f(x) are currently promoting their new title track "Rum Pum Pum Pum", a song about first loves, and they recalled their own first experiences.

Backstage at 'M! Countdown' on the 25th, Krystal revealed what her first love felt like and shared, "It's a heart-fluttering feeling," while Luna added, "Sparks fly." On the other hand, Victoria shared that a first love is not always such a happy thing, "It hurts a little at first, but once that phase passes, you feel all right."

Although Sulli previously mentioned that she once fell for one of her bodyguards, it seems that wasn't enough to be considered her first love as she confessed, "I've never had a first love. It will come someday I hope?" 

Though Sulli hoped that her first love would come one day, Amber seemed indifferent about it. She shared, "To be honest, I don't care so much about my first love, so I don't really know what to say."

f(x) will continue their comeback stages with "Rum Pum Pum Pum" this weekend and release 'Pink Tape' on the 29th!