那抹微笑一直未改变

This name conveys a sense of constancy and warmth, suggesting that there is one particular smile (perhaps from a specific person or just an emotional expression in life) that has remained unchanged over time. It reflects the person's longing for this enduring symbol of innocence and purity. The user might feel that despite changes and hardships, there remains an element of joy and sincerity untouched by time. This implies a cherished memory or relationship.