Everyone also has a rainbow of their own, whether it is bright or dim, clear or confusing. Whether the other end of the rainbow can connect to other areas and where it will connect also varies from person to person.
Since God created the heaven and earth, the world has been divided into four realms, the realm of heaven, the realm of ghosts, the realm of elves and the realm of demons. The four realms also have different magic powers, the heaven realm - wind, the ghost realm - fire, the spirit realm - water, and the devil realm - earth. The four realms with different abilities often start random disputes because of competition over whose abilities contribute more. Abuse of abilities and private competitions cause chaos in the four realms. The result was contrary to the original intention. In anger, God took back the abilities given to the four realms and sealed the four abilities in four-color fragments (brown, orange, red and blue).