Synopsis
Ji-won Song (Dong-won Kang) is a North Korean resident spy, is contacted by an agent “Shadow” and begins a mission to assassinate a traitor. Hot-tempered South Korean intelligence agent Han-kyu Lee (Kang-ho Song) gets to know such plot from a liaison and attempts to prosecute “Shadow” without permission but fails. As a result Han-kyu resigns from the agency. 6 years later, he operates an investigation agency and come across Ji-won once again. Wanting the bounty for bringing in a Ji-won, Han-kyu offers him a partnership to keep him close. Ji-won assumes that Han-kyu is still the agent and agrees to get rid of his false accusation of a traitor. As they work and live under one roof, they maintain a tight-rope tension but an unusual friendship.
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