The Cuckmaker's System: Netori fromm the First Day - Chapter 11: The Ambush

Master said, the woman I held in my hands, I must protect for the rest of my life.

“She betrayed me. Lied to me. Left me for a richer man...I gave her everything—my time, my love, my dreams. And in return? She walked away like I was nothing.”Chen Yu thought he had it all figured out—a simple life, love, and a future with the girl of his dreams. But when Li Yuxin, one of the most popular girls in the university, chooses wealth over love and leaves him for the arrogant Young Master Kang, Chen Yu's world crumbles.But fate has other plans.Just as he's drowning in heartbreak, a mysterious voice echoes in his mind:“System has found the perfect host. Binding initiated.”Now, with a powerful system in his hands—one that grants him experience in any skill he desires—Chen Yu embarks on a journey of transformation.He doesn’t want revenge.He wants greatness.From rock bottom to the very top, Chen Yu will rise.And those who once looked down on him?They’ll wish they never did.He will have to rise to the top of the world before the EVENT comes.

The journey to the martial peak is a lonely, solitary and long one. In the face of adversity, you must survive and remain unyielding. Only then can you break through and continue on your journey to become the strongest. High Heaven Pavilion tests its disciples in the harshest ways to prepare them for this journey. One day the lowly sweeper Kai Yang managed to obtain a black book, setting him on the road to the peak of the martials world.

- Description from novelupdates

I was reborn as the villainous daughter, Yumiela Dolknes, in the world of an otome RPG game. Yumiela only had a small role in the original story, but after defeating the Demon King, she will appear as the Hidden Boss with a bonus specs to solo fight the Hero party.

Having a gamer-spirit, I’ve been raising my level since I was a child. By the time I enter the academy where the game stage is, I was level 99.

I wanted the heroine and the capture targets to defeat the Demon King, but they just flirted around and didn’t raise their level. Moreover, they treat me as if I’m the Demon King just because I have dark hair and use dark magic.

It’s a story where I aim for peaceful days.