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f(x)'s new song, Chu~♡, has gained a lot of attention for its addicting tune as well as its powerful choreography.From Victoria's flip to the perfectly-synchronized steps, you can't help but wonder who choreographed the dance.So who is it? Well none other than SM Entertainment's regular Rino Nakasone. Rino has choreographed for big stars such as Gwen Stefani, Britney Spears, Chris Brown and a lot of SM artistes such as SHINee and SNSD. No wonder fans have been extremely impressed by f(x)'s comeback and choreography.On a side note, their full first mini-album is now out in Korea and it consists of three songs, Chu~♡, Step by me, and You are my destiny, a duet by Luna and Krystal.