On April 15, 2021, an intro video was released on LIGHTSUM's social media announcing their name and logo. Later that day, it was revealed that Cube Entertainment was accelerating preparations to debut the group in the first half of the year. On the midnight of April 19, 2021, Sangah and Juhyeon were revealed as the group's first and second members, respectively.
On April 20, Chowon and Jian were revealed as the third and fourth members, respectively. On April 21, Nayoung and Huiyeon were revealed as the fifth and sixth members, respectively. On April 22, Hina and Yujeong were revealed as the seventh and eighth members, respectively.
Finally, on April 23, the group's profile photo was released. On June 10, LIGHTSUM debuted with their first single, "Vanilla". At the time, "Vanilla" broke the record for the highest first-week sales among new girl groups in 2021 until it was surpassed by IVE's "Eleven" in December 2021.
On September 17, LIGHTSUM announced their official fandom name to be "SUMIT". The name means "LIGHTSUM and their fans become one through the medium (it) of LIGHTSUM (sum). " On September 24, a teaser posted via the group's social medias announced they would make their first-ever comeback on October 13 with the single album "Light a Wish".
On this day, the single album, along with its title track "Vivace", was released. On May 6, 2022, LIGHTSUM unveiled three teaser pictures, hinting at a potential comeback. Three days later, a teaser was released for their first mini album Into The Light.
It was released on May 24, 2022. On October 25, 2022 Cube announced that LIGHTSUM would continue as a six-member group following the departures of members Huiyeon and Jian. On May 5, 2023, Star News announced that LIGHTSUM is currently under preparations for a comeback in the first half of 2023.
On September 18, it was announced that they would have their comeback in the second week of October with their second mini album. On September 20, the name of the mini album was later revealed to be Honey or Spice; it was released on October 11, 2023. On July 31, the group released a teaser for their first digital single "Pose!
", set for release on August 7. On March 11, 2025, it was announced that LIGHTSUM will be participating in the survival show A-IDOL. On December 31, 2025, it was announced that members Sangah, Chowon and Juhyeon will release a digital single as a unit, sometime in January 2026.
On January 8, 2026, LIGHTSUM announced the unit's digital single "Beautiful Pain", set for release on January 15.
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