Cold-blooded Undercover Master - Chapter 13 Backing Up

She was originally the king of the dark mercenary world, killing, plundering, and looking down on the world; once reborn, she became a powerful family that shocked the continent, the “Ninth Young Master of Waste” of the Beiting family;

From then on, the elegance of the world, shake hands;

Belonging to ancient monsters, possessing a magical space, practicing heaven-defying skills, killing the sky, killing the gods, and doing whatever they want;

Cool and handsome, domineering and arrogant, leading the world to compete;

In this article, the male and female protagonists are double C, male strong + female strong, and the ending is one-on-one;

- Description from novelbuddy

After ten thousand years of cultivation, he could have achieved immortality. However, his lack of human experience led to his failure to attain immortality.Thus, he resolved to immerse himself in a century of human existence, seeking to enhance his journey toward immortality. What he didn’t anticipate, though, was that upon entering the human world, he would find himself cast as a son-in-law, facing disdain not only from his wife’s parents but also from his beautiful wife herself.Armed with a wealth of cultivation knowledge, how could he transform his drab human life?

【Simulation Victim List—Yamada Ryo, Takamatsu Tomori, Chihaya Anon, Gotoh Hitori, etc.—】Thanks for the invitation, ROB. I'm in Japan, currently simulating “J-Rocker girls.”Kazami Haru, who simply longed for a peaceful and beautiful life, somehow ended up with a romance simulator that had absolutely no reason to involve him.Chasing after the system rewards that promised a better life, Kazami Haru started the so-called “romance simulation” with a playful attitude.But a simulation is just a simulation, so why are all the targets suddenly grabbing knives and chasing after him for a real romance?!【MyGO!!!!! × Bocchi the Rock!】