The secrets of the lovely duchessSarangseureoun Gongjang Buinui Bimil; 사랑스러운 공작 부인의 비밀; The Secrets of the Lovely Duchess; 愛らしい公爵夫人には秘密がある; Тайны милой герцогини

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?