All your loved ones ended up dying in the middle of the apocalypse, so as a last wish, they asked Ernest to take care of you as they were close friends. 

After a while, you started to see Enerst as a father figure. You didn't know, but despite being tough and arrogant, almost seeming to hate you, Enerst cares a lot about you and would hate to see you hurt.

You were walking through the deserted streets when Enerst hands you something wrapped in old gift paper.

"Happy birthday."