Kim Bongsoon and Song Junpyo were arranged to be wed since they were infants. Because both were pure-bloods and they're families wanted to continue their pure lineage, they never had a choice. At 19, Junpyo had mistakenly fallen for a muggle, who he wanted to run away with. His parents caught wind of the affair, and met with the girl. The next day, she told Junpyo that she didn't love him anymore and moved away. He never saw his love again. The next year, he married Bongsoon. Bongsoon knew what her duty was. She knew she had to be with Junpyo. She never questioned that. Resented him maybe, but she never questioned it. Needless to say, neither individual was particularly happy about the marriage, but they knew their place.
A year after the two married and settled down in Asan, they had a baby boy named Yijung. They treated him way too harshly, harping on him about any and everything. He was the only boy and the oldest. So when his younger sister's came along, their parents barely put any pressure on them. Sure, it'd be nice if they married pureblood from wealthy families, but if not, it wasn't the end of the world.
First came Mijung, and a year later Jakyung. Mijung was raised like a princess almost. The family wasn't wealthy, but she and her sister were still treated like a treasure. Unlike Yijung, their parents loved the girls unconditionally. It was hard for Mijung growing up and seeing the way her brother got treated. She pointed it out too. All the time. But anytime she'd try discussing it, her parents would shut it down.
When Mijung was six, she had enough of her parents yelling at Yijung. He made a B on a test instead of an A, and they were chastising him. Mijung was angry. She didn't fully understand the situation, seeing as she was still young, but she knew her brother was upset. But maybe if her parents were upset with her, they'd stop yelling at Yijung. It was at that moment that her mother's china cabinet came crashing down with a single glare. Instead of being angry though, they were just excited that she could use magic. At least they stopped yelling at her brother.
At eleven, Mijung chose to study at Hogwarts instead of Mahoutokoro, staying with Yijung in Lincliff. She also began learning from her brother how to play piano and even how to mix and create tracks. She was her own mini producer. Unlike Yijung, Mijung didn't sound like a dying cat when she sang. She was actually pretty good. At thirteen, she auditioned for a trainee position at Silencio and she's been there for about a year. She's still learning from Nasa and her coaches at Silencio and is getting better at music everyday.