Well, it's just a monster (over a hundred years old) brother, his sister in disguise, and a certain female crown prince who unsuccessfully pursued him.
One day while passing by a certain place, his sister was unfortunately hit by a beautiful woman from a tall building and nearly died, and then she got engaged to her. Then, being abducted intentionally or unintentionally by the monster brother, he fell in love with the unruly young lady who had someone in his heart...
(Author: Damn... This copywriting... I'm really... I can't complain... Just ignore me! The Descendants of the Lady... Disclaimer, asking Weiyu to remember Cheng Weixi is too exaggerated... Unacceptable!)