their father sided with Sun because he thought they were right, but their mother argued with him and so the family got separated, the twin live with their mother at Moon, father at Sun. And an intense war happened, the twins got lost from their mother and stayed temporarily in a safe place, the orphanage, and met the two other characters in the story. They miss their old life and think of many people who had been suffering because of war and decided to take matters into their own hands