Did you check out f(x)'s highlight medley for their upcoming studio album 'Red Light'?  If so, you must have heard a song that was written by both Sean Alexander and... (drum roll please) member Amber herself!

She hinted to fans that she personally took part in the album, which actually comes as no surprise nowadays considering how active idols are becoming in the whole music creating process!  Still, this is definitely impressive.  As a true tease, she did not reveal the song title to her fans, rather asking as if she didn't know, "Hey Sean Alexander, which song did we write again?? :D"

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Stay tuned for the album's full release because then you will know and surely be impressed with Amber's contribution!

Hey @seanalexander23 which song did we write again?? :D https://t.co/Gm5kXoWBxZ

— Amber J. Liu (@llama_ajol) July 2, 2014