Da Qin: I, Ying Chengyu, Rewrite the Fate of the Country for Thousands of Years

Good guy, it's a dead end at the beginning, and it's still the luxury package of "you will be slaughtered after death". What's even worse is that it was not his enemies who forced him to rebel, but a group of relatives from his mother's side. Waiting to deal with him is his brother who will be the first emperor in the future, Ying Zheng. Why does this plot seem more and more like "That Time I Was Reincarnated as a Supporting Character Who Must Die" the more I watch it?