It's a Showdown, My Grandfather Yang Guang, Father-In-Law Li Shimin

In Chang'an, my apparent identity was: a freeloader, an uneducated person, a good-for-nothing prince-in-law who was disliked by the princess. My secret identity is: the grandson of Emperor Sui Yang, Li Shimin's secret weapon, and the sole executor of the merger of the two empires. And my true identity is... A modern social beast who just wants to lie down! But my "system" disagrees! In order to earn some royalties, I printed a few novels using the [Papermaking Technique] I was awarded. Result: The powerful family fought hard to seize the paper agency rights. The world's literati said: "Young Master Yang has single-handedly ushered in a prosperous cultural era. He should be our teacher!" In order to get a new pot, I used the bonus [Steel Forging Technique] to smelt some iron. Result: The smelted Kobelco alarmed the Ministry of War, and he was directly named the Director of Ordnance Supervision. The military of the Tang Dynasty: "With the Prince Consort here, we can seal the wolf's title to Xu, just around the corner!" Yang Fan (with tears in his eyes): "No, I just want to improve my life. Why do you fast forward me to create a prosperous age?!" Li Er/Yang Guang (looking at each other in relief): "My son/grandson really did not disappoint us!"