If the entire space like the universe is called a "universe world", then thousands of "universe worlds" form a broader space called "boundary space". In the "boundary space", even the universe is as small as a grain of sand. Among the thousands of "spaces", there is a "space" called "Nightmare". The people living here are as powerful as nightmares, giving people a feeling of being untouchable. This novel uses the person of dream to tell the story of how a young man who once committed a heinous crime finally changed his "nightmare", changed all "realms", and became the god of billions of worlds.