Uniqueness of f(x)

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f(x) is one of the hottest and unique girl groups in the Kpop World. What makes them so unique?
Choose one below:

~A member that looks like a boy
~The beat of their songs
~The genre of music every comeback
~Their costume
~The image teasers
~The music video concept
~The music video effects
~They have no fandom name (as of today)
~They aren't showing their skin just to look and be sexy


Thee us what you think!