f(x) made their comeback on Music Core today with their follow up track called Mr. Boogie. Their title for their follow up track sure is strange yet interesting. If you haven't already listened to it, it can be found in their NU ABO mini album. And if you've always been scared of boogie men hiding under your bed, don't be. Just sing along with f(x) and he'll go away ^^ All members were present except for Amber.

Watch their performance right here:



Credit: CrazyCarrot250@YT