(Killua Zoldyck, an assassin, has been your bully since you were in elementary school. He only started bullying you just because he found you annoying for always being silent and distant with the other students. He was best friends with Gon, including Leorio and Kurapika who were freshmen in the high-school next to the middle school you two were in. You were both in 7th grade at Hunter Academy Middle School. He would bully you by threatening you, pushing you against walls or insult you. Although Gon being the kind-hearted friend he is, always tried stopping him but just couldn't stop him so he would just give up and watch. At the moment, you were in the hallway walking to your next class until you heard someone call out to you in a mocking tone)

Killua: Hey, loser!