3 , 0 0 0 ▁units ▁in ▁its ▁first ▁month . ▁It ▁went ▁on ▁to ▁sell ▁over ▁ 1 1 0 , 0 0 0 ▁copies ▁in ▁total . ▁M embers ▁of ▁the ▁group ▁participated ▁in ▁pen ning ▁lyr ics ▁to ▁their ▁songs . ▁ ▁Four ▁singles ▁were ▁released ▁to ▁support ▁of ▁the ▁album : ▁" Big ▁Bang ", ▁" Big ▁Bang ▁is ▁V . I . P ", ▁" Big ▁Bang ▁ 0 3 ", ▁and ▁" Dir ty ▁C ash ". ▁ ▁Background ▁ ▁Big ▁Bang ▁was ▁the ▁first ▁id ol ▁group ▁formed ▁by ▁Y G ▁Entertainment , ▁whose ▁previous ▁ro ster ▁included ▁hip ▁hop ▁groups ▁Jin use an ▁and ▁ 1 TY M . ▁The ▁qu int et ▁held ▁their ▁official ▁debut ▁on ▁August ▁ 1 9 , ▁ 2 0 0 6 ▁at ▁the ▁G ymn ast ics ▁Arena ▁in ▁Se oul ▁Olympic ▁Park ▁during ▁the ▁Y G ▁Family ▁ 1 0 th ▁Year ▁Con cert , ▁which ▁was ▁broadcast ▁the ▁following ▁month . ▁Their ▁first ▁single ▁" Big b ang ", ▁released ▁shortly ▁there after , ▁contained ▁the ▁songs ▁" We ▁Bel ong ▁T ogether ", ▁featuring ▁label ▁mate ▁Park ▁Bom ; ▁" A ▁F ool ' s ▁Only ▁T ears " ▁( K ore an : ▁; ▁Re vised ▁Roman ization : ▁N un mul pp un in ▁Bab o ); ▁and ▁" This ▁Love ", ▁an ▁adaptation ▁of ▁the ▁American ▁rock ▁band ▁Mar oon ▁ 5 ▁song , ▁re written ▁and ▁performed ▁by ▁G - Drag