1920年代的大上海，诡谲多变，列强划界，日本虎视眈眈。雷惊涛和柳光夫分执商界和银行界牛耳，为各自利益激烈争夺。柳莫原、黎介扬和江至豪是失散多年的结拜兄弟，他们虽各为其主，却有着共同理想——希望有一个和平、幸福的未来。上一辈的争夺冲不垮兄弟间的情谊，他们合纵连横，开始了一次又一次惊心动魄的行动，而女警员宋晓荷、雷惊涛之女雷茵茵的出现，为残酷的斗争增添了几抹亮色。日本间谍段霓裳潜伏在三兄弟身边，屡屡破坏他们的计划。日军大举进犯上海，三兄弟组织义勇队，配合十九路军开始了激烈的阻击战。在日寇威胁下，莫原、介扬为减少生灵涂炭，甘当人质；至豪也在深爱的段霓裳和民族大义间，作出痛苦的抉择。乱世下的三兄弟，为了理想同甘共苦，开始了新的奋斗。It is year 20 of the 20th century in Shanghai, a time of chaos and turmoil as a power struggle ensues between two powerful warlords. After a series of events, Liu Moyuan (Nicky Wu), Jieyang (Li Wei), and Zhihao make an unexpected discovery together. Years ago, during the chaotic battles of the warlords, the three men met and became close; under the extreme circumstances, they sore eternal brotherhood through thick and thin, promising to continue the struggle for a peaceful future. Losing contact after the war, they are finally reunited now in the discovery that each is the long-lost god brother of the past. Overcome with grief and joy, the three swear once more to carry out the promises they made in the past. The three brothers began a joint investigation to uncover the secrets behind the Shangxin Primary School, just as the final battle of the Sino-Japanese war is about to start. With much perils awaiting them and death hanging in the air, the three brothers vow to defend China if it costs them their blood and souls.

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