▁unusual ▁in ▁that ▁it ▁was ▁one ▁of ▁the ▁first ▁Korean ▁pop ▁songs ▁to ▁feature ▁Latin ▁be ats . ▁However , ▁this ▁single ▁proved ▁to ▁be ▁popular ▁and ▁chart ed ▁very ▁well . ▁She ▁quickly ▁followed ▁this ▁album ▁with ▁a ▁second , ▁Rou ge , ▁which ▁came ▁out ▁in ▁April ▁ 2 0 0 0 , ▁s elling ▁ 3 6 0 , 0 0 0 ▁copies , ▁and ▁c ement ing ▁her ▁status ▁as ▁one ▁of ▁South ▁Korea ' s ▁most ▁popular ▁female ▁dance ▁artists . ▁ ▁Two ▁years ▁after ▁the ▁release ▁of ▁T res , ▁Ba ek ▁released ▁her ▁fourth ▁album ▁Sm ile ▁in ▁September ▁ 2 0 0 3 . ▁Although ▁not ▁a ▁run away ▁success , ▁it ▁managed ▁to ▁sell ▁a ▁decent ▁number ▁of ▁copies , ▁placing ▁ 4 6 th ▁for ▁the ▁year . ▁However , ▁her ▁real ▁com eb ack ▁occurred ▁in ▁ 2 0 0 6 , ▁when ▁Ba ek ▁released ▁her ▁fifth ▁album ▁Sm ile ▁Again ▁in ▁March . ▁" 사 랑 ▁ 안 해 " ▁( I ▁W on ' t ▁Love ), ▁her ▁first ▁single ▁from ▁the ▁album , ▁was ▁a ▁ball ad , ▁unlike ▁the ▁rest ▁of ▁her ▁Latin - style ▁singles . ▁Although ▁this ▁was ▁a ▁significant ▁change , ▁it ▁proved ▁to ▁be ▁a ▁very ▁popular ▁song , ▁getting ▁to ▁the ▁top ▁spot ▁on ▁certain ▁performance ▁show ▁charts . ▁This ▁change ▁was ▁not ▁a ▁permanent ▁one , ▁as ▁there ▁were ▁many ▁Latin / d ance ▁tracks ▁on ▁the ▁album . ▁In ▁fact