Yeonwoo, the heir of the biggest gang in the country, dresses as a boy to go undercover in a boys' school to get rid of the heir of her competing gang. But there is a group of three cute boys that show interest in her from the first day, and Yeonwoo's life starts to fill with romance. But finding out that one of the three is the heir, she fights between love and her mission to kill him.

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