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WikiPedia: 2nd_Confession http://www.allkpop.com/2013/04/btob-releases-video... http://www.allkpop.com/2013/04/btob-to-serenade-fa... http://btobofficial.com/ http://www.melon.com/cds/album/web/albumdetailmain... http://www.gaonchart.co.kr/main/section/search/lis... https://www.youtube.com/watch?v=7zuoNuI4fHQ