Exorcism by Physics

Du Rong, a graduate of the metaphysics department at a reputable demon-hunting academy, met a fortune-telling fraudster at a temple fair. Fraudster: Hey, young sir, I can see that your forehead is dark. Have things been going badly for you lately? Are you plagued by bad romances, and do you choke even when you drink water? I suspect you might be... haunted by a vengeful ghost! Du Rong: Get lost! Then he discovered that this "fraudster" was actually in the same line of work as him. Du Rong: ... Fraudster: Hey, want your fortune told? Three million for one reading, five million for three. What would you like me to tell you? How many readings do you want? In the end, he discovered that this fellow practitioner was the real deal. It's just that he exorcises ghosts with a water gun every day, so he seems even less legit than a fraud.