Any noise and a bomb will explode! Former Lieutenant Commander Kang Do-Yeong is revered as a national hero for saving many of his men in a submarine accident. But he couldn’t save them all and is tormented by the incident. One day, he receives a cryptic phone call informing him that a sound sensitive bomb has been planted at a soccer stadium. When the crowd reaches a certain decibel, the bomb will automatically go off. In the nick of time, Do-Yeong saves innocent lives but the terrorist remains intent on inflicting further casualties, including Do-Yeong's wife, Sergeant Jang Yoo-Jeong and his daughter, Seol-Young. Now he must race against the clock to track down the terrorist and save his family. Amid this impossible task, dark secrets the Commander left buried in the sea resurfaces.