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Li Heng traveled through the second year of Zhenguan in the Tang Dynasty and was bound to the sign-in system. Facing the drought years of the Tang Dynasty, Li Heng's life was very smooth with the help of the system. Not long after Li Shimin ascended the throne, disasters struck the world one after another, until he mistakenly entered Li Heng's residence and was mistakenly identified by Li Heng as his father? "Son, some people say that the severe drought in the world is the fault of the emperor. What do you think?" "It's nonsense. It's just a natural disaster." "Then what do you think of the emperor killing his brother and forcing his father to abdicate?" "How can you watch this? Of course I watched it while lying in bed."

In the early Tang Dynasty, in the second year of Zhenguan, Li Sheng traveled through time and became a small eunuch during the Tang Dynasty. At this time, Li Shimin, Du Ruhui and others who were attacked by Turks unexpectedly came to the village. What surprised Li Shimin and others even more was that the things in this little eunuch's home were very unusual! "Li Sheng, what is a chemical reaction? What is an endothermic reaction?" Li Sheng: "I..."