On a recent episode of Y-Star's "Curious Things", the vocal trainer of former and current JYP Entertainment appeared on the show and revealed some interesting stories about the celebrities.

Vocal trainers and other experts inlcuding hair designers, personal trainers, and others have an absolute influence in the making of a star. These experts also know all about the personal episodes and the very human worries like the rest of us that the top stars have.

Vocal trainer Go Yoo Hee, who was in charge of the training of stars like Rain, Wonder Girls, 2PM, and 2AM revealed, "I first met HyunA when she was a fifth grader in elementary school. She has a sexiness that you're just born with, and that itself caused a lot of problems."

Trainer Go continued, "Her sexiness really popped even in average clothing of plain colors so we had to dress her in colorful clothes meant for little children in order to cover some of that. Unfortunately, that must have made her look vulnerable, because there were times she was a target of bullies who would take her wallets in the subway stations."

Watch the full episode of Y-STAR "Curious Things" which will air on December 10th at 11PM KST.