Time and Space Sword Keeper

Qin Yang, a modern historian, touched the mysterious ancient sword in the Forbidden City and accidentally traveled to the "Dasheng Dynasty" in parallel time and space, and was rescued by the seventh princess Xiao Yue. This seemingly idle princess is actually secretly managing her power, trying to fight her way out of the whirlpool of the crown prince and the second prince's succession. Qin Yang relied on modern knowledge to help her solve the dilemma: using saltpeter to make ice to relieve the emperor's illness, using war bonds to solve the military salary crisis, and even discovered that the Zhenguo Divine Sword hidden the secret of traveling through time and space. When the seriously ill emperor secretly favors Xiao Yue's succession, the powerful minister Zhao Shichang colludes with enemy countries to launch a coup. The man behind the scenes is Yu Wenhong, a time traveler from three hundred years ago - he tries to use the royal blood and the divine sword to restart the time and space channel. Qin Yang led his army to attack the city and rescued the imprisoned Xiao Yue. He smashed the conspiracy amidst the changes in the world caused by the divine sword, but lost the chance to return to modern times forever. At the beginning of the new dynasty, Xiao Yue became Dasheng's first empress, and Qin Yang implemented reforms as the emperor's husband: the imperial examinations were added to the Gewu section, the army adopted new training, and water conservancy projects nourished thousands of hectares of fertile land. When envoys from enemy countries kneel down and beg to learn "new learning", and when ships sail to the west carrying compasses, this pair of partners who span time and space finally sow the fire of modern civilization in the land of the ancient dynasty.