The Villain Grandmother's Demon Husband

She transmigrated at the worst possible moment—right when the hero and heroine get their happily ever after, leaving her stuck as the scheming grandmother surrounded by wedding gifts meant for someone else. The groom? The notorious Black Mountain Demon himself. With the original bride long gone, there's only one solution: marry the demon lord herself. When the story's two greatest villains tie the knot, chaos and unexpected romance ensue in this hilarious twist on a classic tale.