Kim Hyuna and Kim Myungsoo are in two of the most popular idol groups in South Korea, 4minute and Infinite. They've been on variety shows together, watched each other perform on music shows, and even said the occasional hello when bumping into each other in the salon. But they don't really know each other, and have never given the other a second thought. So what happens when one day, they are both are told that there will be a collaboration between her sub-unit, troublemaker,