in june 2016, s.m. entertainment announced that exo released their third studio album, "ex'act" and two singles "lucky one" and "monster" at the same time. on june 3, the group released the teaser of "lucky one" which in twelve hours got over a million views. the album's national pre-sales exceed 660,000 copies, making it the most pre-sold k-pop album of all time. the album later broke the record for the highest sales during the first week, breaking its previous record set by "sing for you", selling 522,372 copies in a week. the album also went on to top the list of united world albums chart. the second single from "ex'act", "monster", became the first exo number one on billboard world digital songs chart songs and spent a total of two weeks at number one. the album's first single, "lucky one" debuted at number three on the billboard world digital songs chart and remained in first place for two weeks. the song was also on the top of itunes in seven countries.