Seven days of adventure in an apartment building. A quiet middle-class apartment is the scene. Yoon Ju is a college lecturer with plenty of time on his hands. He gets annoyed at the sound of barking and tries to find out where it's coming from. By coincidence, he discovers a dog in front of his neighbor's door. He feels instinctively that it was the culprit and kidnaps the dog to lock it in the basement. On another front, Hyun Nam, a secretary in the apartment superintendent's office, is bored to tears with her uneventful life. The same day, she is passing the time with a crossword puzzle when a little girl comes in with a notice for a lost dog. Hyun Nam, suddenly animated, starts putting up notices all over the neighborhood without being asked. However, more and more dogs start disappearing. Then one day, Hyun Nam gets a pair of binoculars from her friend at a local store. She goes up on the apartment roof and witnesses a man killing a dog on the rooftop across from her.