Nine-membered After School finally made their official comeback with a brand new album titled "Virgin", with their song "Shampoo" as their official title track. Similar to their previous 'marching band' concept back from their "Bang!" promotions last year, this time, the girls have completely taken their fans by surprise by coming out with a fully synchronized, two-minute tap dance MV titled, "Let's Step Up". A practice video of some of the members learning the dance routine recently surfaced, which shows just how much time and effort these girls put in to perfect every second of their dance. Check it out down below! === <Practice Video> <Let's Step Up MV> You can also check out their official KBS "Music Bank" performance by clicking here.