The Most Powerful Young Emperor in the World

Reincarnated into the emperor's family, with power over the country to defend against foreign enemies. When a generation of young emperors rises, I will be the only one invincible in all the worlds! This emperor once had a harp named: Emperor Liu. There were nine swords in the harp that had never been born. I wonder if all the heavens and worlds can fight against them. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.