F(x) "Pass out" at the rehearsal

F(X0's Kristal revealed a photo of three memebrs of F(x) lying down on the stage floor during the rehearsal on her Metoday. In the picture, exhasted Seolli, Amber, and Kristal are lying on the floor, resting their heads on other members's feet. Netizens responded to the photo with laughter, saying "they look soooo tired, " "Cheer up, F(x)," and "They have great bodies, though!"