When car salesman Lee Jung-soo (Ha Jung-woo) finished work and rushed to his daughter's birthday party, he passed through the newly opened Hatu Tunnel. Suddenly, there was a tremor, which made him experience the most isolated and helpless 35 days in his life. At this moment, the only thing he could do was to call 119 for help. The news of the tunnel collapse attracted attention from all walks of life. In addition to the search and rescue team, it also attracted a large number of bloodthirsty media who rushed to the news, as well as officials who put on a show just to increase their political achievements. The search and rescue team leader Kim Dae-kyung (Oh Dal-su) not only had to develop a rescue plan, but also had to control the on-site reporters and report to the show officials. The bad weather made the rescue operation worse. After finally excavating and preparing to rescue the victims, they found that the tunnel was a shoddy project. A series of heavy blows made hopes disillusioned one by one. What's worse is that the leader of the rescue team died accidentally during the search and rescue operation, and the huge expenditure of the national treasury prompted a public opinion trial, forcing Lee Jung-soo's helpless wife Se-hyun (Bae Doona) to sign a consent form to give up rescue. It wasn't just the tunnel that collapsed that day, it also set off a modern social image scandal.