A Dragon Idol's Reincarnation Tale - Chapter 16: Peace… for Information Session Number Two.

Qin Fen had once been abandoned and broken until, one day, he picked up a liquid metal ball that turned his life upside down.
This is the interplanetary era where Classical and Modern Wushu are competing. Classical Wushu enables followers to grow as powerful as dragons and elephants, whereas Modern Wushu enables followers to freeze monsters or even extinguish erupting volcanoes.
Qin Fen steps onto the stage of both Classical and Modern Wushu while belonging to neither. With the exquisite combination of both Classical Wushu and modern technology, he will pave a way to become a legend.
He is one of a kind, a favored son of heaven.

Reborn in a parallel world, he became a rookie fishing channel host.On the first day of fishing, he caught a corpse, unexpectedly solving a major case.On the second day, he caught a broken radio, miraculously receiving a broadcast from the future.On the third day, he caught a book of intrinsic skills, casually practicing it and becoming a supreme master.On the fourth day, he caught a string of ancient coins, uncovering a thousand-year-old sunken ship.......On the nth day, he caught a nuclear submarine.Fang Hao was baffled.Why couldn't he catch a fish but instead caught all sorts of strange things???The online audience was also stunned. When would he actually catch a real fish?

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

- 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.