Idol group INFINITE, who recently began their promotion cycle for "Be Mine", revealed that their ideal type for a female best friend would be none other than f(x)'s Krystal. On August 9th, INFINITE guested on "Choi Hwa Jung's Power Time" radio for its summer special corner called, 'I Need a Best Friend'. During a segment where the INFINITE members talked about their friendship index, Choi Hwa Jung asked, "If you were to choose between 4minute's HyunA and f(x)'s Krystal, which one?" Surprisingly, five out of the seven members chose Krystal. When asked for a reason, the five members replied, "We like HyunA too, but Krystal's stage manners are good." On the other hand, Sung Jong, who picked HyunA, danced to "Bubble Pop!" right on the spot and caused everyone in the studio to laugh.

Additionally, INFINITE received an overwhelming turnout during their fans' support message corner, and member Nam Woo Hyun revealed his abs through the visible radio camera.