The Guardians (kdrama) - no romance for this one but the female lead is tough and can surely fight. Well the female lead is Lee Shi Young so if you're familiar of her works you'll know she's a badass
The King's Woman (cdrama) - She knows martial arts and is even better than the male lead. If you like Empress Ki then you'll probably like this one too ^^
The Rise of Phoenixes (cdrama) - She used to attend school for her lazy brother so she was the one trained instead (though they didn't really showed that part). Though they've shown her some of her fighting skills, she's more of the brains
Lost Love In Times
The Princess Weiyoung - Story is somehow similar to Empress Ki regarding the romance
Sound of the desert - She was raised in the wild that's where she got her fighting skills