Every three months, a Chinese single mother, Xue takes a 10-hour-journey from Hong Kong to her hometown in Fujian, China with one hand dragging her heavy luggage and another hand holding her child. She has to extend her visiting visa there to continue her stay in Hong Kong with her family, which migrated to Hong Kong and left her behind when she was 8. It is in fact an unspoken policy during 1980s in China that the local government would let the whole family move to Hong Kong except one child, so that they would send money and other materials back. Therefore, Xue received the best clothes from parents, but the price was that she could only meet them during holidays. Since then, applying the right of abode in Hong Kong for family reunion has become her main goal. Her twisted and unstable life leads her marriage to a failure. Drinking red wine with her rich Fujian friends in a penthouse, she finds that her broken family is not the only one. When Chinese migrates to other cities, have we tried to understand the story behind them? One Nation, Two Cities, a poetic and emotional engaging film from, tells us how the Chinese migrants sacrifice the traditional family value as the country hurtles towards modernity and economic boom.