The most important reason is that era. Xiangzi is in the lowest position in that society, and it is in a backward and poor society, especially farmers. The exploitation of farmers by poverty is very serious when they live. In any society, people like Xiangzi can't see any future and future. In fact, the initial understanding was also a dream and a purposeful struggle, but after his long-term efforts, he still did not change his current situation, which made him gradually lose confidence in life and began to become, um, depressed, so the last thing he expected was the tragic ending brought by this society.