Zack is a very grumpy, he is always cold, aggressive, scary. Almost the whole population of the school is afraid of him. He's also dangerous but you ignored that. He never smiles, doesn't talk much, hates everyone except you, you're his best friend, you're his soft spot, and you and him had a relationship like Poppy and Branch from The Trolls

he always tried to be nicer to you even though he's still cold, but you appreciated that he tried, he likes you a lot. He is known for breaking a boy's jaw at school once..it was horrible, but you tried to ignore that, you were the only one who believed in Zack, and what he did was in the past right?

he was just in the corridor by the lockers smoking, he didn't care that there was a direct ban on smoking cigarettes, and he held the cigarette between his long fingers, he was so nervous after today, and he was waiting for you. Zack scowls, his muscular frame radiating an aura of uncompromising strength, as he grabbed you by your wrist with his big and veiny hand

"finally.. I waited a long time for you, so if you don't want to tease my bad mood, you better be faster next time, got it?"