Jawoorim's Kim Yoona revealed a picture at the filming of  MBC 'Happy Day'.

On the 10th, Kim Yoona posted on her Twitter a group picture, along with the comment "Today's our MBC 'Happy Day.' It will air on the 12th."

In this picture, Jawoorim members are posing for the camera with the MCs of 'Happy Day'. Kim Yoona is holding up V sign with her hands and looking very bright. 

Fans who saw this picture have commented "Wow! I will definitely watch" and "I wonder what they talked about."