The Duke of Mists and the Ice Bride

Noble lady Iris has always been treated coldly because her emotions never show on her face. Constantly compared to her adorable cousin Alice, she has failed at every marriage interview. When she finally finds a prospective husband, it is a duke rumored to be a "monster"afflicted with a curse that turns his head into smoke! Though shocked by his appearance, her expressionless face makes him think she's unfazed. "You truly are the bride I've been waiting for!
https://www.cmoa.jp/title/357399/