2017: GOOD DAY, The Unit
On July 10, 2017, she was announced as a member of C9 Entertainment's newest girl group GOOD DAY. They debuted on August 30, 2017, with their first mini album All Day Good Day.
Later that year, she became a contestant on KBS 2TV's reality survival show The Unit. She was eliminated in the episode 7 after ranking 57th place.
On November 12, 2019, Chaesol was introduced as a member of C9 Entertainment's next girl group, Cignature.
|Chaesol • Jee Won • Ye Ah • Sunn • Seline • Belle • Semi|
|Digital Singles||"Nun Nu Nan Na" • "ASSA"|
|Concerts||Debut Showcase 'Cignature Move'|
|Youtube Series||Cignature Move • Cignature Piece • Cignature Special|
|Videos||Performances • Music Videos • Teasers • Dance Videos|