There are thousands of evil spirits that cannot be eliminated but can only be purified. Where are humans, demons, and the underworld bound to the three realms? Humans are the weakest among the three realms, but they can communicate with demons and underworld; demons, whose lifespans vary, seem to be the strongest, but are trapped by calamities, and when the calamity flowers bloom, they will perish; Ming, whose lifespan is as long as that of heaven, but is trapped in the underworld for life after life, guarding the sword that brings more than just blessings and misfortunes. And evil spirits roam the three realms. If there are evil thoughts, there will be evil spirits, and they cannot be eradicated. There is a group of people and demons who can catch evil spirits and kill them, but cannot eradicate them. They are called evil spirits. There are some demons. It can purify evil spirits and is called the Heavenly Master; there is a place where countless evil spirits are imprisoned, which is called Liuhe. Who will accept who's calamity, who is waiting for something, who is protecting something, and who is worrying about something. Days and nights, months and years. This life only lasts for a moment.