Hyungseo

She debuted as a member of Busters on November 27, 2017 with the group's first single "Dream On". On March 29, 2020, she posted a letter on their fancafe announcing that she was leaving the group to focus on her studies. On September 8, Hyungseo was featured in the trailer for the show My Teenage Girl, confirming her participation.

For the entrance exam she performed "LATATA" by (G)I-DLE and she received enough votes from the judges to pass. In the finale, she ranked 3rd overall, making her a member of the girl group CLASS:y. They debuted on May 5, 2022 with the mini album Class Is Over.