I JUST stumbled across this song right now, but I INSTANTLY noticed the similarity in the two tracks...

ARIANA GRANDE

f(x) 

No hate whatsoever, I love both songs, but I just thought I would bring this up. Did SM like buy the track? or.....

UPDATE!

Ah! I get it now!~

"The song was intended for her album Yours Truly, but ended up not making it to the album due to an uproar with her management/company over selling the song. The song was infact purchased by S.M. Entertainment, a South Korean company who then reworked the song for their girl group, f(x). "