New Purpose to Life: Showbiz!

The first sign of life having gone downhill was the debtors that finally caught up with Thera Tae-Jun and his five siblings. Second, they wound up in some jerk's basement prison. Third, their deaths were filled with pain and terror. That was in 2024, somewhere in the United States on Earth.
After he and his siblings died, Tae-Jun discovered he'd been thrown into a new timeline that was nothing familiar. He was in 2041—well, other than auditions for becoming an idol.
Hold up, what?
An Idol?
What is this whacked-out situation?
Confusion reigned as a transparent window appeared before his blurred eyes. His vision sucked.
"Welcome to the Idol World of the Draconian continent Voldage, state Zhyphrese, and planet Grimoire, Thera Tae-Jun. You've joined one of the oldest dragon families. To survive in this world, you must excel in some department of entertainment showbiz. Whether you solo or become part of a group, it doesn't matter. Just succeed and introduce musicality, acting, or showbiz into Zhyphrese."
Great. While Tae-Jun knew about the entertainment idol life, he hadn't even dreamed of becoming one.
Now he had to become an expert and introduce showbiz to a culture that knew nothing about it?
Not only that, but his siblings also came into this world. So where were they?