Before I Was Born, I Planned Revenge Ep. 4

In her past life, Ellie was shamed as a bastard by her biased father and ultimately murdered by his beloved mistress. After death, she learns her world was a novel, and she was only a disposable character. Reborn in her mother's womb, Ellie plots from before birth. Using foresight and cunning, she wins the trust of the head of the Grant family, exposes a poisoning scheme, and drives her enemies out, securing justice and a future for herself and her mother.