Na Dow, a punk who grew up lying, stealing and fooling around, decides to straighten out and takes his first steady job as a courier. The job is simple: hail a cab at sunrise, deliver a package to a close friend of Na Dow’s boss, and return on the same cab by sunset. It turns out that he would be delivering heroin of top-notch quality.

Na Dow hesitantly gets on a shabby taxi driven by the carefree Old Xu, a Hong Kong native who came to Taiwan 25 years ago and somehow decided to stay. Na Dow's plan to reform himself and Old Xu’s wish for a peaceful life take a downturn when they become the target of a mob attack.