Changping to the Early Han Dynasty: I Relied on Sima Guang to Survive Until the End

[Historical time travel, no system, no fantasy] Zhao Chuan, who finally became a quasi-college student, traveled back to the Northern Song Dynasty when his college life was about to begin. Nineteen years later, he stepped into the Warring States Period with Sima Guang's earnest teachings. From Changping to Xianyang, from the pile of dead people to the Qin Empire. How does a person who just wants to live and lie down get wrapped up in history and move forward?