Transmigrating as a Cannon-Fodder Female Character, I Help the Reborn Yandere Villain Rise to the Top

Mei Yunxiang transmigrates into a Mary Sue novel as an insignificant passerby. To make sure she stays alive, she decides to help the original story's gentle and refined leading man, who later turns into a dark villainous boss, unify the world and gain an aura of immortality.

The System shop sells all kinds of books, making it easy for Mei Yunxiang to become the top strategist under the villainous boss.

Smallpox strikes, and one vaccine saves the people of Nanliang.

Famine strikes, and sweet potatoes, potatoes, sorghum, and other crops solve the food shortage.

The enemy army invades. Watch me upgrade the bows and crossbows, make gunpowder and cannons, and drive back the enemy.

A cold wave hits. Heating beds and underfloor heating are child's play. Let's see if I can use my cheat to create an electrical system. That's the real way forward, preferably with natural power generation.

That might be a bit too ambitious. Mei Yunxiang feels like she may have dug herself into a hole.

But ancient times are so boring. It's unbearably dull not to research things.

Mei Yunxiang would never admit that her researcher nature had kicked in again.

But why is the Crown Prince looking at her so strangely?

Zhao Zhijun would never tell Yunxiang about the misery he suffered in his previous life: he trusted the wrong people, his lover betrayed him, his brothers stabbed him in the back, and the one brother who had truly cared for him was driven away by his own actions.

Yet the person who risked his life to save him in the end was the one he had wronged most.

Everyone says,