Once the members received their advice from the vocal trainer, Jang Jin Young recalled his early idol day,s having debuted in popular boy group Black Beat fifteen years ago.
The vocal trainer demonstrated his dancing skills upon the members' requests. "Pardon?" he stalled, embarrassed by the sudden suggestion.
"I don't remember the exact choreography..." he continued, then got up and danced to the music, making the members squeal as they watched their instructor present his hidden card.
Check out the vocal trainer's early days below!