Possible Clues:

• Yanni's BA major at Minnesota
• One-named singer with the 2013 top 5 hit 'Gentleman'
• K-pop sensation of 2012
• 33-Down star who sang "Gangnam Style"
• K-pop star who rose to fame in 2012
• __-ops (CIA activities)
• K-pop star whose hit 2012 song refrain made "The Yale Book of Quotations"
• ___.D. (therapist's deg., often)
• "4X2=8" rapper from Korea
• K-pop singer with the first billion-view YouTube video