I Became The Female Lead's Step Sister

The world can be a place of joy and laughter or a place of pain, tears and sorrow. I was unfortunate enough to be in the latter description of the world. But one day, in a world of adventure, fight for love and survival, I finally find myself as a mere pawn destined to end tragically. I transmigrated into a no-romance novel called 'Duchess Accorsa' as the only step sister of the villainous female lead. And it is my duty to make this place my world of happiness, my own very solace.