A child who doesn't know what his parents look like, a little girl who doesn't know how high the sky is, doesn't know the sinister nature of society, doesn't know how to face the future, and doesn't know anything. In her words: the whole world is gray.
Two girls, with a hatred that they will never forget even after hundreds of years, they hurt each other to death. But in a strange environment, they must have their own thinking ability, and they must bear corresponding responsibilities for whatever they do. They grow up overnight. . .