Red Velvet took on their "Peek-A-Boo" choreography at twice the speed on 'Weekly Idol'!

Though they're far from rookies, the girls of Red Velvet express worry about the challenge, and Joy mentions she can't raise her arms due to her blouse. Still, the girl group impressed Jung Hyung Don and Defconn, who are always hard to please on the show, with their skills!

Take a look at how Red Velvet did below!