Lin Chen, a history graduate student who has traveled through time as an adult, stepped into Shanghai, which fell in 1939, as Japanese Lieutenant Tatsu Sato. Under the guise of seven years of Japanese life, there is the ruthlessness of his boss Matsui, the danger of No. 76, And the tragic situation of people's livelihood under the bayonet on the streets. The pressure is like a dark cloud - he must not only hide from the scrutiny of the Japanese and puppets, but also find the party organization in the fog.
However, his father's hidden plot of military rule, the historical materials of the Anti-Japanese War in his mind, and the secret route passed down by his mother made him cling to confidence in the darkness: the soul under the military uniform was never here to "loyalty", but to use his identity as a blade to find a light for the anti-Japanese war in the heart of the enemy.
