The story is based on a mysterious cavalry unit during the Sui and Tang dynasties - the Yanyun Eighteen Cavalry. They have been ordered by the imperial court to guard the border. They are well trained and skilled, which makes the enemy frightened. They can be called the strongest special forces in the era of Cold weapon! On a pursuit mission, the Eighteen Cavalry Serendipity that the weapon held by the foreign enemy was made by the unique technology of restoring earth and burning blade in the Sui Dynasty. The court has been infiltrated by traitors, and a large army of foreign vassals is under pressure. How will the eighteen cavalry, who have experienced countless battles, transmit this important information and protect the thousands of people behind them?

故事取材自隋唐時期一支神秘的驃騎部隊——燕雲十八騎。 他們奉朝廷之命守護邊關，訓練有素武藝高強，令敵人聞風喪膽，堪稱冷兵器時代最强的特種部隊！ 某次追擊任務途中，十八驃騎意外發現外藩敵人所持兵器，乃是隋朝獨有的覆土燒刃科技所打造。 朝廷已被奸人滲透，外藩大軍壓境，身經百戰的十八驃騎，將如何傳遞這份重要情報，守護身後萬千子民？