Ha Do Sung (Daesung) is the famous rock star Hades who presents himself by hiding his identity through a mask.

Because of his secret family background, Do-Sung can't reveal his real identity, so he tries to live quietly without drawing attention to himself and joins the university.

Kim Byeong Gun (Jo Jung-suk) is the odd one out in his family of businessmen, wishing to pursue a career in musicals - despite his fear of performing in front of others.

Already Oh Doo Ri (Lim Ju-eun), is a talented actress who prefers to spend her time playing first-person shooting computer games than rehearsing.

[4] On October 24, it was revealed that the filming of What's Up was completed, and it was confirmed that the title would be aired on television cable MBN, with expected date the scheduled for early December 2011 or the beginning of 2012.