Choi Jung Yeol, the director of upcoming movie 'Glory Day,' revealed the reasoning behind his decision to cast EXO's Suho (Kim Jun Myeon).  

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During the recent press conference for promoting the movie, he said, "There were two reasons I cast Kim Jun Myeon.  I believed there was deep significance in the act of continuously discovering young actors alone.  I had an ambitious desire to meet an actor who could bring forth the future of Korean film.  Also, if I were to cast a star, I had an ambitious desire to shatter the normal image [that star] has.  

"In Jun Myeon's case, both those reasons properly matched up, but I wondered if the viewers would enjoy it if the role of the poor Sang Woo was given to Suho of group EXO, which is flashy, cool, and provides a fantasy for their fans."

That's probably why it took him so long to finally cast Suho!  You can see if it was all worth it with the March 24 premiere.