This interesting video was left on SM Entertainment official Youtube channel.

SEE ALSO: SM Entertainment announces debut of new girl group

SM Entertainment announced earlier that they will debuting their new girl group this year. But now they have left this mysterious video with a glimpse of Infinite's Dongwoo. But also with that is two members of which could be two members of ACES? SM Entertainment has revealed nothing else to the public on who those two members are and how Dongwoo is involved in this video. So keep checking allkpop for more news.