I Died for My Country After Disguising Myself as a Man

In an era of male supremacy, she was raised as an unofficial princess. However, the situation changed and the government changed, so she had to disguise herself as a man, put on a mask, and go to the battlefield. When they met again, they could only see him holding a beautiful woman in his hand and getting married. She could only bless him because this person was her biological sister.