Girl group Rainbow's unit group Rainbow BLAXX's member Jaekyung in the waiting room was revealed.

Yesterday, Rainbow BLAXX's behind-the-scene pictures of MBC "Show! Music Core" were posted on their fan page.

The tight corsets are the point to Rainbow BLAXX's song 'CHACHA,' and Jaekyung was trying to wear it in the waiting room. But as the stylist is helping her, she is holding her breath in, almost tearing up and enduring the pain.

Photo Credit: DSP Media