Confused Wife from Another World

She, Chen Chuchu, is an ordinary person in the 21st century who has received higher education. But he accidentally traveled to the ancient times that he had dreamed of, and began to change his destiny. He, the owner of Hamano Yiren Castle, is a romantic man with many wives and concubines. He is also a demon king who is aloof and kills without blinking an eye. Anyone who offends him will only die. She did not captivate the whole country. He is a handsome boy. She looks average, with a figure but no figure, and looks but no appearance. But he has everything, and he is an indispensable man in the eyes of girls. But why does he have a special liking for her? I can't understand it in every possible way~~~~