Red Velvet's Yeri, NCT Dream's Renjun, Jeno, and Jaemin are collaborating with the animated TV series, 'Trolls'!

Previously, the 4 SM maknae line members introduced a new collab they worked on for the latest season of 'SM Station' - titled "Hair in the Air" - causing curiosity. 'SM Station 3' has now revealed that "Hair in the Air" will in fact serve as the opening and ending theme song for 'Trolls' which premieres on TV in Korea beginning this December 20. 

But wait, there's more! In addition to "Hair in the Air", fans can also look forward to another theme song for 'Trolls' titled "Best Day Ever" sung by NCT Dream's Haechan, Chenle, and Jisung, all being released together this December 13!

Meanwhile, 'SM Station 3' is SM Entertainment's newest collaboration music series with songs dropping every other Thursdays for the next year.