Spring Up

In mid-January 2016, Fantagio announced that Astro would release a debut EP on February 23. On February 11, the first teaser video for the album was posted, presenting members of the group. On February 15, a "Highlight Video" was posted, presenting all the songs on the album. On February 18, the first music video teaser was posted. On February 22, the music video for "Hide & Seek" was released and on February 25, the video for "Cat's Eye" was released. ==Promotion==

Astro held a live showcase on February 22–23, where they performed "Hide & Seek" along with the dance track "Cat's Eye", and ballads "First Love" and "Morning Call". The group started promoting "Hide & Seek" with the b-side "Cat's Eye" on music shows on February 25. They first performed the songs on MBC M's Show Champion, followed by performances on Mnet's M! Countdown, KBS' Music Bank, MBC's Show! Music Core and SBS's Inkigayo. The EP debuted on the Billboard World Albums chart at #6, and it lasted for two weeks on the weeks of March 12 and March 19. ==Track listing==

Weekly Monthly Year-end ==Sales and certifications==