Born in a year and month steeped in yin, Cheng Yi was abandoned and raised by a sect of Daoists. On the night he turned eighteen, The Record of a Hundred Ghosts awakened. Capture one ghost, and he gains a year of life and a boost in cultivation.
His first job after descending the mountain is for a wealthy family: a vengeful ghost burdened by a blood debt is being kept inside a jade pendant, and the young lady's life hangs by a thread. He says capturing the ghost is easy, but saving her life is not. Her illness remains uncured, so she has no choice but to follow him.
Another group captures ghosts too, but refines them into fuel, intent on burning their way to a Ghost King and overthrowing the Daoist tradition.
He can tell good ghosts from evil ones, but not good people from bad. He knows how to use talismans, but not bank cards.
In the modern city, ghosts lurk in the shadows. He arrives with an old book on his back, ready to capture ghosts first, then take on this whole world.