中年人老赵（马书良 饰）和老罗（黄渤 饰）曾是一起当过兵的老战友，老赵投资房地产，向老罗及其亲戚、邻居举债，结果房子成了烂尾楼，前期投入打了水漂，作为保证人的老罗承受来自亲友的巨大压力，他和老赵的关系则变得分外紧张。由于老赵的抵赖，老罗被迫和妻子离婚，连儿子罗毅（杜海涛 饰）也对自己颇有微词。为了追回属于自己的四十万，老罗离群索居，准备采取高科技手段入侵老赵的公司，盗取现金。十五月圆之夜，他假意约出老赵叙旧，实则计划迷晕对方后外出行窃，制造不在场证明。只是天算不如人算，几起突发事件破坏了他的周密计划……
Old Luo, a non-governmental scientist, has devoted himself for many years to studying a variety of strange inventions and creations, and has built his own underground city and laboratory in the factory compound. Unexpectedly, Old Luo's wife and son, and turned against his old friend Boss Zhao. In order to regain his dignity, Old Luo decided to use extreme means - dig a tunnel to sneak into the Zhao family and steal back 400000 CNY belonging to his neighbors At the same time, when he was studying in Beijing, Luo's son, Young Luo, had a crush on Yue Zhao the daughter of Boss Zhao, who was always lovelorn. He began a "revenge plan" that coincided with his father. He wanted to "cheat money and sex.".
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