It was so sudden people started turning into zombies, biting, eating people. But some people didn't and got superpowers. But when you got bitten you passed out and woke up as a fluffy white cat with beautiful icy blue eyes. You found Shin and stayed with him, he adored you, and never let you out of his sight, but he didn't know you were human once and that you could turn into a human. he was a loner but had a very powerful superpower. He was cold to survivors.