Saving My Crown Prince

Abby was reincarnated. This time, she swore to reform the villain of her previous life, changing the fate of the world ending… No, why should I be so hung up on this? Nice, gentle older brothers, a mysterious mage- Who is this decisive killer of a handsome man with so many accomplishments in war? It turns out to be the Crown Prince who had died young in his past life! Well, one way is to put him on the throne, but he’s destined to die in three years due to a curse!