Time travel to Luo Cheng, an illegitimate son who was hunted down by his wife. He relied on "pretending to be a ghost" (a small chemical experiment) to save his life. He invented "Zhenguan Mahjong" which became popular in Chang'an. Cheng Yaojin was obsessed with losing his belt, mistakenly exposed a fraud case in the imperial examination, and was framed instead. He relied on "calculus" to commit suicide. Proving genius, he formed a "delinquent group" and used pigeons to deliver meals to decipher the secret messages of the Turks. The Turks went south, Xiao Shiqi presented "gunpowder fireworks" to defeat the enemy, he was granted the title of county magistrate, and he founded the "Datang Institute of Technology". The students included princesses who disguised themselves as men and used "statistics" It was exposed that Qi Wang, the fifth surname, monopolized the imperial examinations, but was assassinated by poisonous arrows. He faked his death and escaped to the Western Regions, transformed into a "Silk Road businessman" and established an intelligence network. At the Tubo marriage proposal banquet, Xiao Qi brought a hot air balloon to rob the bride, cried out in anger, and developed "Wooden Cow and Flowing Horse 2.0" To sweep across the desert. In the North, Cheng Yaojin was addicted to being a courier. He went on an expedition across the sea to the Japanese country, used "pepper bombs" to force the emperor to surrender, discovered the Australian continent, built the "Datang Nanyang Branch" and raised kangaroos as mounts, fought a naval battle with the Arabian Empire, and used "compass + fireworks" to pretend to be divine punishment.
