B1A4 gave a sweet present to their fans to celebrate their fourth anniversary! The boys first debuted on April 23, 2011 with "O.K," which they returned to for a special dance practice video.
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Fans get to see the old B1A4 and the first song they released through this video so they can fall in love with the choreography all over again! The boys are cheerful, energetic, and enthusiastic, suggesting that they've become successful now but it was all thanks to their past.
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