این سریال که اقتباسی‌ست از فیلمی به همین نام با بازی مارک والبرگ، داستان یک سرباز بازنشسته نیروی دریایی را روایت میکند که مجبور می شود برای جلوگیری از یک توطئه جهت قتل رئیس جمهور دوباره به صحنه‌ی نبرد بازگردد و از توانایی های خود استفاده کند...

When a secret police operation fails, sniper Lee Ho-yeung develops a personal grudge towards his co-worker Ko Chun-kin. Ho-yeung eventually decides to leave the police force and becomes the president of a firearms association, colluding with organized crime on the sky. Through abusing the trust of an unknowing detective and the trust of his girlfriend who still works with the police unit, Ho-yeung has secretly been working against Chun-kin, who has been kept in the dark the whole time. But when Chun-kin starts to suspect the clues within multiple murder cases, a tense standoff between the brothers unfolds.

Set in a different Tokyo on a different world than ours, the story follows Tokunana, a unit of assembled misfits in the Metropolitan Police Department. Tokunana battles against "Nine" — an organization commiting crimes in their zealous worship of the dragons that once roamed the world.