Help me name this korean tv show/drama?

I saw one episode but couldn't understand the language or read the chinese subtitles, but it was set in a historical period. The characters wore traditional clothing and the main character, a girl, owned a clothing (hanbok, i believe it's called). In this particular episode, there was a fashion show that she put up, and this terrible lady eventually ruined it in an act of revenge (earlier in the episode the lady and her daughters went in her store and the main character backtalked them, it seemed like? The angry lady didn't like that at all). In the opening song, there seems to be a prince involved in the story.

The show seemed interesting and I would like to watch it...