HyunA joined comedians parodying "Bubble Pop" on 'Gag Concert'. On the episode of the show that aired on the 24th, in the 'Superstar KBS' corner, Bbong Brothers Kim Jae Wook, Lee Sang Min and Lee Sang Ho sang a trot version of "Bubble Pop". Towards the end of the song, they called HyunA to the stage and she came out through the small curtains.  She sang and danced a couple lines of her song with the three comedians. At the end, she was a little embarrassed and tried to hide behind one of them. The four of them were joking around with each other while performing, which showed them working together for the fun of it. Check out the performance of Bbong Brothers and HyunA: Source: Newsen via Nate