Question: how did exo cbx form?
Answer: But then three of the Exo-m members left and they decided to get rid of the sub units, I think. Exo-cbx was created after this and is the only sub unit in exo that is active. ... On July 29, 2016, Chen, Baekhyun and Xiumin appeared in a video titled "Reservoir Idols" during Exo's concert tour Exo Planet 3 – The Exo'rdium.