Why did my second brother and second sister collapse?

The factory was paralyzed by bombing. In the second episode of the TV series My Second Brother and Second Sister-in-law, Da Zhuang was working in a factory, and his legs were paralyzed by the explosion in the factory because of machine failure. The spirit of self-improvement after paralysis made many viewers cry. My second brother and second sister-in-law are directed by Liu Jiacheng. It takes a tortuous and bizarre love story as the main line and tells the joys and sorrows of a family.