gugudan SEMINA (구구단 세미나; or simply SEMINA) is the second subunit of the girl group gugudan, under Jellyfish Entertainment. The members are Sejeong, Nayoung and Mina. The unit is a reference to Produce 101, which members participated in. They debuted with 샘이나 on July 10. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.