The Prince's Vengeful Bride

In her past life, she was poisoned by her half-sister, her maternal clan executed. Reborn, the heroine returns for revenge! She tears down her half-sister and confronts her father. She makes her half-sister marry the second male lead, who poisons her. The half-sister is tormented by her maid. Her father learns the truth and takes his own life. After revenge, she discovers the 'foolish' Prince secretly protected her. They confess love, have twins, and reach a happy ending!