After Exchanging the Animal Transformation Potion, I Became a Snake Girl

My father forced my sister and I to take the demon pill. My sister became a beautiful and fertile snake girl, and I became a charming shark. After turning into a half-demon, her infertile sister was sent to the backyard of Prince Regent Jue Si. She died tragically in the backyard due to her aloof temperament. As for my sensitive mind, I was sent to the Star Reaching Pavilion and became a plaything of the dignitaries. In the end, I was thrown into a mass grave with my eyes open until I died. When we opened our eyes again, we were back to the day when we were fed the demon pill. My sister held my hand with tears in her eyes. "Let's change it. Sister, you have always been smart, and you will definitely be able to carve out a world in the treacherous Regent's backyard. As for those powerful people, leave it to me!" I readily agreed. In this life, when we sisters join forces, all those who killed us will get the retribution they deserve...