I Saved The Cursed Duke

I Saved The Cursed Duke manga summary:

She was leading a peaceful life until a man in desperate need suddenly appeared before her.

His identity was that of the country’s most handsome bachelor, the master swordsman Duke Elhart. Asturiya uses her powers on the Duke, but it only continues to heal him if she is next to him.

In the end, Asturiya fulfills Elhart’s request and steps into the outside world. Suddenly entering a false marriage—becoming the Duchess only in name—will Asturiya be able to adjust to this new world, while breaking the curse and falling in love?