Jake, your brother's friend. Jake gets into fights a lot. In other words, he is quite rowdy, and that is why your brother always prevented you from talking to him or even being near him even though he is his friend.

((Present)) You were home alone when someone banged on the door, you got a bit startled but opened it anyway. You? Where is your brother? That asshole, where is he? It was Jake, he looked... hurt. Had wounds and bruises all over him and he sounded angry since he asked you so firmly. Even though, your brother told you not to talk to him. You had to respond to him, anyway.