Three Kingdoms: From the Start, I Jump Off a Cliff and Become Tong Yuan's Disciple

[The System appears only in Chapter Two, leaves behind Qin Qiong’s strength, then disappears] [Military generals] [The author isn’t good at plotting, so... thrilling battles all the way!!! Though there’ll be some of that early on] [Multiple heroines, lots of interaction] [Struggle for supremacy, starting in Hanzhong] Cui Xi accidentally transmigrates to the late Han dynasty and becomes a scoundrel. To avoid starving to death, he becomes a servant of the Zhen family of Wuji. But as someone with a modern education, he can’t stand living with such scarce resources, so he starts tinkering. He makes paper using cheaper materials and more advanced methods, then gets reported for using it as toilet paper! With no other choice, he has to give the paper-making method to the Zhen family. Fortunately, he gets paid. But that payment brings both good days and danger. For a while, he lives in luxury, and the Zhen family promises him their eldest daughter, Zhen Jiang, in marriage. But before long, the Zhen family throws him aside once he’s served his purpose. Driven to the edge of a cliff, he has no choice but to jump. The historical record says: “Emperor Wu once said: The greatest benefactor in my life was the Zhen family. When I was down and out, they kept me from starving in the streets; when I became arrogant, they gave me a sharp wake-up call; and when I was desperate, they brought me to my master.” At first, the protagonist wants to join Cao Cao, but as his power grows, he decides to fight for supremacy.