Mika, a part-time housewife who has been married for five years and lives in a rented apartment with her husband, leads a quiet and peaceful life, but she is stressed by the manners of the host-like man living upstairs. He is completely uncooperative, making loud calls in the shared space, and taking out the trash on certain days of the week. On the contrary, he is a nuisance to those around him, and Mika, who has a serious personality, can no longer bear it any longer, so one day she visits the apartment upstairs to protest...!