洪乐瑥（金裕贞 饰）女扮男装化名洪三郎，靠着替人撰写情书牵线搭桥维持生计。某日，一个偶然的失误令洪乐瑥惹上了一大堆的麻烦，不仅欠下巨额债务，还身处于危险之中，与此同时，洪乐瑥结识了名为李韺（朴宝剑 饰）的书生，话不投机的两人之间因为种种误会而产生了诸多矛盾。 机遇巧合之下，洪乐瑥入宫成为了內侍，可是，让她没有想到的是，她竟然在宫中和李韺重逢了，原来，此人的真实身份竟然是高贵的王世子，而李韺为了替妹妹讨一口气，遂决定将洪乐瑥留在身边，想好好作弄作弄她。随着时间的推移，洪乐瑥和李韺患难与共，彼此之间竟然生成了真挚的感情，李韺再也无法无视内心里的悸动，而此时的他还并不知和自己朝夕相处的洪乐瑥，竟然是女儿身。
When high school teacher Na Aejoon shows up for work on an ordinary day, he never expects to bump into his favorite celebrity in the hallway. But when his school becomes a filming location for a show starring Choi Siyeol, his bias from the idol group A-One, that's exactly what happens! If that's not enough to give a fanboy a heart attack, Siyeol takes an interest in Aejoon and asks him to join the show as his "co-teacher." Desperate to keep his fan life a secret, Aejoon is forced to put his acting skills to the test, and not just on camera. But as he spends more and more time with Siyeol, the deception becomes harder to keep up. Not to mention, he might not be the only one keeping secrets…
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十二名选手在这场智力与技巧的较量中争夺桂冠。联盟形成，秘密游戏出现——任何人都有机会获胜。
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