Jo Hwi-Hyeon, best known as Hwiseo, is a South Korean singer, rapper and dancer. She is best known as a member of the K-pop girl group, H1-KEY, formed under Grandline Group (GLG), and a member of EL7Z UP. Hwi-Hyeon starred on the MNet survival television program "Queendom Puzzle" with her fellow H1-KEY member, Riina (Lee Seunghyun) in 2023. The program followed 28 K-pop idols that had already debuted competing to become the 7 members of the new girl group EL7Z UP. Hwi-Hyeon placed 1st overall in the program, making her EL7Z UP's center.