July 18, 2010 10:00 AM | by 
Fans thought that f(x)’s first performance of ‘Mr. Boogie’ on MBC Music Core was missing something - indeed, it was Amber! Unfortunately, this situation may stay like this for the next few weeks.
f(x) has ended promoting ‘NU ABO’ from their 1st mini-album and is now switching up to promote the song ‘Mr. Boogie’ starting July 17th on MBC Music Core. However, only four members were able to make it because Amber had injured her ankle and thus could not dance.
That’s not to say we shouldn’t watch their performances any more because an SM Entertainment official promised, “This is a small surprise event for fans. The girls will continue to greet fans through their individual activities.” This guarantees that the girls will be putting up special stages as 4 members both on the weekend music shows of July 17th and 18th.