1. EXO is a popular South Korean boy band formed in 2011 that is divided into two subgroups: EXO-K for the Korean language and EXO-M for Mandarin. 2. The document discusses EXO's achievements including multiple album releases and winning awards, as well as their reality show EXO Showtime. 3. The author's favorite member of EXO is the group overall, particularly praising their success since debut and variety of music.