Systemless Villain - Chapter 24: Martial Medallion

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

Rowen transmigrates into the world of One Piece, gaining the Strongest Trait System—capable of plundering the Traits of others!Spotting the golden—shimmering Trait on Koby, Rowen scoffs—You think a clown like you deserves this? Gimme that!From then on—Rowen plunders even more powerful Traits.Marine Headquarters: “He is a monster who devours and takes everything—the most dangerous ability user in history!Engaging him is forbidden without explicit authorization from the highest levels of the World Government!The World's Most Dangerous Man! 'Sky Sovereign' Rowen!DEAD OR ALIVE! Bounty: 3,988,900,000 Beri!”

Though it may be a dream weathered, crumpled, fading,I held on without surrender.Through each repeated day, running toward tomorrow’s light,I became a knight, resolute and bright.

He is high above, the mysterious and terrible King of the Wild. With one glance, he can see people’s romances. He hates women to the extreme, but at his first glance of her, he dotes on her and spoils her.
She is a humble transmigrator, a miracle doctor who doesn’t care for the many handsome men around her. She only wants to become strong, to be worthy of that god-like man. But when she’s finally sure of her feelings, she finds out she’s already been married for years…
……
When wronged：
She uses strength to hit the big handsome iceberg-like man in front of her eyes. “People say that I’m not good enough for you, but it is you who is an old cow eating tender grass!”
A man seizes the main point and laughs like an evildoer. “This husband has to eat the grass to confirm if it is tender or not!” He puts out the red candle……
……
The world says：
The barbarian king has no heart and has no passion.
A pregnant woman very miserably thinks,” If he has no passion, then who is responsible for this big belly?”

- Description from Novelupdates