the group released their first studio album entitled "xoxo" in june 2013 with two versions, korean edition "kiss" and the "hug" mandarin. a difference to the era of "mama", exo-k and exo-m did their promotions in separate, however, with "xoxo" had their promotions jointly; mainly in south korea. exo recorded the single main "wolf" but the rest of the songs they recorded them separately. the two versions collectively ranked number 1 in billboard world albums chart a week after its release.