I Did Nothing Wrong, Prince

Hildegard Rosette grew up engaged to the second prince of Kasia, Damien Astor. She has been in love with him since she was a young girl, but then he never returned her feelings. Still, for several years she remained ignorant, until the night before her wedding.
The entire royal family was killed, and Damien was the only one left standing.
He accused her, his own fiance of committing treason, and sentenced her to death, all with a large smile on his face. As Hildy sat exposed to have her head cut off, the only thing she felt was regret for ever having loved such a cold and heartless person. So she wished she and never met him or grown to love him.
Then she wakes up in the bed of her youth, and when she looked in the mirror, she recognized herself to be ten years old. The age she had become betrothed to the wicked second prince. Now Hildy is going to try everything in her power to be able to live past her eighteen and have a happily ever after.