I Will Help Su Become the Great Emperor

Modern engineer Zhang Tian traveled to the late Qin Dynasty and became a shrimp, which coincided with the death of Qin Shihuang and Zhao Gao's rise to power. Using modern knowledge as a weapon, he assisted his son Su to quell civil strife, resist the Xiongnu, and implement reforms, ultimately changing the fate of the Qin Dynasty. And all this is recorded as "I am in Da Qin", a historical manuscript left by a traveler.