The song that brought me to like kpop was It's you by Super Junior!
This was the very first kpop group/music/video i've listened. I saw their dancing version of "It's you" at a tumblr blog i followed.
When I first saw, there was this one particular person that i couldn't take me eyes off. His dancing was just out of this world! I couldn't figure it out who the guy is and after 1 year and 8 months i still don't know who he is (¬_¬)