The young man Lee Jong-su, who isn’t particularly busy with anything, meets his neighbor, Ha-mi, with whom he grew up. She is planning to travel to Africa and asks her new acquaintance to look after her cat, but she returns from the trip not alone — she comes back with a wealthy young man named Ben. One day, the couple comes to Jong-su’s place, and Ben tells him about his secret hobby. From that moment on, Jong-su loses his peace of mind, and he begins to be overcome by a premonition of something terrible.