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Eun-ah is a woman who disguises herself as a man in order to earn a living as hired protection. When she by chance saves a young nobleman from being robbed by some crooks, she quickly learns that the young nobleman was actually the Crown Prince of Joseon, and he wants none other than for her to be his personal bodyguard! Trouble is, no one in the palace, least of all the crown prince, knows she's a woman, so she has to keep pretending to be a man...