I feel bad for talking bad about Heechul just a while back.
I thought its because of his careless mistakes thus in order to prevent them, he didn't have any dancing parts in Sorry Sorry and Its You.
I am terribly wrong.
Its because of a car accident in 2006!
"Because of a car accident, Super Junior member Kim Heechul suffers from a partial bone fracture on his left thigh."
There is a long metal thingy in his leg now!!!!!
Awww I feel bad and apologetic now.
*dances SorrySorry dance*