While investigating a series of child kidnappings, police detective Yang Chun Dong stumbles across a mysterious young man spraying a detailed graffiti of one of the crime scenes. But realization hits him too late as the young man is long gone, and even tracking him seems not possible anymore. Acting against the instructions of his superior, Chun Dong is determined to find the man as he suspects him to either be the culprit or an important witness. But who is the stranger really? And why does he want to be left alone?
Both South Korean films are about a mysterious man who possess superhuman powers and is therefore commonly called 'psycho' or 'freak' by outsiders. The main characters evolve through a cat-and-mouse game they play with each other (which lasts longer in Choneungryeokja than in Psychometry).