一夜讲述的是一个关于选择的故事，那个夜晚，瘾君子高安在上海某地铁站偶遇了一个女孩，短短的几个小时的相处却决定了两个人未来的命运，那个夜晚的选择改变高安以及女孩的下半生。当然，不同的选择所带来的将是截然不同的结果。

One Night is a story about choice. At that night, Gao An, a drug addict, met a girl at a subway station in Shanghai. Few hours of company decided the fates of these two people. The choice at that night changed the rest of their lives. Of course, different choices would lead to different results.