The Great Mage Returns After 4000 Years (Web Novel KR) - Vol 2 Chapter 422

On the will left behind by the 14 year old suicide victim K:

“Taku Sugawara is the devil. Nobody should believe his words.”

"Your granddaughter claims she likes girls while my grandson is rumoured to be bent so… don't you think they are a good match for each other?"

Content Warning: R-18, Smut, Cruel MC[Ding! You've acquired the Heroine Stealing System!][Your first task is to steal the daughter of the Eastern Kingdom's king!][Your Fate Value has increased by 10!][You've slept with the hero's mother, your Fate Value has increased by 15!][The hero has developed animosity towards you. Current Hatred Level: 5 stars][The king's wife is charmed by your looks.]After being transported from his own world, the protagonist wakes up as Vritra, the son of Demon King Rohan from the Hell Continent.Since he's from another world, he doesn't have any Fate Value in this new world of swords and magic.To survive, he has to act like a villain, stealing the affection of every hero's heroine and sleeping with them.This will boost his Fate Value and help him stay alive in a world filled with wars and political conflicts!

This novel is also known as Master Fu's Mysterious Darling Wife

She is the The Young Miss of Military family Shen, her face is peerless, her temperament is cold, and she is her family’s treasure, but isn’t accepted as one’s child by her mother;

He is The Sole Heir to the top giant Fu Family, his power is unparalleled, indifferent high-born, the captain of the mysterious military force, and the youngest commander-in-chief.

Because of her grandmother’s wishes, she married him at lightning speed. She thought that it was a marriage that she needed, but she didn’t expect to be greeted with his extreme pampering.

- Description from Novelupdates