Great Qin: From Couch Potato to Heir, I'm Going to Be Qin's Second Emperor

I transmigrated into the Qin Dynasty as Ying Yu, the eighth son of King Zheng of Qin, and activated a System. I’d planned to collect sign-in rewards and live the carefree life of an idle prince. But the System assigned me sign-in locations in the capitals of the Six Kingdoms. I went to Han, and Han was conquered. I went to Zhao, and Zhao fell. I arrived in Wei, and Wei was destroyed. I only went to sign in. How did these kingdoms all get wiped out, and how did the realm end up unified? Then the King of Qin died. Who could have guessed that Hu Hai would conspire with Li Si and Zhao Gao to alter the edict, sentence Fusu to death, and slaughter the other princes? I just wanted to be a lazy fish, but you’re trying to kill me. Damn it, I’m done being a lazy fish. I’m going to be the Second Emperor of Qin.