Su Ninghua, a graduate student in the Department of History, traveled through life as a destitute concubine in a cold palace, only to find that the harem was full of time-travelers - the queen was making gunpowder, the noble concubine was growing hybrid rice, the concubine De was performing surgeries in the middle of the night, the concubine Xian was writing formulas on the wall, and even the maids were memorizing the periodic table of elements.
They competed for favor by acting during the day, and held academic seminars over the wall at night, turning the cold palace into the "Harem Academy of Sciences." Until the emperor showed his face: he came from an interstellar civilization and had been secretly observing them for twelve years.
When farming, industry and interstellar civilization meet in the deep palace, a group of foreigners use knowledge to rewrite their destiny. There is no female competition, only fighting side by side; not only palace fighting, but also civilized romance.
