Shen Xiuwen, a college student who had served two years of compulsory military service and had just set foot in the society for less than half a year, was unfortunately killed in a conflict with a Japanese boss. Nearly 80 years apart, Shen Xiuwen, who has two memories in one, came to Shanghai in the 1930s. Facing the impending January 28th Incident and the wolfish ambition of Japanese militarism to invade China, what should he do? At the same time, as he grew up under the red flag, how should Shen Xiuwen choose in the face of the life-and-death struggle between the Kuomintang and the Communist Party, the second cooperative anti-Japanese war, and the liberation war after the victory of the Anti-Japanese War?