During the Southern and Northern Dynasties, the "Mulan Ci" came out, and the story of General Mulan joining the army in place of his father became a battlefield legend and became a household name. However, for those who don't know, the true meaning of Mulan Ci is a wonderful article that combines astronomy, geography, astrology, and military affairs, to convey General Mulan's thought of "only those who can fight and dare to fight can deter war and stop war."
Guiyantang, a mysterious intelligence organization with an exclusive bloodline and the ability to control star maps, inherited General Mulan's idea of deterring war and ending wars. Taking the great cause of the family and country as his own responsibility, he led the members of the organization through the Ming Dynasty General Qi's resistance to Japan, the defeat of the Beiyang Navy of the Qing Dynasty, the Revolution of 1911, the Anti-Japanese War, the breakup of the Kuomintang and the Communist Party and the outbreak of the civil war and other historical processes. After being destroyed and reorganized several times, the shadow of Guiyantang's intelligence has finally remained in the clouds of history.
After the founding of New China, Guiyan Hall was no longer mysterious, and the new generation of Guiyan Hall masters vowed to hand over Mulan Ci to the country. However, the international political situation was changing. Anti-China intelligence organizations learned that the ancient Mulan code was used for espionage transmission, and even emerging technological forces could not crack it. The leader of Guiyan Hall was assassinated, the Guiyan Hall headquarters base was destroyed, and top national intelligence agents intervened. A new era of spy war is taking place.