Breeding Dragons From Today - Chapter 557 - The Vast Underground City! The Ancient Underground Civilization!

In a world where power is hidden behind corporate empires and ancient martial legacies, John Lopez lives a double life. Known publicly as a carefree young man, he secretly bears the terrifying title of the King of Horizon, a supreme martial expert feared across the continent.When his beloved sister Queenie becomes the target of a brutal smear campaign threatening to destroy her company and reputation, John is forced to confront the shadows lurking in the high towers of business and politics. As conspiracies deepen and enemies rise—ranging from corrupt business moguls to deadly assassins—John’s wrath becomes unstoppable. But danger isn't only around him—it strikes home when his eldest sister, Alice, falls victim to a rare and deadly poison. With time running out, John must defy the odds, wield ancient techniques, and unleash the full fury of Horizon’s might to protect his family.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

I was a good looking prince when I was reborn, and because I could do indecent things as much as I like, I decided to make a harem while traveling with a beautiful female elf~