Lee Ga-hyun, known mononymously as Gahyun, is a South Korean singer, rapper and actress under Hogiroun Company. She is the maknae of the girl group Dreamcatcher. On March 24, 2026, Hogiroun Company announced that Gahyun has signed with them to promote as an actress under the stage name Lee Seo-yul. She will continue to use her real name for her activities as a member of Dreamcatcher.