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Apparently Cosette (?) had powers only because she was temporarily absorbing Keira powers, but after Keira died the truth was revealed: Cosette couldn't absorb powers anymore because the real daughter wasn't there anymore, people discovered that Cosette was actually the fake, but it was too late! The world fell into chaos and everybody regretted killing Keira (mind you, some people believed that Keira was the real daughter, like the knights and her brother!).
From what I see the man that turned time wasn't her father: dad's eyes are red while the one who turned time had blue eyes.
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I read that the magic to turn back time requires 2 people. Magician Shore and the Duke performed this magic. Also Cosette is really his daughter or atleast her body. Her mom, the duke's 1st wife, made a contract with a demon to save her daughter in exchange of her soul but the baby girl was stillborn but the devil stilled possessed her body.
But I also read somewhere that the 1st wife's baby was a boy or twins... But the fist one is most likely it. Hahahah.
Ah, and the Duke was left alone. MC and her brother cut ties with him.
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Actually, he knew that Keira was his real daughter. He didn’t « discovered » it like everyone else. He already knew it, yet killed her, because he wanted to stay neutral and for him, not killing Keira would make him look as if he let his feelings biasing his choices. (╬ ̄皿 ̄)凸
I did a hella big spoil a few days ago, if you want to check it out.
Ikr idk how dumb he can be
But actually, I don’t know if he knew she was the saintess (⊙…⊙ )
I think he may have thought that Cosette was the saintess, and that Keira was not ? What’s for sure is that he knew that Keira was his child. Maybe he thought Cosette was his child (big spoil : she really is tho) which means he killed Keira as his daughter, not her as a saintess
But we’re talking about the dad rn, not if she really was
Of course she was since she’s the MC but the thing is like, I’m saying that idk if the dad knew it.
And for Cosette it’s not like that ; it’s her magic as a Demon. Keira actually had the spirits, not Cosette. She was just too shocked to see the magic of Cosette to realize that SHE had the spirits and not Cosette, and then awoke her powers

What actually happened after Keira died? Was that woman ever revealed to be a fake? The one who reverted the time back seemed to be the duke? Did he have regrets? Pleasee give me spoilers.