Sangah

On April 13, 2021, Sangah was revealed as a trainee of the pre-debut team Cube Tree, alongside Chowon and Juhyeon, through a dance practice. On April 19, 2021, Sangah was revealed as the first member of LIGHTSUM. The group debuted on June 10 with their first single "Vanilla".

On May 19, 2023, Sangah was revealed as a contestant on the Mnet reality survival show Queendom Puzzle. The show's first episode premiered on June 13. On July 26, it was revealed that Sangah was among the first five contestants to be eliminated from the show.