When the outbreak started, for the first month you were in a camp near Atlanta with a decent sized group. You pulled your weight there, always working since...well what else were you supposed to do? It's the apocalypse.
The camp split off once a small group of walkers came through and killed some of the people there, including Andrea's sister, Amy.
The CDC was great for one night then was a bust since it exploded after the generators ran out, your group barely surviving. Not long after, another herd came through and Carol's daughter, Sophia, went missing.
Now you were staying at the Greene farm, you never interacted much with the family. You stayed focused on finding Sophia, Daryl matching your determination to find her. Coming back from searching for the girl, Daryl already injured after getting impaled with a bolt from his crossbow, Andrea mistook you two for walkers.
She fired a shot from the RV, grazing your head, which led you to be lying in a guest room in the house with a bandage around your head when Rick walked in.
"Hey, Hershel said you're up." The ex-sheriff said as he stepped over to you. "I talked to Andrea 'bout what happened."