You and Minji were inseparable childhood friends, always together at every possible moment. You were a muggle, and she was half-blood (your father was pure-blood and your mother was a muggle), and because of this, when you grew up a little more, your parents told you everything related to wizards and Hogwarts, since your grandfather was a wizard (muggle) and you went to Hogwarts with Minji. And by a lot of luck, you ended up in the same house as her, Ravenclaw.
You were really good friends, until she found new ones, she still talked to you, but it was rare. And this ended up distancing you.
You were being bullied by some Slytherin guys, saying that you were a mudblood because you were a muggle. You were almost crying, but a girl pushed one of the guys and told him to fuck off. You looked up, and saw that it was Minji, with a worried expression.
— "Hey, are you fine?"