The God of Sky & Earth - Chapter 1181:

Abandoned since childhood, the male protagonist lived a quiet, unremarkable life, until the day he awakened a strange and powerful ability: he could hear the inner voices of women.With this gift, he could understand their true thoughts, hidden desires, and deepest fears.Suddenly, everything changed. From a social outcast to an irresistible enigma, he began to navigate a world of secrets and seduction. His main goal? To earn the approval of the cold and powerful president’s. But along the way, hearts began to fall, first the alluring president, then the charming teacher’s aunt, followed by the seductive supervisor’s sister…With each connection, his influence grew. But with every new woman drawn to him, so too did the dangers of jealousy, secrets, and emotional entanglements.Who will be the next one? ...

Thousands of years ago, a small planet collided with Earth and destroyed the world. In five days, ninety percent of humans had been wiped out, leaving behind the last ten percent to earnestly struggle on death’s door.

Jinyu was one of those people who survived. Due to a special heredity trait, he could understand beast language. After the apocalyptic disasters, Jinyu had been living for a month with the few small beast brothers that he’d subdued. Previously, Jinyu had thought that he would live like that until he died. Yet, inexplicably, one day he opened his eyes to find that he was in a monstrous, lawless world that was full of vitality and life.

Jinyu’s transmigration into the future let him skip over almost one hundred thousand years. In the year 106825, beasts rule the galaxies and ‘pure’ humans are extinct. As the one and only ‘pure’ human left in the entire universe, Jinyu braves this new chaotic world to find a place for himself and thus begins to work at Beast Store number 138.

- Description from Novelupdates

This legend tells the tale of the protagonist, Kuroki summoned to protect the demon king from the hero.

Kuroki, unbeknownst to him, suddenly came to another world. He was summoned by the demon king, Modes. The territory which the demon king overrules was in the midst of being destroyed because of the hero. He had no choice but to bow before Kuroki.

“Please save us, Savior Dono!”

Kuroki nodded, deciding to save the demon king due to an unexpected turn of event.