I've Lived for Two Thousand Years but I Can't Protect You.

At the end of the Warring States Period, Yun Chi, an orphan girl with the power of "watching death", could see the illusion of everyone's death moment. She trembled because she foresaw the end of the famous general Bai Qi committing suicide, but was taken in by Bai Qi. In the cavalry of the Qin Army, she met the idealistic young counselor Li Mu (not a real-name general in history, but a central character in the fiction). Yun Chi saw in horror that General Li Mu died in the fire to protect the people of a city at the last moment when Qin unified the world. She tried to reverse her fate, but it was like a mantis trying to use her arms as a cart. In the end, Li Mu died as predicted, while Yun Chi became a lonely observer of history, carrying this initial memory and regret for two thousand years.