New Fantasy World: Galeia - Chapter 80

What happens when a scientist from a futuristic world reincarnates in a World of Magic and Knights? An awesome MC is what happens! A scientist’s goal is to explore the secrets of the universe, and this is exactly what Leylin sets out to do when he is reincarnated. Dark, cold and calculating, he makes use of all his resources as he sets off on his adventures to meet his goal. Face? Who needs that… Hmmm… that guy seems too powerful for me to take on now… I better keep a low profile for now. You want me to help you? Sure… but what benefit can I get out of it? Nothing? Bye. Hmmm… that guy looks like he might cause me problems in the future. Should I let him off for now and let him grow into someone that can threaten me….. Nahhh. *kill*-

Alternative: Leylin is transported from an advanced technological era into a medieval world— except there’s magic. Equipped with “only” his quick wits and an A.I. chip fused to his soul, he sets out to become the most powerful magus the world has ever known. In a land divided into the Light and Dark Magi, the weak can either be cattle or disposable slaves. Only the strong can determine their lives, and only they have the luxury for virtue. Yet strength is only a tool for Leylin, like any other. His goal, in the end, is his own.

Chu Huan was reborn in Xiangjiang, but encountered a bloody wealthy family vying for property. Let’s see how Chu Huan at this time stirs up the situation in Xiangjiang and becomes a generation of tycoons!

- Description from novelbuddy

Michael didn't want to die. He didn't deserve to die. After a lost battle with cancer that started only a year after he retired, he'd lived what many people would call a full life, but it wasn't enough. He wanted more time. Time with his wife. Time with his kids. Time with his grandkids. When he found himself drawn toward the light, he fought his way away from it. Unfortunately, that didn't take him back to the life he wanted to live. Reincarnated in another world, Michael is forced to be a Penitent, a soldier in the country he was reborn into in order to pay a debt to society he owes for taking the life of the child whose body he inhabits. It's not the life he wants, but it's the only one he has.An Isekai with light litrpg elementsMC will gain powers similar to those of a paladinBook 1 spends a lot of time in a military academy. MC does not stay a child for very long.Story will be a slower pace than my others.MC may not be to everyone's taste. He feels guilt for his actions that may seem unreasonable and is very human. He will grow, but it will take time.

A mysterious teenager who had lost his past, awakened in Tianlong Continent. Mistaken as the Ye family’s Son, he used this identity to observe this chaotic world and to search for his past self, but only to find an inevitable and terrible fate, therefore he indignantly laughed at his destiny, and revealed his prowess to rule the lands under the heavens.

Since then, the air and the clouds moved with his hands, and even thunderstorms were subject to his palms! He, as the fairytale’s main character, had shocked the people of Tianlong Continent with his legendary prowess and intelligence, but the extent of his powers were still unknown.

- Description from novelupdates