With the way things went with EXO, its no wonder EXO-CBX was the Phoenix that rose out of the ashes of the former subgroups, EXO-K & EXO-M. The once beloved subgroups seemed to go south when former members Kris Wu, LuHan, & Z.Tao departed for personal reasons. At one point, I thought I heard that KyungSoo was being considered to crossover to EXO-M but I never heard anything about that since then. It would have made EXO-K a five man group and EXO-M a four man group. I think it would have been interesting. But they wanted to start fresh, make a new start, and so EXO-CBX was born....
Farewell EXO-K & EXO-M
(A Rant... Read On If You Dare)
On a personal note.
1. Korean Music Wave EXO "MAMA" 2. Gayo Gaejun EXO "MAMA" metal version, (starts at 4:10)