Just two chapters and I'm already obsessed. Those noble ladies are fairly decent compared to those bullies in another manga. Idk if this will take turn to GL path or not, but these girls need some happiness.
@karolyn as
@IrskUlvehund wrote, "Of Course, I'll Claim Palimony" might be what you're looking for. "May I Please Ask You Just One Last Thing" or "Slow Prison Life" are nice too, they might not annul the engagement first, but both MC sure kick ass.
But I could see why this story's MC couldn't just carelessly annul her engagement, her family's is in the verge of bankcruptcy and her fiancee's family is the one who's helping them. No wealth, no power.