Once Upon A Time is the debut mini-album by Unicorn. It was released on September 3, 2015 with "Huk" as the lead track for the album.
- "Intro" - 0:22
- "Huk (헉)" - 3:10
- "I Can't Take It (못참겠어)" - 4:03
- "Step by Step" - 3:18
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