Spring Up is the debut extended play by the South Korean boy band Astro.

[1][2] In mid-January 2016, Fantagio announced that Astro would release a debut EP on February 23.

[3] On February 11, the first teaser video for the album was posted, presenting members of the group.

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".

[7][8] The group started promoting "Hide & Seek" with the b-side "Cat's Eye" on music shows on February 25.