D.E.M.O.N.S: Getting Summoned Weekly isn't so Bad - Chapter 41: What you leave behind

Ukei Kaito fought a desperate struggle in order to fulfill his role as a summoned hero. He defeated the Demon Lord and saved the very world, only to meet an end filled but with betrayal. The companions that he’d trusted throughout his journey betrayed him and killed him by sticking a blade through his chest.

Fu Hongxue was a cripple, born with a lame leg and subject to epileptic seizures. He was also one of the most powerful, legendary figures of the martial arts world, with a dull black saber that was second to none. His fame made him a frequent target of challengers, but whenever his saber left its sheath, only corpses would remain in its wake. One day, however, Fu Hongxue rescued someone whom he should have killed…and in doing so, set of a chain of events and a conspiracy that would rock the world.

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

Lu Junxi reborn in a small fishing village in Japan in 1950 and obtained the “Fishery King” system, which can help him detect the location of fish, and every time he fishes, he returns with a full reward. Can help him build the most cattle fishery, aquaculture I am the most hanging!

At this time, the Japanese fishery and ocean fishing have not yet started, and the offshore aquaculture industry has not yet developed. Lu Junxi felt that he wanted to be the owner of the Hokkaido fishery!

“No, wait, there are only five men left in the whole fishing village, who will go fishing with me?” Lu Junxi was dumbfounded.

- Description from novelbuddy