SECRET performed the song "U-Go-Girl."

Today, SECRET came out in KBS 2TV "Music Bank" episode 700 special and performed Lee Hyori's song "U-Go-Girl" that had been released in 2008.

On this day, they not only performed their own song "YooHoo" but also "U-Go-Girl" by Lee Hyori. They caught much attention with their cute yet sexy image.

Photo Credit: KBS 2TV