f(x)'s Sulli thanked her fans for taking the group's latest track "Rum Pum Pum Pum" to #1 on music charts. 

Sulli posted to me2day on the 30th, "I'm so happy that our title track 'Rum Pum Pum Pum' is 1st on the daily charts. ^^ I hope it's the same from now on~<3 Hehe! Thank you so much, everyone!" After its release on July 29, the song launched up 9 music charts, including Mnet and Melon.

She also shared a selca wearing the outfit for their concept. Fans commented, "Sulli's looks and f(x) songs are the best," "Congratulations," and more.