Married To The Northern Duke Who Wasn’t In The Original

I was reincarnated into a sweet potato romance fantasy novel destined for a ‘Merry Bad Ending’ full of mutual misunderstandings. And as the older sister of the overpowered villainess who destroys the kingdom, no less. Being reincarnated is frustrating enough, but to be fated to die caught up in the kingdom’s destruction! Moreover, the family I was reincarnated into was a dysfunctional one that constantly ab*sed and neglected the villainess. ‘There’s no choice. I’ll have to raise her properly myself.’ Once my well-raised little sister becomes an adult, we’ll escape hand-in-hand to another country. It’s absolutely not because she’s cute…! But something’s strange. I keep getting entangled with a peculiar man who wasn’t even in the original story…? * * * “I believe you’re a good person, Seria.” “…Is it all right to trust someone so readily? Especially for someone who’s the head of a noble family.” At that, the man’s eyes crinkled as he smiled. At a glance, it was a gentle smile that could make angels weep, but in a way, it was an excessively benevolent smile that hinted at ulterior motives. “I don’t trust others. I only trust you and my own judgment.” His words felt profoundly meaningful, as if he had been observing me for a long time. What on earth is this man up to?