The story is told between the past and the present, the "us" and the "them". The scenes in the past are presented in color while scenes in the present are in black and white. During the Chunyun period, two strangers, Lin Jianqing and Fang Xiaoxiao, meet on the train while traveling home. They become friends and find out that they are both living in Beijing, trying to find success. Jianqing wants to become a game-maker but has to deal with financial issues as well as lack of time. Xiaoxiao lives with her boyfriend in Beijing, but she leaves him due to an issue with his mother. Xiaoxiao then moves into Jianqing's tiny room in a complex. Two of them make money selling computer softwares and Japanese porns. In the present day, Jianqing coincidentally encounters Xiaoxiao during a Chunyun flight. They room together for the night due to a flight delay and reminisce about their relationship. The story then goes back to the past. During Chinese New Year, Jianqing and Xiaoxiao get drunk and have sex, thus beginning their relationship. At the onset, things were good as they both got new jobs. At the next New Years party, Jianqing spends a lot of money to impress his friends back home. Two of them return home during the Chunyun period, and spend time with Jianqing's father. Jianqing's father tells him that he doesn't need to act rich to his friends if he is not. One day, the manager evicts the couple from the complex. While at work, Jianqing picks a fight with a caller and gets beaten up. The couple begins to disconnect as Jianqing becomes increasingly angry and distant, picking fights with strangers and arguing with his father. Xiaoxiao breaks up with Jianqing while he was gaming. When Jianqing notices Xiaoxiao's absence, he runs out and finds her on a subway train. They stand in silence as the train departs. He becomes determined to work and finishes his game, which becomes a big hit and lands him a job. Xiaoxiao sees Jianqing on the news where he talks about the inspiration of the game's story and how it ties back to her.