Great Tang: How Did I Become the Crown Prince?

Li Dong's soul enters the body of an ordinary young man in the Great Tang during the Zhenguan era. Because of him, Li Shimin's sons become more capable. Li Chengqian grows more confident about securing his position as Crown Prince.

Li Tai, Li Ke, Li You, and the others are also full of confidence about winning the position. Each of them thinks the throne is theirs.

Then one day, Li Shimin suddenly issues a decree, announcing to the world that Li Dong is his true eldest legitimate son, and appointing him Crown Prince...

Li Dong immediately sits bolt upright in his reclining chair. “What the heck? How did I become Crown Prince?!”