I Am a Military Attache and a Historian

Five countries, five boys, one oath. Ten years later, he is the only one left alive to fulfill his promise. Qin relied on "blood sacrifice" to destroy the six kingdoms - the more enemies it killed, the stronger its fighting power became. But Ying Zheng discovered that his mother used "heart sacrifice" - using emotions as fuel to control people's hearts. He unified the world with blood sacrifice, but became a person without emotions. He was a historian, recording every battle and writing the names of every dead person. He fulfilled the oath he made when he was a boy, and also fulfilled Han Fei's prophecy: "Of the five of you, only one will survive in the future."