They're both AB so there characters are compatible with each other as well as know the boundaries for one another. In other words they understand each other
Hey. Where do you get the 2nd to the last video of Yuri where she was back hugging Hyoyeon? Is it from Seoul Music awards, right? Can I have the link? T__T I badly want to watch it. I badly want to see how Yuri back hugging Hyoyeon. Pleaseu. :(