Who Regressed the Timekeeper?

My mother gave this to me… She said to give it to someone special. Second Prince Noah said, his face flushing. Amy swallowed as she looked at the jewel resting on her palm. ‘You’re giving this to me again.’ She believed this jewel from her past life was what enabled her to return. “You’ve treasured it, and you’re giving it to me?” Noah blinked, then smiled brightly. “The only person special to me is Amy.” At those words, resembling a shy confession, Amy’s face crumbled. “Ah, that’s a bit.” After being devotedly loyal to a prince who loved her only to face betrayal and a tragic death, Amy returns. Burning with revenge, she attaches herself to Second Prince Noah, the antithesis of the crown prince, raising and educating him as a faithful steward. But then… it’s revealed that Amy had three magical artifacts at the time of her return. Who gave her the artifact that brought her back? “Amy, like this?” “Yes.” “Amy, I’ve become a Swordmaster!” “Already? You’ve just come of age!” Amy feels dizzy at Noah’s frighteningly rapid progress. But there’s such a thing as too much speed… Upon reaching adulthood, Noah rushes to her and kneels. “I’ve done everything you wanted. So now we get married, right?” “What?” Amy’s life was supposed to be a tale of revenge, but it’s turned into a romance novel!