Damo (조선 여형사 다모)

Chae Ok (Ha Ji Won) was separated from her brother when her father, a nobleman, was accused of treason. She managed to make her way and becomes a Damo, a low ranked woman detective. Skilled in swordplay, she must not only fight crime, but to face inequality for her status in society. Her brother grew up to be a rebel leader fighting against social injustice and both brother and sister faced off against each other on opposite sides of the law.

(Source: DramaWiki)