the third ep of the group "overdose", was released on may 7, 2014. it was originally scheduled to be released on april 21, but was delayed by the swreck of the sewol on april 16. "overdose" was promoted in the same way as "mama", with exo-k promoting exo-m in china and south korea. the album reached 660,000+ pre-orders before its release, so it is the most pre-ordered ep in history. the korean edition was also positioned at number 2 in billboard's world albums chart and number 129 on the "billboard 200", making the male group of korea with the highest billboard 200 graphics to exo. "overdose" became the best-selling album in sotuh korea in 2014 and the first mini-album in finishing the annual graphics and winning the album of the year at mnet asian music awards. at the end of the year, exo was the top-selling k-pop artist in japan. on may 15, 2015, s.m. entertainment confirmed that the exo-m, kris, leader signed a lawsuit against the agency, indicating violation of human rights as the main reason. on october 10 luhan also signed a lawsuit against s.m. entertainment, due to health problems and be treated differently than the korean members. s.m. entertainment announced that the group will continue promoting with ten members. the group held their first tour "exo from. exoplanet #1 - the lost planet", beginning on may 24 in the olympic stadium of seoul. tickets of the concert is finished 1.47 seconds.