In the last years of Kangxi, the northwest territory was empty and dangerous. Zhou Yanqing, a prodigy in the calculation of Qintian Supervisor, was ordered to go deep into the Altai Mountains. Traveling thousands of miles, the survey map is just a representation, and I have an insight into the reality of the ambitions of Junggar and Rakshasa. Deserts, snowy mountains, treacherous shadows, swords and bows, murderous intent at every step. Using the slide rule as his blade and the stars as his map, he measured the mountains and rivers in the farthest mists of the empire, as well as the boundaries between his loyal soul and his country.