The Heroine is My Stepsister, and I'm her Final Boss - Chapter 55: The Reckoning Awakens

It is the year 2050, One of the world’s greatest assassins had fallen. Will his successor continue his legacy?

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

#1 In a small town, young Daisy endures a life of suffering under the tyranny of her stepfamily and the neglect of her father. Her once loving home now a prison, she and her mother are forced to serve her father's new wife and daughters. When a proposal arrives from a wealthy but disfigured nobleman, her father, eager to protect his other daughters, condemns Daisy to a seemingly bleak fate.

“Everyone deserves a happy ending, don’t they?”…In the brutal fantasy RPG Fall of Ares, saving the world came at a cruel price — the deaths of every heroine the player had grown to love. No matter how skilled you were, their sacrifices were inevitable. The game warned you not to get attached.But one young man did.After beating the game and lamenting their tragic fates, he wakes up in its world — reborn as an extra, armed with one mission from a mysterious system:[Change their endings. Let them live.]Now enrolled at Mysteria Academy alongside the heroines doomed to die, he must rewrite fate itself. For every girl he saves, he’s rewarded. But the world resists change. Calamities draw closer. The true enemy — the Children of the Sky — are watching.And one of the heroines… remembers it all.