Kujibiki Tokushou: Musou Hāremu ken - Chapter 10

This story is about a rookie researcher, who was forcefully dragged away from his restful life, compelled into facing various killers and zombies, always having to risk his life at the brink of death, and finally becoming an advanced researcher that is acclaimed by all. And throughout his adventure, he met an alluring(?) killing machine, who he started to have fantasies on after they had an accidental kiss…

Xiao Yan: Did I fall for him? But he’s a man!

Maya: Who knows…. maybe it’s the other way round?

- Description from Novelupdates

He was once the most feared villain in the empire, a master of manipulation who wove chaos from the shadows. Ruthless, untouchable—until the day he was betrayed and executed by the very man he sought to control.But death is not the end.He awakens in the body of Lady Elara Valcrest, a fragile noble girl doomed to be a pawn in political games. Stripped of her former power, she is forced into an arranged marriage with none other than Cairon Everhart—the man who once killed her. He does not recognize her, but she knows him. And she will never forget.To survive, Elara must play a new game. One where deception is her only weapon, and trust is a dangerous illusion. She must outmaneuver her enemies, uncover the truth behind her execution, and reclaim the power she lost. But as she navigates the treacherous world of court intrigue, one question lingers—Was Cairon truly her greatest enemy? Or had she been blind to an even greater threat?Time is running out. The villain has been given one last chance. And this time, she refuses to lose.

Max Winchester suddenly found himself in the world he hated the most, Xiao Bai novels.Not only was he not the protagonist, but he became a villain, and the worst thing is, unlike other Villains, he was not transmigrated at the beginning of the novel but rather at the end point of his arc.His death was already decided; the Protagonist had already firmed his foothold in the city.The most important thing for the villain is their family already pretty much disowned him; the sisters who used to dote on him were ignoring him.His business was in a crisis as he was just days away from declaring bankruptcy as his capital chain was broken.He found himself standing in front of his childhood sweetheart, who came to him to break off their engagement.When he was in the desperate situation, the compulsory golden finger of every traveler popped in.[Ding! The Counter-Attack System is being bounded][Ding! Protagonist attack on host detected...Counter-Attack is being triggered....][Ding! Congratulations to the host for gaining {Absolute Dodge}...][Ding! The protagonist gaining strength is detected...Counter-Attack is being triggered....][Ding! Congratulations to the host for receiving the SS+ Calamity rank power base....][Ding! Protagonist attacking your company detected....Counter-attack is being triggered....][Ding! Congratulations to the host for receiving 1 Trillion UC market value company....Congratulations to the host that Protagonist's most loyal brother who helped him in attacking your company stepped on shit and died....][Ding! A protagonist's childhood sweetheart hatred towards you is detected...Counter-Attack is being triggered....][Ding! Congratulations to the host for receiving +100 (Only one) Favorability of Protagonists childhood sweetheart....][Ding! Protagonist trying to blackmail your sisters detected....Counter-Attack is being triggered....][Ding! Congratulations to the host for receiving +1000 (Not even death do us apart) favorability of his mother....Congratulations to the host for receiving {Harem protection halo}....Congratulations to the host that the Protagonist lost his PP right....Congratulations to the host for the Protagonist lost half of his mind....]And so he goes on his relaxing journey of the Counter-Attack.

An ordinary student, a wretched peeper, a cowardly teenager with a kind heart. In a terrorist attack, he inherited the knowledge of countless elites, embarked on a path of God Jagged Tu…

He is an artist!

He is a mathematician!

He is a psychology Doctor!

He is a master of fighting!

In fact, he is a man

Taken off raw site:

A wretched, dirty young man is working during the summer when he was caught up in a mysterious explosion. After that explosion, the young man is then left with the memories and knowledge of dozens of the world’s experts.

He has changed, his heart has become cold, iron-blooded. He became a killing machine, his mind turned mechanical, calculative. Everything goes according to his plans and calculations!

In this magical, slaughterous world, a door is opened for him…

- Description from Novelupdates