Undercurrent: 1946 Shanghai

The story of the revolutionary Wang Long, who went by the alias Chen Zhiming and codenamed Earthworm, and sneaked into Shanghai to carry out covert work in the late Republic of China. He joined forces with many comrades to deal with the Kuomintang spy chiefs and their forces. They experienced many difficulties and dangers such as intercepting intelligence and sabotaging the "Scorched Earth Plan", and many of his comrades died. In the end, Shanghai was liberated. After Wang Long recovered from his injury, he took on new tasks and embarked on a new journey, continuing to fight for his faith.