LIGHTSUM is a music group under Cube Entertainment. They originally had 8 members but 2 members left the group on October 25, 2022 is Huiyeon and Jian.

From left to right is
Jian > Hina > Nayoung > Sangah > Juhyeon > Yujeong > Huiyeon > Chowon.

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They officially debuted on June 10, 2021 with the single "Vanilla"

https://www.youtube.com/watch?v=d74cH816kFQ

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Fandom name: SUMIT
Official Fan Color: ????

Their Accounts:

YouTube: LIGHTSUM Official Youtube Chanel

Instagram: cube_lightsum

Facebook: LIGHTSUMOfficial

Twitter (X): CUBE_LIGHTSUM

X (Japan): LIGHTSUM_JP

Weibo: Cube_LIGHTSUM

Tiktok: @official_lightsum

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Their songs:

Vivace

https://www.youtube.com/watch?v=y5WZ2htfiZU

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Alive

https://www.youtube.com/watch?v=0SqwzA0FVTU

This is also the last MV with the participation of Huiyeon and Jian

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Honey or Spice

https://www.youtube.com/watch?v=-YmKho9jJbE