The Grandmaster Strategist - Volume 6, Chapter 29: Wugou Glints Like Snow

Crossing to One Piece world, he became Roger’s younger brother.

When a cold and crafty girl travels into the body of a foolish, man-crazy, young female aristocrat, what will happen?

Then there’s James Bellini. His nickname? The Angel of Death.The man everyone fears. The man they all whisper about in dark corners. They say he’s merciless, that he has killed more people than anyone in the Circle. No one dares cross him. But there’s a secret, one that no one knows.James Bellini has never killed anyone. Not once.The rumors started because of a misunderstanding, a mistake so deep that even he couldn’t fix it. Now, the entire underworld fears him. Even the other bosses treat him like an equal, like he’s one of them. But the truth? The truth is something only God himself could untangle. And James? He’s just a man caught in the middle of it all.

As a walk-on, he had been the mistress of his sugar daddy for three year. However, they only had met each other for a few times.
As a boss, his sugar daddy had tons of lovers.
The walk-on: The cake shop is the only thing I love in this world. Lovers? Never want one.
The boss: No problem. Nobody wants that.
Then, they fell in love with each other…
Shameless playboy x heartless rogue
1v1, this is not a decent love novel.

- Description from Novelupdates