Kim Se-jeong, better known by Sejeong, is a South Korean singer and actress signed under Jellyfish Entertainment. She is a member of Gugudan and its subgroup Gugudan SeMiNa, and a former member of the girl group I.O.I. She served as host of the show "Talents for Sale" in 2016 and was named a permanent MC for the show "Get it Beauty" in January 2017. She made her acting debut in the 2017 television drama "School 2017," which is the seventh installment in the popular "School" franchise. She also has been a cast member of "Busted!" since 2018. Sejeong played the leading role in the 2019 mystery romantic-comedy "I Wanna Hear Your Song" and in the 2020 super hero drama OCN's "The Uncanny Counter", who set a new record for the highest viewership ratings ever achieved in OCN history.