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 더 많이 당신 will see proof in this links
검색 this for 더 많이 covers 의해 her : link
and also the boys cover : link
In the show 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.
당신 could also 검색 on google: Youngji dance.