Often just called "Hyori", she was in the group Finkl originally. I actually didn't know anything about her until one of my Korean friends
started using this song as the ringing sound you hear when you try to call. The song sort of grew on me so I asked about it then downloaded it.
Oh, what she is singing about is that it would only take her 10 minutes to win you over. Sounds like about 9 minutes more than she needs!!
(OK, I will have to answer to my wife for that comment!!)
10 Minutes