The return of "Big River" carries not only memories, but also the depth of the years and the truth of life. In this drama, Song Yunhui's image is still distinct, from the young man feeding pigs in the mountains to the director of the Donghai Chemical Plant, and then to the challenge of the Pengyang Pesticide Factory, his life has experienced huge twists and turns. 
Particularly fascinating is Song Yunhui's new chapter at the Pengyang Pesticide Factory, this time facing not only product quality issues, but also complex interpersonal and ethical dilemmas. At the Pengyang Pesticide Factory, he encountered new challenges, including the removal of many new colleagues, and in the face of serious quality problems in the pesticide factory's production, Song Yunhui's leadership and moral judgment were once again tested. 
The plot is full of suspenseful elements, and Song Yunhui discovers that two young technicians have changed the formula without authorization, trying to destroy the evidence. This discovery fleshed out Song Yunhui's role as he had to deal with production issues while facing the twin tests of morality and law. 
And Lei Dongbao's storyline is equally exciting. His decisions and actions demonstrate his wisdom and courage as an entrepreneur. In the face of various difficulties and challenges, Lei Dongbao has always responded quickly, demonstrating his entrepreneurial spirit and leadership. 
In the Big River series, the growth and change of the characters is an important theme. From the first part to the third part, we have witnessed the growth of characters such as Song Yunhui, Lei Dongbao, and Yang Xun. Every decision and action they make is imbued with the complexity of human nature and the reality of society. Their stories are not just individual struggles, but a microcosm of an entire era. 
Through delicate character depictions and compact plots, the whole series shows the audience the great changes in Chinese society since the reform and opening up. Every turning point in the story and the growth of every character are thought-provoking, allowing the audience to feel the challenges and opportunities of that era. 
In general, "The Years of the Great River" is not only a TV series, it is also a vivid social epic, recording the changes of an era and the struggle of a nation. **This drama is like traveling through time and space and experiencing that magnificent era firsthand.