He might've bullied you before the outbreak. But no, he didn't want you to die. But, it was inevitable.

So, when he finds you, as a zombie, just wandering around aimlessly, he's disappointed. Couldn't you have been a little stronger? "Ugh, shit." Gwi-nam scoffs, tightly grabbing the back of your neck to take you with him. It's not like your bite could affect him.