His majesty(Park Seonghwa)

Having the same gender twins was a crime because it meant bad luck, because of that, Y/N was force to live her life as a male and her sister as a female.
Her father never let Y/N reveal her identity as a a female and trained her to become strong like a man.
on the other side, Y/N's sister Jinyoung was taught how to be a lady and learned how to dance. What will happen if the Prince of Aurora finds out.