MTL - A Smile from the Villain - ~ 15 selected

It was only after Su Yayan's death that she realized that she was a malicious cannon fodder female character who became a scapegoat in a Mary Sue story.

Protagonist travels between different anime worlds to right wrongs and uncover his reason for being along the way.

He went from an ordinary student to a god-level master in manufacturing.
Continuously progressing, processing range from hundreds of meters to tens of atoms, processing precision from microns to nanometers to atoms and molecules, everything was possible.
Wassenaar Accord? The embargo against China? What we have banned are technologies that China doesn’t care much about. Most of the member states have to import technology from China, shouldn’t the member states have a meeting to discuss and bring in China as well?
Forbidden chip sales? Is there a mistake? We barely managed to maintain our low-end market with a large amount of subsidies, it’s already good enough that China didn’t initiate an anti-dumping investigation. President, are you sick?
Hmm, it seems like living cells can be processed precisely as well. Do you need to refine the cancer cells that you are spreading out?

- Description from Novelupdates

Zheng Nianru went from being a Commandery Princess who could be killed at any moment to the position of the Empress Dowager, wielding power over the world. What she couldn't accept was that she didn't end up with a good fate. However, Zheng Nianru thought that no one would have been able to save Nanzheng State.Yet, she was reborn and, having deeply reflected upon her pain, also considered several past mistakes. Firstly, she should not have married down into the family of Ju Nanyi, a man with a narrow mind who came from a minor house, who only thought about romantic affairs and entangled with her in desperate affection, incapable of assisting Nanzheng. Secondly, she should not have killed everyone in Qiandao Temple, which was the spiritual pillar of the people of Nanzheng State. After all, there were better ways, weren't there, like seduction? Thirdly, she should not have been so confident that the monarch of the neighboring country would fall at her feet, nor should she have trusted the promise of that fickle neighboring monarch, which led to years of drawn-out conflict between the two states.Um, Zheng Nianru felt she was not wrong. She just wanted to live well and to be a good Empress Dowager. Since she had the chance to live again, why did she have this chance? Could it be that she was expected to once again turn Nanzheng State upside down?