They are not black and white, although their duty is to guide ghosts into the underworld.
They are very powerful, but sometimes they make mistakes.
A long-planned mistake brought a ghost halfway to hell back to earth.
From then on, this lucky man had the extraordinary ability to travel freely between the Yin and Yang Realms, and became a tool used by the major forces in the two realms.
Trouble and surprises ensue.
Love encounters and adventures ensue.
What awaits him is endless lingering, life and death, and ups and downs.
And the love and hatred between humans and ghosts.
