Tang Dynasty: a Ladle of Water Woke up Li Er and Shocked the Whole Dynasty

Li Chengqian woke up and found that he had become the newly born crown prince of the Tang Dynasty. Faced with the historical ending of rebellion and being abolished, he did not panic at all. At the beginning, he woke up Li Shimin with a boy's urine and activated the system. The prince of another family is still studying the Four Books and Five Classics in order to seize the heir, but he has already practiced the supreme immortal technique by hanging up the phone. The Turkic army came to the city, and he didn't even leave the East Palace. A flying sword directly cut off the enemy's royal flag. The family members wanted to use food to choke their necks, so he threw out the seeds of the Immortal Family and backhandedly tricked the family into bankruptcy. Until one day, Li Shimin fell into deep thought while watching his son flying around in the sky. Why did you lead my humble Tang Dynasty into an Immortal Martial Empire?