Great Tang: The Strongest Imperial Grandson

The fourth year of the Zhenguan era. Li Er travels the realm. While passing along a river, he spots a baby floating downstream! Desperate to survive, Li Qiu gives Li Er the first smile of his life! Many years later. Li Er, with a youthful face and white hair, sits at ease in court as an imperial edict is written on bright yellow silk. “Dear grandson, if you don't conquer Byzantium soon, I'll have to bring you back to inherit the throne!” Ten thousand miles away, Li Qiu sits aboard an airship inspecting the enemy's position and gives a helpless smile as he reads the edict. Tell me, how did a foundling who once drifted along the Jing River end up as the Tang Empire's crown prince?