I Am The Villain Younger Sister

I am the deadly assassin in the 21st century yet I died because a chunk of apple stuck in my throat. What worse is I got reincarnated in a 19 r novel that my stupid subordinate read to me while we are running from the enemy! My brother, the main villain, is the evilest human that even demons are afraid of him. How am I supposed to survive? But, something... seems strange? ** "Elaine.. it is not like brother didn't want you to marry him but.. he is too stupid for you." Okay, but I don't think you should destroy his household for that. "It is because you are too stupid that father will live a long life to take care of you." No need for that, I can protect myself. "Darling, mama is worried about you. Remember, when the men come, just whip their bun bun and make them bow to you. Don't be so kind-hearted." I just punched a group of boys ... "How about you kill me? I will not regret if I die in your hand." And what's wrong with the main leads. I am the villain's younger sister, not the female lead! Also, there's seem to be a secret. Will I ever live a happy life?