Yes, please, I'd love to see this video too! I bet Seungyeon was even cuter than normal if she went all goggly over Sunye ... which might very well lead to cuteness overload and put me in the hospital.
I always thought the leader had to be Gyuri. Her self-confidence stood out from the first time I saw the group on an interview show (which was before I'd really heard any of their music).