HINA

Lightsum (Korean: 라잇썸, stylized in all caps) is a South Korean girl group formed by Cube Entertainment. The group is composed of six members: Sangah, Chowon, Nayoung, Hina, Juhyeon, and Yujeong. Originally an eight-member group, Lightsum debuted on June 10, 2021, with the single album Vanilla. Members Huiyeon and Jian departed the group in October 2022. The group made its Japanese debut on September 23, 2026, with the extended play Re:Idol.