The story of Shen Yanqiu, a graduate student in the Department of Physics, travels back to the Dajing Dynasty. The Black Rock Tribe in the north is eyeing him, and the barbarians from the southeast island are constantly harassing him. The imperial court promulgates the "Proliferation Order" to force a marriage, and his fate is bound to Su Qingyuan, the daughter of a doctor.
In the face of hunger and war, Shen Yanqiu used his knowledge of mathematics, physics and chemistry to survive: he made rabbit traps to feed himself, modified a curved shaft plow to plow the fields, and made water and windmills for irrigation. When the Black Stone Tribe's fire engine broke through the Zhenlu Pass, he used trebuchets to break the formation, vinegar and water to put out the fire, and even drew a defense system diagram to protect the border town.
From the existential crisis in Luoyanbao to the life-and-death battle at Zhenlu Pass, this couple in troubled times used science and medical skills to fight against the barbarians, and their love gradually grew during the war. When the prairie cavalry and island barbarian warships attacked, they proved that studying things to gain knowledge not only helps one to live in peace, but also can stabilize the country.
