The Blade Of God - Chapter 18: I Can See Through You (Slash II)

Aric Valerian, the fourth prince of the Valerian Empire, bears many titles: The Forgotten Prince, The Whore’s Child, The King’s Bastard—names that have been spoken more than his own. Born with a crippling illness and devoid of mana or ki, Aric was a disgrace, scorned by his family and the court. But when the gods cured him and gifted him the strength to fight, Aric dared to hope. He sought glory in battle, only to be betrayed by his brother and sent to die in a hopeless war. In his final moments, as death closed in, a mysterious text appeared before him… [Would you like to change your fate?] After being given another chance, Aric embarks on a ruthless journey to claim absolute sovereignty. [Ki Circulation Mastered: Strength +10] [System Upgrade: Advanced tactical planning unlocked] [Hidden Fortress Established: Stronghold security +15%] The forgotten prince claws his way through the treacherous landscape of imperial politics, he is forced to make impossible choices, each decision pushing him further down a path soaked in blood. He learns that true power demands sacrifice, and the price of vengeance may be his soul.

Michael was suddenly reborn into a another world by a God because of an accidental death. To make up for this fact, the God gave him another life in a fantasy world of swords, magic, and monsters.Unfortunately, it turned out that the world he was reborn into was still stuck in the medieval times. It didn't have electricity, it didn't have proper plumbing, and it didn't have any technology that he was so used to back in his old world.But thanks to the God's blessing and an AI assistant called ChatJK1, he was given the power to MAKE his life comfortable. Slowly, Michael transforms this new world into a place even better than his previous one by taking ideas from the modern world and putting it in this world, with the added bonus of magic.

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

…but it seems pretty doable.