I Need to Raise My Sister Properly

After a sudden car accident, I woke up in the body of the villainess’s stepsister from the novel ‘My Beloved Santa.’ Determined to rewrite destiny, I vowed to guide my little sister away from a dark future, meticulously paving a path of happiness for her. My efforts, however, unexpectedly entangled me with the infamous Duke of Lexerville—a man notorious for his bloodthirsty madness. He warns me, ‘Didn’t I warn you back then that I wouldn’t let you go if you did something stupid?’ and interrogates me like a cheating lover when he sees me with another man. Yet, when I ask if he likes me, he simply dismisses it as ‘nonsense.’ If he truly doesn’t, then why does he act this way? Dive into chapter 1 to uncover the truth!