In 1939, the city of Peiping was under the iron heel of the Japanese army, and undercurrents surged in the seemingly peaceful streets. The CCP agent Lin Mo used the pseudonym "Qingshui Ming" and lurked in the staff headquarters of the Japanese North China Front Army, serving as a translator. He had a secret mission and relied on his special ability of "lip reading" to steal core intelligence in high-level meetings of the Japanese army and became a sharp blade in the enemy's heart. At the same time, Su Man, the ace agent of the military reunification, was lurking as a clerk of the puppet government. She had a fiery personality and extraordinary skills, but she crossed paths with Lin Mo by an accident. The two belonged to different camps and were wary of each other but were forced to join forces because of the common anti-Japanese goal. Zhao Jingyao, the police chief of the puppet regime, seemed to be following the trend, but in fact he had already seen the true face of the Japanese army and secretly provided support to the two men. The three formed a temporary secret line, and under the close supervision of Yuichi Tanaka, the head of the Japanese military's special high school course, they were walking on the edge of life and death. From interpreting confidential meetings to sabotaging germ warfare plans, from eliminating moles to dismantling traitor networks, they fought against the invaders' conspiracy with their flesh and blood, and wrote the spy legend in desperate situations. When faith and emotion are intertwined, when personal safety conflicts with national justice, can they stick to their original aspirations in the darkness and wait until dawn?
