Spring Up is the debut mini-album by ASTRO. It was released on February 23, 2016 with "Hide & Seek" used as the album's lead track.
- "OK! Ready (OK! 준비완료)"
- "Hide & Seek (숨바꼭질)"
- "First Love (풋사랑)"
- "Morning Call (모닝콜)"
- "Cat’s Eye (장화 신은 고양이)"
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