Lee Yoon-Sung (Lee Min-Ho) works at the Blue House's National Communication Network Team and received his Ph.D at M.I.T.. Kim Na-Na (Park Min-Young) is a bodyguard at the South Korean president's residence, the Blue House. Na-Na lost her parents by car accident and since then she made a living by doing part time jobs. She became a bodyguard at the Blue House and she falls in love with Lee Yoon-Sung.
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