Girl's Day Hyeri showing off(?) her arm muscles becomes hot topic!

The GIF file of the member of the girl idol group, "Girl's Day",
Hyeri showing off(?) her arm muscles becomes hot topic!

Internet users who saw this file reacted : "It's incredible but.. her expression is funny lol",
"She turned into a hulk?! lol", "Hyeri! Pay attention to the camera! :)", etc.

 
▲Image Source: Online Community &
SBS「Starking」