When a society begins to decline, people often think that the first to bear the pressure are the lower classes, but the true initial fracture usually occurs in the middle class. Because the middle class relies on institutional stability, predictable rules, and upward mobility channels, they survive through education, professional skills, and the dividends of order. Once the rules fail and opportunities shrink, this group's support system quickly collapses: upward mobility is compressed, and their original positions are continuously encroached upon, making it difficult to stabilize upward or to sink rapidly. When the middle class begins to lose a sense of security and certainty on a large scale, the society’s buffering structures disappear, polarization intensifies, conflicts escalate, and overall stability is also shaken. Therefore, the collapse of the middle class is often not a superficial phenomenon but a dangerous signal that the deep structural balance of society is starting to falter.