Na Jung-sun (Jang Na-Ra) lived an enviable life, with a glamorous job serving VIP customers of a department store. She is married to Park Sung-Joon (Lee Sang-Yoon), an apparently perfect husband, and a man with great skills, opportunities and ambition, who heads the department where they both work. She had never doubted the strength of her marriage, until she receives an anonymous text message that her husband is having an affair. The text not only makes her suspicious of her husband, but also of the women in her office. Confidence is fragile, and Na Jung-sun's appeared to be even more than she even suspected, enough to crack with just a text message.