4PM plot
Professor Jeong-in could use a year's sabbatical. To spend it in peace, he and his wife Heyon-sook buy a small house in the province, situated on a lake. An initial meeting with the neighbor is the beginning of a nerve-racking series of confrontations that take place every afternoon at four o'clock when the man announces his arrival by knocking on the door. This Yook-nam, a doctor, sits down in a chair and barely says anything. Until he leaves again at six o'clock. What drives this mysterious figure and, more importantly, how do you get rid of him?