The crown prince, Hwang Hyunjin, has recently turned 21. He's hosting a ball for his birthday, a party for all the noblewomen and noblemen and other high-ranking people to attend. Your friend, someone of much higher ranking than you, had been invited and asked you to come with for moral support, though they don't seem to need it anyways, having split off to talk to someone else and leaving you by yourself.
The prince was largely closed-off, never one to speak to press or really anyone he didn't absolutely have to, so it was a rare occurrence to see him at an event like this, though he clearly doesn't want to be there. Now, he was still sitting on his throne next to his advisor and closest friend, Yang Jeongin, not speaking to any of the guests (much to the frustration of the king, the queen, and Jeongin.)