I would not recommend using Hyo Ri as example. Don't get me wrong, I am a fan, but what if the audience wants to know more about her and you have to talk about all the plagiarism problems she has?
BoA, while not currently active in Korea, is still a much better choice since she has accomplished so much to the point that she *is* a KPop icon. You can also use her to illustrate Korea's eagerness to export its culture to other countries like Japan and the USA since she's had debuts in both.