There Is No Sejong in My Joseon

I opened my eyes to find myself in Joseon, having become Grand Prince Yangnyeong, the eldest son of King Taejong. Destined to be a deposed Crown Prince, and the throne belonging to my younger brother, Chungnyeong, who would later become King Sejong. However, I am a reincarnated being. Using my knowledge of the future, I will build the Joseon that Sejong will create before he does! "I'm sorry, Chungnyeong. In my Joseon, Sejong is