Yoon Sang-ah

상아 • 윤상아 • Sangah • Yun Sang-a • Сана • LIGHTSUM

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-piece ensemble, members Huiyeon and Jian departed the group in October 2022. The group debuted on June 10, 2021, with the release of their debut single album, Vanilla. Name The grou...

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-piece ensemble, members Huiyeon and Jian departed the group in October 2022. The group debuted on June 10, 2021, with the release of their debut single album, Vanilla. Name The group's name, Lightsum, is a combination of the words "light" and "sum", which symbolizes "things that shine small gather together to light up the world, delivering greater positive energy through a message of hope". History 2017–2020: Pre-debut activities Juhyeon participated in The Unit: Idol Rebooting Project in 2017–2018 where she finished in 25th place. Chowon, Nayoung, and Yujeong participated in Produce 48 in 2018 where they finished in 13th place, 21st place, and 51st place respectively. However, in 2019, it was later revealed that Chowon's real ranking was 6th place, which would have put her in the lineup of Iz*One. Juhyeon later participated in Dancing High in 2018, but did not pass the evaluation round. Chowon was cast in Bully Bad Guys and The Dominator 3: Junior Bullies in 2020. 2021–present: Introduction, debut with Vanilla, Into the Light, and members departure On April 15, 2021, Cube Entertainment announced that it would be debuting a new girl group, their first since (G)I-dle in 2018. The members were revealed in pairs from April 19 to 22 (in order: Juhyeon, Sangah, Chowon, Jian, Nayoung, Huiyeon, Hina, and Yujeong). A video trailer with all eight members was revealed on April 23, 2021. On May 27, it was announced that Lightsum would release their debut single album Vanilla on June 10, making their broadcast debut on Mnet's M Countdown with a performance of their debut single. On October 13, Lightsum released their second single album Light a Wish, with "Vivace" serving as the lead single. On May 24, 2022, Lightsum released their first extended play Into the Light, with the lead single "Alive". On October 25, Cube Entertainment announced the departure of members Huiyeon and Jian from the group and that Lightsum would be reorganized as a group of six. On May 5, 2023, it was reported that Lightsum is currently under preparations for a comeback in the first half of 2023. On June 7, Sangah participated in Mnet's girl group survival show Queendom Puzzle as a contestant. she was eliminated in the first elimination rounds. On September 18, it was announced that they would have their comeback in the second week of October with their second extended play. On September 21, it was announced that Lightsum would release their second EP Honey or Spice on October 11. On October 11, the group made their comeback after 1 year and 5 months with the release of their second EP "Honey or Spice", along with its lead single as the same name. On July 31, 2024, the group released a teaser for their first digital single "Pose!", set for release on August 7. On August 3, the group released a concept photos for the digital single. On August 7, Lightsum released the digital single "Pose!" 10 months after their previous comeback. On January 15, 2026, a sub-unit release titled "Beautiful Pain" with members Sangah, Chowon, and Juhyeon was released. This is a remake version of BtoB's version released in 2018. Members Timeline Discography Extended plays Single albums Singles Videography Music videos Awards and nominations References External links Official website (in Korean)