AOA's sexy blonde vixen, ChoA, with the voice of an angelic diva dropped her teaser video for the girl's comeback with "Heart Attack."

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Appropriate for the track title, there are the sounds of a heart beating and the bleep-ing of a machine as ChoA looks gorgeously at the camera with her signature blonde look and sexy gaze.  Is she even wearing clothes?  Who knows.  She just looks as seductive as ever!

Stay tuned for other teasers.