Da Qin: Me! the Unparalleled Prince, Guarding the Great Wall for 18 Years

"My son Changying, go to the frontier immediately and guard the Great Wall. If you don't call, you will not return to Xianyang for the rest of your life!"
A decree, to send Ying Changying to the frontier, and not to return to Beijing until death!
I thought that I would die in the battle a few years later, but unexpectedly awakened the [Zhenguo System].
"Guard the Great Wall for one year, reward the dragon elephant with the strength of the prison!"
"Guard the Great Wall for three years, reward gentian with bright silver spear, long tassels in hand, dare to tie the blue dragon!"
"Guarding the Great Wall for five years, rewarding the Wei Army, Wu Mu's suicide note!"
……
Eighteen years later, the first emperor collapsed, the world was torn apart, and the nine states were all attacking Daqin!
Just when the various princes stepped on Xianyang and the building was about to fall, a silver gun was born, and the world changed color!