The Chong family were a vast line of proud pure-blood wizards spread across Asia. They had no time for mortals, believing them to be weak and stupid, so they would scorn them and ignore them. The Chongs were spread across the region, practicing traditions and expanding their family. The line had high and goals and one of the goals was to expand all over the planet. In the 1970s, the family joined a small wizard movement towards Europe, in hope for a better education for their future kin, benefitting both their dream and education. The Chong family left Korea and moved to Europe attending schools there. But, of course, there were family members left behind.
Sera Chong, unlike the rest of her family, was simply fascinated with Muggles. She would start up conversations with them in public and learn to use their objects. Sera was so fascinated in this Muggle life that one day, sitting in a local bar which was far from her family's manor so she wouldn't get caught, she found herself flirting with a Muggle by the name of Woo-Hyun. They exchanged numbers so Sera could talk to him on the phone, which she taught herself to operate. The couple went around, meeting in secret, with Woo-Hyun believing they were meeting in secret because of an overprotective brother. Soon, Sera was pregnant.
When Sera confirmed she was pregnant, she told Woo-Hyun and then left him, not saying anything else. She got to the manor and confessed about the pregnancy to her mother, whom rejoiced. Sera left out the details on what the father's blood was, though. The following night came a celebration of the family at the manor, which involved family members in Korea and pure-blood family friends. Joy for the pregnancy filled the room, but also quiet talk on the father of the baby. Rumours were spread, but they were all kept quiet when Sera announced that the father was a Pure-Blood whom she met at a Quidditch match and whom she has been talking with and meeting since. He wasn't able to be with her though because he travels the globe frequently and isn't looking for a settling relationship but he was rejoiced at the news of a child. Sera's story was understood by the rest of the family and they carried on with their party.
After nine months, Sera gave birth to healthy baby girl who was named Ji-Sook Chong, after a relative who'd passed away a few months before. The family loved the baby and some of the uncles had started to take bets on what future job in the Wizarding World the child would have when she got older; some bet Healer, others bet Auror, the usual thing the family does when a new child is introduced.
As the child grew, so did skepticism on the father of Ji-Sook. The other members of the family were skeptical of the father, since he hadn't visited ever during the pregnancy and there has been no word of him since Ji-Sook was born. Sera became nervous and covered up the suspicions with a simple cover-up explaining that he was busy with his work and that he sends letters by owl every week. Then before they could ask to see the letters, she would suddenly have a new task to do and would leave to go do it.
The family wanted a visit from the father of Ji-Sook and so a visit from Woo-Hyun came. When Ji-Sook was but three, Woo-Hyun visited the family manor in Ulsan where Sera lived with her mother, sisters, and father. He had tracked her down and wanted to see his child. The family didn't react well to the news of a muggle father. Sera's mother slammed the door on Woo-Hyun's face and called the family for a meeting in the living room and told them the news. They yelled at Sera and used magic to immediately pack her things. The family told her to find a new place among the "muggle" world, they told her that she would be disowned soon, which was made official several months later. The rest of the Chong family in Korea left for Britain.
After Sera was kicked out, she headed for Woo-Hyun, whom was staying at a nearby inn. Sera confessed her troubles to Woo-Hyun while leaving out what she was. The muggle comforted her and the next day, took her and Ji-Sook to a town outside of Seoul where he had moved to and now lived. Sera spent sometime there, trying to gather herself up. She had no job, no money, no home and she had a child to take care of. Woo-Hyun treated them well and everyday he would go to his job in the city where he was a journalist. After spending time thinking, however, Sera decided to tell Woo-Hyun the truth. So one day, when he came back from work, she sat him down while Ji-Sook played in the corner and told him the truth about everything.
Woo-Hyun was surprised and took it shockingly well, much to Sera's astonishment. But, of course, she wasn't surprised went he was gone the next day.
Woo-Hyun had left a letter explaining how it wouldn't work and that he was needed somewhere else. He also said that he understood her situation and paid off the house and set it under her name, and also left her check that would go into savings for Ji-Sook's future. Sera was disheartened.
The love for Woo-Hyun was strong in Sera's heart, extremely strong. As Ji-Sook grew up, Sera became obsessed with the idea to turn herself into a Muggle completely. She started to get into darker magic, trying out crazy experiments and even making her young daughter her reluctant assistant in these matters. Sera had even made Ji watch while she harmed herself. This gave Ji-Sook nightmares which haunted her for years.
Ji-Sook was seven years old when her mother left her. She had woken up that day and went to her mother's room where a vacant room was awaiting. Ji-Sook figured she'd just gone for a walk and made herself breakfast and then went to sit on a chair and wait for her mother. Sera had tracked down Woo-Hyun and went to see him. Woo-Hyun, however, had moved on in the time period and got married to a woman, having a baby girl as well. Sera, driven mad from the dark magic and the sadness, took herself to the nearest bridge jumped off it, killing herself.
It was about a few months before the neighbors started to grow skeptical of the house where Ji-Sook lived. No one ever went in or went out, developing suspicions. After a while, the neighbors got worried and called the police. They got into the house and found Ji-Sook sitting quietly at the dining table. She had been rationing on the food, becoming ridiculously skinny. Over the days, she had made herself food and then sat in the same chair all day, over and over, waiting for her mother to come home.
The officials couldn't find any document stating who the child was and Ji-Sook didn't speak at all, unwilling to give herself away. The officials gave Ji-Sook over to foster care, where she stayed with a few children varied between the ages, while they tried to find out who she was. Soon, the officials found Woo-Hyun's check which he made for Ji-Sook's future all those years ago. They found only her last name, though, and Woo-Hyun's name and tracked his bank account to him. He didn't take her in and he didn't want her. Woo-Hyun lied, saying that he had relation to her whatsoever, it was only a donation to the struggling family. The officials went to the Chong family, whom also didn't want her, saying that they had disowned her mother and her.
Ji-Sook was placed in an orphanage where she had no friends. When she was about to turn nine, a caring Muggle family from England adopted her. She was blank about the events as if she didn't really care, but in truth it was just a blur for her. As they didn't know her first name, the Muggle family, whose names were the Carters, named her Maddy. The family returned to England with Maddy.
The Carter household cared for Maddy with their entire heart and Maddy was grateful, though she knew she didn't show enough gratitude. She did have a difficult time in England, however, as she had no previous knowledge of the English knowledge. The family hired a tutor for her and she started to learn basic English. As she grew older, her magic became stronger, and soon the Muggles became aware of Maddy. The girl mustered up everything she knew about Wizarding World and told them. The family accepted it eagerly and lovingly, telling Maddy that they will support her no matter what. When she was 11, she got her letter to Hogwarts.