In 1937, Peiping fell. Chen Mo, a talented young linguist and lecturer at Yenching University, was developed into an intelligence officer by Fang Jue, a mentor who appeared to be serving the National Government but was actually a member of the underground party of the Communist Party of China because of his proficiency in Japanese and deep insights into Chinese society. In order to break into the Japanese secret service "Mei Agency", he must play the role of a "traitor" who is full of resentment against the National Government because his family was destroyed by the war and turns to Japan. With his extraordinary wisdom and proficiency in Japanese culture, he successfully gained the appreciation of Sasaki Akira, the head of the "Ume Agency" agency, and became his "China expert" consultant. However, his act of surrendering to the enemy also earned him the scorn of his closest relatives and the infamy of the entire society, including his most beloved girlfriend, progressive student Lin Huajun.
For eight years, Chen Mo (codenamed "Lighthouse") struggled between dual and even triple identities. The key intelligence he delivered turned the tide of the war time and again, saving countless lives and important strategic forces. However, he himself had to endure the confusion from his comrades, the temptation from the enemy, and the huge psychological torture of inevitably staining his hands with the blood of his compatriots. He is like a silent fire burning in the ashes, lighting up the dawn of victory in a self-destructive way.
