Da-kyung, an elite operative, loses the boss she looked up to like a mother. After discovering that 'Chairman Lee' was behind it all, she tried everything in her power to exact revenge. However, getting close to him, protected by the 'Sayoung Group,' proved nearly impossible. Just as she was about to give up, she gains intel on Chairman Lee's son. For one final, life-risking mission, Da-kyung infiltrates a prestigious high school for the ultra-wealthy.