credits to KangTaForever.com.
A hidden camera is behind a one-way mirror backstage before a show. Watch what singers do in front of a mirror as they prepare to perform. No one knows the camera is there, but Hong Lok Ki.
LOL. I think the most hilarious (and grossest) part is when Jae Yong (DJ DOC) picks his nose, then feeds the poor unsuspecting Woo Hyuk (H.O.T) a snack from the bag he has. Ew.