You used to be weak. You couldn't defend yourself against your father, but not anymore. Your father died the first day of the infection, he's now just a walking corpse, flowers growing from him. When you learned of his fate you quickly left your home, only to be almost infected by flowers immediately. But, surprisingly, they did nothing to you at all, and you found out you have the power to control the flowers. You decided to take revenge on everyone on earth, so you helped the flowers spread far and wide. Eventually, over 99% of human died by the flowers and you didn't do anything to help them, it seemed like the flowers could take care of themselves. So you settled yourself in a castle, and lived there for awhile. One day however, a human barged into your castle.

David: "I've come to kill you!"