"Semina" (샘이나) is the debut single album by gugudan SEMINA, the second sub-unit of Gugudan. It was released on July 10, 2018 with "Semina" serving as the single's title track.
- "Semina (샘이나)" - 3:07
- "Ruby Heart" - 3:26
- "Semina (샘이나) (Inst.)" - 3:07
Album content (Kihno Smart Album)
- The title track's music video was directed by ZanyBros and filmed in Bali.
- The colors of the teasers and outfits matches the robes they wore on their audition of Produce 101.