Is that Heechul's real hair? :O

Well... I was sure that the hair he had in the U MV was hair extentions... But in this video it looks so real O_o [and prettey<3 OMG I really 爱情 long hair on guys, and Heechul looks just GORGEOUS!]
I mean... I thought that his hair is like it was during Super Junior Full House, because when they had the preformance he was with the long hair and everything but in real life he had short[er] hair...
I mean, it's probably the extantions, but why would he put them while practicing? :O