Saving the Villain From the Heroine

I tried to save the sub male lead, who was poisoned by the female lead, but an accident happened! He said he would repay the favor, but he randomly sent me to the most notorious villain, the Family of Assassins?! The family that consists of the oldest brother, a knight in the Imperial Army preparing for a revolt, the second brother, a reverend with a large bounty on his head, and a father who is the greatest villain of all time... Will I be safe in this villainous family throughout my three-year contract? *Note: Promotional prologue for the homonym web novel.*

Sielle is an ordinary handmaid working for the Grand Duke Ferzei Yekarte. The thing is… she knows he's a villain of a story she read in her previous life on Earth. With her prescience, she managed to foil an assassination attempt on her master, only to be framed for the crime! Worse yet, when she drank the poisoned wine to prove her innocence, she turns into a little girl... And now the Grand Duke wants to ship her off to a notorious family of assassins? Will she manage to survive through all this, even if she knows how it will all end?" (Source: Pocket Comics)