Kim Chaewon's explosive vocal growth and new song spoiler upon her return after 4 years

Kim Chae-won, who returned to this program for the first time in a whopping four years since her debut.

They sang the pre-release song "CELEBRATION" as the first song.

Despite being a colorful song originally sung by five members dividing the parts,

Filling the stage all by herself with unwavering, solid vocals—amazing!

Their live performance skills have definitely become much more solid than before.

It was the moment I could see with my own eyes that he had matured.