MAMAMOO's Whee In celebrated her 26th birthday on 'Show! Music Core'!

During her performance of "Water Color" on the April 17th episode of the music show, her dancers suddenly came up with a baseball cap that stated, "Today's my birthday," and they revealed messages on the palms of their hands that said, "Happy Birthday." 

The producers of 'Show! Music Core' got into the celebration as well as they put up the message, "Happy Wheein Day," and other birthday decorations onscreen.

Happy Birthday, Whee In! Check out her performance of "Water Color" above.