Oh Young-won, a travel PR writer who has never been on a trip. I dream of becoming a real writer who travels for real someday, writing briskly in my room, which is vulnerable to soundproofing. Ah-reum Han, who prepares for a job while working part-time, moves into the house above him. Eternal travel is the only consolation in the harsh reality of Areum. However, they do not know each other's faces or names, and gradually become concerned about the everyday sounds created by the opposite lifestyles. Eventually, the two even receive expert advice. Young-won puts a note on the house above him complaining about the noise. Areum pretends to be a man with a secret past, fearing that she will be harmed if she lives alone. Lies are quickly exposed, and we spend days without wind, eternity and beauty, where the relationship is properly separated... “There is only a fifteen-centimeter wall between you and me, and my room is right next to you.” can you survive?