B1A4
Browse Artists
![Just Learn Bad [B1A4 | MV]](http://relaunch.mtv.co.kr/gsp/musicvideo/b1a4/M0294402_768x432.jpg)
![O.K [B1A4 | MV]](http://relaunch.mtv.co.kr/gsp/musicvideo/b1a4/M0291516_768x432.jpg)
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