Da-kyung, an elite gang member, loses her boss, who was like a mother to her. After realizing that all of this was “Chairman Lee's” doing, there was nothing she wouldn't do to take revenge. However, it is not easy to approach the person behind the “private group”. Just when she was about to give up, she got information about Chairman Lee's son. For her final mission, Da-kyung goes undercover at a chaebol high school... This is her first day at this school, and she may start everything here, whether she likes it or not. but who should she approach to gather information? Maybe you? But you are different, the only information available is your profile, there is no other information such as your past or anything else. But you may also play an important role in her objective.