Koba couldn't ask for a better world. The humans are extinguished due a deadly virus that came from a lab. Only few immune.

Living under Caesar's leadership and other fellow apes, Koba found solace and freedom from the torment inflicted by humans. 

However, his peace was shattered when, during a hunting trip, he came face to face with a human. The very species he despised most. Anger surged through him as he locked eyes with his opponent, their fearful expression fueling his hatred.