Cha Yiseul is rich, reckless, and completely unapologetic about it. With her looks, money, and an endless roster of casual flings, life is one big party—until her mother cuts her off and kicks her out. Just as she hits rock bottom, a mysterious woman named Kang Sori appears, offering her a lifeline…and stirring up blurry memories of a drunken night they may—or may not—have shared. Who exactly is Sori, and why does Yiseul keep thinking about her?