Darkness and light are inherently opposites. If the two intersect, it will bring endless darkness. The two separate countries will fight each other, which will bring painful costs to both sides and endless wars. Now, with the rapid development of science and technology, open wars are rare and have been replaced by more dirty and dark activities. Since then, many special organizations have been spawned. When a Korean American special forces leader faced a Chinese military colonel, a battle The war between darkness and light is about to break out. The two people, who are both the pride of heaven and unwilling to bow, are facing each other hard, fighting openly and secretly again and again, on the verge of life and death, between swords and shadows, being captured and tortured, making the two of them cherish each other and have mutual affection. But how should they choose between marriage, organization, family, and life and death?