Guide on How to Fail at Online Dating - Chapter 95 - From "Just Be Happy”, back to the original period.

Pei Jin is a black bellied prince. To outsiders he is a kind gentleman and always calm.

To reward Meng Fan for his bravery before his heroic death, the cosmos rewarded him with a ‘system’, sending him back in time to three months ago, alive.

- Description from Novelupdates

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.

In the grand weekend year, demons cause chaos, and people cannot live peacefully.Han Zheng, carrying the game setting he designed [Taotie Furnace], travels to this world. By sacrificing to the furnace, one can break through martial arts techniques.From [White Ape Extended Arm Fist] to [Ape Demon Nine Transformations].From [Vajra Fist] to [Great Vajra Ming King Seal] and then to [Great Mighty Dragon Bodhisattva View].From [True Martial Refinement] to [True Martial Holy Body] and then to [True Martial Indestructible Body]There are no gods in the world, hence demons run rampant, and evil spirits are everywhere.As Han Zheng kills his way through the chaotic world of demons, looking back, he has become the only true god in this world!