Seirei Tsukai no Blade Dance - Volume 15, Chapter 9 - Vorpal Sword

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
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Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

Qiao Shao, who worked hard to stay up all night and study, was first in class — if you count from the bottom.

“Yan,” the protagonist, was brainwashed by the emperor and lived as his puppet. After finding out he was being played by the emperor, he planned to seek revenge, but collapsed due to the emperor’s might. He thought he had died, but when he woke up, he realized he had regressed to the time when he was a recruit. Whether to seek revenge on the emperor or to find his family. The choice lay in his hands.

In the continent of Chang’an humans had lived as livestock and slaves to the Primordial Beasts. These beasts were ferocious, bloodthirsty and overwhelmingly powerful, but even so, the humans managed to prevail in the face of despair.