Boukun Vaderu no Hanayome

From Transient Mirage: In order to pay off the debt her father left behind, Nina has been working from morning till night every day. And for this hard-working Nina, a sudden wedding story appears...?! The husband-to-be is rumored to be the coldest and violent man in the entire Badell Kingdom: The first Prince Sandis. The Kingdom has offered Nina a proposal that cannot be refused and is now forcing her to become the bride, but she's starting to fall for the violent Prince! This is the secret wedding story that will cross-class division.