LIGHTSUM released Re:idol, their first Japanese mini album, on September 23, 2026, led by the title track "Doshite." The song had already been put out as a pre-release single a week earlier, on September 16. The record marks the Cube group's Japanese debut, arriving five years after they started out in Korea, and it is their first release aimed primarily at that market.
Each point is a rolling 30-day score ending on that date, sampled weekly. May differ from the window composite above.
LIGHTSUM is a South Korean girl group formed by Cube Entertainment that debuted on June 10, 2021, with the single album "Vanilla." The group originally debuted as an eight-member act and later continued as a six-member lineup of Sangah, Chowon, Nayoung, Hina, Juhyeon, and Yujeong after two members departed in 2022. Several members had prior reality-competition experience, including appearances on Produce 48. The group's name combines "light" and "sum," framing the idea of small sources of light gathering to brighten the world, which informs their generally bright, hopeful concepts. As a fourth-generation group under an established agency, LIGHTSUM has released a series of singles and mini albums while building its fanbase. Their discography spans upbeat dance-pop and brighter concept tracks consistent with their name and image.