On a particular rainy day, Luhan forgets his umbrella when he decides to leave Beijing for Shanghai from constant torment of dissatisfaction. Fortunately, he spots a young woman who can help him get to the train station.

For the newly minted prosecutor, Yi Fan, it's all about formality, perfection, and the law. On the other hand, Mei An, the unmotivated high school girl, is sloppy, lazy, and average. When Yi Fan is stationed to Beijing, he moves in with a family friend who happens to be Mei An's.