Datang: I Am Four Years Old and I Am Invincible by Licking My Bag

Li Yi, a young man in the 21st century, traveled through the Tang Dynasty and became Li Shimin's eldest son. He was gifted with a licking system. At the beginning, he used his historical knowledge and modern views to shock Li Shimin and a group of famous ministers and generals. Through the licking system, he became the only prodigal son in the world. A bottle of insecticide solved the locusts that plagued the Tang Dynasty. A bag of hybrid rice seeds provided for the people's food and clothing. An invincible martial arts conquered the grassland Turks. But all of this starts with a four-year-old naughty child...