Red Velvet's Yeri & NCT's Renjun, Jeno, and Jaemin have dropped their music video teaser for "Hair in the Air".

In the MV, the SM Entertainment labelmates knock on a few doors and wonder who's there. As previously reported, Yeri, Renjun, Jeno, and Jaemin are featured in the upcoming 'SM Station' track, which is a collaboration for the animated TV series 'Trolls'. The OST album will also include another OST sung by NCT Dream's Haechan, Chenle, and Jisung titled "Best Day Ever". 

"Hair in the Air" for 'SM Station 3' x 'Trolls' drops December 13 at 6 PM KST!