Youngji used to be a CCM trainee and she was really good at dancing... She has danced to song like Sherlock(shinee) Bang(after school) Bad Girl Good Girl(Miss A) And many plus toi will see proof in this links

chercher this for plus covers par her : link and also the boys cover : link

In the montrer where they showed off charns and such she showed that she could dance to the songs (some of them)

In Weekly Idol there she danced to sherlock and warrior.

toi could also chercher on google: Youngji dance.