Enchanted to be together

A girl who suffered a painful and lonely life in the real world dies and is reborn as Ellen, the younger sister of the male protagonist, Edrick, in her favorite fantasy novel. But there's a catch—Ellen knows how the story ends. In the original plot, her character and her father are killed by the villain, Damian, who falls into darkness after being betrayed. Determined to change her fate and protect those she cares about, Ellen sets out to stop Damian from becoming the villain. Along the way, she struggles with tangled relationships, all while hiding the truth that she doesn't belong to this world.