From the Start, I Witnessed My Dad Commit Murder and Didn't Stop Him. Guess What?

Period novel + heroine is reborn + younger brother is also reborn + younger brother is a villain + heroine is self-interested and doesn’t like meddling + heroine is a genius at studying + heroine has no feelings because of what she experienced as a child, so please don’t call her cold-blooded + this book has a male lead + the male lead has few scenes

Luo Yan is a fourteen-year-old middle school student. One night, she witnesses her own father trying to kill a woman, but she doesn’t stop him. Can you guess why?