f(x) will serve as your alarm clock as they collaborated with the mobile app, Dodol Pop.
They recorded a wake-up message for fans to download. The video says, "This is f(x)! Hello! Wake up, it's already morning!" And then they sang a portion of their new single ‘Rum Pum Pum Pum’. At the end, they shouted, "Hurry and wake up, right now! Wake up!"