Gugudan (Hangul: 구구단) is a South Korean girl group under Jellyfish Entertainment. The group currently consists of 8 members: Mimi, Hana, Haebin, Nayoung, Sejeong, Sally, Soyee and Mina. They debuted on June 28, 2016 with their 1st mini album Act.1 The Little Mermaid. Former member, Hyeyeon, announced her departure on October 25, 2018.