Despite not being listed as performing on the 30th October episode of Music Bank, fans and viewers were kind of taken by surprise when they thought they saw f(x) appearing on stage when it was the turn of rookie girl group, Secret to perform their song, I Want You Back. On closer scrutiny, you will realize that three of the Secret members were actually wearing outfits that were worn by f(x) for their photoshoot previously. With the exception of the leader Jun Hyo Sung who wore something different, Han Sunhwa wore Krystal's outfit, Song Ji Eun wore Luna's outfit while Zinger had Sulli's outfit. You might not believe it but these are Secret stage clothes for which they have worn before when they had their showcase before their debut. So while f(x) only wore it for a photoshoot, Secret are using them as stage clothes. credit: dkpnews Secret have been receiving a good response for their single, I Want You Back on the various music shows while f(x) are preparing for the release of their new album. Many thanks to NeeA for the tip.