The story unfolds when a bomb that responds to sound is discovered in the city at the center of the city. This terror attack occurs following an incident that happened one year ago in a submarine, and important figures such as a submarine commander, reporter, and member of the Defense Security Support Command come together to try and stop the bomb.

Kang Do Young is a Navy submarine commander. He’s a key figure linked to the submarine incident that was the cause of the terror attack. Oh, Dae Oh is a passionate reporter. Cha Young Han is a member of the Defense Security Support Command.

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