I really love EXO ♥!! But there are 2 members who stand out for me. :)

in EXO-K...

 Kim Jong In

Stage name:KAI

EXO-K's Dancing Machine: Visual: and Lead Rapper...

http://www.youtube.com/watch?v=koEP59qGkRQ

in EXO-M...

 Zhang Yi Xing 

Stage name:   LAY

EXO-M's Dancing Machine and Vocalist

http://www.youtube.com/watch?v=F6yCa5YmtPw

At first I have no idea that both of them are Exo's

DANCING MACHINES... ^///^

and obviously, my favorite teaser of EXO is 

TWO MOONS!!

:D

http://www.youtube.com/watch?v=RJLfGhDHigo