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 もっと見る あなた will see proof in this links
検索 this for もっと見る covers によって her : link
and also the boys cover : link
In the 表示する 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.
あなた could also 検索 on google: Youngji dance.