MTL - Go Crazy! Are You Really a Beastmaster? - Chapter 4 title page of destiny

The world of Nyil, with its monsters, its knights and its mildly sociopathic gods. Come and see! A soul flees and a soul arrives, blessed by luck. Will she survive? Will she thrive? Will she become a calamity? After all, luck is such a fickle thing. ‍

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

An Imperial Scholar by day. An assassin by night.The World of Cultivation has changed.Elemental Mancers. Flux Mancers. Spirit Mancers. Soul Mancers.Raining down fire and splitting oceans. Destroying mountains with a single stomp and calming skies with a glance. Controlling the tides of Karma, while wielding the souls of others like a puppeteer tugging on the Lines of Fate.The most mysterious of them all were Spirit Mancers, a truth that Theron was more than intimately familiar with. Due to one's Tribulation, his life was turned upside down. His family, his rage, his somber sadness becoming nothing more than Bad Karma's fuel for a madman.He was once a gentle young man, a non-combative Water Mancer who wanted nothing more than to read his novels to the sound of the rain and one day become an Imperial Scholar.But now...Everything had changed.He donned a cloak in the silent night as the clouds above gathered. Pulling its hood over his chilling blue eyes, he stalked off into the darkness.The first droplets fell.He would become the nightmare of his enemies, the blade hidden in the shadows of Heaven's tears.The River of the Night.

With the Goddess’ blessing, he became a 『Divine Knight』 and founded an Empire.
As time passed, he grows older, and by the time the heavens called for him to come, the Goddess showed before him, asking for his last wish.

He wished to be reincarnated in the future.
He dedicated all his life for his people, he had no time to master his own arts.
This time, he wishes to live for himself, forging his body to the utmost limit.

The Goddess complied with his wish.
In the far future, the King shall reincarnate as the 『daughter』 of a renowned Knight family.
And, under some circumstances, she is labeled as a failure of a Knight, however——

「How convenient. I can stand on the foremost line without needing any rank. No better training than actual combat!」

Thus, the legend of the world’s strongest, most beautiful Knight Disciple (♀) has begun—