f(x) appeared on radio show, 'Cultwo Show,' recently where Amber talked about her appearance on military-themed variety show, MBC's 'Real Men.'

She said, "I was good physically, but I couldn't understand things, which was hard. Honestly, if I got the chance, I would like to go, but it gets so difficult that if I don't get things explained to me, I think it'd be hard."

She then chose Krystal as the member of the group she'd like to see on the show, explaining, "I think it'd be fun.  Her life style is the complete antithesis to mine.  I want to kind of order her there," making everyone laugh.

Krystal had no problem with this, stating, "I am also athletic.  I thought that I'd be able to do it, but Amber said it was really hard for her."

Yay or nay to seeing Krystal on the show?