What is the content of the Korean drama tunnel plot?

The Korean drama " Tunnel " was a realistic TV series with tunnel construction as the background. It mainly told the story of a tunnel construction team composed of engineers, businessmen, politicians and other people with different backgrounds. In the process of overcoming various difficulties and challenges, they finally achieved the project goal and solved a series of political, social and economic problems. The play explored the political, economic, social, and cultural factors in the construction process, as well as the professional responsibility and sense of mission of engineers by showing the complexity of human nature and the hardships of engineering construction. At the climax of the plot, the difficulties and challenges faced by the construction team in order to rush the construction and ensure safety on the eve of the completion of the tunnel were revealed. At the same time, the deeper problems of power, interests, and human nature were also revealed.