As the earth's population continues to expand, science and technology advance by leaps and bounds; resource reserves are exhausted. Many immigrant cities have been established on the Earth in space. After half a century of immigration, the Earth has also been warned that it is not easy to live in. There are still unsettled immigrants on the Earth. The "New Earthlings" have cleaned up the Earth in half a century (some governments on the Earth have detonated nuclear bombs), and the cleaning period has passed. The earth has been reoccupied by nature, and governments of various countries have established a "New Earth Government" through agreements. The new government explicitly prohibits "nova people" from going to the earth to communicate with the earth; and has set up an interception system. Anyone who returns to the earth illegally will be shot down directly. Countries have also abolished their armies and formed "planetary law enforcement forces" to be responsible for the daily defense and patrol work of planets. The father of the protagonist Dai Xing, Dai Luo, is one of them. When Dai Xing first entered the army, Dai Luo suffered a malfunction in his cruiser and crashed into the earth, losing contact. Under the influence of his father, Dai Xing yearned for the earth.