After the fall of Shanghai in 1937, the underground party agent {Shen Yan}, codenamed "Mobi", lurked on the isolated island as a clerk of the Wang Puppet Secret Service. He secretly conveyed information about the Anti-Japanese War, incited patriots to rebel, fought against the Japanese puppets and the Japanese army's siege, and smashed many conspiracies to sabotage the Anti-Japanese War. In the thrilling secret battle, Shen Yan worked alone, guarding the underground transportation lines, using loyalty and wisdom to light up hope for the war of resistance in the darkness.
