Fourth Prince's Debauchery - Chapter 24 The Butler, the Knight, and the White-Haired Girl

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.

She had a lifetime of fake virtue without receiving a virtuous ending. In the next lifetime, she controls fates with the flip of her hand. To the jerk who wasn’t faithful, she’ll draw a premature death talisman for him. For the poisonous step mother, she’ll send a death flower. For the step sister who is two faced, she’ll personally rip off that fake pretty face!

But when she personally offered up her body to her nemesis because of a child who she had no fate with, something unexpected happened. The night of the big wedding, the groom changed and a cold and luxurious man pushed her down. “You can marry whoever you like, but you can only give birth to my children!”

- Description from Novelupdates

After dying in the apocalypse, Su Jin was given a second chance as she was reborn into her former self just one month before the beginning of the end. Knowing that the world was about to fall apart, she started stockpiling everything she could. Her family started to think that she had gone crazy after her marriage and was ready to gang up to ruin the trashy husband. However, as the world suddenly changed around them, their air tickets and money were rendered useless and they now understood just how much foresight their beloved Su Jin had this whole time. As they continued to fight for survival, Su Jin’s husband scoured the city with several better-looking team members. One of them groaned while trudging ahead, This is the 212th time we’ve lost our way since the team leader began his search for his wife…

The first part is finished, and the second part is starting. Two worlds of immortals and demons, and the boundless universe. This decides the tone of the second part!