The Precious Sister of the Villainous Grand Duke

Reborn into a war-torn novel as the sister of a cold-blooded villain, she had a simple plan: play the role of the little sister and survive until her brother's inevitable downfall. But the script has been flipped. The villainous Grand Duke has not only won the war—he has the male lead's head in his hand. Now, trapped in the obsession of a brother who refuses to let her go, can she escape the clutches of the protagonist of her own nightmare? Discover the dark obsession in Chapter 1!