After the September 18th Incident, the mountains and rivers were shattered and the cultural heritage was endangered. Gu Yuqing, an assistant professor at Yenching University, gave up his writing and became a spy, using his expertise in history and geography as his edge, adhering to the belief of "keeping the land as well as the text"; Su Shuyuan, a famous actor in Kunqu Opera, was a secret actor who was soft on the outside and strong on the inside, becoming his most tacit comrade-in-arms; Mei Yicheng, the backbone of the military command, struggled with his position and finally went to the national calamity with sincerity. They traveled through the old capital of Peiping, Jinling Qinhuai, and the Hujiang Concession, and traveled through the Tongguan natural barrier, Yanmen Xiongguan, and the dangerous Shu road, and started a life-and-death contest with Yukihiko Watanabe, the leader of the Japanese special education course who was proficient in Sinology but was greedy and cruel. The undercurrent of espionage, the thrilling battle for cultural relics, the sacrifice of comrades, and the undying faith. After ten years of drinking ice, it is difficult to cool down the hot blood. Watching three patriots use spies as swords to protect the mountains and rivers, and continue the Chinese cultural heritage.
