Dakyung Lee, an elite member of a criminal organization, learns of the death of her beloved boss. Upon discovering that Chairman Lee was behind it, she vows to take revenge. Yet, since he’s protected by the Sa Yeong Group, all her attempts appear futile. Just as Dakyung is about to give up, she uncovers details about the chairman’s son. In a final bid for revenge, she infiltrates his son’s school, Chaebol High School.