1. Low cost of living: Compared with first-tier cities, second-and third-tier cities have lower cost of living, including house price, rent, transportation expenses and daily consumption. Young people can get a higher quality of life under less pressure, and it is easier to achieve economic independence and accumulate wealth.

2. Increased employment opportunities: the competition in first-tier cities is fierce and the job market is more severe. Second-and third-tier cities are developing rapidly, and there are relatively more employment opportunities, including entrepreneurial employment opportunities. When young people return to second-and third-tier cities, it may be easier for them to find jobs or develop their own careers.

3. Quality living environment: Second-and third-tier cities are relatively small, with more livable environments, better air quality, less traffic congestion and relatively low pollution. At the same time, these cities are also increasing investment in infrastructure construction and urban management, providing better public services, medical care and educational resources.

4. Development opportunities and social activities: In second-and third-tier cities, young people have more opportunities to participate in social activities, such as volunteer work, entrepreneurship and social activities. Cities with smaller social circles have closer interpersonal relationships and more social opportunities, which can promote exchanges and cooperation between them.

5. Go home or be closer to home: For some young people, going back to second-and third-tier cities means going home or being closer to home, and making contact with family and friends more convenient and frequent. This is an important factor for some young people who value family relations.

It should be noted that everyone's choice may have different reasons. Returning to second-and third-tier cities also has its own challenges and considerations, so individuals need to make the most appropriate decision according to their own situation, career development and life needs.