Similarly, the story exchanges old protagonists for new as it transforms from a typical love story in which a man and a woman are arguing to a 15-year-old girl who is losing her sight, gradually building a sense of the impotence and distance that modern people stuck in some place (the subway) feel.
故事構想中的主角一再更換，從男女吵架的通俗愛情故事，轉到一個十五歲且逐漸失明的少女，營造出了現代人困在空間（地鐵）裡的無奈與疏離感。