AOA drops individual teaser images for the two concepts shown so far

Be still your hearts!  The radiant angels of AOA are here again with more teaser images for their first studio album, 'Angel's Knock'!

The girls are continuing on with the two concepts shown previously for song "Excuse Me" and "Bing Bing."  As last time, "Excuse Me" gives off a Sherlock-y vibe with the trench-inspired attire while "Bing Bing" should be more like "bling bling" because there's a lot of glitter, lens flares, and glamor.  Either way, the girls look as good and sexy as ever!