Exo( Korean :엑소; stylized asEXO) is a South Korean - Chinese boy group based in Seoul . Formed by S.M. Entertainment in 2011, the group debuted in 2012 with twelve members separated into two subgroups, EXO-K and EXO-M, performing music in Korean and Mandarin , respectively. EXO rose to fame with the release of their best-selling first albumXOXO(2013), which contained the breakthrough hit "Growl".XOXOwas a critical and commercial success, winning both Disk Daesang at the 28th Golden Disk Awards and Album of the Year at the 15th Mnet Asian Music Awards . It eventually went on to sell over one million copies, putting EXO as the best-selling Korean artist in twelve years.Their third EPOverdose(2014) made EXO the highest-charting Korean male act on theBillboard200.EXO were later ranked the most influential celebrity by Forbes Korea for the year 2014.In 2015 EXO broke their previous Billboard record with the release of their second studio albumEXODUS, which became the highest charting album for a male K-pop group on theBillboard 200as well the K-pop album with the highest first week sales.EXODUS's title track "Call Me Baby" also earned the honor of becoming the first and only K-pop track to enter the Canadian HOT 100 .EXODUSlater went on to sell more than one million copies, earning EXO the title, "double million sellers." Their fourth EPSing For You(2015) later brokeEXODUS's first week sales record by selling 267,900 copies in its first week.In early 2016, EXO were revealed to have again ranked as the most powerful celebrity by Forbes Korea for the year 2015.In May 2014, Kris filed a lawsuit against S.M. Entertainment to be removed from the group.Luhan followed suit in October 2014.In April 2015, Tao suspended his activities and subsequently followed suit in August 2015.Following their departures, EXO carried on with nine members.