In May 2014, Kris filed a lawsuit against S.M. Entertainment to be removed from the group. Luhan followed suit in October 2014. Following their departures, EXO carried on with ten members.
In May 2011, at a Hallyu business seminar held at Stanford University, Lee Soo-man spoke about a strategy of debuting a new boyband, in which they would be divided into 2 subgroups, promoting the same music simultaneously in South Korea and China by performing songs in both Korean and Mandarin. After several changes, in December 2011, the group finalized their name to EXO, taken from the word exoplanet. They are divided into two subgroups, EXO-K ('K' for Korean) for South Korea and EXO-M ('M' for Mandarin) for China. They debuted their first televised performance at SBS's annual Gayo Daejun event on December 29, 2011.
EXO's second solo concert was announced in January entitled EXO From. EXOPLANET #2 - The EXO'luXion. Five concerts were held in Seoul at the Olympic Park Stadium starting March 7. 1.2 million fans had attempted to buy tickets online.
EXO's second studio album, Exodus, was released on March 30, 2015 in both Korean and Mandarin versions. Domestic pre-sales for the album surpassed 500,000 within 24 hours, setting a new record for pre-sales. The group released an early release of their title track 'Call Me Baby' on March 27, due to leaked versions of the song which received an all kill status, ranking #1 on all Korea's major music charts. On March 29, EXO released their track “First Love,” a special gift for EXO-Ls which was available for only 10 hours. On March 31, EXO released their music video for "Call Me Baby", the Korean version receiving 4,000,000+ views and the Mandarin version receiving 2,000,000+ views in less than 24 hours.
'Call Me Baby' proved to be successful winning eighteen times on music shows, making it the second most awarded song ever. Exodus (Korean Ver.) also broke records after staying number one on the album chart for four consecutive weeks.
EXO starred in their own mini web series EXO Next Door supported by LINE and co-produced by SM Entertainment. The first episode aired on April 9. Baekhyun sings the OST "Beautiful" released on music sites on April 22. The song topped major music charts after its release and became the first web-drama OST to do so.
On June 3, Exodus's repackage album, titled Love Me Right, was released and was accompanied by a music video of the same name. The repackaged album contained the original tracks of Exodus and four new songs.