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10月26日，SM娛樂方面表示，由旗下男團EXO成員Chen、伯賢、Xiumin組成的小分隊EXO-CBX將於30日透過Naver V LIVE直播透露出道消息。
據悉，EXO-CBX將進行「EXO CHEN BAEK XI HOT DEBUT前夜祭」直播節目，向粉絲們分享有關出道活動的話題。當日節目將分為兩部分進行。第一部分將是能夠讓粉絲們看到成員們舒服休閒，與眾不同的超近焦距的「躺著做的節目」。第二部分將由EXO-CBX首張迷你專輯《Hey Mama!》的介紹、製作幕後故事與成員分享近況等組成。
10月31日0時，EXO-CBX的首張迷你專輯《Hey Mama!》將透過各大音源網站公開。11月3日，EXO-CBX將亮相Mnet音樂節目《M!Countdown》宣傳新曲。
