Looking for a manhwa

Hi, I'm looking for this manhwa/manga that I've read where there was this girl that went to her aunt's house in the capital i think and met this blonde duke which she fell inlove with. When she returned home to the country side she couldnt forget that duke and some time later that duke suddenly came to their house as a slave instead. The two fell inlove and I remember that her 12 y/o brother was like enlisted in the front line army and to bring him back she had to like follow someone's rules or smth.

In the end they lived in a secluded village where they had their daughter (?) go to the neighboring king's place and returned smth that that king gave to the FL. I remember the guy's name starting with E like Edwin or smth