Alas, the joy surrounding the AOA's comeback was only short-lived as the MV was made private and removed almost as soon as it was revealed. 

Needlessly to say, fans were dumbfounded and beyond befuddled when the MV suddenly disappeared. Now they are making all sorts of wild guesses as to why "Good Luck" was taken down, as FNC has left them in the dark.

Of all the guesses, the one which has most people convinced is the ridiculous amount of product placements in the MV. Apparently, "Good Luck" contained product placements for 'Sprite,' apparel brand 'Ellesse,' and possibly even for 'Toyota (according to netizens).' One person commented on an AOA thread on DC Inside, "Honestly I wasn't sure if I was watching an MV or a three-minute long commercial. There was no plot and it was just full of product placements." 

Others claim that it was the exposure of Jimin's bra at some point in the MV; this is not for certain and merely speculation. 

Whatever the case may be, fans are of high hope that "Good Luck" will be uploaded once again and that there will be no further issues in AOA's anticipated comeback.