Rebirth of the Strongest Dungeon Master - Chapter 4 Seed Of Mind

“Xavier Lancaster, the richest and most influential man on Earth, lives by one simple motto: 'Money First'. A brilliant strategist, ruthless businessman, and master negotiator, he built an unshakable financial empire. But when a mysterious incident transports him to a medieval world on the brink of collapse, he finds himself… the ruler of a weak and crumbling kingdom.Faced with corrupt nobles, hostile neighbors, and a shattered economy, Xavier decides to use the one thing he knows best: the law of the market. Armed with his cunning, modern strategies, and cutthroat business sense, he turns every problem into an opportunity and every enemy into an investment.His goal? To become the richest and most powerful emperor this world has ever seen. But in a land where strength rules and magic exists, will money really be enough to buy everything?Get ready to witness the rise of a man who’s ready to put a price on the throne itself.”

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

Qin Shiwu grew up listening to his parents’ love stories from an early age.

He learned that his mother was known as a beautiful, gentle and virtuous Omega at school.

He learned that his father was known as a talented and courteous scholar Alpha.

Rumor has it that when they were in high school, they fell in love at first sight, became a harmonious couple and never had a single quarrel.

Once he transmigrated, he went sixteen years back to the time when his parents were still in high school and became a little fool who was bullied by everyone.

Who will tell him——

This person who grabbed him by the neck and shoved him to the ground! The super as*hole school bully who can’t get 100 points in all nine subjects is his father?!

That cold, unfeeling, kaolin flower, iceberg person, the most alpha Alpha in the whole school whom no one dares approach within a 500-mile radius is his mother???

Wait, mom! Were you so wild when you were young? You’re pretending to be an alpha!

Wait, Dad!! That’s your wife!! Is it really okay for you to fight with him now!!

- Description from Novelupdates

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy