Reopening Zhenguan

During the heyday of Zhenguan, Emperor Li Shimin of the Tang Dynasty was discussing political affairs with Wei Zheng, Fang Xuanling and other ministers in the Zichen Palace. A mysterious white light suddenly flashed, instantly pulling the group of emperors and ministers away from the bustling Chang'an City. When they opened their eyes again, the familiar sandalwood scent of the Dragon Chair disappeared and was replaced by a strange, empty room that exuded a musty smell. When they opened the window, they were horrified and speechless by the world in front of them - the same bustling market, the same Han Chinese faces, but everyone on the street had shaved their foreheads and dragged an ugly and weird braid! Where is this? Why do all the sons and daughters of my Han family shave their heads and wear clothes? The huge unsailed iron ship, the pungent smell, the thin braid swinging behind the head... Everything showed that they had arrived in a completely unfamiliar era. The emperor and famous ministers are trapped in the strange world of this braided dynasty. Faced with this shocking change of "the world is turning upside down", how should they deal with it, and how will they explore the truth behind it?