Why is HyunA so sad?

Nobody knows as of yet, but HyunA of 4minute definitely had tears in her eyes for this week's performance of "What A Girl Wants" on Music Core. The fierce girl wipes away a tear at 0:13 and is starry eyed for the whole song. Her rapping wasn't as intense as her other performances and her usual stellar dancing looked dull and tired. What could possibly be hurting our beautiful HyunA so much? Neither Cube Entertainment nor the Korean media have given or reported the reason for HyunA's melancholy as of yet. Netizens have been speculating that her stomach problems might have returned (which was the reason she left Wonder Girls). Others think that it might've been "that time of the month," while some felt it's just a classic case of celebrities being overworked. Being only 17, HyunA must be stressed out from her crazy Korean celebrity life. Whatever it is, give the girl some support! Leave a shout out for her over at the 4minute forums!