Han Taehyung was born into a perfectly respectable wizarding family in South Korea. He was raised as any respectable wizarding boy should: taught his letters and his numbers and then sent off to Mahoutokoro for day school when he turned seven. If, at a young age, Taehyung showed an interest in dragons it wasn't really something to be remarked upon. After all, what little boy doesn't dream of dragons?
Taehyung's imagination became a problem in his parents' mind when he turned ten and his fixation still hadn't let up. He'd be going off to board the next year, after all, and his peers already thought him odd. They just didn't want him being bullied when he was away without an escape in the form of home.
They needn't have worried, though: Taehyung was, in fact, perfectly sane and perfectly capable of defending himself from the occasional playground bully. In fact, he was so rash that it was entirely possible he could become the playground bully (he didn't, of course. He was always a very considerate child.) Anyway. Taehyung was never the smartest kid at school, and definitely didn't do his homework anywhere near often enough, but he made up for it with his sheer talent when it came to flying.
Upon graduation, he was snapped up by the Toyohashi Tengu and, eventually, the South Korean National Quidditch Team, where he made a name for himself as a formidable chaser. But Taehyung never gave up on his dreams of dragons, and when he discovered a kindred spirit in teammate Kim Seohyun (another chaser)... well. The two played Quidditch until they were Taehyung was thirty-one and Seohyun twenty-nine, by which point they'd saved enough for their ultimate dream home. A dragon reserve on Jeju Island.
Married by this point, the couple began collecting dragons rescued from traffickers - dragon dealers, as some refer to them. First a few Chinese Fireballs (there are quite a few in Korea, given its proximity to China), then a Peruvian Vipertooth and a Hungarian Horntail. Their reserve grew in size until it contained an incredibly diverse mix of dragons, while also growing in notoriety for the sheer balls its overseers possessed. Only two of them, not even bothering with the proper protections! It was a miracle they survived.
First, they bore a son they named Seungheon and then they adopted a little girl named Sujin and for nearly two years, they lived as a happy yet small family on the dragon reserve. It was only when the two children had begun the basic lessons with dragons that Seohyun figured out she was pregnant with a third child. Nine months later, she bore a little girl by the name of Kyung-Mi. While her brother grew an affinity for fire and Sujin (otherwise known as Cherry) picked up a tapent in singing, Kyung-Mi grew increasingly close to the dragons. In some ways, it was like they were more of her family than her real family but that's not to say she didn't adore her family. She just had a special connection to the dragons around the reserve. She took eagerly to the studies and excelled in dragon taming alongside her siblings.
It was at age five that Kyung-Mi finally showed her magical abilities in an explosive blast which grounded a dragon mid flight and shocked her entire family by the sheer amount of magic displayed. Over the years, Kyung-Mi's interest in dragons grew and expanded to the point that she would search for new and exciting informatiom to learn about them, much like her brother Seungheon With her nose stuck in a book most days, she had little time to make friends outside of her siblings. Following in her siblings footsteps, she attended Mahoutokoro for thr first four years of her education.
During her fourth and final year at Mahoutokoro, Kyung-Mi chose to train to become an animagus and enrolled in lessons that helped her achieve her goals. The first time she ever shifted, she took the form of the rare Antipodean Opaleye dragon - a befitting creature considering the family business. After her brother spent some time at his transfer school in Britain, Kyung-Mi chose to following her brother and adoptive sister, Cherry to Hogwarts. Now about to begin her fifth year, she changed her name to Ariadne Han so that it was easier for English-speakers to pronounce.