One Piece: From the Rocks Era to King of the World - Chapter 27 - One Month’s Progress

He is the heir of Di Hao Group; decisive, cold-blooded yet dotes on his wife a little too much.

A mysterious and strange world, a human civilization lacking power, and a horrible and turbulent world of human life, Luo Kai survived humblely as a prisoner. Pain and suffering honed his will. War and killing promoted his growth. He suddenly looked back. Is already one of the most powerful beings in this world.

- Description from novelbuddy

«Until death do us part.»That was our vow.And she kept it... by driving her sword through my chest.I was a hero. A symbol. The one chosen by the gods to free humanity.I fought for her. For us.But in the end, it wasn’t the demons who killed me.It was the woman I loved.Helena betrayed me.I fell with my heart shattered and my blood burning between my fingers.But death wasn’t the end.I woke up in another body, in another world...No, not exactly.I woke up inside the very story she wrote.And now, I am Daven von Riesenhart:the bastard son of a marquess, a noble outcast with a name no one respects, and a life I never asked for.I no longer believe in ideals, in gods, or in happy endings.I won’t fight for others.I won’t die for anyone.This time, I’ll live only for myself.And if surviving means deceiving, betraying, or destroying...so be it.Even if it makes me the villain of this story.

I thought I would live a better life in my second lifetime. Unbelievably, I’ve reincarnated into a slime that rolls around on the ground. Anyway, this is my precious new life, so I must work hard.