When he woke up, the doctor of materials science transformed into Fang Jun, the second son of Fang Xuanling, the prime minister of the Tang Dynasty. Faced with the diagnosis of "Leaving Soul Syndrome", the dietary therapy of ginseng chicken soup, and the maids in the room who exclaimed "The young master is hysterical again", he rubbed his forehead - in the prosperous era of Zhenguan, all nations came to court, but there was not even a screw. When news of the victory of the famous general Li Jing spread throughout Chang'an, Fang Jun looked at the teacup in his hand and silently calculated the melting point of the fired glass. While others were fighting for his father, he decided to use chemical reactions to add some different "hard technology" to this prosperous Tang Dynasty.