In the late stages of the Songhu Battle in 1937, Nanjing was in danger. Chen Guzhou, a military reunification agent, was reputed as a "traitor" and infiltrated the "No. 76" Wang Puppet Secret Service headquarters as an economist studying in Japan. Under Li Moqun, his former mentor and now enemy chieftain, he walked on thin ice, dealing with various forces.
His code name is "Lighthouse", but he feels more like a "lone boat" drifting in the stormy waves. Every time information is delivered, it means the sacrifice of a comrade; every time danger is saved, the balance of trust and suspicion swings violently. When his fiancée, surgeon Su Mo, also came to Shanghai due to the war and became an "outsider" that he had to protect, Chen Guzhou's mission became more complicated and cruel.
This is a life-and-death game of finding glimmers of light in darkness and guarding hope in desperate situations. He must use his wisdom and faith to prove that even a single leaf in a boat can become a beacon that pierces the long night and leads the way to victory.