Spring Up is the debut mini album by South Korean boy band Astro. The album was released digitally and physically on February 23, 2016 by Fantagio. The album contains five tracks with the lead single, "Hide & Seek" and second single "Cat's Eye".

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

Astro held a live showcase on February 23, where they performed "Hide & Seek" along with dance track "Cat's Eye" and ballad tracks "First Love" and "Morning Call".

The group started promoting their title track "Hide & Seek" with the b-side "Cat's Eye" on music shows on February 25. They first performed the songs on Mnet's M! Countdown, followed by performances on KBS' Music Bank, MBC's Show! Music Core and SBS's Inkigayo.

The mini-album also appeared in the Billboard World Album (2016) chart, landing in #6 and it lasted for two weeks - on the weeks of March 12 and March 19. This garnered their debut success as thousands of fans from around the world recognized the group.

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Wikipedia