Gahyun

On December 5, 2016, Gahyun was revealed as the seventh member of Dreamcatcher. The group officially debuted on January 13, 2017 with their first single album "Nightmare". On July 21, 2024, Dreamcatcher Company announced that she would change the romanization of her name to Gahyun.

On March 10, 2025, Dreamcatcher Company announced that members Handong, Dami, and Gahyun's exclusive contracts are set to expire on March 31 and all three elected to not renew. However, the company clarified that the group will keep promoting as seven. 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.