When Hyun-seung (Ji Sung) hears the news that his ex-girlfriend is going out with the perfect man, his lonely nights turn restless. Then a sudden phone call breathes a new life into his somber spirit. In order to revitalize her long-term relationship with her boyfriend, Yoon-jung resorts up with the dirty talk, being as sexy and arousing as possible. Trouble is the man on the other end of the line isn't her boyfriend. A new relationship is formed with one wrong but fortunate call.