During the Anti-Japanese War, Mao Yuanzheng, a CCP agent, rescued the orphan Chang Ping'an, but he was killed by Cao Ruofei, a military agent. After the victory of the Anti-Japanese War, Chang Ping'an, who had married Wang Xiaoyu but was still bent on revenge, entered the Military Baoding Station and found that the person who killed Mao Yuanzheng, who was like a father to him, was Cao Ruofei, the husband of Fu Yun, whom he had secretly loved. In order to get revenge, Chang Ping'an followed Cao Ruofei day and night. At the same time, Fu Yun, who was ignorant of the world, was deceived by Cao Ruofei and told some of Chang Ping'an's experiences in the past. Although Chang Ping'an passed this difficult time, his crises kept coming one after another. In the end, Chang Ping'an, who had joined the Communist Party of China, was forced to expose his identity. He fought back to the water and publicly assassinated Cao Ruofei, but failed. Cao Ruofei formally arrested Chang Ping'an and took Wang Xiaoyu hostage to force him to confess his companions. At the identification site, Cao Ruofei was shot dead on the spot-all of this was actually Chang Ping'an's plan.