Hello! I'm looking for manga with twins in it - a boy and a girl. They are bastards of some wealthy (but quite pitiful) lord in a fictional kingdom. The boy was brought up as a noble man and was a captain of king's guard and the girl was raised by her mother as a baker ( or whatever). And the point is that after some accident at the palace the boy disappeared and his sister was taken in as his substitute.
It just slipped out of my empty head what the title is. But as far as I remember the art was quite beautyful.
Thank you!

Migawari Hakushaku no Bouken