WATCH THIS RIGHT N.O.W!!! (i can't watch coz i'm only using my phone) HoMin are asked who they are going to choose between Boa and Yoona. Changmin chose Yoona!! 

http://www.youtube.com/watch?v=FXPl-G1u9qE&feature=youtu.be&t=34m11s

translation: 

Q: BoA or Yoona?

YH: BoA

CM: Yoona


Yunho says he's close to Yoona too, but BoA is his same age friend so it's more fun. Changmin says that Yoona and Yeonhee are both really beautiful friends