The secrets of the lovely duchess

Story:

Read manhwa The secrets of the lovely duchess / 사랑스러운 공작 부인의 비밀 Luclia is a girl who was trapped in the demon archduke’s dungeon for seven years and saw ghosts. One day the prison wall collapsed and a man came. “Wow! are you a prince?” “Sorry, I’m just a duke.” Davier, Duke of the House of Montenfeltro. Sure enough, with his temperamental and violent personality, he would take Luclia, an unknown girl, as his princess?! “Duke, I wonder why you brought her here…” Luclia, who has just entered the word with the mysterious Duke Davier. Can two people understand each other and still be happy?