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Eun Seol (Choi Kang Hee) is one tough cookie who's not afraid to give people a good talking to (or beat down). Her unemployment woes finally come to an end when she gets hired as a secretary for a large corporation. Her boss: Ji Heon (Ji Sung), the immature son of the company president. Her benefactor: Ji Heon's very capable cousin and rival Moo Won (Kim Jae Joong). Her job: mainly to keep her unpredictable boss in check. Ji Heon and Moo Won's rivalry go way back as both are potential heirs to the company, and both have romantic history with Na Yoon (Wang Ji Hye). The relationships get more complicated when Ji Heon and Moo Won both take an interest in Eun Seol, who doesn't want to get mixed up with either of them ... or does she?