该剧以20世纪20年代的“魔都”上海为背景，讲述了一个关于“选择”的故事。48集是TV版，56集是DVD版
洪三元（陈思诚饰）携母亲和好友齐林（袁弘饰）到上海投奔严华（富大龙饰），卷入两大公司权利斗争。严华此时是一名码头工人，他不畏强权被推举为工人领袖。洪三元则凭借机智多次在凶险的上海滩化险为夷。洪三元与忠义之士沈达义结金兰，与来上海报父仇的林依依（佟丽娅饰）在斗智斗勇中成为莫逆，女扮男装的林依依爱上洪三元。洪三元接近富家女于梦竹（郭采洁饰），于梦竹爱上洪三元。严华遇险，为共产党人李新力所救，加入共产党。林依依为报仇铤而走险，洪三元与其奔走天涯。林依依遇难，洪三元重回上海滩。在严华和李新力进步思想的感召下，洪三元放弃来之不易的“美好生活”，为护送李新力离开上海倾其所有甚至生命。洪三元逐渐懂得，共产党带领的这条道路，才是他所想追求的远大前程 。
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