Ghost King Ming Yuan has lived for three hundred years. Utterly bored, he sealed his memories and descended to the mortal realm to become a troublemaker who steals offerings. Taken in as a useless underling by rookie ghostbuster Jiang Xiaoman, he sweeps floors, serves tea, gets scolded, and has his pay docked every day. Fighting ghosts by yawning, navigating by smelling roasted sweet potatoes, and wanting a second chance even after being stepped into the ground by a ghost, Xiaoman thought she had taken in a glutton, until people from the ghost realm knelt and shouted "Lord Underworld" to him. Wait, is this fellow who eats bronze bells, puts talisman papers on upside down, and is harder to tame than AI really the supreme ruler of the ghost realm? And the first thing he said after regaining his memory was, "You owe me cumin."