A modern scientific research youth accidentally time-travels and becomes Fusu, the eldest prince of Great Qin, imprisoned in the celestial dungeon for speaking out with frank admonitions. Relying on his modern knowledge to see through the hidden dangers of the alchemist's elixirs, he submits advice to Emperor Shi Huang to defuse the crisis. After gaining trust, he heads to Shangjun to take charge of the Great Wall garrison army, unites the Meng clan, and widely recruits talents. Internally, he improves people's livelihood, reduces corvée labor, and pacifies the common people; externally, he solidifies border defense to resist foreign tribes, steadily expanding the combat power of the Qin army. He sees through the treasonous plots of Zhao Gao and Li Si in advance, pacifies the treacherous officials in the court, implements new policies that benefit the country, and wholeheartedly repairs the ills of Great Qin to guard the long-term stability of the state.