Duchess Against Her Will, or the Beast's Curse

Betrayed by her husband, and fate threw her into another world and made her a duchess? Stay away from the cursed mine, find the right guard, and never go into the forest—because nearby there’s someone who hates you. But if you meet him—beware! You’ll have to take up the sword yourself, deal with the curse, and get rid of the robbers. Only why does one of them insist that it’s him who is the real duke?