Zuo Yingjie, a decorated sniper, is put in prison by a false accusation, where he receives a top-secret mission from a female agent Shen Xue of assassinating a Japanese bacteriologist Kitano Seichyo. But a traitor sells him out, leaving him in grave danger against his mortal enemy Shitagawa Kunimasa, an ace marksman of the Japanese. Some conspiracies are found. The revenge for the country and nation begins…