark Places

Joan Kaas wakes up seven years after Misery took her. No one can explain why. No one has ever woken up from Misery before. She learns that while she slept, her older sister Seung-ri overthrew a corrupt regime and is now a King, possessing a rare Prodigy-Class Ash talent, all to protect Joan while she slept. Joan doesn't know why she woke up, why she knows things she never learned before Misery took her, what her Ash talent is, or whether or not she's her sister's happy ending or her sister's tragedy.
But she knows Seung-ri has a lot of enemies.

And those enemies all know that if you want to hurt Seung-ri Kaas, you go after her sister.