Lightsum
Official fandom · SUMIT
Debut 2021 · Cube Entertainment
About
- Name origin
- LIGHTSUM combines 'light' and 'sum,' symbolizing small shining lights gathering together to light up the world and deliver greater positive energy through a message of hope.
- Formation
- Cube Entertainment's first new girl group since (G)I-DLE, LIGHTSUM debuted on June 10, 2021 with the single album Vanilla as an eight-member group; several members had prior survival-show exposure on Produce 48 and The Unit. On October 25, 2022, Huiyeon and Jian departed and the group continued as six members, returning as a sextet with Honey or Spice in October 2023 and making their Japanese debut with Re:idol in September 2026.
- Why fans love them
- Fans love LIGHTSUM for bright, high-energy performances, stable live vocals during sharp choreography, and a hopeful, feel-good sound — from the bubbly debut 'Vanilla' to the confident 'Honey or Spice' and the kawaii-styled Japanese reinvention 'Doshite.' Their persistence through a long hiatus and a full-group return in 2026 has kept their fandom, SUMIT, closely bonded to the six members.
Members
- Sangah · Leader, Main Rapper, Lead DancerYoon Sang-ahBorn 09-04-2002Ganseok-dong, Namdong-gu, Incheon, South Korea167 cm (5'6")
- Chowon · Main VocalistHan Cho-wonBorn 09-16-2002Eunpyeong-gu, Seoul, South Korea168 cm (5'6")
- Nayoung · Main Vocalist, Lead Dancer, CenterKim Na-youngBorn 11-30-2002Chuncheon, Gangwon-do, South Korea155 cm (5'1")
- Hina · Sub VocalistNagai HinaBorn 04-07-2003Kanagawa Prefecture, Japan159.6 cm (5'3")
- Juhyeon · Main Dancer, Lead VocalistLee Ju-hyeonBorn 04-08-2004Seoul, South Korea172 cm (5'8")
- Yujeong · Sub Vocalist, MaknaeLee Yu-jeongBorn 06-14-2004Seoul, South Korea162 cm (5'4")
Hit songs
LIGHTSUM's debut single, released June 10, 2021 — a bright, bubbly teen-pop dance track about stepping toward the stage of one's dreams.
Why it hit: Set a 2021 record for first-week sales among newly debuted girl groups and passed 2.5 million music video views within 18 hours of release.
The title track of the second single album Light a Wish (2021), a future-bass and house song with harmonious synths and a dreamy, mysterious mood.
Why it hit: The group's first comeback title track, it showed a more polished, synth-driven side and remains one of their most-streamed early songs.
The Korean-language version of the title track of LIGHTSUM's Japanese debut mini album Re:idol (2026), a cute, catchy song about the fluttering feeling of a one-sided crush.
Why it hit: The group's first full-group Korean release in about two years, performed on M Countdown on October 22, 2026, marking their return to full-group activity in Korea.
Official links
Upcoming concerts
Live · 0 shows
No upcoming concerts found for Lightsum right now. Check back after the next tour announcement.