Hwiseo

On June 14, 2022, Hwiseo was introduced as a new member of the group H1-KEY with teaser photos for their first maxi single "Run". On April 24, 2023, it was reported that Hwiseo, alongside Riina, would be partaking in the survival show Queendom Puzzle as contestants. On August 15, it was announced that Hwiseo had finished in 1st place and would be joining project group EL7Z UP.

They debuted on September 14 with their first mini album 7+Up. EL7Z UP is assumed to have disbanded in 2024.