During the troubled times of the Republic of China, the Japanese army was raging. Chen Yu, who was born into a poor family, met Shen Yi, a son of a wealthy family, in the military academy and joined the Kuomintang intelligence department together. While investigating Japanese spies, a traitor was discovered within the Kuomintang, and the two had differences due to their positions. After the test of life and death, under the influence of Lin Ya, an underground member of the Communist Party, they gradually leaned toward communism. They went through hardships and obstacles, exposed the truth, fought against the Japanese army, and finally joined the revolution and ushered in the dawn of victory.
