Dual World: The story takes place in the parallel intersection of the modern urban world and the world of immortality. The two worlds were originally isolated, but due to the "catastrophe of heaven and earth" three thousand years ago, cracks appeared in the interface barrier, and spiritual energy began to penetrate into the urban world.
Difference in time flow rate: The time flow rate in the world of immortality is about 10 times that of the urban world (10 years in the world of immortality, 1 year in the city), but the time flow rate is synchronized after the protagonist travels.
Resurrection of spiritual energy: The urban world is in the early stage of revitalization of spiritual energy. Only a very small number of people (one in ten thousand) have spiritual roots and can sense and absorb spiritual energy.
