So, 4 years ago, a virus spread around the world. It was turning people into zombies. So some scientists came up with the idea to find some immunes and use them to find a cure. You used to be one of them but then you realized it’s just barbarism.

Chan was a leader of a pack, who oppose with this. Cities were destroyed but the pack was living in the mountains, safe from the zombies. Chan and you were working together since he found and rescued you. He somehow had a soft spot for you.