Jewelry ‘Back It Up’ for Music Bank comeback

http://www.youtube.com/watch?v=7V_cfb0fx2sendofvid[starttext]Having performed on M! Countdown yesterday, the four girls continued with their comeback stage on this week’s KBS’s Music Bank.More than a year has gone by since Park Jung Ah and Seo In Young left the group to pursue their solo careers, and it has been one long wait for fans as Star Empire patiently scouted replacement members to join