I heard that Changsub stood on stage as a backup dancer for 2AM before his debut.

I heard Changsub stood on stage as a backup dancer for 2AM before his debut. Wow...

It's Changseop, who appeared on the KBS program Kkiri Kkiri, and he mentioned it here lol

The fresh behind-the-scenes moments of Changsub, now loved as a top-tier main vocalist

The stories about your trainee days were really surprising and fascinating.

It seems like they usually put most of them on as backup dancers before their debut.