神祕北韓間諜誌源,潛入南韓進行暗殺任務,南韓特務漢奎負責逮捕他卻不幸失敗遭到開除,而誌源也遭誣陷被組織放逐。六年後,自行開設偵探社的漢奎竟又巧遇誌源。這對死敵在朝夕相處下,各自對彼此的動機心存懷疑,微妙的友情又在矛盾中增長,身處難以逃離的對立環境,他們最終必須面對宿命的決戰嗎?
Lee Han-kyu: Family is only family if they're together, don't you agree?... Lee Han-kyu: Hey, Ki-joon, try calling me big brother. Song Ji-won: No way. Why would I call you that? Lee Han-kyu: Come on, man. I like you. Song Ji-won: No. Lee Han-kyu: Geez, you're rude. Fine, I don't want to hear it either.
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