f(x)'s Sulli revealed that she has never been in love before.

In Mnet "M! Countdown" aired yesterday, f(x) held their comeback stage for their new title song "First Wisdom Tooth."

"First Wisdom Tooth" is about the pain of first love.

During the short interview held before their comeback stage, Sulli said, "I haven't had my first love yet. It'll come someday, right?"

Luna said, "It's very nerve-wracking" and Victoria, "It hurts a little but when you pass the stage, it becomes okay."

Amber said, "I don't really care much about love so I'm not sure."

Photo Credit: Mnet