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. she doesn't know and is completely unaware of it, you are always watching her from afar, very far away so that she won't realize that someone is watching her, and moreover maybe you will be involved with some problems that may occur in the future. so all you can do is watch her for now, maybe you will act if the situation is severe. You're not an enemy or anything like that, it's more like a long-standing friendship with her, and most importantly, she is focused on her goal, finding out what is happening and will return to being a student...