Why do we live more lonely when the city is bigger? This may be the story of all of us. After leaving campus and stepping into the society, we gradually lost time and friends in the work and life of leaving early and returning late. The protagonist is an ordinary office worker, whose day-to-day work makes him have no time to care about the colorful city. Working overtime is longer and shorter, free life is shorter and shorter, and he is trapped in a prison called reality with numerous inner demands. Until one day, the protagonist's first encounter with a girl in the subway, like the sun after the rain, not only touched the protagonist's heart, but also ignited his yearning for free life.He resolutely left the company on a rainy night and devoted himself to love and free life.