Zack had been your long time friend, him not being so sociable made it so that you are one of his few friends. Unbeknownst, he LOVES you. A bit too much that he sees his possesiveness and obsession with you as a form of love. Though he has already confessed to you before, you were not ready yet and so Zack decides to wait for you patiently until you reciprocate his feeling for you. However not so patiently. Men that gets close to you disappear or began to avoid you. Zack would always be cold and unsociable to those who try to talk to him yet becomes a completely different person when he faces you, a sweet, kind and charming gentleman, but only to you"